diff --git a/.zuul.yaml b/.zuul.yaml
index dfa9add..9c53ba9 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -180,6 +180,7 @@
         USE_PYTHON3: true
         FORCE_CONFIG_DRIVE: true
         ENABLE_VOLUME_MULTIATTACH: true
+        GLANCE_USE_IMPORT_WORKFLOW: True
       devstack_services:
         s-account: false
         s-container: false
@@ -270,6 +271,7 @@
         USE_PYTHON3: true
         FORCE_CONFIG_DRIVE: true
         ENABLE_VOLUME_MULTIATTACH: true
+        GLANCE_USE_IMPORT_WORKFLOW: True
 
 - job:
     name: tempest-integrated-object-storage
@@ -725,13 +727,11 @@
             irrelevant-files: *tempest-irrelevant-files
         - tempest-all:
             irrelevant-files: *tempest-irrelevant-files
-        - legacy-tempest-dsvm-neutron-dvr-multinode-full:
-            irrelevant-files: *tempest-irrelevant-files
         - neutron-tempest-dvr-ha-multinode-full:
             irrelevant-files: *tempest-irrelevant-files
         - nova-tempest-v2-api:
             irrelevant-files: *tempest-irrelevant-files
-        - legacy-tempest-dsvm-lvm-multibackend:
+        - cinder-tempest-lvm-multibackend:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-pg-full:
             irrelevant-files: *tempest-irrelevant-files
diff --git a/doc/source/conf.py b/doc/source/conf.py
index dd7c544..59a2f64 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -24,6 +24,7 @@
 
 import os
 import subprocess
+import sys
 
 # Build the plugin registry
 def build_plugin_registry(app):
@@ -31,16 +32,20 @@
         os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
     subprocess.call(['tools/generate-tempest-plugins-list.sh'], cwd=root_dir)
 
+def autodoc_skip_member_handler(app, what, name, obj, skip, options):
+    return skip or (what == "class" and not name.startswith("test"))
+
 def setup(app):
+    app.connect('autodoc-skip-member', autodoc_skip_member_handler)
     if os.getenv('GENERATE_TEMPEST_PLUGIN_LIST', 'true').lower() == 'true':
         app.connect('builder-inited', build_plugin_registry)
 
-
-
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.insert(0, os.path.abspath('.'))
+# sys.path.insert(0, os.path.abspath('.'))
+sys.path.insert(0, os.path.abspath('../../tempest'))
+sys.path.insert(0, os.path.abspath('../../tempest/api'))
 
 # -- General configuration -----------------------------------------------------
 
@@ -112,7 +117,7 @@
 show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # A list of ignored prefixes for module index sorting.
 modindex_common_prefix = ['tempest.']
@@ -205,5 +210,9 @@
      u'OpenStack Foundation', 'manual'),
 ]
 
-# Disable usage of xindy https://bugzilla.redhat.com/show_bug.cgi?id=1643664
 latex_use_xindy = False
+
+latex_elements = {
+    'maxlistdepth': 20,
+    'printindex': '\\footnotesize\\raggedright\\printindex'
+}
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index 36828e0..c43e420 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -193,10 +193,6 @@
 There are also options in the ``scenario`` section for images:
 
 #. ``img_file``
-#. ``img_dir``
-#. ``aki_img_file``
-#. ``ari_img_file``
-#. ``ami_img_file``
 #. ``img_container_format``
 #. ``img_disk_format``
 
@@ -205,13 +201,9 @@
 Tempest where an image file is located and describe its metadata for when it is
 uploaded.
 
-The behavior of these options is a bit convoluted (which will likely be fixed in
-future versions). You first need to specify ``img_dir``, which is the directory
-in which Tempest will look for the image files. First, it will check if the
-filename set for ``img_file`` could be found in ``img_dir``. If it is found then
-the ``img_container_format`` and ``img_disk_format`` options are used to upload
-that image to glance. However, if it is not found, Tempest will look for the
-three uec image file name options as a fallback. If neither is found, the tests
+You first need to specify full path of the image using ``img_file`` option.
+If it is found then the ``img_container_format`` and ``img_disk_format``
+options are used to upload that image to glance. If it's not found, the tests
 requiring an image to upload will fail.
 
 It is worth pointing out that using `cirros`_ is a very good choice for running
diff --git a/doc/source/index.rst b/doc/source/index.rst
index f878888..66e68ea 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -56,6 +56,13 @@
 
    supported_version
 
+Description of Tests
+--------------------
+.. toctree::
+   :maxdepth: 2
+
+   tests/modules
+
 For Contributors
 ================
 
@@ -80,6 +87,7 @@
    microversion_testing
    test_removal
    write_tests
+   requirement_upper_constraint_for_tempest
 
 Plugins
 -------
diff --git a/doc/source/plugins/plugin.rst b/doc/source/plugins/plugin.rst
index a9e2059..ab1b0b1 100644
--- a/doc/source/plugins/plugin.rst
+++ b/doc/source/plugins/plugin.rst
@@ -43,7 +43,7 @@
 In order to create the basic structure with base classes and test directories
 you can use the tempest-plugin-cookiecutter project::
 
-  > pip install -U cookiecutter && cookiecutter https://opendev.org/openstack/tempest-plugin-cookiecutter
+  > pip install -U cookiecutter && cookiecutter https://opendev.org/openstack/tempest-plugin-cookiecutter.git
 
   Cloning into 'tempest-plugin-cookiecutter'...
   remote: Counting objects: 17, done.
diff --git a/doc/source/requirement_upper_constraint_for_tempest.rst b/doc/source/requirement_upper_constraint_for_tempest.rst
new file mode 100644
index 0000000..2eebdda
--- /dev/null
+++ b/doc/source/requirement_upper_constraint_for_tempest.rst
@@ -0,0 +1,56 @@
+Requirements Upper Constraint for Tempest
+=========================================
+
+Tempest is branchless and supported stable branches use Tempest
+master and all EM stable branches use old compatible Tempest version
+for their testing. This means the OpenStack installed upper-constraints
+might not be compatible with Tempest used for stable branch testing.
+For example, if Tempest master is used for testing the stable/stein
+then stable/stein constraint might not be compatible with Tempest master so
+we need to use master upper-constraints there. That is why we use virtual
+env for Tempest installation and running tests so that we can control Tempest
+required constraint from system wide installed constraints.
+
+Devstack takes care of using the master upper-constraints when Tempest master
+is used. But when old Tempest is used then devstack alone cannot handle the
+compatible constraints because Tempest in-tree tox.ini also set the
+upper-constraints which are master constraints so if devstack set the different
+constraints than what we have in tox.ini we end up re-creation of venv which
+flush all previously installed tempest plugins in that venv. More details are
+on `this ML thread <http://lists.openstack.org/pipermail/openstack-discuss/2020-April/014388.html>`_
+
+To solve that problem we have two ways:
+
+#. Set UPPER_CONSTRAINTS_FILE to compatible constraint path
+   This option is not easy as it requires to set this env var everywhere
+   Tempest tox env is used like in devstack, grenade, projects side, zuulv3 roles etc.
+
+#. Pin upper-constraints in tox.ini
+   If we can pin the upper-constraints in tox.ini on every release with the branch
+   constraint at the time of release then we can solve it in an easy way because tox
+   can use the compatible constraint at the time of venv creation itself. But this can
+   again mismatch with the devstack set constraint so we need to follow the below process
+   to make it work.
+
+How to pin upper-constraints in tox.ini
+---------------------------------------
+
+This has to be done exactly before we cut the Tempest new major version bump
+release for the cycle.
+
+Step1: Add the pin constraint proposal in `QA office hour <https://wiki.openstack.org/wiki/Meetings/QATeamMeeting#Agenda_for_next_Office_hours>`_.
+       Pin constraint proposal includes:
+
+       - pin constraint patch. `Example patch 720578 <https://review.opendev.org/#/c/720578/>`_
+       - revert of pin constraint patch. `Example patch 721724 <https://review.opendev.org/#/c/721724/>`_
+
+Step2: Approve pin constraint and its revert patch together.
+       During office hour we need to check that there are no open patches for
+       Tempest release and accordingly we fast approve the 'pin constraint' and its
+       revert patch during office hour itself. Remember 'pin constraint patch' has to be
+       the last commit to include in Tempest release.
+
+Step3: Use 'pin constraint patch' hash for the Tempest new release.
+       By using the 'pin constraint patch' hash we make sure tox.ini in Tempest
+       released tag has the compatible stable constraint not the master one.
+       For Example `Tempest 24.0.0 <https://opendev.org/openstack/tempest/src/tag/24.0.0/tox.ini#L14>`_
diff --git a/doc/source/sampleconf.rst b/doc/source/sampleconf.rst
index c290140..45164a3 100644
--- a/doc/source/sampleconf.rst
+++ b/doc/source/sampleconf.rst
@@ -10,4 +10,6 @@
 
 The sample configuration can also be viewed in `file form <_static/tempest.conf.sample>`_.
 
-.. literalinclude:: _static/tempest.conf.sample
+.. only:: html
+
+   .. literalinclude:: _static/tempest.conf.sample
diff --git a/doc/source/tests/modules.rst b/doc/source/tests/modules.rst
new file mode 100644
index 0000000..026a7a5
--- /dev/null
+++ b/doc/source/tests/modules.rst
@@ -0,0 +1,21 @@
+Description of Tests
+====================
+
+OpenStack Services Integration Tests
+------------------------------------
+.. toctree::
+   :maxdepth: 2
+
+   scenario/modules
+
+OpenStack Services API Tests
+----------------------------
+.. toctree::
+   :maxdepth: 2
+
+   compute/modules
+   identity/modules
+   image/modules
+   network/modules
+   object_storage/modules
+   volume/modules
diff --git a/releasenotes/notes/25/subunt-describe-call-verbose-arg-fix.yaml b/releasenotes/notes/25/subunt-describe-call-verbose-arg-fix.yaml
new file mode 100644
index 0000000..d2a644e
--- /dev/null
+++ b/releasenotes/notes/25/subunt-describe-call-verbose-arg-fix.yaml
@@ -0,0 +1,10 @@
+---
+fixes:
+  - |
+    Fixed bug #1890060. tempest subunit_describe_calls --verbose not working with Cliff CLI.
+    The subunit_describe_calls --verbose argument was a boolean and worked in the non Cliff CLI
+    which is now deprecated, but does not work with cliff since --verbase is a standard cliff
+    argument which is an int.  Since the tool is in lib directory we cannot change the interface,
+    so we add a new argument -a --all-stdout that will allow cliff CLI to support the
+    feature in subunnit_describe_calls to print request and response headers and bodies
+    to stdout.
\ No newline at end of file
diff --git a/releasenotes/notes/Fix-KeyError-bug-in-v3-volumes_client-ff5d9b894f2257c8.yaml b/releasenotes/notes/Fix-KeyError-bug-in-v3-volumes_client-ff5d9b894f2257c8.yaml
new file mode 100644
index 0000000..bbb1901
--- /dev/null
+++ b/releasenotes/notes/Fix-KeyError-bug-in-v3-volumes_client-ff5d9b894f2257c8.yaml
@@ -0,0 +1,10 @@
+---
+fixes:
+  - |
+    is_resource_deleted method of v3 volumes_client might have returned
+    a KeyError exception due to an incorrect accessing of a volume id
+    in the case the volume was in error_deleting state.
+    incorrect code - volume['id']
+    correct code - volume['volume']['id']
+    More details about the issue can be found at
+    https://bugs.launchpad.net/tempest/+bug/1887980
diff --git a/releasenotes/notes/Remove-deprecated-image-scenario-options-b573c60e873ab451.yaml b/releasenotes/notes/Remove-deprecated-image-scenario-options-b573c60e873ab451.yaml
new file mode 100644
index 0000000..018d01d
--- /dev/null
+++ b/releasenotes/notes/Remove-deprecated-image-scenario-options-b573c60e873ab451.yaml
@@ -0,0 +1,15 @@
+---
+upgrade:
+  - |
+    The following deprecated image scenario options are removed after a ~4
+    year deprecation period.
+
+    * ``ami_img_file``
+    * ``ari_img_file``
+    * ``aki_img_file``
+
+    Starting Tempest 25.0.0 release, CONF.scenario.img_file need a full path
+    for the image. CONF.scenario.img_dir was deprecated and will be removed
+    in the next release. Till Tempest 25.0.0, old behavior is maintained and
+    keep working but starting Tempest 26.0.0, you need to specify the full path
+    in CONF.scenario.img_file config option.
diff --git a/releasenotes/notes/account-generator-accepts-positive-numbers-only-33a366a297494ef7.yaml b/releasenotes/notes/account-generator-accepts-positive-numbers-only-33a366a297494ef7.yaml
new file mode 100644
index 0000000..dfee1db
--- /dev/null
+++ b/releasenotes/notes/account-generator-accepts-positive-numbers-only-33a366a297494ef7.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+   Concurrency parameter for account-generator command was accepting
+   negative values and zero. The concurrency parameter now accepts only
+   positive numbers. When a negative value or zero is passed to the
+   program then the program ends and help is displayed.
diff --git a/releasenotes/notes/add-can-migrate-between-any-hosts-config-option-x8ah4f9737a28e9b.yaml b/releasenotes/notes/add-can-migrate-between-any-hosts-config-option-x8ah4f9737a28e9b.yaml
new file mode 100644
index 0000000..26fe01a
--- /dev/null
+++ b/releasenotes/notes/add-can-migrate-between-any-hosts-config-option-x8ah4f9737a28e9b.yaml
@@ -0,0 +1,9 @@
+---
+features:
+  - Add a new config option can_migrate_between_any_hosts in the
+    compute-feature-enabled section, which can be set to False for environment
+    with non homogeneous compute nodes, so that it can select a destination
+    host for migrating automatically, otherwise the testcase may fail
+    unexpectedly. e.g., if source host is with CPU "E5-2699 v4" and the
+    selected target host is with CPU "E5-2670 v3", the live-migration will
+    fail because of the downgrade issue.
diff --git a/releasenotes/notes/image_import_testing_support-22ba4bcb9f2fb848.yaml b/releasenotes/notes/image_import_testing_support-22ba4bcb9f2fb848.yaml
new file mode 100644
index 0000000..b0180cc
--- /dev/null
+++ b/releasenotes/notes/image_import_testing_support-22ba4bcb9f2fb848.yaml
@@ -0,0 +1,17 @@
+---
+features:
+  - |
+    Add glance image import APIs function to v2
+    images_client library.
+
+    * stage_image_file
+    * info_import
+    * info_stores
+    * image_import
+other:
+  - |
+    New configuration options
+    ``CONF.glance.image_feature_enabled.image_import`` has been introduced
+    to enable the image import tests. If your glance deployement support
+    image import functionality then you can enable the image import tests
+    via this flag. Default value of this new config option is false.
diff --git a/releasenotes/notes/network-swap-to-project_id-a1d7fdf6c5e1cf44.yaml b/releasenotes/notes/network-swap-to-project_id-a1d7fdf6c5e1cf44.yaml
new file mode 100644
index 0000000..4cf0c76
--- /dev/null
+++ b/releasenotes/notes/network-swap-to-project_id-a1d7fdf6c5e1cf44.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    [`blueprint blueprint adopt-oslo-versioned-objects-for-db <https://blueprints.launchpad.net/neutron/+spec/adopt-oslo-versioned-objects-for-db>`_]
+    Any reference to "tenant_id" in Network objects is replaced with
+    "project_id".
diff --git a/releasenotes/notes/xenapi_apis-conf-fcca549283e53ed6.yaml b/releasenotes/notes/xenapi_apis-conf-fcca549283e53ed6.yaml
new file mode 100644
index 0000000..4d26210
--- /dev/null
+++ b/releasenotes/notes/xenapi_apis-conf-fcca549283e53ed6.yaml
@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    A number of Compute APIs that only worked with the XenAPI virt driver have
+    been removed in the Compute service. As a result, their corresponding tests
+    are now disabled by default. They can be re-enabled using the new
+    ``[compute_feature_enabled] xenapi_apis`` config option.
diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index 71df749..9a9de43 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -98,7 +98,7 @@
 # show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # A list of ignored prefixes for module index sorting.
 # modindex_common_prefix = []
diff --git a/requirements.txt b/requirements.txt
index bf38fae..d8738f0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 cliff!=2.9.0,>=2.8.0 # Apache-2.0
-jsonschema>=2.6.0 # MIT
+jsonschema>=3.2.0 # MIT
 testtools>=2.2.0 # MIT
 paramiko>=2.0.0 # LGPLv2.1+
 netaddr>=0.7.18 # BSD
diff --git a/tempest/api/compute/admin/test_agents.py b/tempest/api/compute/admin/test_agents.py
index 0901374..4cc5fdd 100644
--- a/tempest/api/compute/admin/test_agents.py
+++ b/tempest/api/compute/admin/test_agents.py
@@ -13,12 +13,22 @@
 #    under the License.
 
 from tempest.api.compute import base
+from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
 
+CONF = config.CONF
 
+
+# TODO(stephenfin): Remove these tests once the nova Ussuri branch goes EOL
 class AgentsAdminTestJSON(base.BaseV2ComputeAdminTest):
-    """Tests Agents API"""
+    """Tests Compute Agents API"""
+
+    @classmethod
+    def skip_checks(cls):
+        super(AgentsAdminTestJSON, cls).skip_checks()
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise cls.skipException('The os-agents API is not supported.')
 
     @classmethod
     def setup_clients(cls):
@@ -46,7 +56,7 @@
 
     @decorators.idempotent_id('1fc6bdc8-0b6d-4cc7-9f30-9b04fabe5b90')
     def test_create_agent(self):
-        # Create an agent.
+        """Test creating a compute agent"""
         params = self._param_helper(
             hypervisor='kvm', os='win', architecture='x86',
             version='7.0', url='xxx://xxxx/xxx/xxx',
@@ -58,6 +68,7 @@
 
     @decorators.idempotent_id('dc9ffd51-1c50-4f0e-a820-ae6d2a568a9e')
     def test_update_agent(self):
+        """Test updating a compute agent"""
         # Create and update an agent.
         body = self.client.create_agent(**self.params_agent)['agent']
         self.addCleanup(self.client.delete_agent, body['agent_id'])
@@ -71,7 +82,7 @@
 
     @decorators.idempotent_id('470e0b89-386f-407b-91fd-819737d0b335')
     def test_delete_agent(self):
-        # Create an agent and delete it.
+        """Test deleting a compute agent"""
         body = self.client.create_agent(**self.params_agent)['agent']
         self.client.delete_agent(body['agent_id'])
 
@@ -82,7 +93,7 @@
 
     @decorators.idempotent_id('6a326c69-654b-438a-80a3-34bcc454e138')
     def test_list_agents(self):
-        # Create an agent and  list all agents.
+        """Test listing compute agents"""
         body = self.client.create_agent(**self.params_agent)['agent']
         self.addCleanup(self.client.delete_agent, body['agent_id'])
         agents = self.client.list_agents()['agents']
@@ -91,7 +102,7 @@
 
     @decorators.idempotent_id('eabadde4-3cd7-4ec4-a4b5-5a936d2d4408')
     def test_list_agents_with_filter(self):
-        # Create agents and list the agent builds by the filter.
+        """Test listing compute agents by the filter"""
         body = self.client.create_agent(**self.params_agent)['agent']
         self.addCleanup(self.client.delete_agent, body['agent_id'])
         params = self._param_helper(
diff --git a/tempest/api/compute/admin/test_aggregates.py b/tempest/api/compute/admin/test_aggregates.py
index 7a3bfdf..2716259 100644
--- a/tempest/api/compute/admin/test_aggregates.py
+++ b/tempest/api/compute/admin/test_aggregates.py
@@ -71,10 +71,11 @@
 
 
 class AggregatesAdminTestJSON(AggregatesAdminTestBase):
+    """Tests Aggregates API that require admin privileges"""
 
     @decorators.idempotent_id('0d148aa3-d54c-4317-aa8d-42040a475e20')
     def test_aggregate_create_delete(self):
-        # Create and delete an aggregate.
+        """Test create/delete aggregate"""
         aggregate = self._create_test_aggregate()
         self.assertIsNone(aggregate['availability_zone'])
 
@@ -83,7 +84,7 @@
 
     @decorators.idempotent_id('5873a6f8-671a-43ff-8838-7ce430bb6d0b')
     def test_aggregate_create_delete_with_az(self):
-        # Create and delete an aggregate.
+        """Test create/delete aggregate with availability_zone"""
         az_name = data_utils.rand_name(self.az_name_prefix)
         aggregate = self._create_test_aggregate(availability_zone=az_name)
         self.assertEqual(az_name, aggregate['availability_zone'])
@@ -93,7 +94,7 @@
 
     @decorators.idempotent_id('68089c38-04b1-4758-bdf0-cf0daec4defd')
     def test_aggregate_create_verify_entry_in_list(self):
-        # Create an aggregate and ensure it is listed.
+        """Test listing aggregate should contain the created aggregate"""
         aggregate = self._create_test_aggregate()
         aggregates = self.client.list_aggregates()['aggregates']
         self.assertIn((aggregate['id'], aggregate['availability_zone']),
@@ -102,7 +103,7 @@
 
     @decorators.idempotent_id('36ec92ca-7a73-43bc-b920-7531809e8540')
     def test_aggregate_create_update_metadata_get_details(self):
-        # Create an aggregate and ensure its details are returned.
+        """Test set/get aggregate metadata"""
         aggregate = self._create_test_aggregate()
         body = self.client.show_aggregate(aggregate['id'])['aggregate']
         self.assertEqual(aggregate['name'], body['name'])
@@ -121,7 +122,7 @@
 
     @decorators.idempotent_id('4d2b2004-40fa-40a1-aab2-66f4dab81beb')
     def test_aggregate_create_update_with_az(self):
-        # Update an aggregate and ensure properties are updated correctly
+        """Test create/update aggregate with availability_zone"""
         aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
         az_name = data_utils.rand_name(self.az_name_prefix)
         aggregate = self._create_test_aggregate(
@@ -148,7 +149,7 @@
 
     @decorators.idempotent_id('c8e85064-e79b-4906-9931-c11c24294d02')
     def test_aggregate_add_remove_host(self):
-        # Add a host to the given aggregate and remove.
+        """Test adding host to and removing host from aggregate"""
         self.useFixture(fixtures.LockFixture('availability_zone'))
         aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
         aggregate = self._create_test_aggregate(name=aggregate_name)
@@ -169,7 +170,10 @@
 
     @decorators.idempotent_id('7f6a1cc5-2446-4cdb-9baa-b6ae0a919b72')
     def test_aggregate_add_host_list(self):
-        # Add a host to the given aggregate and list.
+        """Test listing aggregate contains the host added to the aggregate
+
+        Add a host to the given aggregate and list.
+        """
         self.useFixture(fixtures.LockFixture('availability_zone'))
         aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
         aggregate = self._create_test_aggregate(name=aggregate_name)
@@ -188,7 +192,10 @@
 
     @decorators.idempotent_id('eeef473c-7c52-494d-9f09-2ed7fc8fc036')
     def test_aggregate_add_host_get_details(self):
-        # Add a host to the given aggregate and get details.
+        """Test showing aggregate contains the host added to the aggregate
+
+        Add a host to the given aggregate and get details.
+        """
         self.useFixture(fixtures.LockFixture('availability_zone'))
         aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
         aggregate = self._create_test_aggregate(name=aggregate_name)
@@ -204,7 +211,7 @@
 
     @decorators.idempotent_id('96be03c7-570d-409c-90f8-e4db3c646996')
     def test_aggregate_add_host_create_server_with_az(self):
-        # Add a host to the given aggregate and create a server.
+        """Test adding a host to the given aggregate and creating a server"""
         self.useFixture(fixtures.LockFixture('availability_zone'))
         az_name = data_utils.rand_name(self.az_name_prefix)
         aggregate = self._create_test_aggregate(availability_zone=az_name)
@@ -233,6 +240,11 @@
 
 
 class AggregatesAdminTestV241(AggregatesAdminTestBase):
+    """Tests Aggregates API that require admin privileges
+
+    Tests Aggregates API that require admin privileges with compute
+    microversion greater than 2.40.
+    """
     min_microversion = '2.41'
 
     # NOTE(gmann): This test tests the Aggregate APIs response schema
@@ -241,6 +253,11 @@
 
     @decorators.idempotent_id('fdf24d9e-8afa-4700-b6aa-9c498351504f')
     def test_create_update_show_aggregate_add_remove_host(self):
+        """Test response schema of aggregates API
+
+        Test response schema of aggregates API(create/update/show/add host/
+        remove host) with compute microversion greater than 2.40.
+        """
         # Update and add a host to the given aggregate and get details.
         self.useFixture(fixtures.LockFixture('availability_zone'))
         # Checking create aggregate API response schema
diff --git a/tempest/api/compute/admin/test_aggregates_negative.py b/tempest/api/compute/admin/test_aggregates_negative.py
index d5adfed..7b115ce 100644
--- a/tempest/api/compute/admin/test_aggregates_negative.py
+++ b/tempest/api/compute/admin/test_aggregates_negative.py
@@ -49,7 +49,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('86a1cb14-da37-4a70-b056-903fd56dfe29')
     def test_aggregate_create_as_user(self):
-        # Regular user is not allowed to create an aggregate.
+        """Regular user is not allowed to create an aggregate"""
         aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
         self.assertRaises(lib_exc.Forbidden,
                           self.aggregates_client.create_aggregate,
@@ -58,7 +58,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('3b8a1929-3793-4e92-bcb4-dfa572ee6c1d')
     def test_aggregate_create_aggregate_name_length_less_than_1(self):
-        # the length of aggregate name should >= 1 and <=255
+        """The length of aggregate name should >=1"""
         self.assertRaises(lib_exc.BadRequest,
                           self.client.create_aggregate,
                           name='')
@@ -66,7 +66,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('4c194563-543b-4e70-a719-557bbe947fac')
     def test_aggregate_create_aggregate_name_length_exceeds_255(self):
-        # the length of aggregate name should >= 1 and <=255
+        """The length of aggregate name should <=255"""
         aggregate_name = 'a' * 256
         self.assertRaises(lib_exc.BadRequest,
                           self.client.create_aggregate,
@@ -75,7 +75,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9c23a291-b0b1-487b-b464-132e061151b3')
     def test_aggregate_create_with_existent_aggregate_name(self):
-        # creating an aggregate with existent aggregate name is forbidden
+        """Creating an aggregate with existent aggregate name is forbidden"""
         aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.Conflict,
                           self.client.create_aggregate,
@@ -84,7 +84,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('cd6de795-c15d-45f1-8d9e-813c6bb72a3d')
     def test_aggregate_delete_as_user(self):
-        # Regular user is not allowed to delete an aggregate.
+        """Regular user is not allowed to delete an aggregate"""
         aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.Forbidden,
                           self.aggregates_client.delete_aggregate,
@@ -93,14 +93,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b7d475a6-5dcd-4ff4-b70a-cd9de66a6672')
     def test_aggregate_list_as_user(self):
-        # Regular user is not allowed to list aggregates.
+        """Regular user is not allowed to list aggregates"""
         self.assertRaises(lib_exc.Forbidden,
                           self.aggregates_client.list_aggregates)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('557cad12-34c9-4ff4-95f0-22f0dfbaf7dc')
     def test_aggregate_get_details_as_user(self):
-        # Regular user is not allowed to get aggregate details.
+        """Regular user is not allowed to get aggregate details"""
         aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.Forbidden,
                           self.aggregates_client.show_aggregate,
@@ -109,21 +109,21 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c74f4bf1-4708-4ff2-95a0-f49eaca951bd')
     def test_aggregate_delete_with_invalid_id(self):
-        # Delete an aggregate with invalid id should raise exceptions.
+        """Delete an aggregate with invalid id should raise exceptions"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.delete_aggregate, -1)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('3c916244-2c46-49a4-9b55-b20bb0ae512c')
     def test_aggregate_get_details_with_invalid_id(self):
-        # Get aggregate details with invalid id should raise exceptions.
+        """Get aggregate details with invalid id should raise exceptions"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.show_aggregate, -1)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0ef07828-12b4-45ba-87cc-41425faf5711')
     def test_aggregate_add_non_exist_host(self):
-        # Adding a non-exist host to an aggregate should raise exceptions.
+        """Adding a non-exist host to an aggregate should fail"""
         while True:
             non_exist_host = data_utils.rand_name('nonexist_host')
             if non_exist_host not in self.hosts:
@@ -135,7 +135,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7324c334-bd13-4c93-8521-5877322c3d51')
     def test_aggregate_add_host_as_user(self):
-        # Regular user is not allowed to add a host to an aggregate.
+        """Regular user is not allowed to add a host to an aggregate"""
         aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.Forbidden,
                           self.aggregates_client.add_host,
@@ -144,7 +144,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('19dd44e1-c435-4ee1-a402-88c4f90b5950')
     def test_aggregate_add_existent_host(self):
-        # Adding already existing host to aggregate should fail.
+        """Adding already existing host to aggregate should fail"""
         self.useFixture(fixtures.LockFixture('availability_zone'))
         aggregate = self._create_test_aggregate()
 
@@ -158,7 +158,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7a53af20-137a-4e44-a4ae-e19260e626d9')
     def test_aggregate_remove_host_as_user(self):
-        # Regular user is not allowed to remove a host from an aggregate.
+        """Regular user is not allowed to remove a host from an aggregate"""
         self.useFixture(fixtures.LockFixture('availability_zone'))
         aggregate = self._create_test_aggregate()
 
@@ -173,7 +173,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('95d6a6fa-8da9-4426-84d0-eec0329f2e4d')
     def test_aggregate_remove_nonexistent_host(self):
-        # Removing not existing host from aggregate should fail.
+        """Removing not existing host from aggregate should fail"""
         aggregate = self._create_test_aggregate()
 
         self.assertRaises(lib_exc.NotFound, self.client.remove_host,
diff --git a/tempest/api/compute/admin/test_availability_zone.py b/tempest/api/compute/admin/test_availability_zone.py
index bbd39b6..3eb0d9a 100644
--- a/tempest/api/compute/admin/test_availability_zone.py
+++ b/tempest/api/compute/admin/test_availability_zone.py
@@ -27,12 +27,12 @@
 
     @decorators.idempotent_id('d3431479-8a09-4f76-aa2d-26dc580cb27c')
     def test_get_availability_zone_list(self):
-        # List of availability zone
+        """Test listing availability zones"""
         availability_zone = self.client.list_availability_zones()
         self.assertNotEmpty(availability_zone['availabilityZoneInfo'])
 
     @decorators.idempotent_id('ef726c58-530f-44c2-968c-c7bed22d5b8c')
     def test_get_availability_zone_list_detail(self):
-        # List of availability zones and available services
+        """Test listing availability zones with detail"""
         availability_zone = self.client.list_availability_zones(detail=True)
         self.assertNotEmpty(availability_zone['availabilityZoneInfo'])
diff --git a/tempest/api/compute/admin/test_availability_zone_negative.py b/tempest/api/compute/admin/test_availability_zone_negative.py
index a58c22c..6e576e8 100644
--- a/tempest/api/compute/admin/test_availability_zone_negative.py
+++ b/tempest/api/compute/admin/test_availability_zone_negative.py
@@ -18,7 +18,7 @@
 
 
 class AZAdminNegativeTestJSON(base.BaseV2ComputeAdminTest):
-    """Tests Availability Zone API List"""
+    """Negative Tests of Availability Zone API List"""
 
     @classmethod
     def setup_clients(cls):
@@ -28,8 +28,12 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('bf34dca2-fdc3-4073-9c02-7648d9eae0d7')
     def test_get_availability_zone_list_detail_with_non_admin_user(self):
-        # List of availability zones and available services with
-        # non-administrator user
+        """Test listing availability zone with detail by non-admin user
+
+        List of availability zones and available services with
+        non-administrator user is not allowed.
+        """
+
         self.assertRaises(
             lib_exc.Forbidden,
             self.non_adm_client.list_availability_zones, detail=True)
diff --git a/tempest/api/compute/admin/test_create_server.py b/tempest/api/compute/admin/test_create_server.py
index 711b441..c4a8bf5 100644
--- a/tempest/api/compute/admin/test_create_server.py
+++ b/tempest/api/compute/admin/test_create_server.py
@@ -27,6 +27,8 @@
 
 
 class ServersWithSpecificFlavorTestJSON(base.BaseV2ComputeAdminTest):
+    """Test creating servers with specific flavor"""
+
     @classmethod
     def setup_credentials(cls):
         cls.prepare_instance_network()
@@ -41,7 +43,7 @@
     @testtools.skipUnless(CONF.validation.run_validation,
                           'Instance validation tests are disabled.')
     def test_verify_created_server_ephemeral_disk(self):
-        # Verify that the ephemeral disk is created when creating server
+        """Verify that the ephemeral disk is created when creating server"""
         flavor_base = self.flavors_client.show_flavor(
             self.flavor_ref)['flavor']
 
diff --git a/tempest/api/compute/admin/test_delete_server.py b/tempest/api/compute/admin/test_delete_server.py
index 58cac57..c625939 100644
--- a/tempest/api/compute/admin/test_delete_server.py
+++ b/tempest/api/compute/admin/test_delete_server.py
@@ -19,6 +19,8 @@
 
 
 class DeleteServersAdminTestJSON(base.BaseV2ComputeAdminTest):
+    """Test deletion of servers"""
+
     # NOTE: Server creations of each test class should be under 10
     # for preventing "Quota exceeded for instances".
 
@@ -30,7 +32,7 @@
 
     @decorators.idempotent_id('99774678-e072-49d1-9d2a-49a59bc56063')
     def test_delete_server_while_in_error_state(self):
-        # Delete a server while it's VM state is error
+        """Delete a server while it's VM state is error"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.admin_client.reset_state(server['id'], state='error')
         # Verify server's state
@@ -43,7 +45,7 @@
 
     @decorators.idempotent_id('73177903-6737-4f27-a60c-379e8ae8cf48')
     def test_admin_delete_servers_of_others(self):
-        # Administrator can delete servers of others
+        """Administrator can delete servers of others"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.admin_client.delete_server(server['id'])
         waiters.wait_for_server_termination(self.servers_client, server['id'])
diff --git a/tempest/api/compute/admin/test_fixed_ips.py b/tempest/api/compute/admin/test_fixed_ips.py
index 66c2c2d..9de3da9 100644
--- a/tempest/api/compute/admin/test_fixed_ips.py
+++ b/tempest/api/compute/admin/test_fixed_ips.py
@@ -22,6 +22,7 @@
 
 
 class FixedIPsTestJson(base.BaseV2ComputeAdminTest):
+    """Test fixed ips API"""
 
     @classmethod
     def skip_checks(cls):
@@ -56,13 +57,16 @@
 
     @decorators.idempotent_id('16b7d848-2f7c-4709-85a3-2dfb4576cc52')
     def test_list_fixed_ip_details(self):
+        """Test getting fixed ip details"""
         fixed_ip = self.client.show_fixed_ip(self.ip)
         self.assertEqual(fixed_ip['fixed_ip']['address'], self.ip)
 
     @decorators.idempotent_id('5485077b-7e46-4cec-b402-91dc3173433b')
     def test_set_reserve(self):
+        """Test reserving fixed ip"""
         self.client.reserve_fixed_ip(self.ip, reserve="None")
 
     @decorators.idempotent_id('7476e322-b9ff-4710-bf82-49d51bac6e2e')
     def test_set_unreserve(self):
+        """Test unreserving fixed ip"""
         self.client.reserve_fixed_ip(self.ip, unreserve="None")
diff --git a/tempest/api/compute/admin/test_fixed_ips_negative.py b/tempest/api/compute/admin/test_fixed_ips_negative.py
index 7d41f46..1629faa 100644
--- a/tempest/api/compute/admin/test_fixed_ips_negative.py
+++ b/tempest/api/compute/admin/test_fixed_ips_negative.py
@@ -22,6 +22,7 @@
 
 
 class FixedIPsNegativeTestJson(base.BaseV2ComputeAdminTest):
+    """Negative tests of fixed ips API"""
 
     @classmethod
     def skip_checks(cls):
@@ -58,12 +59,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9f17f47d-daad-4adc-986e-12370c93e407')
     def test_list_fixed_ip_details_with_non_admin_user(self):
+        """Test listing fixed ip with detail by non-admin user is forbidden"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.show_fixed_ip, self.ip)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ce60042c-fa60-4836-8d43-1c8e3359dc47')
     def test_set_reserve_with_non_admin_user(self):
+        """Test reserving fixed ip by non-admin user is forbidden"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.reserve_fixed_ip,
                           self.ip, reserve="None")
@@ -71,6 +74,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f1f7a35b-0390-48c5-9803-5f27461439db')
     def test_set_unreserve_with_non_admin_user(self):
+        """Test unreserving fixed ip by non-admin user is forbidden"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.reserve_fixed_ip,
                           self.ip, unreserve="None")
@@ -78,6 +82,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f51cf464-7fc5-4352-bc3e-e75cfa2cb717')
     def test_set_reserve_with_invalid_ip(self):
+        """Test reserving invalid fixed ip should fail"""
         # NOTE(maurosr): since this exercises the same code snippet, we do it
         # only for reserve action
         # NOTE(eliqiao): in Juno, the exception is NotFound, but in master, we
@@ -90,6 +95,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('fd26ef50-f135-4232-9d32-281aab3f9176')
     def test_fixed_ip_with_invalid_action(self):
+        """Test operating fixed ip with invalid action should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.client.reserve_fixed_ip,
                           self.ip, invalid_action="None")
diff --git a/tempest/api/compute/admin/test_flavors_access.py b/tempest/api/compute/admin/test_flavors_access.py
index b8e2b42..87ab7c7 100644
--- a/tempest/api/compute/admin/test_flavors_access.py
+++ b/tempest/api/compute/admin/test_flavors_access.py
@@ -43,8 +43,12 @@
 
     @decorators.idempotent_id('ea2c2211-29fa-4db9-97c3-906d36fad3e0')
     def test_flavor_access_list_with_private_flavor(self):
-        # Test to make sure that list flavor access on a newly created
-        # private flavor will return an empty access list
+        """Test listing flavor access for a private flavor
+
+        Listing flavor access on a newly created private flavor will return
+        an empty access list.
+        """
+        # Test to make sure that
         flavor = self.create_flavor(ram=self.ram, vcpus=self.vcpus,
                                     disk=self.disk, is_public='False')
 
@@ -54,7 +58,7 @@
 
     @decorators.idempotent_id('59e622f6-bdf6-45e3-8ba8-fedad905a6b4')
     def test_flavor_access_add_remove(self):
-        # Test to add and remove flavor access to a given tenant.
+        """Test add/remove flavor access to a given project"""
         flavor = self.create_flavor(ram=self.ram, vcpus=self.vcpus,
                                     disk=self.disk, is_public='False')
 
diff --git a/tempest/api/compute/admin/test_flavors_access_negative.py b/tempest/api/compute/admin/test_flavors_access_negative.py
index 45ca10a..ac09cb0 100644
--- a/tempest/api/compute/admin/test_flavors_access_negative.py
+++ b/tempest/api/compute/admin/test_flavors_access_negative.py
@@ -46,7 +46,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0621c53e-d45d-40e7-951d-43e5e257b272')
     def test_flavor_access_list_with_public_flavor(self):
-        # Test to list flavor access with exceptions by querying public flavor
+        """Test listing flavor access of a public flavor should fail"""
         flavor = self.create_flavor(ram=self.ram, vcpus=self.vcpus,
                                     disk=self.disk, is_public='True')
         self.assertRaises(lib_exc.NotFound,
@@ -56,7 +56,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('41eaaade-6d37-4f28-9c74-f21b46ca67bd')
     def test_flavor_non_admin_add(self):
-        # Test to add flavor access as a user without admin privileges.
+        """Test adding flavor access by a non-admin user is forbidden"""
         flavor = self.create_flavor(ram=self.ram, vcpus=self.vcpus,
                                     disk=self.disk, is_public='False')
         self.assertRaises(lib_exc.Forbidden,
@@ -67,7 +67,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('073e79a6-c311-4525-82dc-6083d919cb3a')
     def test_flavor_non_admin_remove(self):
-        # Test to remove flavor access as a user without admin privileges.
+        """Test removing flavor access by a non-admin user should fail"""
         flavor = self.create_flavor(ram=self.ram, vcpus=self.vcpus,
                                     disk=self.disk, is_public='False')
 
@@ -84,6 +84,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f3592cc0-0306-483c-b210-9a7b5346eddc')
     def test_add_flavor_access_duplicate(self):
+        """Test adding duplicate flavor access to same flavor should fail"""
         # Create a new flavor.
         flavor = self.create_flavor(ram=self.ram, vcpus=self.vcpus,
                                     disk=self.disk, is_public='False')
@@ -104,6 +105,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1f710927-3bc7-4381-9f82-0ca6e42644b7')
     def test_remove_flavor_access_not_found(self):
+        """Test removing non existent flavor access should fail"""
         # Create a new flavor.
         flavor = self.create_flavor(ram=self.ram, vcpus=self.vcpus,
                                     disk=self.disk, is_public='False')
diff --git a/tempest/api/compute/admin/test_flavors_microversions.py b/tempest/api/compute/admin/test_flavors_microversions.py
index 31b9217..d904cbd 100644
--- a/tempest/api/compute/admin/test_flavors_microversions.py
+++ b/tempest/api/compute/admin/test_flavors_microversions.py
@@ -18,6 +18,8 @@
 
 
 class FlavorsV255TestJSON(base.BaseV2ComputeAdminTest):
+    """Test flavors API with compute microversion greater than 2.54"""
+
     min_microversion = '2.55'
     max_microversion = 'latest'
 
@@ -26,6 +28,11 @@
 
     @decorators.idempotent_id('61976b25-488d-41dc-9dcb-cb9693a7b075')
     def test_crud_flavor(self):
+        """Test create/show/update/list flavor
+
+        Check the response schema of flavors API with microversion greater
+        than 2.54.
+        """
         flavor_id = data_utils.rand_int_id(start=1000)
         # Checking create API response schema
         new_flavor_id = self.create_flavor(ram=512,
@@ -44,6 +51,7 @@
 
 
 class FlavorsV261TestJSON(FlavorsV255TestJSON):
+    """Test flavors API with compute microversion greater than 2.60"""
     min_microversion = '2.61'
     max_microversion = 'latest'
 
diff --git a/tempest/api/compute/admin/test_floating_ips_bulk.py b/tempest/api/compute/admin/test_floating_ips_bulk.py
index 2d7e1a7..786c7f0 100644
--- a/tempest/api/compute/admin/test_floating_ips_bulk.py
+++ b/tempest/api/compute/admin/test_floating_ips_bulk.py
@@ -63,7 +63,7 @@
     @decorators.idempotent_id('2c8f145f-8012-4cb8-ac7e-95a587f0e4ab')
     @utils.services('network')
     def test_create_list_delete_floating_ips_bulk(self):
-        # Create, List  and delete the Floating IPs Bulk
+        """Creating, listing and deleting the Floating IPs Bulk"""
         pool = 'test_pool'
         # NOTE(GMann): Reserving the IP range but those are not attached
         # anywhere. Using the below mentioned interface which is not ever
diff --git a/tempest/api/compute/admin/test_hosts.py b/tempest/api/compute/admin/test_hosts.py
index 31fe2b5..30f3388 100644
--- a/tempest/api/compute/admin/test_hosts.py
+++ b/tempest/api/compute/admin/test_hosts.py
@@ -18,7 +18,7 @@
 
 
 class HostsAdminTestJSON(base.BaseV2ComputeAdminTest):
-    """Tests hosts API using admin privileges."""
+    """Tests nova hosts API using admin privileges."""
 
     max_microversion = '2.42'
 
@@ -29,13 +29,13 @@
 
     @decorators.idempotent_id('9bfaf98d-e2cb-44b0-a07e-2558b2821e4f')
     def test_list_hosts(self):
-        # Listing hosts.
+        """Listing nova hosts"""
         hosts = self.client.list_hosts()['hosts']
         self.assertGreaterEqual(len(hosts), 2, str(hosts))
 
     @decorators.idempotent_id('5dc06f5b-d887-47a2-bb2a-67762ef3c6de')
     def test_list_hosts_with_zone(self):
-        # Listing hosts with specified availability zone
+        """Listing nova hosts with specified availability zone"""
         self.useFixture(fixtures.LockFixture('availability_zone'))
         hosts = self.client.list_hosts()['hosts']
         host = hosts[0]
@@ -45,23 +45,27 @@
 
     @decorators.idempotent_id('9af3c171-fbf4-4150-a624-22109733c2a6')
     def test_list_hosts_with_a_blank_zone(self):
-        # Listing hosts with blank availability zone.
-        # If send the request with a blank zone, the request will be successful
-        # and it will return all the hosts list
+        """Listing nova hosts with blank availability zone
+
+        If send the request with a blank zone, the request will be successful
+        and it will return all the hosts list
+        """
         hosts = self.client.list_hosts(zone='')['hosts']
         self.assertNotEmpty(hosts)
 
     @decorators.idempotent_id('c6ddbadb-c94e-4500-b12f-8ffc43843ff8')
     def test_list_hosts_with_nonexistent_zone(self):
-        # Listing hosts with not existing availability zone.
-        # If send the request with a nonexistent zone, the request will be
-        # successful and no hosts will be returned
+        """Listing nova hosts with not existing availability zone.
+
+        If send the request with a nonexistent zone, the request will be
+        successful and no hosts will be returned
+        """
         hosts = self.client.list_hosts(zone='xxx')['hosts']
         self.assertEmpty(hosts)
 
     @decorators.idempotent_id('38adbb12-aee2-4498-8aec-329c72423aa4')
     def test_show_host_detail(self):
-        # Showing host details.
+        """Showing nova host details"""
         hosts = self.client.list_hosts()['hosts']
 
         hosts = [host for host in hosts if host['service'] == 'compute']
diff --git a/tempest/api/compute/admin/test_hosts_negative.py b/tempest/api/compute/admin/test_hosts_negative.py
index e8733c8..e9436bc 100644
--- a/tempest/api/compute/admin/test_hosts_negative.py
+++ b/tempest/api/compute/admin/test_hosts_negative.py
@@ -39,21 +39,21 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('dd032027-0210-4d9c-860e-69b1b8deed5f')
     def test_list_hosts_with_non_admin_user(self):
-        # Non admin user is not allowed to list hosts.
+        """Non admin user is not allowed to list hosts"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.list_hosts)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e75b0a1a-041f-47a1-8b4a-b72a6ff36d3f')
     def test_show_host_detail_with_nonexistent_hostname(self):
-        # Showing host detail with not existing hostname should fail.
+        """Showing host detail with not existing hostname should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.show_host, 'nonexistent_hostname')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('19ebe09c-bfd4-4b7c-81a2-e2e0710f59cc')
     def test_show_host_detail_with_non_admin_user(self):
-        # Non admin user is not allowed to show host details.
+        """Non admin user is not allowed to show host details"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.show_host,
                           self.hostname)
@@ -61,7 +61,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e40c72b1-0239-4ed6-ba21-81a184df1f7c')
     def test_update_host_with_non_admin_user(self):
-        # Non admin user is not allowed to update host.
+        """Non admin user is not allowed to update host"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.update_host,
                           self.hostname,
@@ -71,8 +71,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('fbe2bf3e-3246-4a95-a59f-94e4e298ec77')
     def test_update_host_with_invalid_status(self):
-        # Updating host to invalid status should fail,
-        # 'status' can only be 'enable' or 'disable'.
+        """Updating host to invalid status should fail
+
+        'status' can only be 'enable' or 'disable'.
+        """
         self.assertRaises(lib_exc.BadRequest,
                           self.client.update_host,
                           self.hostname,
@@ -82,8 +84,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ab1e230e-5e22-41a9-8699-82b9947915d4')
     def test_update_host_with_invalid_maintenance_mode(self):
-        # Updating host to invalid maintenance mode should fail,
-        # 'maintenance_mode' can only be 'enable' or 'disable'.
+        """Updating host to invalid maintenance mode should fail
+
+        'maintenance_mode' can only be 'enable' or 'disable'.
+        """
         self.assertRaises(lib_exc.BadRequest,
                           self.client.update_host,
                           self.hostname,
@@ -93,8 +97,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0cd85f75-6992-4a4a-b1bd-d11e37fd0eee')
     def test_update_host_without_param(self):
-        # Updating host without param should fail,
-        # 'status' or 'maintenance_mode' is needed for host update.
+        """Updating host without param should fail
+
+        'status' or 'maintenance_mode' is needed for host update
+        """
         self.assertRaises(lib_exc.BadRequest,
                           self.client.update_host,
                           self.hostname)
@@ -102,7 +108,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('23c92146-2100-4d68-b2d6-c7ade970c9c1')
     def test_update_nonexistent_host(self):
-        # Updating not existing host should fail.
+        """Updating not existing host should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.update_host,
                           'nonexistent_hostname',
@@ -112,7 +118,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0d981ac3-4320-4898-b674-82b61fbb60e4')
     def test_startup_nonexistent_host(self):
-        # Starting up not existing host should fail.
+        """Starting up not existing host should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.startup_host,
                           'nonexistent_hostname')
@@ -120,7 +126,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9f4ebb7e-b2ae-4e5b-a38f-0fd1bb0ddfca')
     def test_startup_host_with_non_admin_user(self):
-        # Non admin user is not allowed to startup host.
+        """Non admin user is not allowed to startup host"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.startup_host,
                           self.hostname)
@@ -128,7 +134,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9e637444-29cf-4244-88c8-831ae82c31b6')
     def test_shutdown_nonexistent_host(self):
-        # Shutting down not existing host should fail.
+        """Shutting down not existing host should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.shutdown_host,
                           'nonexistent_hostname')
@@ -136,7 +142,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a803529c-7e3f-4d3c-a7d6-8e1c203d27f6')
     def test_shutdown_host_with_non_admin_user(self):
-        # Non admin user is not allowed to shutdown host.
+        """Non admin user is not allowed to shutdown host"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.shutdown_host,
                           self.hostname)
@@ -144,7 +150,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f86bfd7b-0b13-4849-ae29-0322e83ee58b')
     def test_reboot_nonexistent_host(self):
-        # Rebooting not existing host should fail.
+        """Rebooting not existing host should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.reboot_host,
                           'nonexistent_hostname')
@@ -152,7 +158,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('02d79bb9-eb57-4612-abf6-2cb38897d2f8')
     def test_reboot_host_with_non_admin_user(self):
-        # Non admin user is not allowed to reboot host.
+        """Non admin user is not allowed to reboot host"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.reboot_host,
                           self.hostname)
diff --git a/tempest/api/compute/admin/test_hypervisor.py b/tempest/api/compute/admin/test_hypervisor.py
index e45aac5..347193d 100644
--- a/tempest/api/compute/admin/test_hypervisor.py
+++ b/tempest/api/compute/admin/test_hypervisor.py
@@ -36,19 +36,19 @@
 
     @decorators.idempotent_id('7f0ceacd-c64d-4e96-b8ee-d02943142cc5')
     def test_get_hypervisor_list(self):
-        # List of hypervisor and available hypervisors hostname
+        """List of hypervisor and available hypervisors hostname"""
         hypers = self._list_hypervisors()
         self.assertNotEmpty(hypers, "No hypervisors found.")
 
     @decorators.idempotent_id('1e7fdac2-b672-4ad1-97a4-bad0e3030118')
     def test_get_hypervisor_list_details(self):
-        # Display the details of the all hypervisor
+        """Display the details of the all hypervisor"""
         hypers = self.client.list_hypervisors(detail=True)['hypervisors']
         self.assertNotEmpty(hypers, "No hypervisors found.")
 
     @decorators.idempotent_id('94ff9eae-a183-428e-9cdb-79fde71211cc')
     def test_get_hypervisor_show_details(self):
-        # Display the details of the specified hypervisor
+        """Display the details of the specified hypervisor"""
         hypers = self._list_hypervisors()
         self.assertNotEmpty(hypers, "No hypervisors found.")
 
@@ -59,14 +59,14 @@
 
     @decorators.idempotent_id('797e4f28-b6e0-454d-a548-80cc77c00816')
     def test_get_hypervisor_stats(self):
-        # Verify the stats of the all hypervisor
+        """Verify the stats of the all hypervisor"""
         stats = (self.client.show_hypervisor_statistics()
                  ['hypervisor_statistics'])
         self.assertNotEmpty(stats)
 
     @decorators.idempotent_id('91a50d7d-1c2b-4f24-b55a-a1fe20efca70')
     def test_get_hypervisor_uptime(self):
-        # Verify that GET shows the specified hypervisor uptime
+        """Verify that GET shows the specified hypervisor uptime"""
         hypers = self._list_hypervisors()
 
         # Ironic will register each baremetal node as a 'hypervisor',
@@ -106,10 +106,13 @@
 
 
 class HypervisorAdminV228Test(HypervisorAdminTestBase):
+    """Tests Hypervisors API higher than 2.27 that require admin privileges"""
+
     min_microversion = '2.28'
 
     @decorators.idempotent_id('d46bab64-0fbe-4eb8-9133-e6ee56188cc5')
     def test_get_list_hypervisor_details(self):
+        """Test listing and showing hypervisor details"""
         # NOTE(zhufl): This test tests the hypervisor APIs response schema
         # for 2.28 microversion. No specific assert or behaviour verification
         # is needed.
@@ -119,11 +122,13 @@
 
 
 class HypervisorAdminUnderV252Test(HypervisorAdminTestBase):
+    """Tests Hypervisors API below 2.53 that require admin privileges"""
+
     max_microversion = '2.52'
 
     @decorators.idempotent_id('e81bba3f-6215-4e39-a286-d52d2f906862')
     def test_get_hypervisor_show_servers(self):
-        # Show instances about the specific hypervisors
+        """Test showing instances about the specific hypervisors"""
         hypers = self._list_hypervisors()
         self.assertNotEmpty(hypers, "No hypervisors found.")
 
@@ -134,7 +139,7 @@
 
     @decorators.idempotent_id('d7e1805b-3b14-4a3b-b6fd-50ec6d9f361f')
     def test_search_hypervisor(self):
-        # Searching for hypervisors by its name.
+        """Test searching for hypervisors by its name"""
         hypers = self._list_hypervisors()
         self.assertNotEmpty(hypers, "No hypervisors found.")
         hypers = self.client.search_hypervisor(
diff --git a/tempest/api/compute/admin/test_hypervisor_negative.py b/tempest/api/compute/admin/test_hypervisor_negative.py
index 723b93c..9aaffd9 100644
--- a/tempest/api/compute/admin/test_hypervisor_negative.py
+++ b/tempest/api/compute/admin/test_hypervisor_negative.py
@@ -40,8 +40,9 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c136086a-0f67-4b2b-bc61-8482bd68989f')
     def test_show_nonexistent_hypervisor(self):
-        # Showing not existing hypervisor should fail.
+        """Test showing non existent hypervisor should fail"""
         nonexistent_hypervisor_id = data_utils.rand_uuid()
+
         self.assertRaises(
             lib_exc.NotFound,
             self.client.show_hypervisor,
@@ -50,7 +51,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('51e663d0-6b89-4817-a465-20aca0667d03')
     def test_show_hypervisor_with_non_admin_user(self):
-        # Non admin user is not allowed to show hypervisor.
+        """Test showing hypervisor by non admin user should fail"""
         hypers = self._list_hypervisors()
         self.assertNotEmpty(hypers)
 
@@ -62,7 +63,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e2b061bb-13f9-40d8-9d6e-d5bf17595849')
     def test_get_hypervisor_stats_with_non_admin_user(self):
-        # Non admin user is not allowed to get hypervisor stats.
+        """Test getting hypervisor stats by non admin user should fail"""
         self.assertRaises(
             lib_exc.Forbidden,
             self.non_adm_client.show_hypervisor_statistics)
@@ -70,7 +71,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f60aa680-9a3a-4c7d-90e1-fae3a4891303')
     def test_get_nonexistent_hypervisor_uptime(self):
-        # Getting uptime of not existing hypervisor should fail.
+        """Test showing uptime of non existent hypervisor should fail"""
         nonexistent_hypervisor_id = data_utils.rand_uuid()
 
         self.assertRaises(
@@ -81,7 +82,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6c3461f9-c04c-4e2a-bebb-71dc9cb47df2')
     def test_get_hypervisor_uptime_with_non_admin_user(self):
-        # Non admin user is not allowed to get hypervisor uptime.
+        """Test showing uptime of hypervisor by non admin user should fail"""
         hypers = self._list_hypervisors()
         self.assertNotEmpty(hypers)
 
@@ -93,7 +94,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('51b3d536-9b14-409c-9bce-c6f7c794994e')
     def test_get_hypervisor_list_with_non_admin_user(self):
-        # List of hypervisor and available services with non admin user
+        """Test listing hypervisors by non admin user should fail"""
         self.assertRaises(
             lib_exc.Forbidden,
             self.non_adm_client.list_hypervisors)
@@ -101,19 +102,21 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('dc02db05-e801-4c5f-bc8e-d915290ab345')
     def test_get_hypervisor_list_details_with_non_admin_user(self):
-        # Non admin user is not allowed to list hypervisor details.
+        """Test listing hypervisor details by non admin user should fail"""
         self.assertRaises(
             lib_exc.Forbidden,
             self.non_adm_client.list_hypervisors, detail=True)
 
 
 class HypervisorAdminNegativeUnderV252Test(HypervisorAdminNegativeTestBase):
+    """Tests Hypervisors API below ver 2.53 that require admin privileges"""
+
     max_microversion = '2.52'
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('2a0a3938-832e-4859-95bf-1c57c236b924')
     def test_show_servers_with_non_admin_user(self):
-        # Non admin user is not allowed to show servers on hypervisor.
+        """Test showing hypervisor servers by non admin user should fail"""
         hypers = self._list_hypervisors()
         self.assertNotEmpty(hypers)
 
@@ -125,7 +128,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('02463d69-0ace-4d33-a4a8-93d7883a2bba')
     def test_show_servers_with_nonexistent_hypervisor(self):
-        # Showing servers on not existing hypervisor should fail.
+        """Test showing servers on non existent hypervisor should fail"""
         nonexistent_hypervisor_id = data_utils.rand_uuid()
 
         self.assertRaises(
@@ -136,7 +139,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5b6a6c79-5dc1-4fa5-9c58-9c8085948e74')
     def test_search_hypervisor_with_non_admin_user(self):
-        # Non admin user is not allowed to search hypervisor.
+        """Test searching hypervisor by non admin user should fail"""
         hypers = self._list_hypervisors()
         self.assertNotEmpty(hypers)
 
@@ -148,7 +151,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('19a45cc1-1000-4055-b6d2-28e8b2ec4faa')
     def test_search_nonexistent_hypervisor(self):
-        # Searching not existing hypervisor should fail.
+        """Test searching non existent hypervisor should fail"""
         self.assertRaises(
             lib_exc.NotFound,
             self.client.search_hypervisor,
diff --git a/tempest/api/compute/admin/test_instance_usage_audit_log.py b/tempest/api/compute/admin/test_instance_usage_audit_log.py
index 1b62249..4dcbb3b 100644
--- a/tempest/api/compute/admin/test_instance_usage_audit_log.py
+++ b/tempest/api/compute/admin/test_instance_usage_audit_log.py
@@ -22,6 +22,7 @@
 
 
 class InstanceUsageAuditLogTestJSON(base.BaseV2ComputeAdminTest):
+    """Test instance usage audit logs API"""
 
     @classmethod
     def setup_clients(cls):
@@ -30,12 +31,12 @@
 
     @decorators.idempotent_id('25319919-33d9-424f-9f99-2c203ee48b9d')
     def test_list_instance_usage_audit_logs(self):
-        # list instance usage audit logs
+        """Test listing instance usage audit logs"""
         self.adm_client.list_instance_usage_audit_logs()
 
     @decorators.idempotent_id('6e40459d-7c5f-400b-9e83-449fbc8e7feb')
     def test_get_instance_usage_audit_log(self):
-        # Get instance usage audit log before specified time
+        """Test getting instance usage audit log before specified time"""
         now = datetime.datetime.now()
         self.adm_client.show_instance_usage_audit_log(
             urllib.quote(now.strftime("%Y-%m-%d %H:%M:%S")))
diff --git a/tempest/api/compute/admin/test_instance_usage_audit_log_negative.py b/tempest/api/compute/admin/test_instance_usage_audit_log_negative.py
index de8e221..84d18c4 100644
--- a/tempest/api/compute/admin/test_instance_usage_audit_log_negative.py
+++ b/tempest/api/compute/admin/test_instance_usage_audit_log_negative.py
@@ -23,6 +23,7 @@
 
 
 class InstanceUsageAuditLogNegativeTestJSON(base.BaseV2ComputeAdminTest):
+    """Negative tests of instance usage audit logs"""
 
     @classmethod
     def setup_clients(cls):
@@ -32,7 +33,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a9d33178-d2c9-4131-ad3b-f4ca8d0308a2')
     def test_instance_usage_audit_logs_with_nonadmin_user(self):
-        # the instance_usage_audit_logs API just can be accessed by admin user
+        """Test list/show instance usage audit logs by non-admin should fail
+
+        The instance_usage_audit_logs API just can be accessed by admin user.
+        """
         self.assertRaises(lib_exc.Forbidden,
                           self.instance_usages_audit_log_client.
                           list_instance_usage_audit_logs)
@@ -45,6 +49,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9b952047-3641-41c7-ba91-a809fc5974c8')
     def test_get_instance_usage_audit_logs_with_invalid_time(self):
+        """Test showing instance usage audit logs with invalid time
+
+        Showing instance usage audit logs with invalid time should fail.
+        """
         self.assertRaises(lib_exc.BadRequest,
                           self.adm_client.show_instance_usage_audit_log,
                           "invalid_time")
diff --git a/tempest/api/compute/admin/test_keypairs_v210.py b/tempest/api/compute/admin/test_keypairs_v210.py
index 40ed532..3068127 100644
--- a/tempest/api/compute/admin/test_keypairs_v210.py
+++ b/tempest/api/compute/admin/test_keypairs_v210.py
@@ -19,6 +19,8 @@
 
 
 class KeyPairsV210TestJSON(base.BaseKeypairTest):
+    """Tests KeyPairs API with microversion higher than 2.9"""
+
     credentials = ['primary', 'admin']
     min_microversion = '2.10'
 
@@ -48,6 +50,13 @@
 
     @decorators.idempotent_id('3c8484af-cfb3-48f6-b8ba-d5d58bbf3eac')
     def test_admin_manage_keypairs_for_other_users(self):
+        """Test admin managing keypairs for other users
+
+        First admin creates a keypair for an other user, then admin lists
+        keypairs filtered by that user, and keypairs created for that user
+        should appear in the result and keypairs not created for that user
+        should not appear in the result.
+        """
         user_id = self.non_admin_client.user_id
         key_list = self._create_and_check_keypairs(user_id)
         first_keyname = key_list[0]['name']
diff --git a/tempest/api/compute/admin/test_live_migration.py b/tempest/api/compute/admin/test_live_migration.py
index a845c72..941315e 100644
--- a/tempest/api/compute/admin/test_live_migration.py
+++ b/tempest/api/compute/admin/test_live_migration.py
@@ -71,6 +71,10 @@
 
     def _live_migrate(self, server_id, target_host, state,
                       volume_backed=False):
+        # If target_host is None, check whether source host is different with
+        # the new host after migration.
+        if target_host is None:
+            source_host = self.get_host_for_server(server_id)
         self._migrate_server_to(server_id, target_host, volume_backed)
         waiters.wait_for_server_status(self.servers_client, server_id, state)
         migration_list = (self.admin_migration_client.list_migrations()
@@ -82,8 +86,12 @@
             if (live_migration['instance_uuid'] == server_id):
                 msg += "\n%s" % live_migration
         msg += "]"
-        self.assertEqual(target_host, self.get_host_for_server(server_id),
-                         msg)
+        if target_host is None:
+            self.assertNotEqual(source_host,
+                                self.get_host_for_server(server_id), msg)
+        else:
+            self.assertEqual(target_host, self.get_host_for_server(server_id),
+                             msg)
 
 
 class LiveMigrationTest(LiveMigrationTestBase):
@@ -105,7 +113,11 @@
         server_id = self.create_test_server(wait_until="ACTIVE",
                                             volume_backed=volume_backed)['id']
         source_host = self.get_host_for_server(server_id)
-        destination_host = self.get_host_other_than(server_id)
+        if not CONF.compute_feature_enabled.can_migrate_between_any_hosts:
+            # not to specify a host so that the scheduler will pick one
+            destination_host = None
+        else:
+            destination_host = self.get_host_other_than(server_id)
 
         if state == 'PAUSED':
             self.admin_servers_client.pause_server(server_id)
@@ -123,11 +135,17 @@
             self._live_migrate(server_id, source_host, state, volume_backed)
 
     @decorators.idempotent_id('1dce86b8-eb04-4c03-a9d8-9c1dc3ee0c7b')
+    @testtools.skipUnless(CONF.compute_feature_enabled.
+                          block_migration_for_live_migration,
+                          'Block Live migration not available')
     def test_live_block_migration(self):
         """Test live migrating an active server"""
         self._test_live_migration()
 
     @decorators.idempotent_id('1e107f21-61b2-4988-8f22-b196e938ab88')
+    @testtools.skipUnless(CONF.compute_feature_enabled.
+                          block_migration_for_live_migration,
+                          'Block Live migration not available')
     @testtools.skipUnless(CONF.compute_feature_enabled.pause,
                           'Pause is not available.')
     def test_live_block_migration_paused(self):
@@ -155,7 +173,11 @@
         """Test live migrating a server with volume attached"""
         server = self.create_test_server(wait_until="ACTIVE")
         server_id = server['id']
-        target_host = self.get_host_other_than(server_id)
+        if not CONF.compute_feature_enabled.can_migrate_between_any_hosts:
+            # not to specify a host so that the scheduler will pick one
+            target_host = None
+        else:
+            target_host = self.get_host_other_than(server_id)
 
         volume = self.create_volume()
 
diff --git a/tempest/api/compute/admin/test_live_migration_negative.py b/tempest/api/compute/admin/test_live_migration_negative.py
index 8327a3b..80c0525 100644
--- a/tempest/api/compute/admin/test_live_migration_negative.py
+++ b/tempest/api/compute/admin/test_live_migration_negative.py
@@ -24,6 +24,8 @@
 
 
 class LiveMigrationNegativeTest(base.BaseV2ComputeAdminTest):
+    """Negative tests of live migration"""
+
     @classmethod
     def skip_checks(cls):
         super(LiveMigrationNegativeTest, cls).skip_checks()
@@ -40,7 +42,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7fb7856e-ae92-44c9-861a-af62d7830bcb')
     def test_invalid_host_for_migration(self):
-        # Migrating to an invalid host should not change the status
+        """Test migrating to an invalid host should not change the status"""
         target_host = data_utils.rand_name('host')
         server = self.create_test_server(wait_until="ACTIVE")
 
@@ -52,6 +54,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6e2f94f5-2ee8-4830-bef5-5bc95bb0795b')
     def test_live_block_migration_suspended(self):
+        """Test migrating a suspended server should not change the status"""
         server = self.create_test_server(wait_until="ACTIVE")
 
         self.admin_servers_client.suspend_server(server['id'])
diff --git a/tempest/api/compute/admin/test_quotas.py b/tempest/api/compute/admin/test_quotas.py
index 0060ffe..9d5e0c9 100644
--- a/tempest/api/compute/admin/test_quotas.py
+++ b/tempest/api/compute/admin/test_quotas.py
@@ -97,9 +97,11 @@
 
 
 class QuotasAdminTestJSON(QuotasAdminTestBase):
+    """Test compute quotas by admin user"""
+
     @decorators.idempotent_id('3b0a7c8f-cf58-46b8-a60c-715a32a8ba7d')
     def test_get_default_quotas(self):
-        # Admin can get the default resource quota set for a tenant
+        """Test admin can get the default compute quota set for a project"""
         expected_quota_set = self.default_quota_set | set(['id'])
         quota_set = self.adm_client.show_default_quota_set(
             self.demo_tenant_id)['quota_set']
@@ -109,7 +111,7 @@
 
     @decorators.idempotent_id('55fbe2bf-21a9-435b-bbd2-4162b0ed799a')
     def test_update_all_quota_resources_for_tenant(self):
-        # Admin can update all the resource quota limits for a tenant
+        """Test admin can update all the compute quota limits for a project"""
         default_quota_set = self.adm_client.show_default_quota_set(
             self.demo_tenant_id)['quota_set']
         new_quota_set = {'metadata_items': 256, 'ram': 10240,
@@ -140,11 +142,12 @@
     # TODO(afazekas): merge these test cases
     @decorators.idempotent_id('ce9e0815-8091-4abd-8345-7fe5b85faa1d')
     def test_get_updated_quotas(self):
+        """Test that GET shows the updated quota set of project"""
         self._get_updated_quotas()
 
     @decorators.idempotent_id('389d04f0-3a41-405f-9317-e5f86e3c44f0')
     def test_delete_quota(self):
-        # Admin can delete the resource quota set for a project
+        """Test admin can delete the compute quota set for a project"""
         project_name = data_utils.rand_name('ram_quota_project')
         project_desc = project_name + '-desc'
         project = identity.identity_utils(self.os_admin).create_project(
@@ -165,26 +168,40 @@
 
 
 class QuotasAdminTestV236(QuotasAdminTestBase):
-    min_microversion = '2.36'
+    """Test compute quotas with microversion greater than 2.35
+
     # NOTE(gmann): This test tests the Quota APIs response schema
     # for 2.36 microversion. No specific assert or behaviour verification
     # is needed.
+    """
+
+    min_microversion = '2.36'
 
     @decorators.idempotent_id('4268b5c9-92e5-4adc-acf1-3a2798f3d803')
     def test_get_updated_quotas(self):
-        # Checking Quota update, get, get details APIs response schema
+        """Test compute quotas API with microversion greater than 2.35
+
+        Checking compute quota update, get, get details APIs response schema.
+        """
         self._get_updated_quotas()
 
 
 class QuotasAdminTestV257(QuotasAdminTestBase):
-    min_microversion = '2.57'
+    """Test compute quotas with microversion greater than 2.56
+
     # NOTE(gmann): This test tests the Quota APIs response schema
     # for 2.57 microversion. No specific assert or behaviour verification
     # is needed.
+    """
+
+    min_microversion = '2.57'
 
     @decorators.idempotent_id('e641e6c6-e86c-41a4-9e5c-9493c0ae47ad')
     def test_get_updated_quotas(self):
-        # Checking Quota update, get, get details APIs response schema
+        """Test compute quotas API with microversion greater than 2.56
+
+        Checking compute quota update, get, get details APIs response schema.
+        """
         self._get_updated_quotas()
 
 
@@ -212,6 +229,7 @@
     # 'danger' flag.
     @decorators.idempotent_id('7932ab0f-5136-4075-b201-c0e2338df51a')
     def test_update_default_quotas(self):
+        """Test updating default compute quota class set"""
         # get the current 'default' quota class values
         body = (self.adm_client.show_quota_class_set('default')
                 ['quota_class_set'])
diff --git a/tempest/api/compute/admin/test_quotas_negative.py b/tempest/api/compute/admin/test_quotas_negative.py
index f90ff92..04dbc2d 100644
--- a/tempest/api/compute/admin/test_quotas_negative.py
+++ b/tempest/api/compute/admin/test_quotas_negative.py
@@ -53,10 +53,12 @@
 
 
 class QuotasAdminNegativeTest(QuotasAdminNegativeTestBase):
+    """Negative tests of nova quotas"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('733abfe8-166e-47bb-8363-23dbd7ff3476')
     def test_update_quota_normal_user(self):
+        """Test updating nova quota by normal user should fail"""
         self.assertRaises(lib_exc.Forbidden,
                           self.client.update_quota_set,
                           self.demo_tenant_id,
@@ -67,7 +69,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('91058876-9947-4807-9f22-f6eb17140d9b')
     def test_create_server_when_cpu_quota_is_full(self):
-        # Disallow server creation when tenant's vcpu quota is full
+        """Disallow server creation when tenant's vcpu quota is full"""
         self._update_quota('cores', 0)
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.create_test_server)
@@ -75,7 +77,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6fdd7012-584d-4327-a61c-49122e0d5864')
     def test_create_server_when_memory_quota_is_full(self):
-        # Disallow server creation when tenant's memory quota is full
+        """Disallow server creation when tenant's memory quota is full"""
         self._update_quota('ram', 0)
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.create_test_server)
@@ -83,13 +85,15 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7c6be468-0274-449a-81c3-ac1c32ee0161')
     def test_create_server_when_instances_quota_is_full(self):
-        # Once instances quota limit is reached, disallow server creation
+        """Once instances quota limit is reached, disallow server creation"""
         self._update_quota('instances', 0)
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.create_test_server)
 
 
 class QuotasSecurityGroupAdminNegativeTest(QuotasAdminNegativeTestBase):
+    """Negative tests of nova security group quota"""
+
     max_microversion = '2.35'
 
     @decorators.skip_because(bug="1186354",
@@ -98,7 +102,7 @@
     @decorators.idempotent_id('7c6c8f3b-2bf6-4918-b240-57b136a66aa0')
     @utils.services('network')
     def test_security_groups_exceed_limit(self):
-        # Negative test: Creation Security Groups over limit should FAIL
+        """Negative test: Creation Security Groups over limit should FAIL"""
         # Set the quota to number of used security groups
         sg_quota = self.limits_client.show_limits()['limits']['absolute'][
             'totalSecurityGroupsUsed']
@@ -117,7 +121,7 @@
     @decorators.idempotent_id('6e9f436d-f1ed-4f8e-a493-7275dfaa4b4d')
     @utils.services('network')
     def test_security_groups_rules_exceed_limit(self):
-        # Negative test: Creation of Security Group Rules should FAIL
+        """Negative test: Creation of Security Group Rules should FAIL"""
         # when we reach limit maxSecurityGroupRules
         self._update_quota('security_group_rules', 0)
 
diff --git a/tempest/api/compute/admin/test_security_groups.py b/tempest/api/compute/admin/test_security_groups.py
index dfa801b..f0a6a84 100644
--- a/tempest/api/compute/admin/test_security_groups.py
+++ b/tempest/api/compute/admin/test_security_groups.py
@@ -20,6 +20,12 @@
 
 
 class SecurityGroupsTestAdminJSON(base.BaseV2ComputeAdminTest):
+    """Test security groups API that requires admin privilege
+
+    Test security groups API that requires admin privilege with compute
+    microversion less than 2.36
+    """
+
     max_microversion = '2.35'
 
     @classmethod
@@ -37,7 +43,17 @@
     @decorators.idempotent_id('49667619-5af9-4c63-ab5d-2cfdd1c8f7f1')
     @utils.services('network')
     def test_list_security_groups_list_all_tenants_filter(self):
-        # Admin can list security groups of all tenants
+        """Test listing security groups with all_tenants filter
+
+        1. Create two security groups for non-admin user
+        2. Create two security groups for admin user
+        3. Fetch all security groups based on 'all_tenants' search filter by
+           admin, check that all four created security groups are present in
+           fetched list
+        4. Fetch all security groups based on 'all_tenants' search filter by
+           non-admin, check only two security groups created by the provided
+           non-admin user are present in fetched list
+        """
         # List of all security groups created
         security_group_list = []
         # Create two security groups for a non-admin tenant
diff --git a/tempest/api/compute/admin/test_server_diagnostics.py b/tempest/api/compute/admin/test_server_diagnostics.py
index 005efdd..d855a62 100644
--- a/tempest/api/compute/admin/test_server_diagnostics.py
+++ b/tempest/api/compute/admin/test_server_diagnostics.py
@@ -19,6 +19,8 @@
 
 
 class ServerDiagnosticsTest(base.BaseV2ComputeAdminTest):
+    """Test server diagnostics with compute microversion less than 2.48"""
+
     min_microversion = None
     max_microversion = '2.47'
 
@@ -29,6 +31,7 @@
 
     @decorators.idempotent_id('31ff3486-b8a0-4f56-a6c0-aab460531db3')
     def test_get_server_diagnostics(self):
+        """Test getting server diagnostics"""
         server_id = self.create_test_server(wait_until='ACTIVE')['id']
         diagnostics = self.client.show_server_diagnostics(server_id)
 
@@ -41,6 +44,8 @@
 
 
 class ServerDiagnosticsV248Test(base.BaseV2ComputeAdminTest):
+    """Test server diagnostics with compute microversion greater than 2.47"""
+
     min_microversion = '2.48'
     max_microversion = 'latest'
 
@@ -51,6 +56,7 @@
 
     @decorators.idempotent_id('64d0d48c-dff1-11e6-bf01-fe55135034f3')
     def test_get_server_diagnostics(self):
+        """Test getting server diagnostics"""
         server_id = self.create_test_server(wait_until='ACTIVE')['id']
         # Response status and filed types will be checked by json schema
         self.client.show_server_diagnostics(server_id)
diff --git a/tempest/api/compute/admin/test_server_diagnostics_negative.py b/tempest/api/compute/admin/test_server_diagnostics_negative.py
index 6215c37..8f14cbc 100644
--- a/tempest/api/compute/admin/test_server_diagnostics_negative.py
+++ b/tempest/api/compute/admin/test_server_diagnostics_negative.py
@@ -18,6 +18,7 @@
 
 
 class ServerDiagnosticsNegativeTest(base.BaseV2ComputeAdminTest):
+    """Negative tests of server diagnostics"""
 
     @classmethod
     def setup_clients(cls):
@@ -27,7 +28,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e84e2234-60d2-42fa-8b30-e2d3049724ac')
     def test_get_server_diagnostics_by_non_admin(self):
-        # Non-admin user cannot view server diagnostics according to policy
+        """Test getting server diagnostics by non-admin user is forbidden
+
+        Non-admin user cannot view server diagnostics according to policy.
+        """
         server_id = self.create_test_server(wait_until='ACTIVE')['id']
         self.assertRaises(lib_exc.Forbidden,
                           self.client.show_server_diagnostics, server_id)
diff --git a/tempest/api/compute/admin/test_servers.py b/tempest/api/compute/admin/test_servers.py
index 170b2cc..ab1b49a 100644
--- a/tempest/api/compute/admin/test_servers.py
+++ b/tempest/api/compute/admin/test_servers.py
@@ -14,10 +14,13 @@
 
 from tempest.api.compute import base
 from tempest.common import waiters
+from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
 from tempest.lib import exceptions as lib_exc
 
+CONF = config.CONF
+
 
 class ServersAdminTestJSON(base.BaseV2ComputeAdminTest):
     """Tests Servers API using admin privileges"""
@@ -45,7 +48,7 @@
 
     @decorators.idempotent_id('06f960bb-15bb-48dc-873d-f96e89be7870')
     def test_list_servers_filter_by_error_status(self):
-        # Filter the list of servers by server error status
+        """Test filtering the list of servers by server error status"""
         params = {'status': 'error'}
         self.client.reset_state(self.s1_id, state='error')
         body = self.non_admin_client.list_servers(**params)
@@ -61,6 +64,7 @@
 
     @decorators.idempotent_id('d56e9540-73ed-45e0-9b88-98fc419087eb')
     def test_list_servers_detailed_filter_by_invalid_status(self):
+        """Test filtering the list of servers by invalid server status"""
         params = {'status': 'invalid_status'}
         if self.is_requested_microversion_compatible('2.37'):
             body = self.client.list_servers(detail=True, **params)
@@ -72,8 +76,11 @@
 
     @decorators.idempotent_id('51717b38-bdc1-458b-b636-1cf82d99f62f')
     def test_list_servers_by_admin(self):
-        # Listing servers by admin user returns a list which doesn't
-        # contain the other tenants' server by default
+        """Test listing servers by admin without other projects
+
+        Listing servers by admin user returns a list which doesn't
+        contain the other projects' server by default.
+        """
         body = self.client.list_servers(detail=True)
         servers = body['servers']
 
@@ -85,8 +92,11 @@
 
     @decorators.idempotent_id('9f5579ae-19b4-4985-a091-2a5d56106580')
     def test_list_servers_by_admin_with_all_tenants(self):
-        # Listing servers by admin user with all tenants parameter
-        # Here should be listed all servers
+        """Test listing servers by admin with all tenants
+
+        Listing servers by admin user with all tenants parameter,
+        all servers should be listed.
+        """
         params = {'all_tenants': ''}
         body = self.client.list_servers(detail=True, **params)
         servers = body['servers']
@@ -98,8 +108,10 @@
     @decorators.related_bug('1659811')
     @decorators.idempotent_id('7e5d6b8f-454a-4ba1-8ae2-da857af8338b')
     def test_list_servers_by_admin_with_specified_tenant(self):
-        # In nova v2, tenant_id is ignored unless all_tenants is specified
+        """Test listing servers by admin with specified project
 
+        In nova v2, tenant_id is ignored unless all_tenants is specified.
+        """
         # List the primary tenant but get nothing due to odd specified behavior
         tenant_id = self.non_admin_client.tenant_id
         params = {'tenant_id': tenant_id}
@@ -128,7 +140,7 @@
 
     @decorators.idempotent_id('86c7a8f7-50cf-43a9-9bac-5b985317134f')
     def test_list_servers_filter_by_exist_host(self):
-        # Filter the list of servers by existent host
+        """Test filtering the list of servers by existent host"""
         server = self.client.show_server(self.s1_id)['server']
         hostname = server['OS-EXT-SRV-ATTR:host']
         params = {'host': hostname, 'all_tenants': '1'}
@@ -144,6 +156,7 @@
 
     @decorators.idempotent_id('ee8ae470-db70-474d-b752-690b7892cab1')
     def test_reset_state_server(self):
+        """Test resetting server state to error/active"""
         # Reset server's state to 'error'
         self.client.reset_state(self.s1_id, state='error')
 
@@ -160,9 +173,11 @@
 
     @decorators.idempotent_id('682cb127-e5bb-4f53-87ce-cb9003604442')
     def test_rebuild_server_in_error_state(self):
-        # The server in error state should be rebuilt using the provided
-        # image and changed to ACTIVE state
+        """Test rebuilding server in error state
 
+        The server in error state should be rebuilt using the provided
+        image and changed to ACTIVE state.
+        """
         # resetting vm state require admin privilege
         self.client.reset_state(self.s1_id, state='error')
         rebuilt_server = self.non_admin_client.rebuild_server(
@@ -188,6 +203,11 @@
 
     @decorators.idempotent_id('7a1323b4-a6a2-497a-96cb-76c07b945c71')
     def test_reset_network_inject_network_info(self):
+        """Test resetting and injecting network info of a server"""
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise self.skipException(
+                'The resetNetwork server action is not supported.')
+
         # Reset Network of a Server
         server = self.create_test_server(wait_until='ACTIVE')
         self.client.reset_network(server['id'])
@@ -196,6 +216,7 @@
 
     @decorators.idempotent_id('fdcd9b33-0903-4e00-a1f7-b5f6543068d6')
     def test_create_server_with_scheduling_hint(self):
+        """Test creating server with scheduling hint"""
         # Create a server with scheduler hints.
         hints = {
             'same_host': self.s1_id
diff --git a/tempest/api/compute/admin/test_servers_negative.py b/tempest/api/compute/admin/test_servers_negative.py
index f720b84..f52d4c0 100644
--- a/tempest/api/compute/admin/test_servers_negative.py
+++ b/tempest/api/compute/admin/test_servers_negative.py
@@ -26,7 +26,7 @@
 
 
 class ServersAdminNegativeTestJSON(base.BaseV2ComputeAdminTest):
-    """Tests Servers API using admin privileges"""
+    """Negative Tests of Servers API using admin privileges"""
 
     @classmethod
     def setup_clients(cls):
@@ -47,6 +47,7 @@
                           'Resize not available.')
     @decorators.attr(type=['negative'])
     def test_resize_server_using_overlimit_ram(self):
+        """Test resizing server using over limit ram should fail"""
         # NOTE(mriedem): Avoid conflicts with os-quota-class-sets tests.
         self.useFixture(fixtures.LockFixture('compute_quotas'))
         quota_set = self.quotas_client.show_quota_set(
@@ -69,6 +70,7 @@
                           'Resize not available.')
     @decorators.attr(type=['negative'])
     def test_resize_server_using_overlimit_vcpus(self):
+        """Test resizing server using over limit vcpus should fail"""
         # NOTE(mriedem): Avoid conflicts with os-quota-class-sets tests.
         self.useFixture(fixtures.LockFixture('compute_quotas'))
         quota_set = self.quotas_client.show_quota_set(
@@ -89,6 +91,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b0b4d8af-1256-41ef-9ee7-25f1c19dde80')
     def test_reset_state_server_invalid_state(self):
+        """Test resetting server state to invalid state value should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.client.reset_state, self.s1_id,
                           state='invalid')
@@ -96,6 +99,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('4cdcc984-fab0-4577-9a9d-6d558527ee9d')
     def test_reset_state_server_invalid_type(self):
+        """Test resetting server state to invalid state type should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.client.reset_state, self.s1_id,
                           state=1)
@@ -103,13 +107,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e741298b-8df2-46f0-81cb-8f814ff2504c')
     def test_reset_state_server_nonexistent_server(self):
+        """Test resetting a non existent server's state should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.reset_state, '999', state='error')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('46a4e1ca-87ae-4d28-987a-1b6b136a0221')
     def test_migrate_non_existent_server(self):
-        # migrate a non existent server
+        """Test migrating a non existent server should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.migrate_server,
                           data_utils.rand_uuid())
@@ -121,6 +126,7 @@
                           'Suspend is not available.')
     @decorators.attr(type=['negative'])
     def test_migrate_server_invalid_state(self):
+        """Test migrating a server with invalid state should fail"""
         # create server.
         server = self.create_test_server(wait_until='ACTIVE')
         server_id = server['id']
diff --git a/tempest/api/compute/admin/test_services.py b/tempest/api/compute/admin/test_services.py
index bf846e5..24518a8 100644
--- a/tempest/api/compute/admin/test_services.py
+++ b/tempest/api/compute/admin/test_services.py
@@ -19,7 +19,10 @@
 
 
 class ServicesAdminTestJSON(base.BaseV2ComputeAdminTest):
-    """Tests Services API. List and Enable/Disable require admin privileges."""
+    """Tests Nova Services API.
+
+    List and Enable/Disable require admin privileges.
+    """
 
     @classmethod
     def setup_clients(cls):
@@ -28,13 +31,13 @@
 
     @decorators.idempotent_id('5be41ef4-53d1-41cc-8839-5c2a48a1b283')
     def test_list_services(self):
-        # Listing nova services
+        """Listing nova services"""
         services = self.client.list_services()['services']
         self.assertNotEmpty(services)
 
     @decorators.idempotent_id('f345b1ec-bc6e-4c38-a527-3ca2bc00bef5')
     def test_get_service_by_service_binary_name(self):
-        # Listing nova services by binary name.
+        """Listing nova services by binary name"""
         binary_name = 'nova-compute'
         services = self.client.list_services(binary=binary_name)['services']
         self.assertNotEmpty(services)
@@ -43,7 +46,7 @@
 
     @decorators.idempotent_id('affb42d5-5b4b-43c8-8b0b-6dca054abcca')
     def test_get_service_by_host_name(self):
-        # Listing nova services by host name.
+        """Listing nova services by host name"""
         services = self.client.list_services()['services']
         host_name = services[0]['host']
         services_on_host = [service for service in services if
diff --git a/tempest/api/compute/admin/test_services_negative.py b/tempest/api/compute/admin/test_services_negative.py
index 033caa8..a4d7d3f 100644
--- a/tempest/api/compute/admin/test_services_negative.py
+++ b/tempest/api/compute/admin/test_services_negative.py
@@ -43,6 +43,9 @@
         Expect all services to be returned when the request contains invalid
         parameters.
         """
+        if not self.is_requested_microversion_compatible('2.74'):
+            raise self.skipException(
+                "From microversion 2.75 invalid parameters are not allowed.")
         services = self.client.list_services()['services']
         services_xxx = (self.client.list_services(xxx='nova-compute')
                         ['services'])
diff --git a/tempest/api/compute/admin/test_simple_tenant_usage.py b/tempest/api/compute/admin/test_simple_tenant_usage.py
index d4c60b3..c24f420 100644
--- a/tempest/api/compute/admin/test_simple_tenant_usage.py
+++ b/tempest/api/compute/admin/test_simple_tenant_usage.py
@@ -26,6 +26,7 @@
 
 
 class TenantUsagesTestJSON(base.BaseV2ComputeAdminTest):
+    """Test tenant usages"""
 
     @classmethod
     def setup_clients(cls):
@@ -67,7 +68,7 @@
 
     @decorators.idempotent_id('062c8ae9-9912-4249-8b51-e38d664e926e')
     def test_list_usage_all_tenants(self):
-        # Get usage for all tenants
+        """Test getting usage for all tenants"""
         tenant_usage = self.call_until_valid(
             self.adm_client.list_tenant_usages, VALID_WAIT,
             start=self.start, end=self.end, detailed="1")['tenant_usages'][0]
@@ -75,7 +76,7 @@
 
     @decorators.idempotent_id('94135049-a4c5-4934-ad39-08fa7da4f22e')
     def test_get_usage_tenant(self):
-        # Get usage for a specific tenant
+        """Test getting usage for a specific tenant"""
         tenant_usage = self.call_until_valid(
             self.adm_client.show_tenant_usage, VALID_WAIT,
             self.tenant_id, start=self.start, end=self.end)['tenant_usage']
@@ -84,7 +85,7 @@
 
     @decorators.idempotent_id('9d00a412-b40e-4fd9-8eba-97b496316116')
     def test_get_usage_tenant_with_non_admin_user(self):
-        # Get usage for a specific tenant with non admin user
+        """Test getting usage for a specific tenant with non admin user"""
         tenant_usage = self.call_until_valid(
             self.client.show_tenant_usage, VALID_WAIT,
             self.tenant_id, start=self.start, end=self.end)['tenant_usage']
diff --git a/tempest/api/compute/admin/test_simple_tenant_usage_negative.py b/tempest/api/compute/admin/test_simple_tenant_usage_negative.py
index cb60b8d..4b5a5d5 100644
--- a/tempest/api/compute/admin/test_simple_tenant_usage_negative.py
+++ b/tempest/api/compute/admin/test_simple_tenant_usage_negative.py
@@ -21,6 +21,7 @@
 
 
 class TenantUsagesNegativeTestJSON(base.BaseV2ComputeAdminTest):
+    """Negative tests of compute tenant usages API"""
 
     @classmethod
     def setup_clients(cls):
@@ -43,7 +44,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8b21e135-d94b-4991-b6e9-87059609c8ed')
     def test_get_usage_tenant_with_empty_tenant_id(self):
-        # Get usage for a specific tenant empty
+        """Test getting tenant usage with empty tenant id should fail"""
         params = {'start': self.start,
                   'end': self.end}
         self.assertRaises(lib_exc.NotFound,
@@ -53,7 +54,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('4079dd2a-9e8d-479f-869d-6fa985ce45b6')
     def test_get_usage_tenant_with_invalid_date(self):
-        # Get usage for tenant with invalid date
+        """Test getting tenant usage with invalid time range should fail"""
         params = {'start': self.end,
                   'end': self.start}
         self.assertRaises(lib_exc.BadRequest,
@@ -63,7 +64,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('bbe6fe2c-15d8-404c-a0a2-44fad0ad5cc7')
     def test_list_usage_all_tenants_with_non_admin_user(self):
-        # Get usage for all tenants with non admin user
+        """Test listing usage of all tenants by non-admin user is forbidden"""
         params = {'start': self.start,
                   'end': self.end,
                   'detailed': "1"}
diff --git a/tempest/api/compute/admin/test_volume_swap.py b/tempest/api/compute/admin/test_volume_swap.py
index edcb1a7..c1236a7 100644
--- a/tempest/api/compute/admin/test_volume_swap.py
+++ b/tempest/api/compute/admin/test_volume_swap.py
@@ -68,21 +68,7 @@
 
 
 class TestVolumeSwap(TestVolumeSwapBase):
-    """The test suite for swapping of volume with admin user.
-
-    The following is the scenario outline:
-
-    1. Create a volume "volume1" with non-admin.
-    2. Create a volume "volume2" with non-admin.
-    3. Boot an instance "instance1" with non-admin.
-    4. Attach "volume1" to "instance1" with non-admin.
-    5. Swap volume from "volume1" to "volume2" as admin.
-    6. Check the swap volume is successful and "volume2"
-       is attached to "instance1" and "volume1" is in available state.
-    7. Swap volume from "volume2" to "volume1" as admin.
-    8. Check the swap volume is successful and "volume1"
-       is attached to "instance1" and "volume2" is in available state.
-    """
+    """The test suite for swapping of volume with admin user"""
 
     # NOTE(mriedem): This is an uncommon scenario to call the compute API
     # to swap volumes directly; swap volume is primarily only for volume
@@ -92,6 +78,21 @@
     @decorators.idempotent_id('1769f00d-a693-4d67-a631-6a3496773813')
     @utils.services('volume')
     def test_volume_swap(self):
+        """Test swapping of volume attached to server with admin user
+
+        The following is the scenario outline:
+
+        1. Create a volume "volume1" with non-admin.
+        2. Create a volume "volume2" with non-admin.
+        3. Boot an instance "instance1" with non-admin.
+        4. Attach "volume1" to "instance1" with non-admin.
+        5. Swap volume from "volume1" to "volume2" as admin.
+        6. Check the swap volume is successful and "volume2"
+           is attached to "instance1" and "volume1" is in available state.
+        7. Swap volume from "volume2" to "volume1" as admin.
+        8. Check the swap volume is successful and "volume1"
+           is attached to "instance1" and "volume2" is in available state.
+        """
         # Create two volumes.
         # NOTE(gmann): Volumes are created before server creation so that
         # volumes cleanup can happen successfully irrespective of which volume
@@ -134,6 +135,12 @@
 
 
 class TestMultiAttachVolumeSwap(TestVolumeSwapBase):
+    """Test swapping volume attached to multiple servers
+
+    Test swapping volume attached to multiple servers with microversion
+    greater than 2.59
+    """
+
     min_microversion = '2.60'
     max_microversion = 'latest'
 
@@ -164,6 +171,20 @@
                              condition=CONF.compute.min_compute_nodes > 1)
     @utils.services('volume')
     def test_volume_swap_with_multiattach(self):
+        """Test swapping volume attached to multiple servers
+
+        The following is the scenario outline:
+
+        1. Create a volume "volume1" with non-admin.
+        2. Create a volume "volume2" with non-admin.
+        3. Boot 2 instances "server1" and "server2" with non-admin.
+        4. Attach "volume1" to "server1" with non-admin.
+        5. Attach "volume1" to "server2" with non-admin.
+        6. Swap "volume1" to "volume2" on "server1"
+        7. Check "volume1" is attached to "server2" and not attached to
+           "server1"
+        8. Check "volume2" is attached to "server1".
+        """
         # Create two volumes.
         # NOTE(gmann): Volumes are created before server creation so that
         # volumes cleanup can happen successfully irrespective of which volume
diff --git a/tempest/api/compute/admin/test_volumes_negative.py b/tempest/api/compute/admin/test_volumes_negative.py
index 7b0f48b..10d522b 100644
--- a/tempest/api/compute/admin/test_volumes_negative.py
+++ b/tempest/api/compute/admin/test_volumes_negative.py
@@ -23,6 +23,8 @@
 
 
 class VolumesAdminNegativeTest(base.BaseV2ComputeAdminTest):
+    """Negative tests of volume swapping"""
+
     create_default_network = True
 
     @classmethod
@@ -40,6 +42,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('309b5ecd-0585-4a7e-a36f-d2b2bf55259d')
     def test_update_attached_volume_with_nonexistent_volume_in_uri(self):
+        """Test swapping non existent volume should fail"""
         volume = self.create_volume()
         nonexistent_volume = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
@@ -51,6 +54,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7dcac15a-b107-46d3-a5f6-cb863f4e454a')
     def test_update_attached_volume_with_nonexistent_volume_in_body(self):
+        """Test swapping volume to a non existence volume should fail"""
         volume = self.create_volume()
         self.attach_volume(self.server, volume)
 
@@ -62,6 +66,12 @@
 
 
 class UpdateMultiattachVolumeNegativeTest(base.BaseV2ComputeAdminTest):
+    """Negative tests of swapping volume attached to multiple servers
+
+    Negative tests of swapping volume attached to multiple servers with
+    compute microversion greater than 2.59 and volume microversion greater
+    than 3.26
+    """
 
     min_microversion = '2.60'
     volume_min_microversion = '3.27'
@@ -76,7 +86,16 @@
     @decorators.idempotent_id('7576d497-b7c6-44bd-9cc5-c5b4e50fec71')
     @utils.services('volume')
     def test_multiattach_rw_volume_update_failure(self):
+        """Test swapping volume attached to multi-servers with read-write mode
 
+        1. Create two volumes "vol1" and "vol2"
+        2. Create two instances "server1" and "server2"
+        3. Attach "vol1" to both of these instances
+        4. By default both of these attachments should have an attach_mode of
+           read-write, so trying to swap "vol1" to "vol2" should fail
+        5. Check "vol1" is still attached to both servers
+        6. Check "vol2" is not attached to any server
+        """
         # Create two multiattach capable volumes.
         vol1 = self.create_volume(multiattach=True)
         vol2 = self.create_volume(multiattach=True)
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index 74570ce..8b847fc 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -566,17 +566,19 @@
         # the state of the volume to change to available. This is so we don't
         # error out when trying to delete the volume during teardown.
         if volume['multiattach']:
+            att = waiters.wait_for_volume_attachment_create(
+                self.volumes_client, volume['id'], server['id'])
             self.addCleanup(waiters.wait_for_volume_attachment_remove,
                             self.volumes_client, volume['id'],
-                            attachment['id'])
+                            att['attachment_id'])
         else:
             self.addCleanup(waiters.wait_for_volume_resource_status,
                             self.volumes_client, volume['id'], 'available')
+            waiters.wait_for_volume_resource_status(self.volumes_client,
+                                                    volume['id'], 'in-use')
         # Ignore 404s on detach in case the server is deleted or the volume
         # is already detached.
         self.addCleanup(self._detach_volume, server, volume)
-        waiters.wait_for_volume_resource_status(self.volumes_client,
-                                                volume['id'], 'in-use')
         return attachment
 
     def create_volume_snapshot(self, volume_id, name=None, description=None,
diff --git a/tempest/api/compute/certificates/test_certificates.py b/tempest/api/compute/certificates/test_certificates.py
index 0e6c016..5917931 100644
--- a/tempest/api/compute/certificates/test_certificates.py
+++ b/tempest/api/compute/certificates/test_certificates.py
@@ -21,6 +21,7 @@
 
 
 class CertificatesV2TestJSON(base.BaseV2ComputeTest):
+    """Test Certificates API"""
 
     @classmethod
     def skip_checks(cls):
@@ -30,10 +31,10 @@
 
     @decorators.idempotent_id('c070a441-b08e-447e-a733-905909535b1b')
     def test_create_root_certificate(self):
-        # create certificates
+        """Test creating root certificate"""
         self.certificates_client.create_certificate()
 
     @decorators.idempotent_id('3ac273d0-92d2-4632-bdfc-afbc21d4606c')
     def test_get_root_certificate(self):
-        # get the root certificate
+        """Test getting root certificate details"""
         self.certificates_client.show_certificate('root')
diff --git a/tempest/api/compute/flavors/test_flavors.py b/tempest/api/compute/flavors/test_flavors.py
index 20294e9..9ab75c5 100644
--- a/tempest/api/compute/flavors/test_flavors.py
+++ b/tempest/api/compute/flavors/test_flavors.py
@@ -18,20 +18,24 @@
 
 
 class FlavorsV2TestJSON(base.BaseV2ComputeTest):
+    """Tests Flavors"""
 
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('e36c0eaa-dff5-4082-ad1f-3f9a80aa3f59')
     def test_list_flavors(self):
-        # List of all flavors should contain the expected flavor
+        """List of all flavors should contain the expected flavor"""
         flavors = self.flavors_client.list_flavors()['flavors']
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         flavor_min_detail = {'id': flavor['id'], 'links': flavor['links'],
                              'name': flavor['name']}
+        # description field is added to the response of list_flavors in 2.55
+        if not self.is_requested_microversion_compatible('2.54'):
+            flavor_min_detail.update({'description': flavor['description']})
         self.assertIn(flavor_min_detail, flavors)
 
     @decorators.idempotent_id('6e85fde4-b3cd-4137-ab72-ed5f418e8c24')
     def test_list_flavors_with_detail(self):
-        # Detailed list of all flavors should contain the expected flavor
+        """Detailed list of all flavors should contain the expected flavor"""
         flavors = self.flavors_client.list_flavors(detail=True)['flavors']
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         self.assertIn(flavor, flavors)
@@ -39,20 +43,20 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('1f12046b-753d-40d2-abb6-d8eb8b30cb2f')
     def test_get_flavor(self):
-        # The expected flavor details should be returned
+        """The expected flavor details should be returned"""
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         self.assertEqual(self.flavor_ref, flavor['id'])
 
     @decorators.idempotent_id('8d7691b3-6ed4-411a-abc9-2839a765adab')
     def test_list_flavors_limit_results(self):
-        # Only the expected number of flavors should be returned
+        """Only the expected number of flavors should be returned"""
         params = {'limit': 1}
         flavors = self.flavors_client.list_flavors(**params)['flavors']
         self.assertEqual(1, len(flavors))
 
     @decorators.idempotent_id('b26f6327-2886-467a-82be-cef7a27709cb')
     def test_list_flavors_detailed_limit_results(self):
-        # Only the expected number of flavors (detailed) should be returned
+        """Only the expected number of flavors(detailed) should be returned"""
         params = {'limit': 1}
         flavors = self.flavors_client.list_flavors(detail=True,
                                                    **params)['flavors']
@@ -60,7 +64,7 @@
 
     @decorators.idempotent_id('e800f879-9828-4bd0-8eae-4f17189951fb')
     def test_list_flavors_using_marker(self):
-        # The list of flavors should start from the provided marker
+        """The list of flavors should start from the provided marker"""
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         flavor_id = flavor['id']
 
@@ -71,7 +75,7 @@
 
     @decorators.idempotent_id('6db2f0c0-ddee-4162-9c84-0703d3dd1107')
     def test_list_flavors_detailed_using_marker(self):
-        # The list of flavors should start from the provided marker
+        """The list of flavors should start from the provided marker"""
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         flavor_id = flavor['id']
 
@@ -83,7 +87,7 @@
 
     @decorators.idempotent_id('3df2743e-3034-4e57-a4cb-b6527f6eac79')
     def test_list_flavors_detailed_filter_by_min_disk(self):
-        # The detailed list of flavors should be filtered by disk space
+        """The detailed list of flavors should be filtered by disk space"""
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         flavor_id = flavor['id']
 
@@ -94,7 +98,7 @@
 
     @decorators.idempotent_id('09fe7509-b4ee-4b34-bf8b-39532dc47292')
     def test_list_flavors_detailed_filter_by_min_ram(self):
-        # The detailed list of flavors should be filtered by RAM
+        """The detailed list of flavors should be filtered by RAM"""
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         flavor_id = flavor['id']
 
@@ -105,7 +109,7 @@
 
     @decorators.idempotent_id('10645a4d-96f5-443f-831b-730711e11dd4')
     def test_list_flavors_filter_by_min_disk(self):
-        # The list of flavors should be filtered by disk space
+        """The list of flavors should be filtered by disk space"""
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         flavor_id = flavor['id']
 
@@ -115,7 +119,7 @@
 
     @decorators.idempotent_id('935cf550-e7c8-4da6-8002-00f92d5edfaa')
     def test_list_flavors_filter_by_min_ram(self):
-        # The list of flavors should be filtered by RAM
+        """The list of flavors should be filtered by RAM"""
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         flavor_id = flavor['id']
 
diff --git a/tempest/api/compute/floating_ips/test_floating_ips_actions.py b/tempest/api/compute/floating_ips/test_floating_ips_actions.py
index 2adc482..6097bbc 100644
--- a/tempest/api/compute/floating_ips/test_floating_ips_actions.py
+++ b/tempest/api/compute/floating_ips/test_floating_ips_actions.py
@@ -25,13 +25,13 @@
 
 
 class FloatingIPsTestJSON(base.BaseFloatingIPsTest):
+    """Test floating ips API with compute microversion less than 2.36"""
 
     max_microversion = '2.35'
 
     @decorators.idempotent_id('f7bfb946-297e-41b8-9e8c-aba8e9bb5194')
     def test_allocate_floating_ip(self):
-        # Positive test:Allocation of a new floating IP to a project
-        # should be successful
+        """Test allocating a floating ip to a project"""
         body = self.client.create_floating_ip(
             pool=CONF.network.floating_network_name)['floating_ip']
         floating_ip_id_allocated = body['id']
@@ -45,8 +45,7 @@
 
     @decorators.idempotent_id('de45e989-b5ca-4a9b-916b-04a52e7bbb8b')
     def test_delete_floating_ip(self):
-        # Positive test:Deletion of valid floating IP from project
-        # should be successful
+        """Test deleting a valid floating ip from project"""
         # Creating the floating IP that is to be deleted in this method
         floating_ip_body = self.client.create_floating_ip(
             pool=CONF.network.floating_network_name)['floating_ip']
@@ -59,6 +58,7 @@
 
 
 class FloatingIPsAssociationTestJSON(base.BaseFloatingIPsTest):
+    """Test floating ips association with microversion less than 2.44"""
 
     max_microversion = '2.43'
 
@@ -80,9 +80,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_associate_disassociate_floating_ip(self):
-        # Positive test:Associate and disassociate the provided floating IP
-        # to a specific server should be successful
-
+        """Test associate/disassociate floating ip to a server"""
         # Association of floating IP to fixed IP address
         self.client.associate_floating_ip_to_server(
             self.floating_ip,
@@ -102,6 +100,12 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_associate_already_associated_floating_ip(self):
+        """Test associating an already associated floating ip
+
+        First associate a floating ip to server1, then associate the floating
+        ip to server2, the floating ip will be associated to server2 and no
+        longer associated to server1.
+        """
         # positive test:Association of an already associated floating IP
         # to specific server should change the association of the Floating IP
         # Create server so as to use for Multiple association
diff --git a/tempest/api/compute/floating_ips/test_floating_ips_actions_negative.py b/tempest/api/compute/floating_ips/test_floating_ips_actions_negative.py
index 9257458..e99e218 100644
--- a/tempest/api/compute/floating_ips/test_floating_ips_actions_negative.py
+++ b/tempest/api/compute/floating_ips/test_floating_ips_actions_negative.py
@@ -25,6 +25,7 @@
 
 
 class FloatingIPsNegativeTestJSON(base.BaseFloatingIPsTest):
+    """Test floating ips API with compute microversion less than 2.36"""
 
     max_microversion = '2.35'
 
@@ -46,8 +47,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6e0f059b-e4dd-48fb-8207-06e3bba5b074')
     def test_allocate_floating_ip_from_nonexistent_pool(self):
-        # Negative test:Allocation of a new floating IP from a nonexistent_pool
-        # to a project should fail
+        """Test allocating floating ip from non existent pool should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.create_floating_ip,
                           pool="non_exist_pool")
@@ -55,15 +55,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ae1c55a8-552b-44d4-bfb6-2a115a15d0ba')
     def test_delete_nonexistent_floating_ip(self):
-        # Negative test:Deletion of a nonexistent floating IP
-        # from project should fail
-
+        """Test deleting non existent floating ip should fail"""
         # Deleting the non existent floating IP
         self.assertRaises(lib_exc.NotFound, self.client.delete_floating_ip,
                           self.non_exist_id)
 
 
 class FloatingIPsAssociationNegativeTestJSON(base.BaseFloatingIPsTest):
+    """Test floating ips API with compute microversion less than 2.44"""
 
     max_microversion = '2.43'
 
@@ -76,8 +75,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('595fa616-1a71-4670-9614-46564ac49a4c')
     def test_associate_nonexistent_floating_ip(self):
-        # Negative test:Association of a non existent floating IP
-        # to specific server should fail
+        """Test associating non existent floating ip to server should fail"""
         # Associating non existent floating IP
         self.assertRaises(lib_exc.NotFound,
                           self.client.associate_floating_ip_to_server,
@@ -86,7 +84,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0a081a66-e568-4e6b-aa62-9587a876dca8')
     def test_dissociate_nonexistent_floating_ip(self):
-        # Negative test:Dissociation of a non existent floating IP should fail
+        """Test dissociating non existent floating ip should fail"""
         # Dissociating non existent floating IP
         self.assertRaises(lib_exc.NotFound,
                           self.client.disassociate_floating_ip_from_server,
@@ -95,7 +93,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('804b4fcb-bbf5-412f-925d-896672b61eb3')
     def test_associate_ip_to_server_without_passing_floating_ip(self):
-        # Negative test:Association of empty floating IP to specific server
+        """Test associating empty floating ip to server should fail"""
         # should raise NotFound or BadRequest(In case of Nova V2.1) exception.
         self.assertRaises((lib_exc.NotFound, lib_exc.BadRequest),
                           self.client.associate_floating_ip_to_server,
@@ -106,10 +104,13 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_associate_ip_to_server_with_floating_ip(self):
-        # The VM have one port
-        # Associate floating IP A to the VM
-        # Associate floating IP B which is from same pool with floating IP A
-        # to the VM, should raise BadRequest exception
+        """Test associating floating ip to server already with floating ip
+
+        1. The VM have one port
+        2. Associate floating IP A to the VM
+        3. Associate floating IP B which is from same pool with floating IP A
+           to the VM, should raise BadRequest exception
+        """
         body = self.client.create_floating_ip(
             pool=CONF.network.public_network_id)['floating_ip']
         self.addCleanup(self.client.delete_floating_ip, body['id'])
diff --git a/tempest/api/compute/floating_ips/test_list_floating_ips.py b/tempest/api/compute/floating_ips/test_list_floating_ips.py
index 944f798..6bfee95 100644
--- a/tempest/api/compute/floating_ips/test_list_floating_ips.py
+++ b/tempest/api/compute/floating_ips/test_list_floating_ips.py
@@ -21,6 +21,7 @@
 
 
 class FloatingIPDetailsTestJSON(base.BaseFloatingIPsTest):
+    """Test floating ip details with compute microversion less than 2.36"""
 
     max_microversion = '2.35'
 
@@ -37,7 +38,7 @@
 
     @decorators.idempotent_id('16db31c3-fb85-40c9-bbe2-8cf7b67ff99f')
     def test_list_floating_ips(self):
-        # Positive test:Should return the list of floating IPs
+        """Test listing floating ips"""
         body = self.client.list_floating_ips()['floating_ips']
         floating_ips = body
         self.assertNotEmpty(floating_ips,
@@ -47,7 +48,7 @@
 
     @decorators.idempotent_id('eef497e0-8ff7-43c8-85ef-558440574f84')
     def test_get_floating_ip_details(self):
-        # Positive test:Should be able to GET the details of floatingIP
+        """Test getting floating ip details"""
         # Creating a floating IP for which details are to be checked
         body = self.client.create_floating_ip(
             pool=CONF.network.floating_network_name)['floating_ip']
@@ -68,7 +69,7 @@
 
     @decorators.idempotent_id('df389fc8-56f5-43cc-b290-20eda39854d3')
     def test_list_floating_ip_pools(self):
-        # Positive test:Should return the list of floating IP Pools
+        """Test listing floating ip pools"""
         floating_ip_pools = self.pools_client.list_floating_ip_pools()
         self.assertNotEmpty(floating_ip_pools['floating_ip_pools'],
                             "Expected floating IP Pools. Got zero.")
diff --git a/tempest/api/compute/floating_ips/test_list_floating_ips_negative.py b/tempest/api/compute/floating_ips/test_list_floating_ips_negative.py
index d69248c..aa0320d 100644
--- a/tempest/api/compute/floating_ips/test_list_floating_ips_negative.py
+++ b/tempest/api/compute/floating_ips/test_list_floating_ips_negative.py
@@ -23,14 +23,18 @@
 
 
 class FloatingIPDetailsNegativeTestJSON(base.BaseFloatingIPsTest):
+    """Negative tests of floating ip detail
+
+    Negative tests of floating ip detail with compute microversion less
+    than 2.36.
+    """
 
     max_microversion = '2.35'
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7ab18834-4a4b-4f28-a2c5-440579866695')
     def test_get_nonexistent_floating_ip_details(self):
-        # Negative test:Should not be able to GET the details
-        # of non-existent floating IP
+        """Test getting non existent floating ip should fail"""
         # Creating a non-existent floatingIP id
         if CONF.service_available.neutron:
             non_exist_id = data_utils.rand_uuid()
diff --git a/tempest/api/compute/images/test_image_metadata.py b/tempest/api/compute/images/test_image_metadata.py
index 1f3af5f..561265f 100644
--- a/tempest/api/compute/images/test_image_metadata.py
+++ b/tempest/api/compute/images/test_image_metadata.py
@@ -28,6 +28,8 @@
 
 
 class ImagesMetadataTestJSON(base.BaseV2ComputeTest):
+    """Test image metadata with compute microversion less than 2.39"""
+
     max_microversion = '2.38'
 
     @classmethod
@@ -89,7 +91,10 @@
 
     @decorators.idempotent_id('37ec6edd-cf30-4c53-bd45-ae74db6b0531')
     def test_list_image_metadata(self):
-        # All metadata key/value pairs for an image should be returned
+        """Test listing image metadata
+
+        All metadata key/value pairs for an image should be returned.
+        """
         resp_metadata = self.client.list_image_metadata(self.image_id)
         expected = {'metadata': {
             'os_version': 'value1', 'os_distro': 'value2'}}
@@ -97,7 +102,10 @@
 
     @decorators.idempotent_id('ece7befc-d3ce-42a4-b4be-c3067a418c29')
     def test_set_image_metadata(self):
-        # The metadata for the image should match the new values
+        """Test setting image metadata
+
+        The metadata for the image should match the new values.
+        """
         req_metadata = {'os_version': 'value2', 'architecture': 'value3'}
         self.client.set_image_metadata(self.image_id,
                                        req_metadata)
@@ -108,7 +116,10 @@
 
     @decorators.idempotent_id('7b491c11-a9d5-40fe-a696-7f7e03d3fea2')
     def test_update_image_metadata(self):
-        # The metadata for the image should match the updated values
+        """Test updating image medata
+
+        The metadata for the image should match the updated values.
+        """
         req_metadata = {'os_version': 'alt1', 'architecture': 'value3'}
         self.client.update_image_metadata(self.image_id,
                                           req_metadata)
@@ -122,15 +133,21 @@
 
     @decorators.idempotent_id('4f5db52f-6685-4c75-b848-f4bb363f9aa6')
     def test_get_image_metadata_item(self):
-        # The value for a specific metadata key should be returned
+        """Test getting image metadata item
+
+        The value for a specific metadata key should be returned.
+        """
         meta = self.client.show_image_metadata_item(self.image_id,
                                                     'os_distro')['meta']
         self.assertEqual('value2', meta['os_distro'])
 
     @decorators.idempotent_id('f2de776a-4778-4d90-a5da-aae63aee64ae')
     def test_set_image_metadata_item(self):
-        # The value provided for the given meta item should be set for
-        # the image
+        """Test setting image metadata item
+
+        The value provided for the given meta item should be set for
+        the image.
+        """
         meta = {'os_version': 'alt'}
         self.client.set_image_metadata_item(self.image_id,
                                             'os_version', meta)
@@ -140,7 +157,10 @@
 
     @decorators.idempotent_id('a013796c-ba37-4bb5-8602-d944511def14')
     def test_delete_image_metadata_item(self):
-        # The metadata value/key pair should be deleted from the image
+        """Test deleting image metadata item
+
+        The metadata value/key pair should be deleted from the image.
+        """
         self.client.delete_image_metadata_item(self.image_id,
                                                'os_version')
         resp_metadata = self.client.list_image_metadata(self.image_id)
diff --git a/tempest/api/compute/images/test_image_metadata_negative.py b/tempest/api/compute/images/test_image_metadata_negative.py
index 407fb08..b9806c7 100644
--- a/tempest/api/compute/images/test_image_metadata_negative.py
+++ b/tempest/api/compute/images/test_image_metadata_negative.py
@@ -20,6 +20,11 @@
 
 
 class ImagesMetadataNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of image metadata
+
+    Negative tests of image metadata with compute microversion less than 2.39.
+    """
+
     max_microversion = '2.38'
 
     @classmethod
@@ -30,15 +35,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('94069db2-792f-4fa8-8bd3-2271a6e0c095')
     def test_list_nonexistent_image_metadata(self):
-        # Negative test: List on nonexistent image
-        # metadata should not happen
+        """Test listing metadata of a non existence image should fail"""
         self.assertRaises(lib_exc.NotFound, self.client.list_image_metadata,
                           data_utils.rand_uuid())
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a403ef9e-9f95-427c-b70a-3ce3388796f1')
     def test_update_nonexistent_image_metadata(self):
-        # Negative test:An update should not happen for a non-existent image
+        """Test updating metadata of a non existence image should fail"""
         meta = {'os_distro': 'alt1', 'os_version': 'alt2'}
         self.assertRaises(lib_exc.NotFound,
                           self.client.update_image_metadata,
@@ -47,7 +51,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('41ae052c-6ee6-405c-985e-5712393a620d')
     def test_get_nonexistent_image_metadata_item(self):
-        # Negative test: Get on non-existent image should not happen
+        """Test getting metadata of a non existence image should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.show_image_metadata_item,
                           data_utils.rand_uuid(), 'os_version')
@@ -55,7 +59,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('dc64f2ce-77e8-45b0-88c8-e15041d08eaf')
     def test_set_nonexistent_image_metadata(self):
-        # Negative test: Metadata should not be set to a non-existent image
+        """Test setting metadata of a non existence image should fail"""
         meta = {'os_distro': 'alt1', 'os_version': 'alt2'}
         self.assertRaises(lib_exc.NotFound, self.client.set_image_metadata,
                           data_utils.rand_uuid(), meta)
@@ -63,8 +67,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('2154fd03-ab54-457c-8874-e6e3eb56e9cf')
     def test_set_nonexistent_image_metadata_item(self):
-        # Negative test: Metadata item should not be set to a
-        # nonexistent image
+        """Test setting metadata item of a non existence image should fail"""
         meta = {'os_distro': 'alt'}
         self.assertRaises(lib_exc.NotFound,
                           self.client.set_image_metadata_item,
@@ -74,8 +77,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('848e157f-6bcf-4b2e-a5dd-5124025a8518')
     def test_delete_nonexistent_image_metadata_item(self):
-        # Negative test: Shouldn't be able to delete metadata
-        # item from non-existent image
+        """Test deleting metadata item of a non existence image should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.delete_image_metadata_item,
                           data_utils.rand_uuid(), 'os_distro')
diff --git a/tempest/api/compute/images/test_images.py b/tempest/api/compute/images/test_images.py
index ef33685..91ce1f9 100644
--- a/tempest/api/compute/images/test_images.py
+++ b/tempest/api/compute/images/test_images.py
@@ -25,6 +25,8 @@
 
 
 class ImagesTestJSON(base.BaseV2ComputeTest):
+    """Test server images"""
+
     create_default_network = True
 
     @classmethod
@@ -48,6 +50,7 @@
 
     @decorators.idempotent_id('aa06b52b-2db5-4807-b218-9441f75d74e3')
     def test_delete_saving_image(self):
+        """Test deleting server image while it is in 'SAVING' state"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.addCleanup(self.servers_client.delete_server, server['id'])
         # wait for server active to avoid conflict when deleting server
@@ -74,6 +77,7 @@
 
     @decorators.idempotent_id('aaacd1d0-55a2-4ce8-818a-b5439df8adc9')
     def test_create_image_from_stopped_server(self):
+        """Test creating server image from stopped server"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.servers_client.stop_server(server['id'])
         waiters.wait_for_server_status(self.servers_client,
@@ -91,6 +95,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.pause,
                           'Pause is not available.')
     def test_create_image_from_paused_server(self):
+        """Test creating server image from paused server"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.servers_client.pause_server(server['id'])
         waiters.wait_for_server_status(self.servers_client,
@@ -109,6 +114,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.suspend,
                           'Suspend is not available.')
     def test_create_image_from_suspended_server(self):
+        """Test creating server image from suspended server"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.servers_client.suspend_server(server['id'])
         waiters.wait_for_server_status(self.servers_client,
diff --git a/tempest/api/compute/images/test_images_negative.py b/tempest/api/compute/images/test_images_negative.py
index 2400348..5ff2a6a 100644
--- a/tempest/api/compute/images/test_images_negative.py
+++ b/tempest/api/compute/images/test_images_negative.py
@@ -42,11 +42,12 @@
 
 
 class ImagesNegativeTestJSON(ImagesNegativeTestBase):
+    """Negative tests of server image"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6cd5a89d-5b47-46a7-93bc-3916f0d84973')
     def test_create_image_from_deleted_server(self):
-        # An image should not be created if the server instance is removed
+        """Check server image should not be created if the server is removed"""
         server = self.create_test_server(wait_until='ACTIVE')
 
         # Delete server before trying to create image
@@ -61,7 +62,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('82c5b0c4-9dbd-463c-872b-20c4755aae7f')
     def test_create_image_from_invalid_server(self):
-        # An image should not be created with invalid server id
+        """Check server image should not be created with invalid server id"""
         # Create a new image with invalid server id
         meta = {'image_type': 'test'}
         self.assertRaises(lib_exc.NotFound, self.create_image_from_server,
@@ -70,7 +71,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ec176029-73dc-4037-8d72-2e4ff60cf538')
     def test_create_image_specify_uuid_35_characters_or_less(self):
-        # Return an error if Image ID passed is 35 characters or less
+        """Check server image should not be created for invalid server id
+
+        Return an error if server id passed is 35 characters or less
+        """
         snapshot_name = data_utils.rand_name('test-snap')
         test_uuid = ('a' * 35)
         self.assertRaises(lib_exc.NotFound, self.client.create_image,
@@ -79,7 +83,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('36741560-510e-4cc2-8641-55fe4dfb2437')
     def test_create_image_specify_uuid_37_characters_or_more(self):
-        # Return an error if Image ID passed is 37 characters or more
+        """Check server image should not be created for invalid server id
+
+        Return an error if sever id passed is 37 characters or more
+        """
         snapshot_name = data_utils.rand_name('test-snap')
         test_uuid = ('a' * 37)
         self.assertRaises(lib_exc.NotFound, self.client.create_image,
@@ -87,20 +94,23 @@
 
 
 class ImagesDeleteNegativeTestJSON(ImagesNegativeTestBase):
+    """Negative tests of server image
+
+    Negative tests of server image with compute microversion less than 2.36.
+    """
     max_microversion = '2.35'
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('381acb65-785a-4942-94ce-d8f8c84f1f0f')
     def test_delete_image_with_invalid_image_id(self):
-        # An image should not be deleted with invalid image id
+        """Check an image should not be deleted with invalid image id"""
         self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           data_utils.rand_name('invalid'))
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('137aef61-39f7-44a1-8ddf-0adf82511701')
     def test_delete_non_existent_image(self):
-        # Return an error while trying to delete a non-existent image
-
+        """Check trying to delete a non-existent image should fail"""
         non_existent_image_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           non_existent_image_id)
@@ -108,13 +118,13 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e6e41425-af5c-4fe6-a4b5-7b7b963ffda5')
     def test_delete_image_blank_id(self):
-        # Return an error while trying to delete an image with blank Id
+        """Check trying to delete an image with blank id should fail"""
         self.assertRaises(lib_exc.NotFound, self.client.delete_image, '')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('924540c3-f1f1-444c-8f58-718958b6724e')
     def test_delete_image_non_hex_string_id(self):
-        # Return an error while trying to delete an image with non hex id
+        """Check trying to delete an image with non hex id should fail"""
         invalid_image_id = data_utils.rand_uuid()[:-1] + "j"
         self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           invalid_image_id)
@@ -122,13 +132,13 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('68e2c175-bd26-4407-ac0f-4ea9ce2139ea')
     def test_delete_image_negative_image_id(self):
-        # Return an error while trying to delete an image with negative id
+        """Check trying to delete an image with negative id should fail"""
         self.assertRaises(lib_exc.NotFound, self.client.delete_image, -1)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b340030d-82cd-4066-a314-c72fb7c59277')
     def test_delete_image_with_id_over_character_limit(self):
-        # Return an error while trying to delete image with id over limit
+        """Check trying to delete image with id over limit should fail"""
         invalid_image_id = data_utils.rand_uuid() + "1"
         self.assertRaises(lib_exc.NotFound, self.client.delete_image,
                           invalid_image_id)
diff --git a/tempest/api/compute/images/test_images_oneserver.py b/tempest/api/compute/images/test_images_oneserver.py
index b811421..23f8326 100644
--- a/tempest/api/compute/images/test_images_oneserver.py
+++ b/tempest/api/compute/images/test_images_oneserver.py
@@ -22,6 +22,7 @@
 
 
 class ImagesOneServerTestJSON(base.BaseV2ComputeTest):
+    """Test server images API"""
 
     @classmethod
     def resource_setup(cls):
@@ -54,6 +55,7 @@
 
     @decorators.idempotent_id('3731d080-d4c5-4872-b41a-64d0d0021314')
     def test_create_delete_image(self):
+        """Test create/delete server image"""
         if self.is_requested_microversion_compatible('2.35'):
             MIN_DISK = 'minDisk'
             MIN_RAM = 'minRam'
@@ -93,6 +95,7 @@
 
     @decorators.idempotent_id('3b7c6fe4-dfe7-477c-9243-b06359db51e6')
     def test_create_image_specify_multibyte_character_image_name(self):
+        """Test creating server image with multibyte character image name"""
         # prefix character is:
         # http://unicode.org/cldr/utility/character.jsp?a=20A1
 
diff --git a/tempest/api/compute/images/test_images_oneserver_negative.py b/tempest/api/compute/images/test_images_oneserver_negative.py
index 37f9be3..0296220 100644
--- a/tempest/api/compute/images/test_images_oneserver_negative.py
+++ b/tempest/api/compute/images/test_images_oneserver_negative.py
@@ -30,6 +30,8 @@
 
 
 class ImagesOneServerNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of server images"""
+
     create_default_network = True
 
     def tearDown(self):
@@ -87,7 +89,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('55d1d38c-dd66-4933-9c8e-7d92aeb60ddc')
     def test_create_image_specify_invalid_metadata(self):
-        # Return an error when creating image with invalid metadata
+        """Test creating server image with invalid metadata should fail"""
         meta = {'': ''}
         self.assertRaises(lib_exc.BadRequest, self.create_image_from_server,
                           self.server_id, metadata=meta)
@@ -95,7 +97,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('3d24d11f-5366-4536-bd28-cff32b748eca')
     def test_create_image_specify_metadata_over_limits(self):
-        # Return an error when creating image with meta data over 255 chars
+        """Test creating server image with metadata over 255 should fail"""
         meta = {'a' * 256: 'b' * 256}
         self.assertRaises(lib_exc.BadRequest, self.create_image_from_server,
                           self.server_id, metadata=meta)
@@ -103,8 +105,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0460efcf-ee88-4f94-acef-1bf658695456')
     def test_create_second_image_when_first_image_is_being_saved(self):
-        # Disallow creating another image when first image is being saved
+        """Test creating another server image when first image is being saved
 
+        Creating another server image when first image is being saved is
+        not allowed.
+        """
         # Create first snapshot
         image = self.create_image_from_server(self.server_id)
         self.addCleanup(self._reset_server)
@@ -123,8 +128,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('084f0cbc-500a-4963-8a4e-312905862581')
     def test_create_image_specify_name_over_character_limit(self):
-        # Return an error if snapshot name over 255 characters is passed
-
+        """Test creating server image with image name over 255 should fail"""
         snapshot_name = ('a' * 256)
         self.assertRaises(lib_exc.BadRequest,
                           self.compute_images_client.create_image,
@@ -133,8 +137,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0894954d-2db2-4195-a45b-ffec0bc0187e')
     def test_delete_image_that_is_not_yet_active(self):
-        # Return an error while trying to delete an image what is creating
-
+        """Test deleting a non-active server image should fail"""
         image = self.create_image_from_server(self.server_id)
         if api_version_utils.compare_version_header_to_response(
             "OpenStack-API-Version", "compute 2.45", image.response, "lt"):
diff --git a/tempest/api/compute/images/test_list_image_filters.py b/tempest/api/compute/images/test_list_image_filters.py
index 2ac7de3..7930c67 100644
--- a/tempest/api/compute/images/test_list_image_filters.py
+++ b/tempest/api/compute/images/test_list_image_filters.py
@@ -31,6 +31,8 @@
 
 
 class ListImageFiltersTestJSON(base.BaseV2ComputeTest):
+    """Test listing server images with compute microversion less than 2.36"""
+
     max_microversion = '2.35'
 
     @classmethod
@@ -129,8 +131,11 @@
 
     @decorators.idempotent_id('a3f5b513-aeb3-42a9-b18e-f091ef73254d')
     def test_list_images_filter_by_status(self):
-        # The list of images should contain only images with the
-        # provided status
+        """Test listing server images filtered by image status
+
+        The list of images should contain only images with the
+        provided image status.
+        """
         params = {'status': 'ACTIVE'}
         images = self.client.list_images(**params)['images']
 
@@ -140,8 +145,11 @@
 
     @decorators.idempotent_id('33163b73-79f5-4d07-a7ea-9213bcc468ff')
     def test_list_images_filter_by_name(self):
-        # List of all images should contain the expected images filtered
-        # by name
+        """Test listing server images filtered by image name
+
+        The list of images should contain only images with the
+        provided image name.
+        """
         params = {'name': self.image1['name']}
         images = self.client.list_images(**params)['images']
 
@@ -153,7 +161,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.snapshot,
                           'Snapshotting is not available.')
     def test_list_images_filter_by_server_id(self):
-        # The images should contain images filtered by server id
+        """Test listing images filtered by server id
+
+        The list of images should contain only images with the
+        provided server id.
+        """
         params = {'server': self.server1['id']}
         images = self.client.list_images(**params)['images']
 
@@ -169,7 +181,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.snapshot,
                           'Snapshotting is not available.')
     def test_list_images_filter_by_server_ref(self):
-        # The list of servers should be filtered by server ref
+        """Test listing images filtered by server link href
+
+        The list of images should contain only images with the
+        provided server link href.
+        """
         server_links = self.server2['links']
 
         # Try all server link types
@@ -188,7 +204,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.snapshot,
                           'Snapshotting is not available.')
     def test_list_images_filter_by_type(self):
-        # The list of servers should be filtered by image type
+        """Test listing images filtered by image type
+
+        The list of images should contain only images with the
+        provided image type.
+        """
         params = {'type': 'snapshot'}
         images = self.client.list_images(**params)['images']
 
@@ -202,13 +222,22 @@
 
     @decorators.idempotent_id('3a484ca9-67ba-451e-b494-7fcf28d32d62')
     def test_list_images_limit_results(self):
-        # Verify only the expected number of results are returned
+        """Test listing images with limited count
+
+        If we use limit=1 when listing images, then only 1 image should be
+        returned.
+        """
         params = {'limit': '1'}
         images = self.client.list_images(**params)['images']
         self.assertEqual(1, len([x for x in images if 'id' in x]))
 
     @decorators.idempotent_id('18bac3ae-da27-436c-92a9-b22474d13aab')
     def test_list_images_filter_by_changes_since(self):
+        """Test listing images filtered by changes-since
+
+        The list of images should contain only images updated since the
+        provided changes-since value.
+        """
         # Verify only updated images are returned in the detailed list
 
         # Becoming ACTIVE will modify the updated time
@@ -220,8 +249,11 @@
 
     @decorators.idempotent_id('9b0ea018-6185-4f71-948a-a123a107988e')
     def test_list_images_with_detail_filter_by_status(self):
-        # Detailed list of all images should only contain images
-        # with the provided status
+        """Test listing server images details filtered by image status
+
+        The list of images should contain only images with the
+        provided image status.
+        """
         params = {'status': 'ACTIVE'}
         images = self.client.list_images(detail=True, **params)['images']
 
@@ -231,8 +263,11 @@
 
     @decorators.idempotent_id('644ea267-9bd9-4f3b-af9f-dffa02396a17')
     def test_list_images_with_detail_filter_by_name(self):
-        # Detailed list of all images should contain the expected
-        # images filtered by name
+        """Test listing server images details filtered by image name
+
+        The list of images should contain only images with the
+        provided image name.
+        """
         params = {'name': self.image1['name']}
         images = self.client.list_images(detail=True, **params)['images']
 
@@ -242,8 +277,11 @@
 
     @decorators.idempotent_id('ba2fa9a9-b672-47cc-b354-3b4c0600e2cb')
     def test_list_images_with_detail_limit_results(self):
-        # Verify only the expected number of results (with full details)
-        # are returned
+        """Test listing images details with limited count
+
+        If we use limit=1 when listing images with full details, then only 1
+        image should be returned.
+        """
         params = {'limit': '1'}
         images = self.client.list_images(detail=True, **params)['images']
         self.assertEqual(1, len(images))
@@ -252,7 +290,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.snapshot,
                           'Snapshotting is not available.')
     def test_list_images_with_detail_filter_by_server_ref(self):
-        # Detailed list of servers should be filtered by server ref
+        """Test listing images details filtered by server link href
+
+        The list of images should contain only images with the
+        provided server link href.
+        """
         server_links = self.server2['links']
 
         # Try all server link types
@@ -271,7 +313,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.snapshot,
                           'Snapshotting is not available.')
     def test_list_images_with_detail_filter_by_type(self):
-        # The detailed list of servers should be filtered by image type
+        """Test listing images details filtered by image type
+
+        The list of images should contain only images with the
+        provided image type.
+        """
         params = {'type': 'snapshot'}
         images = self.client.list_images(detail=True, **params)['images']
         self.client.show_image(self.image_ref)
@@ -286,8 +332,11 @@
 
     @decorators.idempotent_id('7d439e18-ac2e-4827-b049-7e18004712c4')
     def test_list_images_with_detail_filter_by_changes_since(self):
-        # Verify an update image is returned
+        """Test listing images details filtered by changes-since
 
+        The list of images should contain only images updated since the
+        provided changes-since value.
+        """
         # Becoming ACTIVE will modify the updated time
         # Filter by the image's created time
         params = {'changes-since': self.image1['created']}
diff --git a/tempest/api/compute/images/test_list_image_filters_negative.py b/tempest/api/compute/images/test_list_image_filters_negative.py
index 81c59f9..f77da4b 100644
--- a/tempest/api/compute/images/test_list_image_filters_negative.py
+++ b/tempest/api/compute/images/test_list_image_filters_negative.py
@@ -22,6 +22,12 @@
 
 
 class ListImageFiltersNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of listing images using compute images API
+
+    Negative tests of listing images using compute images API with
+    microversion less than 2.36.
+    """
+
     max_microversion = '2.35'
 
     @classmethod
@@ -39,7 +45,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('391b0440-432c-4d4b-b5da-c5096aa247eb')
     def test_get_nonexistent_image(self):
-        # Check raises a NotFound
+        """Test getting a non existent image should fail"""
         nonexistent_image = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.show_image,
                           nonexistent_image)
diff --git a/tempest/api/compute/images/test_list_images.py b/tempest/api/compute/images/test_list_images.py
index cbb65bb..4dc23a7 100644
--- a/tempest/api/compute/images/test_list_images.py
+++ b/tempest/api/compute/images/test_list_images.py
@@ -21,6 +21,8 @@
 
 
 class ListImagesTestJSON(base.BaseV2ComputeTest):
+    """Test listing server images with compute microversion less than 2.36"""
+
     max_microversion = '2.35'
 
     @classmethod
@@ -37,20 +39,26 @@
 
     @decorators.idempotent_id('490d0898-e12a-463f-aef0-c50156b9f789')
     def test_get_image(self):
-        # Returns the correct details for a single image
+        """Test getting the correct details for a single server image"""
         image = self.client.show_image(self.image_ref)['image']
         self.assertEqual(self.image_ref, image['id'])
 
     @decorators.idempotent_id('fd51b7f4-d4a3-4331-9885-866658112a6f')
     def test_list_images(self):
-        # The list of all images should contain the image
+        """Test listing server images
+
+        The list of all images should contain the image
+        """
         images = self.client.list_images()['images']
         found = [i for i in images if i['id'] == self.image_ref]
         self.assertNotEmpty(found)
 
     @decorators.idempotent_id('9f94cb6b-7f10-48c5-b911-a0b84d7d4cd6')
     def test_list_images_with_detail(self):
-        # Detailed list of all images should contain the expected images
+        """Test listing server images with detail
+
+        Detailed list of all images should contain the expected images
+        """
         images = self.client.list_images(detail=True)['images']
         found = [i for i in images if i['id'] == self.image_ref]
         self.assertNotEmpty(found)
diff --git a/tempest/api/compute/keypairs/test_keypairs.py b/tempest/api/compute/keypairs/test_keypairs.py
index 66abb21..8df2e84 100644
--- a/tempest/api/compute/keypairs/test_keypairs.py
+++ b/tempest/api/compute/keypairs/test_keypairs.py
@@ -19,11 +19,16 @@
 
 
 class KeyPairsV2TestJSON(base.BaseKeypairTest):
+    """Test keypairs API with compute microversion less than 2.2"""
+
     max_microversion = '2.1'
 
     @decorators.idempotent_id('1d1dbedb-d7a0-432a-9d09-83f543c3c19b')
     def test_keypairs_create_list_delete(self):
-        # Keypairs created should be available in the response list
+        """Test create/list/delete keypairs
+
+        Keypairs created should be available in the response list
+        """
         # Create 3 keypairs
         key_list = list()
         for _ in range(3):
@@ -48,7 +53,7 @@
 
     @decorators.idempotent_id('6c1d3123-4519-4742-9194-622cb1714b7d')
     def test_keypair_create_delete(self):
-        # Keypair should be created, verified and deleted
+        """Test create/delete keypair"""
         k_name = data_utils.rand_name('keypair')
         keypair = self.create_keypair(k_name)
         key_name = keypair['name']
@@ -58,7 +63,7 @@
 
     @decorators.idempotent_id('a4233d5d-52d8-47cc-9a25-e1864527e3df')
     def test_get_keypair_detail(self):
-        # Keypair should be created, Got details by name and deleted
+        """Test getting keypair detail by keypair name"""
         k_name = data_utils.rand_name('keypair')
         self.create_keypair(k_name)
         keypair_detail = self.keypairs_client.show_keypair(k_name)['keypair']
@@ -68,7 +73,7 @@
 
     @decorators.idempotent_id('39c90c6a-304a-49dd-95ec-2366129def05')
     def test_keypair_create_with_pub_key(self):
-        # Keypair should be created with a given public key
+        """Test creating keypair with a given public key"""
         k_name = data_utils.rand_name('keypair')
         pub_key = ("ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCs"
                    "Ne3/1ILNCqFyfYWDeTKLD6jEXC2OQHLmietMWW+/vd"
diff --git a/tempest/api/compute/keypairs/test_keypairs_negative.py b/tempest/api/compute/keypairs/test_keypairs_negative.py
index 81635ca..40bea3f 100644
--- a/tempest/api/compute/keypairs/test_keypairs_negative.py
+++ b/tempest/api/compute/keypairs/test_keypairs_negative.py
@@ -21,10 +21,12 @@
 
 
 class KeyPairsNegativeTestJSON(base.BaseKeypairTest):
+    """Negative tests of keypairs API"""
+
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('29cca892-46ae-4d48-bc32-8fe7e731eb81')
     def test_keypair_create_with_invalid_pub_key(self):
-        # Keypair should not be created with a non RSA public key
+        """Test keypair should not be created with a non RSA public key"""
         pub_key = "ssh-rsa JUNK nova@ubuntu"
         self.assertRaises(lib_exc.BadRequest,
                           self.create_keypair, pub_key=pub_key)
@@ -32,7 +34,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7cc32e47-4c42-489d-9623-c5e2cb5a2fa5')
     def test_keypair_delete_nonexistent_key(self):
-        # Non-existent key deletion should throw a proper error
+        """Test non-existent key deletion should throw a proper error"""
         k_name = data_utils.rand_name("keypair-non-existent")
         self.assertRaises(lib_exc.NotFound,
                           self.keypairs_client.delete_keypair,
@@ -41,7 +43,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('dade320e-69ca-42a9-ba4a-345300f127e0')
     def test_create_keypair_with_empty_public_key(self):
-        # Keypair should not be created with an empty public key
+        """Test keypair should not be created with an empty public key"""
         pub_key = ' '
         self.assertRaises(lib_exc.BadRequest, self.create_keypair,
                           pub_key=pub_key)
@@ -49,7 +51,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('fc100c19-2926-4b9c-8fdc-d0589ee2f9ff')
     def test_create_keypair_when_public_key_bits_exceeds_maximum(self):
-        # Keypair should not be created when public key bits are too long
+        """Test keypair should not be created when public key are too long"""
         pub_key = 'ssh-rsa ' + 'A' * 2048 + ' openstack@ubuntu'
         self.assertRaises(lib_exc.BadRequest, self.create_keypair,
                           pub_key=pub_key)
@@ -57,7 +59,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0359a7f1-f002-4682-8073-0c91e4011b7c')
     def test_create_keypair_with_duplicate_name(self):
-        # Keypairs with duplicate names should not be created
+        """Test keypairs with duplicate names should not be created"""
         k_name = data_utils.rand_name('keypair')
         self.keypairs_client.create_keypair(name=k_name)
         # Now try the same keyname to create another key
@@ -68,14 +70,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1398abe1-4a84-45fb-9294-89f514daff00')
     def test_create_keypair_with_empty_name_string(self):
-        # Keypairs with name being an empty string should not be created
+        """Test keypairs with empty name should not be created"""
         self.assertRaises(lib_exc.BadRequest, self.create_keypair,
                           '')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('3faa916f-779f-4103-aca7-dc3538eee1b7')
     def test_create_keypair_with_long_keynames(self):
-        # Keypairs with name longer than 255 chars should not be created
+        """Test keypairs with name longer than 255 should not be created"""
         k_name = 'keypair-'.ljust(260, '0')
         self.assertRaises(lib_exc.BadRequest, self.create_keypair,
                           k_name)
@@ -83,7 +85,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('45fbe5e0-acb5-49aa-837a-ff8d0719db91')
     def test_create_keypair_invalid_name(self):
-        # Keypairs with name being an invalid name should not be created
+        """Test keypairs with an invalid name should not be created"""
         k_name = r'key_/.\@:'
         self.assertRaises(lib_exc.BadRequest, self.create_keypair,
                           k_name)
diff --git a/tempest/api/compute/keypairs/test_keypairs_v22.py b/tempest/api/compute/keypairs/test_keypairs_v22.py
index 1aff262..e229c37 100644
--- a/tempest/api/compute/keypairs/test_keypairs_v22.py
+++ b/tempest/api/compute/keypairs/test_keypairs_v22.py
@@ -18,6 +18,8 @@
 
 
 class KeyPairsV22TestJSON(test_keypairs.KeyPairsV2TestJSON):
+    """Test keypairs API with compute microversion greater than 2.1"""
+
     min_microversion = '2.2'
     max_microversion = 'latest'
 
@@ -43,9 +45,11 @@
 
     @decorators.idempotent_id('8726fa85-7f98-4b20-af9e-f710a4f3391c')
     def test_keypairsv22_create_list_show(self):
+        """Test create/list/show keypair"""
         self._test_keypairs_create_list_show()
 
     @decorators.idempotent_id('89d59d43-f735-441a-abcf-0601727f47b6')
     def test_keypairsv22_create_list_show_with_type(self):
+        """Test create/list/show keypair with keypair type"""
         keypair_type = 'x509'
         self._test_keypairs_create_list_show(keypair_type=keypair_type)
diff --git a/tempest/api/compute/limits/test_absolute_limits.py b/tempest/api/compute/limits/test_absolute_limits.py
index 8c2202e..c729069 100644
--- a/tempest/api/compute/limits/test_absolute_limits.py
+++ b/tempest/api/compute/limits/test_absolute_limits.py
@@ -18,6 +18,11 @@
 
 
 class AbsoluteLimitsTestJSON(base.BaseV2ComputeTest):
+    """Test compute absolute limits
+
+    Test compute absolute limits with compute microversion less than 2.57
+    """
+
     max_microversion = '2.56'
 
     @classmethod
@@ -27,12 +32,17 @@
 
     @decorators.idempotent_id('b54c66af-6ab6-4cf0-a9e5-a0cb58d75e0b')
     def test_absLimits_get(self):
+        """Test getting nova absolute limits"""
         # To check if all limits are present in the response (will be checked
         # by schema)
         self.client.show_limits()
 
 
 class AbsoluteLimitsV257TestJSON(base.BaseV2ComputeTest):
+    """Test compute absolute limits
+
+    Test compute absolute limits with compute microversion greater than 2.56
+    """
     min_microversion = '2.57'
     max_microversion = 'latest'
 
diff --git a/tempest/api/compute/limits/test_absolute_limits_negative.py b/tempest/api/compute/limits/test_absolute_limits_negative.py
index 500638a..de6a9b9 100644
--- a/tempest/api/compute/limits/test_absolute_limits_negative.py
+++ b/tempest/api/compute/limits/test_absolute_limits_negative.py
@@ -20,6 +20,7 @@
 
 
 class AbsoluteLimitsNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of nova absolute limits"""
 
     def setUp(self):
         # NOTE(mriedem): Avoid conflicts with os-quota-class-sets tests.
@@ -34,7 +35,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('215cd465-d8ae-49c9-bf33-9c911913a5c8')
     def test_max_metadata_exceed_limit(self):
-        # We should not create vm with metadata over maxServerMeta limit
+        """Test creating server with metadata over limit should fail
+
+        We should not create server with metadata over maxServerMeta limit
+        """
         # Get max limit value
         limits = self.client.show_limits()['limits']
         max_meta = limits['absolute']['maxServerMeta']
diff --git a/tempest/api/compute/security_groups/test_security_group_rules.py b/tempest/api/compute/security_groups/test_security_group_rules.py
index 4c99ea6..59848f6 100644
--- a/tempest/api/compute/security_groups/test_security_group_rules.py
+++ b/tempest/api/compute/security_groups/test_security_group_rules.py
@@ -18,6 +18,10 @@
 
 
 class SecurityGroupRulesTestJSON(base.BaseSecurityGroupsTest):
+    """Test security group rules API
+
+    Test security group rules API with compute microversion less than 2.36.
+    """
 
     @classmethod
     def setup_clients(cls):
@@ -55,8 +59,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('850795d7-d4d3-4e55-b527-a774c0123d3a')
     def test_security_group_rules_create(self):
-        # Positive test: Creation of Security Group rule
-        # should be successful
+        """Test creating security group rules"""
         # Creating a Security Group to add rules to it
         security_group = self.create_security_group()
         securitygroup_id = security_group['id']
@@ -72,10 +75,7 @@
 
     @decorators.idempotent_id('7a01873e-3c38-4f30-80be-31a043cfe2fd')
     def test_security_group_rules_create_with_optional_cidr(self):
-        # Positive test: Creation of Security Group rule
-        # with optional argument cidr
-        # should be successful
-
+        """Test creating security group rules with optional field cidr"""
         # Creating a Security Group to add rules to it
         security_group = self.create_security_group()
         parent_group_id = security_group['id']
@@ -94,10 +94,7 @@
 
     @decorators.idempotent_id('7f5d2899-7705-4d4b-8458-4505188ffab6')
     def test_security_group_rules_create_with_optional_group_id(self):
-        # Positive test: Creation of Security Group rule
-        # with optional argument group_id
-        # should be successful
-
+        """Test creating security group rules with optional field group id"""
         # Creating a Security Group to add rules to it
         security_group = self.create_security_group()
         parent_group_id = security_group['id']
@@ -122,8 +119,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('a6154130-5a55-4850-8be4-5e9e796dbf17')
     def test_security_group_rules_list(self):
-        # Positive test: Created Security Group rules should be
-        # in the list of all rules
+        """Test listing security group rules"""
         # Creating a Security Group to add rules to it
         security_group = self.create_security_group()
         securitygroup_id = security_group['id']
@@ -159,7 +155,7 @@
 
     @decorators.idempotent_id('fc5c5acf-2091-43a6-a6ae-e42760e9ffaf')
     def test_security_group_rules_delete_when_peer_group_deleted(self):
-        # Positive test:rule will delete when peer group deleting
+        """Test security group rule gets deleted when peer group is deleted"""
         # Creating a Security Group to add rules to it
         security_group = self.create_security_group()
         sg1_id = security_group['id']
diff --git a/tempest/api/compute/security_groups/test_security_group_rules_negative.py b/tempest/api/compute/security_groups/test_security_group_rules_negative.py
index 8283aae..3d000ca 100644
--- a/tempest/api/compute/security_groups/test_security_group_rules_negative.py
+++ b/tempest/api/compute/security_groups/test_security_group_rules_negative.py
@@ -20,6 +20,11 @@
 
 
 class SecurityGroupRulesNegativeTestJSON(base.BaseSecurityGroupsTest):
+    """Negative tests of security group rules API
+
+    Negative tests of security group rules API with compute microversion
+    less than 2.36.
+    """
 
     @classmethod
     def setup_clients(cls):
@@ -29,8 +34,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1d507e98-7951-469b-82c3-23f1e6b8c254')
     def test_create_security_group_rule_with_non_existent_id(self):
-        # Negative test: Creation of Security Group rule should FAIL
-        # with non existent Parent group id
+        """Test creating security group rule with non existent parent group
+
+        Negative test: Creation of security group rule should fail
+        with non existent parent group id.
+        """
         # Adding rules to the non existent Security Group id
         parent_group_id = self.generate_random_security_group_id()
         ip_protocol = 'tcp'
@@ -45,8 +53,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('2244d7e4-adb7-4ecb-9930-2d77e123ce4f')
     def test_create_security_group_rule_with_invalid_id(self):
-        # Negative test: Creation of Security Group rule should FAIL
-        # with Parent group id which is not integer
+        """Test creating security group rule with invalid parent group id
+
+        Negative test: Creation of security group rule should fail
+        with parent group id which is not integer.
+        """
         # Adding rules to the non int Security Group id
         parent_group_id = data_utils.rand_name('non_int_id')
         ip_protocol = 'tcp'
@@ -61,7 +72,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8bd56d02-3ffa-4d67-9933-b6b9a01d6089')
     def test_create_security_group_rule_duplicate(self):
-        # Negative test: Create Security Group rule duplicate should fail
+        """Test creating duplicate security group rule should fail"""
         # Creating a Security Group to add rule to it
         sg = self.create_security_group()
         # Adding rules to the created Security Group
@@ -85,8 +96,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('84c81249-9f6e-439c-9bbf-cbb0d2cddbdf')
     def test_create_security_group_rule_with_invalid_ip_protocol(self):
-        # Negative test: Creation of Security Group rule should FAIL
-        # with invalid ip_protocol
+        """Test creating security group rule with invalid ip protocol
+
+        Negative test: Creation of security group rule should fail
+        with invalid ip_protocol.
+        """
         # Creating a Security Group to add rule to it
         sg = self.create_security_group()
         # Adding rules to the created Security Group
@@ -104,8 +118,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('12bbc875-1045-4f7a-be46-751277baedb9')
     def test_create_security_group_rule_with_invalid_from_port(self):
-        # Negative test: Creation of Security Group rule should FAIL
-        # with invalid from_port
+        """Test creating security group rule with invalid from_port
+
+        Negative test: Creation of security group rule should fail
+        with invalid from_port.
+        """
         # Creating a Security Group to add rule to it
         sg = self.create_security_group()
         # Adding rules to the created Security Group
@@ -122,8 +139,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ff88804d-144f-45d1-bf59-dd155838a43a')
     def test_create_security_group_rule_with_invalid_to_port(self):
-        # Negative test: Creation of Security Group rule should FAIL
-        # with invalid to_port
+        """Test creating security group rule with invalid to_port
+
+        Negative test: Creation of security group rule should fail
+        with invalid to_port.
+        """
         # Creating a Security Group to add rule to it
         sg = self.create_security_group()
         # Adding rules to the created Security Group
@@ -140,8 +160,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('00296fa9-0576-496a-ae15-fbab843189e0')
     def test_create_security_group_rule_with_invalid_port_range(self):
-        # Negative test: Creation of Security Group rule should FAIL
-        # with invalid port range.
+        """Test creating security group rule with invalid port range
+
+        Negative test: Creation of security group rule should fail
+        with invalid port range.
+        """
         # Creating a Security Group to add rule to it.
         sg = self.create_security_group()
         # Adding a rule to the created Security Group
@@ -158,8 +181,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('56fddcca-dbb8-4494-a0db-96e9f869527c')
     def test_delete_security_group_rule_with_non_existent_id(self):
-        # Negative test: Deletion of Security Group rule should be FAIL
-        # with non existent id
+        """Test deleting non existent security group rule should fail"""
         non_existent_rule_id = self.generate_random_security_group_id()
         self.assertRaises(lib_exc.NotFound,
                           self.rules_client.delete_security_group_rule,
diff --git a/tempest/api/compute/security_groups/test_security_groups.py b/tempest/api/compute/security_groups/test_security_groups.py
index 62d5bea..671a779 100644
--- a/tempest/api/compute/security_groups/test_security_groups.py
+++ b/tempest/api/compute/security_groups/test_security_groups.py
@@ -21,6 +21,7 @@
 
 
 class SecurityGroupsTestJSON(base.BaseSecurityGroupsTest):
+    """Test security groups API with compute microversion less than 2.36"""
 
     @classmethod
     def setup_clients(cls):
@@ -30,7 +31,10 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('eb2b087d-633d-4d0d-a7bd-9e6ba35b32de')
     def test_security_groups_create_list_delete(self):
-        # Positive test:Should return the list of Security Groups
+        """Test create/list/delete security groups
+
+        Positive test: Should return the list of security groups.
+        """
         # Create 3 Security Groups
         security_group_list = []
         for _ in range(3):
@@ -60,9 +64,11 @@
 
     @decorators.idempotent_id('ecc0da4a-2117-48af-91af-993cca39a615')
     def test_security_group_create_get_delete(self):
-        # Security Group should be created, fetched and deleted
-        # with char space between name along with
-        # leading and trailing spaces
+        """Test create/get/delete security group
+
+        Security group should be created, fetched and deleted
+        with char space between name along with leading and trailing spaces.
+        """
         s_name = ' %s ' % data_utils.rand_name('securitygroup ')
         securitygroup = self.create_security_group(name=s_name)
         securitygroup_name = securitygroup['name']
@@ -80,8 +86,11 @@
 
     @decorators.idempotent_id('fe4abc0d-83f5-4c50-ad11-57a1127297a2')
     def test_server_security_groups(self):
-        # Checks that security groups may be added and linked to a server
-        # and not deleted if the server is active.
+        """Test adding security groups to a server
+
+        Checks that security groups may be added and linked to a server
+        and not deleted if the server is active.
+        """
         # Create a couple security groups that we will use
         # for the server resource this test creates
         sg = self.create_security_group()
@@ -121,7 +130,7 @@
 
     @decorators.idempotent_id('7d4e1d3c-3209-4d6d-b020-986304ebad1f')
     def test_update_security_groups(self):
-        # Update security group name and description
+        """Test updating security group name and description"""
         # Create a security group
         securitygroup = self.create_security_group()
         securitygroup_id = securitygroup['id']
@@ -139,6 +148,11 @@
 
     @decorators.idempotent_id('79517d60-535a-438f-af3d-e6feab1cbea7')
     def test_list_security_groups_by_server(self):
+        """Test listing security groups by server
+
+        Create security groups and add them to a server, then list security
+        groups by server, the added security groups should be in the list.
+        """
         # Create a couple security groups that we will use
         # for the server resource this test creates
         sg = self.create_security_group()
diff --git a/tempest/api/compute/security_groups/test_security_groups_negative.py b/tempest/api/compute/security_groups/test_security_groups_negative.py
index 9c44bb2..4607112 100644
--- a/tempest/api/compute/security_groups/test_security_groups_negative.py
+++ b/tempest/api/compute/security_groups/test_security_groups_negative.py
@@ -25,6 +25,11 @@
 
 
 class SecurityGroupsNegativeTestJSON(base.BaseSecurityGroupsTest):
+    """Negative tests of security groups API
+
+    Negative tests of security groups API with compute microversion
+    less than 2.36.
+    """
 
     @classmethod
     def setup_clients(cls):
@@ -34,8 +39,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('673eaec1-9b3e-48ed-bdf1-2786c1b9661c')
     def test_security_group_get_nonexistent_group(self):
-        # Negative test:Should not be able to GET the details
-        # of non-existent Security Group
+        """Test getting non existent security group details should fail"""
         non_exist_id = self.generate_random_security_group_id()
         self.assertRaises(lib_exc.NotFound, self.client.show_security_group,
                           non_exist_id)
@@ -45,8 +49,12 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1759c3cb-b0fc-44b7-86ce-c99236be911d')
     def test_security_group_create_with_invalid_group_name(self):
-        # Negative test: Security Group should not be created with group name
-        # as an empty string/with white spaces/chars more than 255
+        """Test creating security group with invalid group name should fail
+
+        Negative test: Security group should not be created with group name
+        as an empty string, or group name with white spaces, or group name
+        with chars more than 255.
+        """
         s_description = data_utils.rand_name('description')
         # Create Security Group with empty string as group name
         self.assertRaises(lib_exc.BadRequest,
@@ -67,9 +75,12 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('777b6f14-aca9-4758-9e84-38783cfa58bc')
     def test_security_group_create_with_invalid_group_description(self):
-        # Negative test: Security Group should not be created with description
-        # longer than 255 chars. Empty description is allowed by the API
-        # reference, however.
+        """Test creating security group with invalid group description
+
+        Negative test: Security group should not be created with description
+        longer than 255 chars. Empty description is allowed by the API
+        reference, however.
+        """
         s_name = data_utils.rand_name('securitygroup')
         # Create Security Group with group description longer than 255 chars
         s_description = 'description-'.ljust(260, '0')
@@ -82,8 +93,7 @@
                       "Neutron allows duplicate names for security groups")
     @decorators.attr(type=['negative'])
     def test_security_group_create_with_duplicate_name(self):
-        # Negative test:Security Group with duplicate name should not
-        # be created
+        """Test creating security group with duplicate name should fail"""
         s_name = data_utils.rand_name('securitygroup')
         s_description = data_utils.rand_name('description')
         self.create_security_group(name=s_name, description=s_description)
@@ -95,7 +105,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('36a1629f-c6da-4a26-b8b8-55e7e5d5cd58')
     def test_delete_the_default_security_group(self):
-        # Negative test:Deletion of the "default" Security Group should Fail
+        """Test deleting "default" security group should fail"""
         default_security_group_id = None
         body = self.client.list_security_groups()['security_groups']
         for i in range(len(body)):
@@ -110,7 +120,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6727c00b-214c-4f9e-9a52-017ac3e98411')
     def test_delete_nonexistent_security_group(self):
-        # Negative test:Deletion of a non-existent Security Group should fail
+        """Test deleting non existent security group should fail"""
         non_exist_id = self.generate_random_security_group_id()
         self.assertRaises(lib_exc.NotFound,
                           self.client.delete_security_group, non_exist_id)
@@ -118,8 +128,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1438f330-8fa4-4aeb-8a94-37c250106d7f')
     def test_delete_security_group_without_passing_id(self):
-        # Negative test:Deletion of a Security Group with out passing ID
-        # should Fail
+        """Test deleting security group passing empty group id should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.delete_security_group, '')
 
@@ -128,7 +137,7 @@
                       "Neutron does not check the security group ID")
     @decorators.attr(type=['negative'])
     def test_update_security_group_with_invalid_sg_id(self):
-        # Update security_group with invalid sg_id should fail
+        """Test updating security group with invalid group id should fail"""
         s_name = data_utils.rand_name('sg')
         s_description = data_utils.rand_name('description')
         # Create a non int sg_id
@@ -142,7 +151,7 @@
                       "Neutron does not check the security group name")
     @decorators.attr(type=['negative'])
     def test_update_security_group_with_invalid_sg_name(self):
-        # Update security_group with invalid sg_name should fail
+        """Test updating security group to invalid group name should fail"""
         securitygroup = self.create_security_group()
         securitygroup_id = securitygroup['id']
         # Update Security Group with group name longer than 255 chars
@@ -156,7 +165,7 @@
                       "Neutron does not check the security group description")
     @decorators.attr(type=['negative'])
     def test_update_security_group_with_invalid_sg_des(self):
-        # Update security_group with invalid sg_des should fail
+        """Test updating security group to invalid description should fail"""
         securitygroup = self.create_security_group()
         securitygroup_id = securitygroup['id']
         # Update Security Group with group description longer than 255 chars
@@ -168,7 +177,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('27edee9c-873d-4da6-a68a-3c256efebe8f')
     def test_update_non_existent_security_group(self):
-        # Update a non-existent Security Group should Fail
+        """Test updating a non existent security group should fail"""
         non_exist_id = self.generate_random_security_group_id()
         s_name = data_utils.rand_name('sg')
         s_description = data_utils.rand_name('description')
diff --git a/tempest/api/compute/servers/test_attach_interfaces.py b/tempest/api/compute/servers/test_attach_interfaces.py
index c1af6c7..0601bbe 100644
--- a/tempest/api/compute/servers/test_attach_interfaces.py
+++ b/tempest/api/compute/servers/test_attach_interfaces.py
@@ -99,6 +99,7 @@
 
 
 class AttachInterfacesTestJSON(AttachInterfacesTestBase):
+    """Test attaching interfaces"""
 
     def wait_for_port_detach(self, port_id):
         """Waits for the port's device_id to be unset.
@@ -230,6 +231,7 @@
     @decorators.idempotent_id('73fe8f02-590d-4bf1-b184-e9ca81065051')
     @utils.services('network')
     def test_create_list_show_delete_interfaces_by_network_port(self):
+        """Test create/list/show/delete interfaces by network port"""
         server, ifs, _ = self._create_server_get_interfaces()
         interface_count = len(ifs)
         self.assertGreater(interface_count, 0)
@@ -262,6 +264,7 @@
     @decorators.idempotent_id('d290c06c-f5b3-11e7-8ec8-002293781009')
     @utils.services('network')
     def test_create_list_show_delete_interfaces_by_fixed_ip(self):
+        """Test create/list/show/delete interfaces by fixed ip"""
         # NOTE(zhufl) By default only project that is admin or network owner
         # or project with role advsvc is authorised to create interfaces with
         # fixed-ip, so if we don't create network for each project, do not
@@ -290,7 +293,7 @@
 
     @decorators.idempotent_id('2f3a0127-95c7-4977-92d2-bc5aec602fb4')
     def test_reassign_port_between_servers(self):
-        """Tests the following:
+        """Tests reassigning port between servers
 
         1. Create a port in Neutron.
         2. Create two servers in Nova.
@@ -343,12 +346,15 @@
 
 
 class AttachInterfacesUnderV243Test(AttachInterfacesTestBase):
+    """Test attaching interfaces with compute microversion less than 2.44"""
+
     max_microversion = '2.43'
 
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('c7e0e60b-ee45-43d0-abeb-8596fd42a2f9')
     @utils.services('network')
     def test_add_remove_fixed_ip(self):
+        """Test adding and removing fixed ip from server"""
         # NOTE(zhufl) By default only project that is admin or network owner
         # or project with role advsvc is authorised to add interfaces with
         # fixed-ip, so if we don't create network for each project, do not
diff --git a/tempest/api/compute/servers/test_availability_zone.py b/tempest/api/compute/servers/test_availability_zone.py
index 36828d6..d239149 100644
--- a/tempest/api/compute/servers/test_availability_zone.py
+++ b/tempest/api/compute/servers/test_availability_zone.py
@@ -27,6 +27,6 @@
 
     @decorators.idempotent_id('a8333aa2-205c-449f-a828-d38c2489bf25')
     def test_get_availability_zone_list_with_non_admin_user(self):
-        # List of availability zone with non-administrator user
+        """List of availability zone with non-administrator user"""
         availability_zone = self.client.list_availability_zones()
         self.assertNotEmpty(availability_zone['availabilityZoneInfo'])
diff --git a/tempest/api/compute/servers/test_create_server.py b/tempest/api/compute/servers/test_create_server.py
index 4f0dbad..48f32a8 100644
--- a/tempest/api/compute/servers/test_create_server.py
+++ b/tempest/api/compute/servers/test_create_server.py
@@ -27,6 +27,11 @@
 
 
 class ServersTestJSON(base.BaseV2ComputeTest):
+    """Test creating server and verifying the server attributes
+
+    This is to create server booted from image and with disk_config 'AUTO'
+    """
+
     disk_config = 'AUTO'
     volume_backed = False
 
@@ -62,13 +67,12 @@
             disk_config=disk_config,
             adminPass=cls.password,
             volume_backed=cls.volume_backed)
-        cls.server = (cls.client.show_server(server_initial['id'])
-                      ['server'])
+        cls.server = cls.client.show_server(server_initial['id'])['server']
 
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('5de47127-9977-400a-936f-abcfbec1218f')
     def test_verify_server_details(self):
-        # Verify the specified server attributes are set correctly
+        """Verify the specified server attributes are set correctly"""
         self.assertEqual(self.accessIPv4, self.server['accessIPv4'])
         # NOTE(maurosr): See http://tools.ietf.org/html/rfc5952 (section 4)
         # Here we compare directly with the canonicalized format.
@@ -86,7 +90,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('9a438d88-10c6-4bcd-8b5b-5b6e25e1346f')
     def test_list_servers(self):
-        # The created server should be in the list of all servers
+        """The created server should be in the list of all servers"""
         body = self.client.list_servers()
         servers = body['servers']
         found = [i for i in servers if i['id'] == self.server['id']]
@@ -94,7 +98,7 @@
 
     @decorators.idempotent_id('585e934c-448e-43c4-acbf-d06a9b899997')
     def test_list_servers_with_detail(self):
-        # The created server should be in the detailed list of all servers
+        """The created server should be in the detailed list of all servers"""
         body = self.client.list_servers(detail=True)
         servers = body['servers']
         found = [i for i in servers if i['id'] == self.server['id']]
@@ -104,8 +108,11 @@
     @testtools.skipUnless(CONF.validation.run_validation,
                           'Instance validation tests are disabled.')
     def test_verify_created_server_vcpus(self):
-        # Verify that the number of vcpus reported by the instance matches
-        # the amount stated by the flavor
+        """The created server should have the same specification as the flavor
+
+        Verify that the number of vcpus reported by the instance matches
+        the amount stated by the flavor
+        """
         flavor = self.flavors_client.show_flavor(self.flavor_ref)['flavor']
         validation_resources = self.get_class_validation_resources(
             self.os_primary)
@@ -123,7 +130,7 @@
     @testtools.skipUnless(CONF.validation.run_validation,
                           'Instance validation tests are disabled.')
     def test_host_name_is_same_as_server_name(self):
-        # Verify the instance host name is the same as the server name
+        """Verify the instance host name is the same as the server name"""
         validation_resources = self.get_class_validation_resources(
             self.os_primary)
         linux_client = remote_client.RemoteClient(
@@ -145,6 +152,10 @@
 
 
 class ServersTestManualDisk(ServersTestJSON):
+    """Test creating server and verifying the server attributes
+
+    This is to create server booted from image and with disk_config 'MANUAL'
+    """
     disk_config = 'MANUAL'
 
     @classmethod
@@ -156,7 +167,11 @@
 
 
 class ServersTestBootFromVolume(ServersTestJSON):
-    """Run the `ServersTestJSON` tests with a volume backed VM"""
+    """Test creating server and verifying the server attributes
+
+    This is to create server booted from volume and with disk_config 'AUTO'
+    """
+    # Run the `ServersTestJSON` tests with a volume backed VM
     volume_backed = True
 
     @classmethod
diff --git a/tempest/api/compute/servers/test_create_server_multi_nic.py b/tempest/api/compute/servers/test_create_server_multi_nic.py
index d0f53fe..bd3f58d 100644
--- a/tempest/api/compute/servers/test_create_server_multi_nic.py
+++ b/tempest/api/compute/servers/test_create_server_multi_nic.py
@@ -24,6 +24,7 @@
 
 
 class ServersTestMultiNic(base.BaseV2ComputeTest):
+    """Test multiple networks in servers"""
 
     @classmethod
     def skip_checks(cls):
@@ -59,8 +60,11 @@
 
     @decorators.idempotent_id('0578d144-ed74-43f8-8e57-ab10dbf9b3c2')
     def test_verify_multiple_nics_order(self):
-        # Verify that the networks order given at the server creation is
-        # preserved within the server.
+        """Test verifying multiple networks order in server
+
+        The networks order given at the server creation is preserved within
+        the server.
+        """
         net1 = self._create_net_subnet_ret_net_from_cidr('19.80.0.0/24')
         net2 = self._create_net_subnet_ret_net_from_cidr('19.86.0.0/24')
 
@@ -95,6 +99,12 @@
 
     @decorators.idempotent_id('1678d144-ed74-43f8-8e57-ab10dbf9b3c2')
     def test_verify_duplicate_network_nics(self):
+        """Test multiple duplicate networks can be used to create server
+
+        Creating server with networks [net1, net2, net1], the server can
+        be created successfully and all three networks are in the server
+        addresses.
+        """
         # Verify that server creation does not fail when more than one nic
         # is created on the same network.
         net1 = self._create_net_subnet_ret_net_from_cidr('19.80.0.0/24')
diff --git a/tempest/api/compute/servers/test_delete_server.py b/tempest/api/compute/servers/test_delete_server.py
index a7db88a..ee25a22 100644
--- a/tempest/api/compute/servers/test_delete_server.py
+++ b/tempest/api/compute/servers/test_delete_server.py
@@ -26,6 +26,7 @@
 
 
 class DeleteServersTestJSON(base.BaseV2ComputeTest):
+    """Test deleting servers in various states"""
     create_default_network = True
 
     # NOTE: Server creations of each test class should be under 10
@@ -38,21 +39,21 @@
 
     @decorators.idempotent_id('9e6e0c87-3352-42f7-9faf-5d6210dbd159')
     def test_delete_server_while_in_building_state(self):
-        # Delete a server while it's VM state is Building
+        """Test deleting a server while it's VM state is Building"""
         server = self.create_test_server(wait_until='BUILD')
         self.client.delete_server(server['id'])
         waiters.wait_for_server_termination(self.client, server['id'])
 
     @decorators.idempotent_id('925fdfb4-5b13-47ea-ac8a-c36ae6fddb05')
     def test_delete_active_server(self):
-        # Delete a server while it's VM state is Active
+        """Test deleting a server while it's VM state is Active"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.client.delete_server(server['id'])
         waiters.wait_for_server_termination(self.client, server['id'])
 
     @decorators.idempotent_id('546d368c-bb6c-4645-979a-83ed16f3a6be')
     def test_delete_server_while_in_shutoff_state(self):
-        # Delete a server while it's VM state is Shutoff
+        """Test deleting a server while it's VM state is Shutoff"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.client.stop_server(server['id'])
         waiters.wait_for_server_status(self.client, server['id'], 'SHUTOFF')
@@ -63,7 +64,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.pause,
                           'Pause is not available.')
     def test_delete_server_while_in_pause_state(self):
-        # Delete a server while it's VM state is Pause
+        """Test deleting a server while it's VM state is Pause"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.client.pause_server(server['id'])
         waiters.wait_for_server_status(self.client, server['id'], 'PAUSED')
@@ -74,7 +75,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.suspend,
                           'Suspend is not available.')
     def test_delete_server_while_in_suspended_state(self):
-        # Delete a server while it's VM state is Suspended
+        """Test deleting a server while it's VM state is Suspended"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.client.suspend_server(server['id'])
         waiters.wait_for_server_status(self.client, server['id'], 'SUSPENDED')
@@ -85,7 +86,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.shelve,
                           'Shelve is not available.')
     def test_delete_server_while_in_shelved_state(self):
-        # Delete a server while it's VM state is Shelved
+        """Test deleting a server while it's VM state is Shelved"""
         server = self.create_test_server(wait_until='ACTIVE')
         compute.shelve_server(self.client, server['id'])
 
@@ -96,7 +97,7 @@
     @testtools.skipIf(not CONF.compute_feature_enabled.resize,
                       'Resize not available.')
     def test_delete_server_while_in_verify_resize_state(self):
-        # Delete a server while it's VM state is VERIFY_RESIZE
+        """Test deleting a server while it's VM state is VERIFY_RESIZE"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.client.resize_server(server['id'], self.flavor_ref_alt)
         waiters.wait_for_server_status(self.client, server['id'],
@@ -107,7 +108,7 @@
     @decorators.idempotent_id('d0f3f0d6-d9b6-4a32-8da4-23015dcab23c')
     @utils.services('volume')
     def test_delete_server_while_in_attached_volume(self):
-        # Delete a server while a volume is attached to it
+        """Test deleting a server while a volume is attached to it"""
         server = self.create_test_server(wait_until='ACTIVE')
 
         volume = self.create_volume()
diff --git a/tempest/api/compute/servers/test_device_tagging.py b/tempest/api/compute/servers/test_device_tagging.py
index 8879369..a7e2187 100644
--- a/tempest/api/compute/servers/test_device_tagging.py
+++ b/tempest/api/compute/servers/test_device_tagging.py
@@ -103,6 +103,7 @@
 
 
 class TaggedBootDevicesTest(DeviceTaggingBase):
+    """Test tagged boot device with compute microversion equals 2.32"""
 
     min_microversion = '2.32'
     # NOTE(mriedem): max_version looks odd but it's actually correct. Due to a
@@ -149,6 +150,16 @@
     @decorators.idempotent_id('a2e65a6c-66f1-4442-aaa8-498c31778d96')
     @utils.services('network', 'volume', 'image')
     def test_tagged_boot_devices(self):
+        """Test tagged boot devices
+
+        1. Create volumes
+        2. Create networks
+        3. Create subnets
+        4. Create ports
+        5. Create server, specifying tags for items in networks and
+           block_device_mapping_v2,
+        6. Verify tagged devices are in server via metadata service
+        """
         # Create volumes
         # The create_volume methods waits for the volumes to be available and
         # the base class will clean them up on tearDown.
@@ -300,11 +311,14 @@
 
 
 class TaggedBootDevicesTest_v242(TaggedBootDevicesTest):
+    """Test tagged boot devices with compute microversion greater than 2.41"""
+
     min_microversion = '2.42'
     max_microversion = 'latest'
 
 
 class TaggedAttachmentsTest(DeviceTaggingBase):
+    """Test tagged attachments with compute microversion greater than 2.48"""
 
     min_microversion = '2.49'
     max_microversion = 'latest'
@@ -342,6 +356,16 @@
     @decorators.idempotent_id('3e41c782-2a89-4922-a9d2-9a188c4e7c7c')
     @utils.services('network', 'volume', 'image')
     def test_tagged_attachment(self):
+        """Test tagged attachment
+
+        1. Create network
+        2. Create subnet
+        3. Create volume
+        4. Create server
+        5. Attach tagged networks and volume
+        6. Verify tagged devices are in server via metadata service
+        7. Detach tagged networks and volume
+        """
         # Create network
         net = self.networks_client.create_network(
             name=data_utils.rand_name(
diff --git a/tempest/api/compute/servers/test_disk_config.py b/tempest/api/compute/servers/test_disk_config.py
index 5b8e7ab..e5e051a 100644
--- a/tempest/api/compute/servers/test_disk_config.py
+++ b/tempest/api/compute/servers/test_disk_config.py
@@ -24,6 +24,8 @@
 
 
 class ServerDiskConfigTestJSON(base.BaseV2ComputeTest):
+    """Test disk config option of server"""
+
     create_default_network = True
 
     @classmethod
@@ -49,7 +51,7 @@
 
     @decorators.idempotent_id('bef56b09-2e8c-4883-a370-4950812f430e')
     def test_rebuild_server_with_manual_disk_config(self):
-        # A server should be rebuilt using the manual disk config option
+        """A server should be rebuilt using the manual disk config option"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.addCleanup(self.client.delete_server, server['id'])
         self._update_server_with_disk_config(server['id'],
@@ -68,7 +70,7 @@
 
     @decorators.idempotent_id('9c9fae77-4feb-402f-8450-bf1c8b609713')
     def test_rebuild_server_with_auto_disk_config(self):
-        # A server should be rebuilt using the auto disk config option
+        """A server should be rebuilt using the auto disk config option"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.addCleanup(self.client.delete_server, server['id'])
         self._update_server_with_disk_config(server['id'],
@@ -89,7 +91,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize not available.')
     def test_resize_server_from_manual_to_auto(self):
-        # A server should be resized from manual to auto disk config
+        """A server should be resized from manual to auto disk config"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.addCleanup(self.client.delete_server, server['id'])
         self._update_server_with_disk_config(server['id'],
@@ -105,7 +107,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize not available.')
     def test_resize_server_from_auto_to_manual(self):
-        # A server should be resized from auto to manual disk config
+        """A server should be resized from auto to manual disk config"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.addCleanup(self.client.delete_server, server['id'])
         self._update_server_with_disk_config(server['id'],
@@ -119,7 +121,7 @@
 
     @decorators.idempotent_id('5ef18867-358d-4de9-b3c9-94d4ba35742f')
     def test_update_server_from_auto_to_manual(self):
-        # A server should be updated from auto to manual disk config
+        """A server should be updated from auto to manual disk config"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.addCleanup(self.client.delete_server, server['id'])
         self._update_server_with_disk_config(server['id'],
diff --git a/tempest/api/compute/servers/test_instance_actions.py b/tempest/api/compute/servers/test_instance_actions.py
index 00837eb..5ab592a 100644
--- a/tempest/api/compute/servers/test_instance_actions.py
+++ b/tempest/api/compute/servers/test_instance_actions.py
@@ -19,6 +19,8 @@
 
 
 class InstanceActionsTestJSON(base.BaseV2ComputeTest):
+    """Test instance actions API"""
+
     create_default_network = True
 
     @classmethod
@@ -34,7 +36,7 @@
 
     @decorators.idempotent_id('77ca5cc5-9990-45e0-ab98-1de8fead201a')
     def test_list_instance_actions(self):
-        # List actions of the provided server
+        """Test listing actions of the provided server"""
         self.client.reboot_server(self.server['id'], type='HARD')
         waiters.wait_for_server_status(self.client,
                                        self.server['id'], 'ACTIVE')
@@ -47,7 +49,7 @@
 
     @decorators.idempotent_id('aacc71ca-1d70-4aa5-bbf6-0ff71470e43c')
     def test_get_instance_action(self):
-        # Get the action details of the provided server
+        """Test getting the action details of the provided server"""
         body = self.client.show_instance_action(
             self.server['id'], self.request_id)['instanceAction']
         self.assertEqual(self.server['id'], body['instance_uuid'])
@@ -55,6 +57,8 @@
 
 
 class InstanceActionsV221TestJSON(base.BaseV2ComputeTest):
+    """Test instance actions with compute microversion greater than 2.20"""
+
     create_default_network = True
 
     min_microversion = '2.21'
@@ -67,8 +71,11 @@
 
     @decorators.idempotent_id('0a0f85d4-10fa-41f6-bf80-a54fb4aa2ae1')
     def test_get_list_deleted_instance_actions(self):
+        """Test listing actions for deleted instance
 
-        # List actions of the deleted server
+        Listing actions for deleted instance should succeed and the returned
+        actions should contain 'create' and 'delete'.
+        """
         server = self.create_test_server(wait_until='ACTIVE')
         self.client.delete_server(server['id'])
         waiters.wait_for_server_termination(self.client, server['id'])
diff --git a/tempest/api/compute/servers/test_instance_actions_negative.py b/tempest/api/compute/servers/test_instance_actions_negative.py
index 4b5a2c3..dd2bf06 100644
--- a/tempest/api/compute/servers/test_instance_actions_negative.py
+++ b/tempest/api/compute/servers/test_instance_actions_negative.py
@@ -20,6 +20,8 @@
 
 
 class InstanceActionsNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of instance actions"""
+
     create_default_network = True
 
     @classmethod
@@ -35,7 +37,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('67e1fce6-7ec2-45c6-92d4-0a8f1a632910')
     def test_list_instance_actions_non_existent_server(self):
-        # List actions of the non-existent server id
+        """Test listing actions for non existent instance should fail"""
         non_existent_server_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.client.list_instance_actions,
@@ -44,6 +46,6 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0269f40a-6f18-456c-b336-c03623c897f1')
     def test_get_instance_action_invalid_request(self):
-        # Get the action details of the provided server with invalid request
+        """Test getting instance action with invalid request_id should fail"""
         self.assertRaises(lib_exc.NotFound, self.client.show_instance_action,
                           self.server['id'], '999')
diff --git a/tempest/api/compute/servers/test_list_server_filters.py b/tempest/api/compute/servers/test_list_server_filters.py
index 3dffd01..990dd52 100644
--- a/tempest/api/compute/servers/test_list_server_filters.py
+++ b/tempest/api/compute/servers/test_list_server_filters.py
@@ -26,6 +26,7 @@
 
 
 class ListServerFiltersTestJSON(base.BaseV2ComputeTest):
+    """Test listing servers filtered by specified attribute"""
 
     @classmethod
     def setup_credentials(cls):
@@ -71,7 +72,7 @@
     @testtools.skipUnless(CONF.compute.image_ref != CONF.compute.image_ref_alt,
                           "Need distinct images to run this test")
     def test_list_servers_filter_by_image(self):
-        # Filter the list of servers by image
+        """Filter the list of servers by image"""
         params = {'image': self.image_ref}
         body = self.client.list_servers(**params)
         servers = body['servers']
@@ -82,7 +83,7 @@
 
     @decorators.idempotent_id('573637f5-7325-47bb-9144-3476d0416908')
     def test_list_servers_filter_by_flavor(self):
-        # Filter the list of servers by flavor
+        """Filter the list of servers by flavor"""
         params = {'flavor': self.flavor_ref_alt}
         body = self.client.list_servers(**params)
         servers = body['servers']
@@ -93,7 +94,7 @@
 
     @decorators.idempotent_id('9b067a7b-7fee-4f6a-b29c-be43fe18fc5a')
     def test_list_servers_filter_by_server_name(self):
-        # Filter the list of servers by server name
+        """Filter the list of servers by server name"""
         params = {'name': self.s1_name}
         body = self.client.list_servers(**params)
         servers = body['servers']
@@ -104,7 +105,7 @@
 
     @decorators.idempotent_id('ca78e20e-fddb-4ce6-b7f7-bcbf8605e66e')
     def test_list_servers_filter_by_active_status(self):
-        # Filter the list of servers by server active status
+        """Filter the list of servers by server active status"""
         params = {'status': 'active'}
         body = self.client.list_servers(**params)
         servers = body['servers']
@@ -115,7 +116,7 @@
 
     @decorators.idempotent_id('451dbbb2-f330-4a9f-b0e1-5f5d2cb0f34c')
     def test_list_servers_filter_by_shutoff_status(self):
-        # Filter the list of servers by server shutoff status
+        """Filter the list of servers by server shutoff status"""
         params = {'status': 'shutoff'}
         self.client.stop_server(self.s1['id'])
         waiters.wait_for_server_status(self.client, self.s1['id'],
@@ -132,21 +133,30 @@
 
     @decorators.idempotent_id('614cdfc1-d557-4bac-915b-3e67b48eee76')
     def test_list_servers_filter_by_limit(self):
-        # Verify only the expected number of servers are returned
+        """Filter the list of servers by limit 1
+
+        Verify only the expected number of servers are returned (one server)
+        """
         params = {'limit': 1}
         servers = self.client.list_servers(**params)
         self.assertEqual(1, len([x for x in servers['servers'] if 'id' in x]))
 
     @decorators.idempotent_id('b1495414-2d93-414c-8019-849afe8d319e')
     def test_list_servers_filter_by_zero_limit(self):
-        # Verify only the expected number of servers are returned
+        """Filter the list of servers by limit 0
+
+        Verify only the expected number of servers are returned (no server)
+        """
         params = {'limit': 0}
         servers = self.client.list_servers(**params)
         self.assertEmpty(servers['servers'])
 
     @decorators.idempotent_id('37791bbd-90c0-4de0-831e-5f38cba9c6b3')
     def test_list_servers_filter_by_exceed_limit(self):
-        # Verify only the expected number of servers are returned
+        """Filter the list of servers by exceeded limit
+
+        Verify only the expected number of servers are returned (all servers)
+        """
         params = {'limit': 100000}
         servers = self.client.list_servers(**params)
         all_servers = self.client.list_servers()
@@ -157,7 +167,7 @@
     @testtools.skipUnless(CONF.compute.image_ref != CONF.compute.image_ref_alt,
                           "Need distinct images to run this test")
     def test_list_servers_detailed_filter_by_image(self):
-        # Filter the detailed list of servers by image
+        """"Filter the detailed list of servers by image"""
         params = {'image': self.image_ref}
         body = self.client.list_servers(detail=True, **params)
         servers = body['servers']
@@ -168,7 +178,7 @@
 
     @decorators.idempotent_id('80c574cc-0925-44ba-8602-299028357dd9')
     def test_list_servers_detailed_filter_by_flavor(self):
-        # Filter the detailed list of servers by flavor
+        """Filter the detailed list of servers by flavor"""
         params = {'flavor': self.flavor_ref_alt}
         body = self.client.list_servers(detail=True, **params)
         servers = body['servers']
@@ -179,7 +189,7 @@
 
     @decorators.idempotent_id('f9eb2b70-735f-416c-b260-9914ac6181e4')
     def test_list_servers_detailed_filter_by_server_name(self):
-        # Filter the detailed list of servers by server name
+        """Filter the detailed list of servers by server name"""
         params = {'name': self.s1_name}
         body = self.client.list_servers(detail=True, **params)
         servers = body['servers']
@@ -190,7 +200,7 @@
 
     @decorators.idempotent_id('de2612ab-b7dd-4044-b0b1-d2539601911f')
     def test_list_servers_detailed_filter_by_server_status(self):
-        # Filter the detailed list of servers by server status
+        """Filter the detailed list of servers by server status"""
         params = {'status': 'active'}
         body = self.client.list_servers(detail=True, **params)
         servers = body['servers']
@@ -204,6 +214,7 @@
 
     @decorators.idempotent_id('e9f624ee-92af-4562-8bec-437945a18dcb')
     def test_list_servers_filtered_by_name_wildcard(self):
+        """Filter the list of servers by part of server name"""
         # List all servers that contains '-instance' in name
         params = {'name': '-instance'}
         body = self.client.list_servers(**params)
@@ -226,6 +237,7 @@
 
     @decorators.idempotent_id('24a89b0c-0d55-4a28-847f-45075f19b27b')
     def test_list_servers_filtered_by_name_regex(self):
+        """Filter the list of servers by server name regular expression"""
         # list of regex that should match s1, s2 and s3
         regexes = [r'^.*\-instance\-[0-9]+$', r'^.*\-instance\-.*$']
         for regex in regexes:
@@ -250,7 +262,7 @@
 
     @decorators.idempotent_id('43a1242e-7b31-48d1-88f2-3f72aa9f2077')
     def test_list_servers_filtered_by_ip(self):
-        # Filter servers by ip
+        """Filter the list of servers by server ip address"""
         # Here should be listed 1 server
         if not self.fixed_network_name:
             msg = 'fixed_network_name needs to be configured to run this test'
@@ -284,22 +296,32 @@
         for ip in ip_list:
             self.assertNotIn(ip_list[ip], map(lambda x: x['id'], servers))
 
-    @decorators.skip_because(bug="1540645")
     @decorators.idempotent_id('a905e287-c35e-42f2-b132-d02b09f3654a')
     def test_list_servers_filtered_by_ip_regex(self):
-        # Filter servers by regex ip
-        # List all servers filtered by part of ip address.
-        # Here should be listed all servers
+        """Filter the list of servers by part of server ip address"""
         if not self.fixed_network_name:
             msg = 'fixed_network_name needs to be configured to run this test'
             raise self.skipException(msg)
-        self.s1 = self.client.show_server(self.s1['id'])['server']
-        addr_spec = self.s1['addresses'][self.fixed_network_name][0]
-        ip = addr_spec['addr'][0:-3]
+        # query addresses of the 3 servers
+        addrs = []
+        for s in [self.s1, self.s2, self.s3]:
+            s_show = self.client.show_server(s['id'])['server']
+            addr_spec = s_show['addresses'][self.fixed_network_name][0]
+            addrs.append(addr_spec['addr'])
+        # find common part of the 3 ip addresses
+        prefix = ''
+        addrs_len = [len(a) for a in addrs]
+        addrs_len.sort()
+        # iterate over the smallest length of an ip
+        for i in range(addrs_len[0]):
+            if not addrs[0][i] == addrs[1][i] == addrs[2][i]:
+                break
+            prefix += addrs[0][i]
+
         if addr_spec['version'] == 4:
-            params = {'ip': ip}
+            params = {'ip': prefix}
         else:
-            params = {'ip6': ip}
+            params = {'ip6': prefix}
         # capture all servers in case something goes wrong
         all_servers = self.client.list_servers(detail=True)
         body = self.client.list_servers(**params)
@@ -317,7 +339,10 @@
 
     @decorators.idempotent_id('67aec2d0-35fe-4503-9f92-f13272b867ed')
     def test_list_servers_detailed_limit_results(self):
-        # Verify only the expected number of detailed results are returned
+        """Filter the detailed list of servers by limit 1
+
+        Verify only the expected number of servers are returned (one server)
+        """
         params = {'limit': 1}
         servers = self.client.list_servers(detail=True, **params)
         self.assertEqual(1, len(servers['servers']))
diff --git a/tempest/api/compute/servers/test_list_servers_negative.py b/tempest/api/compute/servers/test_list_servers_negative.py
index b95db5c..3d55696 100644
--- a/tempest/api/compute/servers/test_list_servers_negative.py
+++ b/tempest/api/compute/servers/test_list_servers_negative.py
@@ -20,6 +20,8 @@
 
 
 class ListServersNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of listing servers"""
+
     create_default_network = True
 
     @classmethod
@@ -45,7 +47,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('24a26f1a-1ddc-4eea-b0d7-a90cc874ad8f')
     def test_list_servers_with_a_deleted_server(self):
-        # Verify deleted servers do not show by default in list servers
+        """Test that deleted servers do not show by default in list servers"""
         # List servers and verify server not returned
         body = self.client.list_servers()
         servers = body['servers']
@@ -56,7 +58,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ff01387d-c7ad-47b4-ae9e-64fa214638fe')
     def test_list_servers_by_non_existing_image(self):
-        # Listing servers for a non existing image returns empty list
+        """Test listing servers for a non existing image returns empty list"""
         body = self.client.list_servers(image='non_existing_image')
         servers = body['servers']
         self.assertEmpty(servers)
@@ -64,7 +66,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5913660b-223b-44d4-a651-a0fbfd44ca75')
     def test_list_servers_by_non_existing_flavor(self):
-        # Listing servers by non existing flavor returns empty list
+        """Test listing servers by non existing flavor returns empty list"""
         body = self.client.list_servers(flavor='non_existing_flavor')
         servers = body['servers']
         self.assertEmpty(servers)
@@ -72,7 +74,12 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e2c77c4a-000a-4af3-a0bd-629a328bde7c')
     def test_list_servers_by_non_existing_server_name(self):
-        # Listing servers for a non existent server name returns empty list
+        """Test listing servers for a non existent server name
+
+        Listing servers for a non existent server name should return empty
+        list.
+        """
+
         body = self.client.list_servers(name='non_existing_server_name')
         servers = body['servers']
         self.assertEmpty(servers)
@@ -80,9 +87,13 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('fcdf192d-0f74-4d89-911f-1ec002b822c4')
     def test_list_servers_status_non_existing(self):
-        # When invalid status is specified, up to microversion 2.37,
-        # an empty list is returned, and starting from microversion 2.38,
-        # a 400 error is returned in that case.
+        """Test listing servers with non existing status
+
+        When invalid status is specified, up to microversion 2.37,
+        an empty list is returned, and starting from microversion 2.38,
+        a 400 error is returned in that case.
+        """
+
         if self.is_requested_microversion_compatible('2.37'):
             body = self.client.list_servers(status='non_existing_status')
             servers = body['servers']
@@ -94,6 +105,12 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d47c17fb-eebd-4287-8e95-f20a7e627b18')
     def test_list_servers_by_limits_greater_than_actual_count(self):
+        """Test listing servers by limit greater than actual count
+
+        Listing servers by limit greater than actual count should return
+        all servers.
+        """
+
         # Gather the complete list of servers in the project for reference
         full_list = self.client.list_servers()['servers']
         # List servers by specifying a greater value for limit
@@ -104,21 +121,21 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('679bc053-5e70-4514-9800-3dfab1a380a6')
     def test_list_servers_by_limits_pass_string(self):
-        # Return an error if a string value is passed for limit
+        """Test listing servers by non-integer limit should fail"""
         self.assertRaises(lib_exc.BadRequest, self.client.list_servers,
                           limit='testing')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('62610dd9-4713-4ee0-8beb-fd2c1aa7f950')
     def test_list_servers_by_limits_pass_negative_value(self):
-        # Return an error if a negative value for limit is passed
+        """Test listing servers by negative limit should fail"""
         self.assertRaises(lib_exc.BadRequest, self.client.list_servers,
                           limit=-1)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('87d12517-e20a-4c9c-97b6-dd1628d6d6c9')
     def test_list_servers_by_changes_since_invalid_date(self):
-        # Return an error when invalid date format is passed
+        """Test listing servers by invalid changes-since format should fail"""
         params = {'changes-since': '2011/01/01'}
         self.assertRaises(lib_exc.BadRequest, self.client.list_servers,
                           **params)
@@ -126,7 +143,12 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('74745ad8-b346-45b5-b9b8-509d7447fc1f')
     def test_list_servers_by_changes_since_future_date(self):
-        # Return an empty list when a date in the future is passed.
+        """Test listing servers by a future changes-since date
+
+        Return an empty list when a date in the future is passed as
+        changes-since value.
+        """
+
         # updated_at field may haven't been set at the point in the boot
         # process where build_request still exists, so add
         # {'status': 'ACTIVE'} along with changes-since as filter.
@@ -138,7 +160,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('93055106-2d34-46fe-af68-d9ddbf7ee570')
     def test_list_servers_detail_server_is_deleted(self):
-        # Server details are not listed for a deleted server
+        """Test listing servers detail should not contain deleted server"""
         body = self.client.list_servers(detail=True)
         servers = body['servers']
         actual = [srv for srv in servers
diff --git a/tempest/api/compute/servers/test_multiple_create.py b/tempest/api/compute/servers/test_multiple_create.py
index dcadace..10c76bb 100644
--- a/tempest/api/compute/servers/test_multiple_create.py
+++ b/tempest/api/compute/servers/test_multiple_create.py
@@ -19,11 +19,15 @@
 
 
 class MultipleCreateTestJSON(base.BaseV2ComputeTest):
+    """Test creating multiple servers in one request"""
     create_default_network = True
 
     @decorators.idempotent_id('61e03386-89c3-449c-9bb1-a06f423fd9d1')
     def test_multiple_create(self):
-        # Creating server with min_count=2, 2 servers will be created.
+        """Test creating multiple servers in one request
+
+        Creating server with min_count=2, 2 servers will be created.
+        """
         tenant_network = self.get_tenant_network()
         body, servers = compute.create_test_server(
             self.os_primary,
@@ -40,8 +44,12 @@
 
     @decorators.idempotent_id('864777fb-2f1e-44e3-b5b9-3eb6fa84f2f7')
     def test_multiple_create_with_reservation_return(self):
-        # Creating multiple servers with return_reservation_id=True,
-        # reservation_id will be returned.
+        """Test creating multiple servers with return_reservation_id=True
+
+        Creating multiple servers with return_reservation_id=True,
+        reservation_id will be returned.
+        """
+
         body = self.create_test_server(wait_until='ACTIVE',
                                        min_count=1,
                                        max_count=2,
diff --git a/tempest/api/compute/servers/test_multiple_create_negative.py b/tempest/api/compute/servers/test_multiple_create_negative.py
index 6bdf83b..3a970dd 100644
--- a/tempest/api/compute/servers/test_multiple_create_negative.py
+++ b/tempest/api/compute/servers/test_multiple_create_negative.py
@@ -19,11 +19,12 @@
 
 
 class MultipleCreateNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of creating multiple servers in one request"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('daf29d8d-e928-4a01-9a8c-b129603f3fc0')
     def test_min_count_less_than_one(self):
-        # Creating server with min_count=0 should fail.
+        """Test creating server with min_count=0 should fail"""
         invalid_min_count = 0
         self.assertRaises(lib_exc.BadRequest, self.create_test_server,
                           min_count=invalid_min_count)
@@ -31,7 +32,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('999aa722-d624-4423-b813-0d1ac9884d7a')
     def test_min_count_non_integer(self):
-        # Creating server with non-integer min_count should fail.
+        """Test creating server with non-integer min_count should fail"""
         invalid_min_count = 2.5
         self.assertRaises(lib_exc.BadRequest, self.create_test_server,
                           min_count=invalid_min_count)
@@ -39,7 +40,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a6f9c2ab-e060-4b82-b23c-4532cb9390ff')
     def test_max_count_less_than_one(self):
-        # Creating server with max_count < 1 shoudld fail.
+        """Test creating server with max_count < 1 shoudld fail"""
         invalid_max_count = 0
         self.assertRaises(lib_exc.BadRequest, self.create_test_server,
                           max_count=invalid_max_count)
@@ -47,7 +48,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9c5698d1-d7af-4c80-b971-9d403135eea2')
     def test_max_count_non_integer(self):
-        # Creating server with non-integer max_count should fail.
+        """Test creating server with non-integer max_count should fail"""
         invalid_max_count = 2.5
         self.assertRaises(lib_exc.BadRequest, self.create_test_server,
                           max_count=invalid_max_count)
@@ -55,7 +56,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('476da616-f1ef-4271-a9b1-b9fc87727cdf')
     def test_max_count_less_than_min_count(self):
-        # Creating server with max_count less than min_count should fail.
+        """Test creating server with max_count < min_count should fail"""
         min_count = 3
         max_count = 2
         self.assertRaises(lib_exc.BadRequest, self.create_test_server,
diff --git a/tempest/api/compute/servers/test_novnc.py b/tempest/api/compute/servers/test_novnc.py
index 68e09e7..7931ca9 100644
--- a/tempest/api/compute/servers/test_novnc.py
+++ b/tempest/api/compute/servers/test_novnc.py
@@ -33,6 +33,8 @@
 
 
 class NoVNCConsoleTestJSON(base.BaseV2ComputeTest):
+    """Test novnc console"""
+
     create_default_network = True
 
     @classmethod
@@ -181,6 +183,7 @@
 
     @decorators.idempotent_id('c640fdff-8ab4-45a4-a5d8-7e6146cbd0dc')
     def test_novnc(self):
+        """Test accessing novnc console of server"""
         if self.use_get_remote_console:
             body = self.client.get_remote_console(
                 self.server['id'], console_type='novnc',
@@ -200,6 +203,11 @@
 
     @decorators.idempotent_id('f9c79937-addc-4aaa-9e0e-841eef02aeb7')
     def test_novnc_bad_token(self):
+        """Test accessing novnc console with bad token
+
+        Do the WebSockify HTTP Request to novnc proxy with a bad token,
+        the novnc proxy should reject the connection and closed it.
+        """
         if self.use_get_remote_console:
             body = self.client.get_remote_console(
                 self.server['id'], console_type='novnc',
diff --git a/tempest/api/compute/servers/test_server_actions.py b/tempest/api/compute/servers/test_server_actions.py
index d477be0..4db6987 100644
--- a/tempest/api/compute/servers/test_server_actions.py
+++ b/tempest/api/compute/servers/test_server_actions.py
@@ -34,6 +34,8 @@
 
 
 class ServerActionsTestJSON(base.BaseV2ComputeTest):
+    """Test server actions"""
+
     def setUp(self):
         # NOTE(afazekas): Normally we use the same server with all test cases,
         # but if it has an issue, we build a new one
@@ -84,6 +86,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.change_password,
                           'Change password not available.')
     def test_change_server_password(self):
+        """Test changing server's password
+
+        The server's password should be set to the provided password and
+        the user can authenticate with the new password.
+        """
         # Since this test messes with the password and makes the
         # server unreachable, it should create its own server
         validation_resources = self.get_test_validation_resources(
@@ -147,17 +154,24 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('2cb1baf6-ac8d-4429-bf0d-ba8a0ba53e32')
     def test_reboot_server_hard(self):
-        # The server should be power cycled
+        """Test hard rebooting server
+
+        The server should be power cycled.
+        """
         self._test_reboot_server('HARD')
 
     @decorators.skip_because(bug="1014647")
     @decorators.idempotent_id('4640e3ef-a5df-482e-95a1-ceeeb0faa84d')
     def test_reboot_server_soft(self):
-        # The server should be signaled to reboot gracefully
+        """Test soft rebooting server
+
+        The server should be signaled to reboot gracefully.
+        """
         self._test_reboot_server('SOFT')
 
     @decorators.idempotent_id('1d1c9104-1b0a-11e7-a3d4-fa163e65f5ce')
     def test_remove_server_all_security_groups(self):
+        """Test removing all security groups from server"""
         server = self.create_test_server(wait_until='ACTIVE')
 
         # Remove all Security group
@@ -232,12 +246,19 @@
 
     @decorators.idempotent_id('aaa6cdf3-55a7-461a-add9-1c8596b9a07c')
     def test_rebuild_server(self):
+        """Test rebuilding server
+
+        The server should be rebuilt using the provided image and data.
+        """
         self._test_rebuild_server()
 
     @decorators.idempotent_id('30449a88-5aff-4f9b-9866-6ee9b17f906d')
     def test_rebuild_server_in_stop_state(self):
-        # The server in stop state  should be rebuilt using the provided
-        # image and remain in SHUTOFF state
+        """Test rebuilding server in stop state
+
+        The server in stop state should be rebuilt using the provided
+        image and remain in SHUTOFF state.
+        """
         server = self.client.show_server(self.server_id)['server']
         old_image = server['image']['id']
         new_image = (self.image_ref_alt
@@ -274,6 +295,10 @@
     @decorators.idempotent_id('b68bd8d6-855d-4212-b59b-2e704044dace')
     @utils.services('volume')
     def test_rebuild_server_with_volume_attached(self):
+        """Test rebuilding server with volume attached
+
+        The volume should be attached to the instance after rebuild.
+        """
         # create a new volume and attach it to the server
         volume = self.create_volume()
 
@@ -333,6 +358,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize not available.')
     def test_resize_server_confirm(self):
+        """Test resizing server and then confirming"""
         self._test_resize_server_confirm(self.server_id, stop=False)
 
     @decorators.idempotent_id('e6c28180-7454-4b59-b188-0257af08a63b')
@@ -341,6 +367,7 @@
                           'Resize not available.')
     @utils.services('volume')
     def test_resize_volume_backed_server_confirm(self):
+        """Test resizing a volume backed server and then confirming"""
         # We have to create a new server that is volume-backed since the one
         # from setUp is not volume-backed.
         kwargs = {'volume_backed': True,
@@ -377,14 +404,18 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize not available.')
     def test_resize_server_confirm_from_stopped(self):
+        """Test resizing a stopped server and then confirming"""
         self._test_resize_server_confirm(self.server_id, stop=True)
 
     @decorators.idempotent_id('c03aab19-adb1-44f5-917d-c419577e9e68')
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize not available.')
     def test_resize_server_revert(self):
-        # The server's RAM and disk space should return to its original
-        # values after a resize is reverted
+        """Test resizing server and then reverting
+
+        The server's RAM and disk space should return to its original
+        values after a resize is reverted.
+        """
 
         self.client.resize_server(self.server_id, self.flavor_ref_alt)
         # NOTE(zhufl): Explicitly delete the server to get a new one for later
@@ -405,10 +436,13 @@
                           'Resize not available.')
     @utils.services('volume')
     def test_resize_server_revert_with_volume_attached(self):
-        # Tests attaching a volume to a server instance and then resizing
-        # the instance. Once the instance is resized, revert the resize which
-        # should move the instance and volume attachment back to the original
-        # compute host.
+        """Test resizing a volume attached server and then reverting
+
+        Tests attaching a volume to a server instance and then resizing
+        the instance. Once the instance is resized, revert the resize which
+        should move the instance and volume attachment back to the original
+        compute host.
+        """
 
         # Create a blank volume and attach it to the server created in setUp.
         volume = self.create_volume()
@@ -437,7 +471,14 @@
                           'Snapshotting not available, backup not possible.')
     @utils.services('image')
     def test_create_backup(self):
-        # Positive test:create backup successfully and rotate backups correctly
+        """Test creating server backup
+
+        1. create server backup1 with rotation=2, there are 1 backup.
+        2. create server backup2 with rotation=2, there are 2 backups.
+        3. create server backup3, due to the rotation is 2, the first one
+           (backup1) will be deleted, so now there are still 2 backups.
+        """
+
         # create the first and the second backup
 
         # Check if glance v1 is available to determine which client to use. We
@@ -563,8 +604,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.console_output,
                           'Console output not supported.')
     def test_get_console_output(self):
-        # Positive test:Should be able to GET the console output
-        # for a given server_id and number of lines
+        """Test getting console output for a server
+
+        Should be able to GET the console output for a given server_id and
+        number of lines.
+        """
 
         # This reboot is necessary for outputting some console log after
         # creating an instance backup. If an instance backup, the console
@@ -579,6 +623,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.console_output,
                           'Console output not supported.')
     def test_get_console_output_with_unlimited_size(self):
+        """Test getting server's console output with unlimited size
+
+        The console output lines length should be bigger than the one
+        of test_get_console_output.
+        """
         server = self.create_test_server(wait_until='ACTIVE')
 
         def _check_full_length_console_log():
@@ -597,8 +646,11 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.console_output,
                           'Console output not supported.')
     def test_get_console_output_server_id_in_shutoff_status(self):
-        # Positive test:Should be able to GET the console output
-        # for a given server_id in SHUTOFF status
+        """Test getting console output for a server in SHUTOFF status
+
+        Should be able to GET the console output for a given server_id
+        in SHUTOFF status.
+        """
 
         # NOTE: SHUTOFF is irregular status. To avoid test instability,
         #       one server is created only for this test without using
@@ -614,6 +666,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.pause,
                           'Pause is not available.')
     def test_pause_unpause_server(self):
+        """Test pausing and unpausing server"""
         self.client.pause_server(self.server_id)
         waiters.wait_for_server_status(self.client, self.server_id, 'PAUSED')
         self.client.unpause_server(self.server_id)
@@ -623,6 +676,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.suspend,
                           'Suspend is not available.')
     def test_suspend_resume_server(self):
+        """Test suspending and resuming server"""
         self.client.suspend_server(self.server_id)
         waiters.wait_for_server_status(self.client, self.server_id,
                                        'SUSPENDED')
@@ -634,6 +688,7 @@
                           'Shelve is not available.')
     @utils.services('image')
     def test_shelve_unshelve_server(self):
+        """Test shelving and unshelving server"""
         if CONF.image_feature_enabled.api_v2:
             glance_client = self.os_primary.image_client_v2
         elif CONF.image_feature_enabled.api_v1:
@@ -673,6 +728,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.pause,
                           'Pause is not available.')
     def test_shelve_paused_server(self):
+        """Test shelving a paused server"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.client.pause_server(server['id'])
         waiters.wait_for_server_status(self.client, server['id'], 'PAUSED')
@@ -682,6 +738,7 @@
 
     @decorators.idempotent_id('af8eafd4-38a7-4a4b-bdbc-75145a580560')
     def test_stop_start_server(self):
+        """Test stopping and starting server"""
         self.client.stop_server(self.server_id)
         waiters.wait_for_server_status(self.client, self.server_id, 'SHUTOFF')
         self.client.start_server(self.server_id)
@@ -689,6 +746,12 @@
 
     @decorators.idempotent_id('80a8094c-211e-440a-ab88-9e59d556c7ee')
     def test_lock_unlock_server(self):
+        """Test locking and unlocking server
+
+        Lock the server, and trying to stop it will fail because locked
+        server is not allowed to be stopped by non-admin user.
+        Then unlock the server, now the server can be stopped and started.
+        """
         # Lock the server,try server stop(exceptions throw),unlock it and retry
         self.client.lock_server(self.server_id)
         self.addCleanup(self.client.unlock_server, self.server_id)
@@ -714,6 +777,10 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.vnc_console,
                           'VNC Console feature is disabled.')
     def test_get_vnc_console(self):
+        """Test getting vnc console from a server
+
+        The returned vnc console url should be in valid format.
+        """
         if self.is_requested_microversion_compatible('2.5'):
             body = self.client.get_vnc_console(
                 self.server_id, type='novnc')['console']
diff --git a/tempest/api/compute/servers/test_server_addresses.py b/tempest/api/compute/servers/test_server_addresses.py
index c936ce5..5a3f5d0 100644
--- a/tempest/api/compute/servers/test_server_addresses.py
+++ b/tempest/api/compute/servers/test_server_addresses.py
@@ -19,6 +19,7 @@
 
 
 class ServerAddressesTestJSON(base.BaseV2ComputeTest):
+    """Test server addresses"""
     create_default_network = True
 
     @classmethod
@@ -36,8 +37,10 @@
     @decorators.idempotent_id('6eb718c0-02d9-4d5e-acd1-4e0c269cef39')
     @utils.services('network')
     def test_list_server_addresses(self):
-        # All public and private addresses for
-        # a server should be returned
+        """Test listing server address
+
+        All public and private addresses for a server should be returned.
+        """
 
         addresses = self.client.list_addresses(self.server['id'])['addresses']
 
@@ -51,8 +54,11 @@
     @decorators.idempotent_id('87bbc374-5538-4f64-b673-2b0e4443cc30')
     @utils.services('network')
     def test_list_server_addresses_by_network(self):
-        # Providing a network type should filter
-        # the addresses return by that type
+        """Test listing server addresses filtered by network addresses
+
+        Providing a network address should filter the addresses same with
+        the specified one.
+        """
 
         addresses = self.client.list_addresses(self.server['id'])['addresses']
 
diff --git a/tempest/api/compute/servers/test_server_addresses_negative.py b/tempest/api/compute/servers/test_server_addresses_negative.py
index f33c6d9..e7444d2 100644
--- a/tempest/api/compute/servers/test_server_addresses_negative.py
+++ b/tempest/api/compute/servers/test_server_addresses_negative.py
@@ -20,6 +20,7 @@
 
 
 class ServerAddressesNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of listing server addresses"""
     create_default_network = True
 
     @classmethod
@@ -36,7 +37,7 @@
     @decorators.idempotent_id('02c3f645-2d2e-4417-8525-68c0407d001b')
     @utils.services('network')
     def test_list_server_addresses_invalid_server_id(self):
-        # List addresses request should fail if server id not in system
+        """List addresses request should fail if server id not in system"""
         self.assertRaises(lib_exc.NotFound, self.client.list_addresses,
                           '999')
 
@@ -44,7 +45,7 @@
     @decorators.idempotent_id('a2ab5144-78c0-4942-a0ed-cc8edccfd9ba')
     @utils.services('network')
     def test_list_server_addresses_by_network_neg(self):
-        # List addresses by network should fail if network name not valid
+        """List addresses by network should fail if network name not valid"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.list_addresses_by_network,
                           self.server['id'], 'invalid')
diff --git a/tempest/api/compute/servers/test_server_group.py b/tempest/api/compute/servers/test_server_group.py
index 4b5efaa..4c0d021 100644
--- a/tempest/api/compute/servers/test_server_group.py
+++ b/tempest/api/compute/servers/test_server_group.py
@@ -82,18 +82,18 @@
 
     @decorators.idempotent_id('5dc57eda-35b7-4af7-9e5f-3c2be3d2d68b')
     def test_create_delete_server_group_with_affinity_policy(self):
-        # Create and Delete the server-group with affinity policy
+        """Test Create/Delete the server-group with affinity policy"""
         self._create_delete_server_group(self.policy)
 
     @decorators.idempotent_id('3645a102-372f-4140-afad-13698d850d23')
     def test_create_delete_server_group_with_anti_affinity_policy(self):
-        # Create and Delete the server-group with anti-affinity policy
+        """Test Create/Delete the server-group with anti-affinity policy"""
         policy = ['anti-affinity']
         self._create_delete_server_group(policy)
 
     @decorators.idempotent_id('154dc5a4-a2fe-44b5-b99e-f15806a4a113')
     def test_create_delete_multiple_server_groups_with_same_name_policy(self):
-        # Create and Delete the server-groups with same name and same policy
+        """Test Create/Delete the server-groups with same name and policy"""
         server_groups = []
         server_group_name = data_utils.rand_name('server-group')
         for _ in range(0, 2):
@@ -108,14 +108,14 @@
 
     @decorators.idempotent_id('b3545034-dd78-48f0-bdc2-a4adfa6d0ead')
     def test_show_server_group(self):
-        # Get the server-group
+        """Test getting the server-group detail"""
         body = self.client.show_server_group(
             self.created_server_group['id'])['server_group']
         self.assertEqual(self.created_server_group, body)
 
     @decorators.idempotent_id('d4874179-27b4-4d7d-80e4-6c560cdfe321')
     def test_list_server_groups(self):
-        # List the server-group
+        """Test listing the server-groups"""
         body = self.client.list_server_groups()['server_groups']
         self.assertIn(self.created_server_group, body)
 
@@ -124,7 +124,7 @@
         compute.is_scheduler_filter_enabled("ServerGroupAffinityFilter"),
         'ServerGroupAffinityFilter is not available.')
     def test_create_server_with_scheduler_hint_group(self):
-        # Create a server with the scheduler hint "group".
+        """Test creating a server with the scheduler hint 'group'"""
         hints = {'group': self.created_server_group['id']}
         server = self.create_test_server(scheduler_hints=hints,
                                          wait_until='ACTIVE')
diff --git a/tempest/api/compute/servers/test_server_metadata.py b/tempest/api/compute/servers/test_server_metadata.py
index 9d87e1c..9f93e76 100644
--- a/tempest/api/compute/servers/test_server_metadata.py
+++ b/tempest/api/compute/servers/test_server_metadata.py
@@ -14,13 +14,26 @@
 #    under the License.
 
 from tempest.api.compute import base
+from tempest import config
 from tempest.lib import decorators
 
+CONF = config.CONF
 
+
+# TODO(stephenfin): Remove these tests once the nova Ussuri branch goes EOL
 class ServerMetadataTestJSON(base.BaseV2ComputeTest):
+    """Test server metadata"""
+
     create_default_network = True
 
     @classmethod
+    def skip_checks(cls):
+        super(ServerMetadataTestJSON, cls).skip_checks()
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise cls.skipException(
+                'Metadata is read-only on non-Xen-based deployments.')
+
+    @classmethod
     def setup_clients(cls):
         super(ServerMetadataTestJSON, cls).setup_clients()
         cls.client = cls.servers_client
@@ -37,7 +50,10 @@
 
     @decorators.idempotent_id('479da087-92b3-4dcf-aeb3-fd293b2d14ce')
     def test_list_server_metadata(self):
-        # All metadata key/value pairs for a server should be returned
+        """Test listing server metadata
+
+        All metadata key/value pairs for a server should be returned.
+        """
         resp_metadata = (self.client.list_server_metadata(self.server['id'])
                          ['metadata'])
 
@@ -47,7 +63,10 @@
 
     @decorators.idempotent_id('211021f6-21de-4657-a68f-908878cfe251')
     def test_set_server_metadata(self):
-        # The server's metadata should be replaced with the provided values
+        """Test setting server metadata
+
+        The server's metadata should be replaced with the provided values
+        """
         # Create a new set of metadata for the server
         req_metadata = {'meta2': 'data2', 'meta3': 'data3'}
         self.client.set_server_metadata(self.server['id'], req_metadata)
@@ -60,8 +79,10 @@
 
     @decorators.idempotent_id('344d981e-0c33-4997-8a5d-6c1d803e4134')
     def test_update_server_metadata(self):
-        # The server's metadata values should be updated to the
-        # provided values
+        """Test updating server metadata
+
+        The server's metadata values should be updated to the provided values.
+        """
         meta = {'key1': 'alt1', 'key3': 'value3'}
         self.client.update_server_metadata(self.server['id'], meta)
 
@@ -73,8 +94,11 @@
 
     @decorators.idempotent_id('0f58d402-e34a-481d-8af8-b392b17426d9')
     def test_update_metadata_empty_body(self):
-        # The original metadata should not be lost if empty metadata body is
-        # passed
+        """Test updating server metadata to empty values
+
+        The original server metadata should not be lost if empty metadata
+        body is passed.
+        """
         meta = {}
         self.client.update_server_metadata(self.server['id'], meta)
         resp_metadata = (self.client.list_server_metadata(self.server['id'])
@@ -84,15 +108,19 @@
 
     @decorators.idempotent_id('3043c57d-7e0e-49a6-9a96-ad569c265e6a')
     def test_get_server_metadata_item(self):
-        # The value for a specific metadata key should be returned
+        """Test getting specific server metadata item"""
         meta = self.client.show_server_metadata_item(self.server['id'],
                                                      'key2')['meta']
         self.assertEqual('value2', meta['key2'])
 
     @decorators.idempotent_id('58c02d4f-5c67-40be-8744-d3fa5982eb1c')
     def test_set_server_metadata_item(self):
-        # The item's value should be updated to the provided value
-        # Update the metadata value
+        """Test updating specific server metadata item
+
+        The metadata item's value should be updated to the provided value.
+        """
+
+        # Update the metadata value.
         meta = {'nova': 'alt'}
         self.client.set_server_metadata_item(self.server['id'], 'nova', meta)
 
@@ -104,7 +132,10 @@
 
     @decorators.idempotent_id('127642d6-4c7b-4486-b7cd-07265a378658')
     def test_delete_server_metadata_item(self):
-        # The metadata value/key pair should be deleted from the server
+        """Test deleting server metadata item
+
+        The metadata value/key pair should be deleted from the server.
+        """
         self.client.delete_server_metadata_item(self.server['id'], 'key1')
 
         # Verify the metadata item has been removed
diff --git a/tempest/api/compute/servers/test_server_metadata_negative.py b/tempest/api/compute/servers/test_server_metadata_negative.py
index 5688af1..a697b95 100644
--- a/tempest/api/compute/servers/test_server_metadata_negative.py
+++ b/tempest/api/compute/servers/test_server_metadata_negative.py
@@ -14,12 +14,17 @@
 #    under the License.
 
 from tempest.api.compute import base
+from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
 from tempest.lib import exceptions as lib_exc
 
+CONF = config.CONF
+
 
 class ServerMetadataNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of server metadata"""
+
     create_default_network = True
 
     @classmethod
@@ -36,6 +41,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('fe114a8f-3a57-4eff-9ee2-4e14628df049')
     def test_server_create_metadata_key_too_long(self):
+        """Test creating server with too long metadata key should fail"""
         # Attempt to start a server with a meta-data key that is > 255
         # characters
 
@@ -52,7 +58,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('92431555-4d8b-467c-b95b-b17daa5e57ff')
     def test_create_server_metadata_blank_key(self):
-        # Blank key should trigger an error.
+        """Test creating server with blank metadata key should fail"""
         meta = {'': 'data1'}
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
@@ -61,6 +67,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('4d9cd7a3-2010-4b41-b8fe-3bbf0b169466')
     def test_server_metadata_non_existent_server(self):
+        """Test getting metadata item for a non existent server should fail"""
         # GET on a non-existent server should not succeed
         non_existent_server_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
@@ -71,7 +78,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f408e78e-3066-4097-9299-3b0182da812e')
     def test_list_server_metadata_non_existent_server(self):
-        # List metadata on a non-existent server should not succeed
+        """Test listing metadata for a non existent server should fail"""
         non_existent_server_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.client.list_server_metadata,
@@ -80,8 +87,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0025fbd6-a4ba-4cde-b8c2-96805dcfdabc')
     def test_wrong_key_passed_in_body(self):
-        # Raise BadRequest if key in uri does not match
-        # the key passed in body.
+        """Test setting server metadata item with wrong key in body
+
+        Raise BadRequest if key in uri does not match the key passed in body.
+        """
         meta = {'testkey': 'testvalue'}
         self.assertRaises(lib_exc.BadRequest,
                           self.client.set_server_metadata_item,
@@ -90,7 +99,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0df38c2a-3d4e-4db5-98d8-d4d9fa843a12')
     def test_set_metadata_non_existent_server(self):
-        # Set metadata on a non-existent server should not succeed
+        """Test setting metadata for a non existent server should fail"""
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise self.skipException(
+                'Metadata is read-only on non-Xen-based deployments.')
+
         non_existent_server_id = data_utils.rand_uuid()
         meta = {'meta1': 'data1'}
         self.assertRaises(lib_exc.NotFound,
@@ -101,7 +114,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('904b13dc-0ef2-4e4c-91cd-3b4a0f2f49d8')
     def test_update_metadata_non_existent_server(self):
-        # An update should not happen for a non-existent server
+        """Test updating metadata for a non existent server should fail"""
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise self.skipException(
+                'Metadata is read-only on non-Xen-based deployments.')
+
         non_existent_server_id = data_utils.rand_uuid()
         meta = {'key1': 'value1', 'key2': 'value2'}
         self.assertRaises(lib_exc.NotFound,
@@ -112,7 +129,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a452f38c-05c2-4b47-bd44-a4f0bf5a5e48')
     def test_update_metadata_with_blank_key(self):
-        # Blank key should trigger an error
+        """Test updating server metadata to blank key should fail"""
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise self.skipException(
+                'Metadata is read-only on non-Xen-based deployments.')
+
         meta = {'': 'data1'}
         self.assertRaises(lib_exc.BadRequest,
                           self.client.update_server_metadata,
@@ -121,7 +142,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6bbd88e1-f8b3-424d-ba10-ae21c45ada8d')
     def test_delete_metadata_non_existent_server(self):
-        # Should not be able to delete metadata item from a non-existent server
+        """Test deleting metadata item from a non existent server
+
+        Should not be able to delete metadata item from a non-existent server.
+        """
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise self.skipException(
+                'Metadata is read-only on non-Xen-based deployments.')
+
         non_existent_server_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.client.delete_server_metadata_item,
@@ -131,9 +159,15 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d8c0a210-a5c3-4664-be04-69d96746b547')
     def test_metadata_items_limit(self):
-        # A 403 Forbidden or 413 Overlimit (old behaviour) exception
-        # will be raised while exceeding metadata items limit for
-        # tenant.
+        """Test set/update server metadata over limit should fail
+
+        A 403 Forbidden or 413 Overlimit (old behaviour) exception
+        will be raised while exceeding metadata items limit for project.
+        """
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise self.skipException(
+                'Metadata is read-only on non-Xen-based deployments.')
+
         quota_set = self.quotas_client.show_quota_set(
             self.tenant_id)['quota_set']
         quota_metadata = quota_set['metadata_items']
@@ -157,8 +191,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('96100343-7fa9-40d8-80fa-d29ef588ce1c')
     def test_set_server_metadata_blank_key(self):
-        # Raise a bad request error for blank key.
-        # set_server_metadata will replace all metadata with new value
+        """Test setting server metadata with blank key should fail"""
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise self.skipException(
+                'Metadata is read-only on non-Xen-based deployments.')
+
         meta = {'': 'data1'}
         self.assertRaises(lib_exc.BadRequest,
                           self.client.set_server_metadata,
@@ -167,8 +204,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('64a91aee-9723-4863-be44-4c9d9f1e7d0e')
     def test_set_server_metadata_missing_metadata(self):
-        # Raise a bad request error for a missing metadata field
-        # set_server_metadata will replace all metadata with new value
+        """Test setting server metadata without metadata field should fail"""
+        if not CONF.compute_feature_enabled.xenapi_apis:
+            raise self.skipException(
+                'Metadata is read-only on non-Xen-based deployments.')
+
         meta = {'meta1': 'data1'}
         self.assertRaises(lib_exc.BadRequest,
                           self.client.set_server_metadata,
diff --git a/tempest/api/compute/servers/test_server_password.py b/tempest/api/compute/servers/test_server_password.py
index 7b31ede..f61d4fd 100644
--- a/tempest/api/compute/servers/test_server_password.py
+++ b/tempest/api/compute/servers/test_server_password.py
@@ -19,6 +19,8 @@
 
 
 class ServerPasswordTestJSON(base.BaseV2ComputeTest):
+    """Test server password"""
+
     create_default_network = True
 
     @classmethod
@@ -28,8 +30,10 @@
 
     @decorators.idempotent_id('f83b582f-62a8-4f22-85b0-0dee50ff783a')
     def test_get_server_password(self):
+        """Test getting password of a server"""
         self.servers_client.show_password(self.server['id'])
 
     @decorators.idempotent_id('f8229e8b-b625-4493-800a-bde86ac611ea')
     def test_delete_server_password(self):
+        """Test deleting password from a server"""
         self.servers_client.delete_password(self.server['id'])
diff --git a/tempest/api/compute/servers/test_server_personality.py b/tempest/api/compute/servers/test_server_personality.py
index 4f484e2..ba2adbb 100644
--- a/tempest/api/compute/servers/test_server_personality.py
+++ b/tempest/api/compute/servers/test_server_personality.py
@@ -28,6 +28,7 @@
 
 
 class ServerPersonalityTestJSON(base.BaseV2ComputeTest):
+    """Test servers with injected files"""
 
     @classmethod
     def setup_credentials(cls):
@@ -51,6 +52,7 @@
     @decorators.attr(type='slow')
     @decorators.idempotent_id('3cfe87fd-115b-4a02-b942-7dc36a337fdf')
     def test_create_server_with_personality(self):
+        """Test creating server with file injection"""
         file_contents = 'This is a test file.'
         file_path = '/test.txt'
         personality = [{'path': file_path,
@@ -85,6 +87,7 @@
     @decorators.attr(type='slow')
     @decorators.idempotent_id('128966d8-71fc-443c-8cab-08e24114ecc9')
     def test_rebuild_server_with_personality(self):
+        """Test injecting file when rebuilding server"""
         validation_resources = self.get_test_validation_resources(
             self.os_primary)
         server = self.create_test_server(
@@ -107,8 +110,11 @@
 
     @decorators.idempotent_id('176cd8c9-b9e8-48ee-a480-180beab292bf')
     def test_personality_files_exceed_limit(self):
-        # Server creation should fail if greater than the maximum allowed
-        # number of files are injected into the server.
+        """Test creating server with injected files over limitation
+
+        Server creation should fail if greater than the maximum allowed
+        number of files are injected into the server.
+        """
         file_contents = 'This is a test file.'
         personality = []
         limits = self.limits_client.show_limits()['limits']
@@ -131,8 +137,11 @@
     @decorators.attr(type='slow')
     @decorators.idempotent_id('52f12ee8-5180-40cc-b417-31572ea3d555')
     def test_can_create_server_with_max_number_personality_files(self):
-        # Server should be created successfully if maximum allowed number of
-        # files is injected into the server during creation.
+        """Test creating server with maximum allowed number of injected files
+
+        Server should be created successfully if maximum allowed number of
+        files is injected into the server during creation.
+        """
         file_contents = 'This is a test file.'
         limits = self.limits_client.show_limits()['limits']
         max_file_limit = limits['absolute']['maxPersonality']
diff --git a/tempest/api/compute/servers/test_server_rescue.py b/tempest/api/compute/servers/test_server_rescue.py
index 1247494..5445113 100644
--- a/tempest/api/compute/servers/test_server_rescue.py
+++ b/tempest/api/compute/servers/test_server_rescue.py
@@ -53,9 +53,11 @@
 
 
 class ServerRescueTestJSON(ServerRescueTestBase):
+    """Test server rescue"""
 
     @decorators.idempotent_id('fd032140-714c-42e4-a8fd-adcd8df06be6')
     def test_rescue_unrescue_instance(self):
+        """Test rescue/unrescue server"""
         password = data_utils.rand_password()
         server = self.create_test_server(adminPass=password,
                                          wait_until='ACTIVE')
@@ -68,6 +70,7 @@
 
 
 class ServerRescueTestJSONUnderV235(ServerRescueTestBase):
+    """Test server rescue with compute microversion less than 2.36"""
 
     max_microversion = '2.35'
 
@@ -81,7 +84,7 @@
     @testtools.skipUnless(CONF.network_feature_enabled.floating_ips,
                           "Floating ips are not available")
     def test_rescued_vm_associate_dissociate_floating_ip(self):
-        # Association of floating IP to a rescued vm
+        """Test associate/dissociate floating ip for rescued server"""
         floating_ip_body = self.floating_ips_client.create_floating_ip(
             pool=CONF.network.floating_network_name)['floating_ip']
         self.addCleanup(self.floating_ips_client.delete_floating_ip,
@@ -96,6 +99,7 @@
 
     @decorators.idempotent_id('affca41f-7195-492d-8065-e09eee245404')
     def test_rescued_vm_add_remove_security_group(self):
+        """Test add/remove security group to for rescued server"""
         # Add Security group
         sg = self.create_security_group()
         self.servers_client.add_security_group(self.rescued_server_id,
@@ -154,33 +158,43 @@
 
 
 class ServerStableDeviceRescueTest(BaseServerStableDeviceRescueTest):
+    """Test rescuing server specifying type of device for the rescue disk"""
 
     @decorators.idempotent_id('947004c3-e8ef-47d9-9f00-97b74f9eaf96')
     def test_stable_device_rescue_cdrom_ide(self):
+        """Test rescuing server with cdrom and ide as the rescue disk"""
         server_id, rescue_image_id = self._create_server_and_rescue_image(
             hw_rescue_device='cdrom', hw_rescue_bus='ide')
         self._test_stable_device_rescue(server_id, rescue_image_id)
 
     @decorators.idempotent_id('16865750-1417-4854-bcf7-496e6753c01e')
     def test_stable_device_rescue_disk_virtio(self):
+        """Test rescuing server with disk and virtio as the rescue disk"""
         server_id, rescue_image_id = self._create_server_and_rescue_image(
             hw_rescue_device='disk', hw_rescue_bus='virtio')
         self._test_stable_device_rescue(server_id, rescue_image_id)
 
     @decorators.idempotent_id('12340157-6306-4745-bdda-cfa019908b48')
     def test_stable_device_rescue_disk_scsi(self):
+        """Test rescuing server with disk and scsi as the rescue disk"""
         server_id, rescue_image_id = self._create_server_and_rescue_image(
             hw_rescue_device='disk', hw_rescue_bus='scsi')
         self._test_stable_device_rescue(server_id, rescue_image_id)
 
     @decorators.idempotent_id('647d04cf-ad35-4956-89ab-b05c5c16f30c')
     def test_stable_device_rescue_disk_usb(self):
+        """Test rescuing server with disk and usb as the rescue disk"""
         server_id, rescue_image_id = self._create_server_and_rescue_image(
             hw_rescue_device='disk', hw_rescue_bus='usb')
         self._test_stable_device_rescue(server_id, rescue_image_id)
 
     @decorators.idempotent_id('a3772b42-00bf-4310-a90b-1cc6fd3e7eab')
     def test_stable_device_rescue_disk_virtio_with_volume_attached(self):
+        """Test rescuing server with volume attached
+
+        Attach a volume to the server and then rescue the server with disk
+        and virtio as the rescue disk.
+        """
         server_id, rescue_image_id = self._create_server_and_rescue_image(
             hw_rescue_device='disk', hw_rescue_bus='virtio')
         server = self.servers_client.show_server(server_id)['server']
@@ -192,12 +206,22 @@
 
 
 class ServerBootFromVolumeStableRescueTest(BaseServerStableDeviceRescueTest):
+    """Test rescuing server specifying type of device for the rescue disk
+
+    Test rescuing server specifying type of device for the rescue disk with
+    compute microversion greater than 2.86.
+    """
 
     min_microversion = '2.87'
 
     @decorators.attr(type='slow')
     @decorators.idempotent_id('48f123cb-922a-4065-8db6-b9a9074a556b')
     def test_stable_device_rescue_bfv_blank_volume(self):
+        """Test rescuing server with blank volume as block_device_mapping_v2
+
+        Create a server with block_device_mapping_v2 with blank volume,
+        then rescue the server with disk and virtio as the rescue disk.
+        """
         block_device_mapping_v2 = [{
             "boot_index": "0",
             "source_type": "blank",
@@ -211,6 +235,11 @@
     @decorators.attr(type='slow')
     @decorators.idempotent_id('e4636333-c928-40fc-98b7-70a23eef4224')
     def test_stable_device_rescue_bfv_image_volume(self):
+        """Test rescuing server with blank volume as block_device_mapping_v2
+
+        Create a server with block_device_mapping_v2 with image volume,
+        then rescue the server with disk and virtio as the rescue disk.
+        """
         block_device_mapping_v2 = [{
             "boot_index": "0",
             "source_type": "image",
diff --git a/tempest/api/compute/servers/test_server_rescue_negative.py b/tempest/api/compute/servers/test_server_rescue_negative.py
index caceb64..9bcf062 100644
--- a/tempest/api/compute/servers/test_server_rescue_negative.py
+++ b/tempest/api/compute/servers/test_server_rescue_negative.py
@@ -27,6 +27,7 @@
 
 
 class ServerRescueNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of server rescue"""
 
     @classmethod
     def skip_checks(cls):
@@ -75,7 +76,7 @@
                           'Pause is not available.')
     @decorators.attr(type=['negative'])
     def test_rescue_paused_instance(self):
-        # Rescue a paused server
+        """Test rescuing a paused server should fail"""
         self.servers_client.pause_server(self.server_id)
         self.addCleanup(self._unpause, self.server_id)
         waiters.wait_for_server_status(self.servers_client,
@@ -87,13 +88,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('db22b618-f157-4566-a317-1b6d467a8094')
     def test_rescued_vm_reboot(self):
+        """Test rebooing a rescued server should fail"""
         self.assertRaises(lib_exc.Conflict, self.servers_client.reboot_server,
                           self.rescue_id, type='HARD')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6dfc0a55-3a77-4564-a144-1587b7971dde')
     def test_rescue_non_existent_server(self):
-        # Rescue a non-existing server
+        """Test rescuing a non-existing server should fail"""
         non_existent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.servers_client.rescue_server,
@@ -102,6 +104,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('70cdb8a1-89f8-437d-9448-8844fd82bf46')
     def test_rescued_vm_rebuild(self):
+        """Test rebuilding a rescued server should fail"""
         self.assertRaises(lib_exc.Conflict,
                           self.servers_client.rebuild_server,
                           self.rescue_id,
@@ -111,6 +114,7 @@
     @utils.services('volume')
     @decorators.attr(type=['negative'])
     def test_rescued_vm_attach_volume(self):
+        """Test attaching volume to a rescued server should fail"""
         volume = self.create_volume()
 
         # Rescue the server
@@ -130,6 +134,7 @@
     @utils.services('volume')
     @decorators.attr(type=['negative'])
     def test_rescued_vm_detach_volume(self):
+        """Test detaching volume from a rescued server should fail"""
         volume = self.create_volume()
 
         # Attach the volume to the server
diff --git a/tempest/api/compute/servers/test_server_tags.py b/tempest/api/compute/servers/test_server_tags.py
index 3893b01..619f480 100644
--- a/tempest/api/compute/servers/test_server_tags.py
+++ b/tempest/api/compute/servers/test_server_tags.py
@@ -22,6 +22,7 @@
 
 
 class ServerTagsTestJSON(base.BaseV2ComputeTest):
+    """Test server tags with compute microversion greater than 2.25"""
 
     min_microversion = '2.26'
     max_microversion = 'latest'
@@ -54,6 +55,7 @@
 
     @decorators.idempotent_id('8d95abe2-c658-4c42-9a44-c0258500306b')
     def test_create_delete_tag(self):
+        """Test creating and deleting server tag"""
         # Check that no tags exist.
         fetched_tags = self.client.list_tags(self.server['id'])['tags']
         self.assertEmpty(fetched_tags)
@@ -73,6 +75,7 @@
 
     @decorators.idempotent_id('a2c1af8c-127d-417d-974b-8115f7e3d831')
     def test_update_all_tags(self):
+        """Test updating all server tags"""
         # Add server tags to the server.
         tags = [data_utils.rand_name('tag'), data_utils.rand_name('tag')]
         self._update_server_tags(self.server['id'], tags)
@@ -89,6 +92,7 @@
 
     @decorators.idempotent_id('a63b2a74-e918-4b7c-bcab-10c855f3a57e')
     def test_delete_all_tags(self):
+        """Test deleting all server tags"""
         # Add server tags to the server.
         assigned_tags = [data_utils.rand_name('tag'),
                          data_utils.rand_name('tag')]
@@ -101,6 +105,7 @@
 
     @decorators.idempotent_id('81279a66-61c3-4759-b830-a2dbe64cbe08')
     def test_check_tag_existence(self):
+        """Test checking server tag existence"""
         # Add server tag to the server.
         assigned_tag = data_utils.rand_name('tag')
         self._update_server_tags(self.server['id'], assigned_tag)
diff --git a/tempest/api/compute/servers/test_servers.py b/tempest/api/compute/servers/test_servers.py
index 3a4bd6d..cc013e3 100644
--- a/tempest/api/compute/servers/test_servers.py
+++ b/tempest/api/compute/servers/test_servers.py
@@ -25,6 +25,7 @@
 
 
 class ServersTestJSON(base.BaseV2ComputeTest):
+    """Test servers API"""
     create_default_network = True
 
     @classmethod
@@ -37,8 +38,11 @@
                           enable_instance_password,
                           'Instance password not available.')
     def test_create_server_with_admin_password(self):
-        # If an admin password is provided on server creation, the server's
-        # root password should be set to that password.
+        """Test creating server with admin password
+
+        If an admin password is provided on server creation, the server's
+        root password should be set to that password.
+        """
         server = self.create_test_server(adminPass='testpassword')
         self.addCleanup(self.delete_server, server['id'])
 
@@ -47,8 +51,7 @@
 
     @decorators.idempotent_id('8fea6be7-065e-47cf-89b8-496e6f96c699')
     def test_create_with_existing_server_name(self):
-        # Creating a server with a name that already exists is allowed
-
+        """Test creating a server with already existing name is allowed"""
         # TODO(sdague): clear out try, we do cleanup one layer up
         server_name = data_utils.rand_name(
             self.__class__.__name__ + '-server')
@@ -69,8 +72,7 @@
 
     @decorators.idempotent_id('f9e15296-d7f9-4e62-b53f-a04e89160833')
     def test_create_specify_keypair(self):
-        # Specify a keypair while creating a server
-
+        """Test creating server with keypair"""
         key_name = data_utils.rand_name('key')
         self.keypairs_client.create_keypair(name=key_name)
         self.addCleanup(self.keypairs_client.delete_keypair, key_name)
@@ -97,7 +99,7 @@
 
     @decorators.idempotent_id('5e6ccff8-349d-4852-a8b3-055df7988dd2')
     def test_update_server_name(self):
-        # The server name should be changed to the provided value
+        """Test updating server name to the provided value"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.addCleanup(self.delete_server, server['id'])
         # Update instance name with non-ASCII characters
@@ -115,7 +117,7 @@
 
     @decorators.idempotent_id('89b90870-bc13-4b73-96af-f9d4f2b70077')
     def test_update_access_server_address(self):
-        # The server's access addresses should reflect the provided values
+        """Test updating server's access addresses to the provided value"""
         server = self.create_test_server(wait_until='ACTIVE')
         self.addCleanup(self.delete_server, server['id'])
 
@@ -132,7 +134,7 @@
 
     @decorators.idempotent_id('38fb1d02-c3c5-41de-91d3-9bc2025a75eb')
     def test_create_server_with_ipv6_addr_only(self):
-        # Create a server without an IPv4 address(only IPv6 address).
+        """Test creating server with ipv6 address only(no ipv4 address)"""
         server = self.create_test_server(accessIPv6='2001:2001::3',
                                          wait_until='ACTIVE')
         self.addCleanup(self.delete_server, server['id'])
@@ -142,17 +144,22 @@
     @decorators.related_bug('1730756')
     @decorators.idempotent_id('defbaca5-d611-49f5-ae21-56ee25d2db49')
     def test_create_server_specify_multibyte_character_name(self):
-        # prefix character is:
-        # http://unicode.org/cldr/utility/character.jsp?a=20A1
+        """Test creating server with multi character name
 
-        # We use a string with 3 byte utf-8 character due to nova
-        # will return 400(Bad Request) if we attempt to send a name which has
-        # 4 byte utf-8 character.
+        prefix character is:
+        http://unicode.org/cldr/utility/character.jsp?a=20A1
+
+        We use a string with 3 byte utf-8 character due to nova
+        will return 400(Bad Request) if we attempt to send a name which has
+        4 byte utf-8 character.
+        """
         utf8_name = data_utils.rand_name(b'\xe2\x82\xa1'.decode('utf-8'))
         self.create_test_server(name=utf8_name, wait_until='ACTIVE')
 
 
 class ServerShowV247Test(base.BaseV2ComputeTest):
+    """Test servers API with compute microversion greater than 2.46"""
+
     min_microversion = '2.47'
     max_microversion = 'latest'
 
@@ -164,12 +171,14 @@
 
     @decorators.idempotent_id('88b0bdb2-494c-11e7-a919-92ebcb67fe33')
     def test_show_server(self):
+        """Test getting server detail"""
         server = self.create_test_server()
         # All fields will be checked by API schema
         self.servers_client.show_server(server['id'])
 
     @decorators.idempotent_id('8de397c2-57d0-4b90-aa30-e5d668f21a8b')
     def test_update_rebuild_list_server(self):
+        """Test update/rebuild/list server"""
         server = self.create_test_server()
         # Checking update API response schema
         self.servers_client.update_server(server['id'])
@@ -184,6 +193,8 @@
 
 
 class ServerShowV263Test(base.BaseV2ComputeTest):
+    """Test servers API with compute microversion greater than 2.62"""
+
     min_microversion = '2.63'
     max_microversion = 'latest'
 
@@ -195,6 +206,7 @@
                           'required to test image certificate validation.')
     @decorators.idempotent_id('71b8e3d5-11d2-494f-b917-b094a4afed3c')
     def test_show_update_rebuild_list_server(self):
+        """Test show/update/rebuild/list server"""
         trusted_certs = CONF.compute.certified_image_trusted_certs
         server = self.create_test_server(
             image_id=CONF.compute.certified_image_ref,
diff --git a/tempest/api/compute/servers/test_servers_microversions.py b/tempest/api/compute/servers/test_servers_microversions.py
index 2434884..566d04a 100644
--- a/tempest/api/compute/servers/test_servers_microversions.py
+++ b/tempest/api/compute/servers/test_servers_microversions.py
@@ -32,11 +32,13 @@
 
 
 class ServerShowV254Test(base.BaseV2ComputeTest):
+    """Test servers API schema for compute microversion greater than 2.53"""
     min_microversion = '2.54'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('09170a98-4940-4637-add7-1a35121f1a5a')
     def test_rebuild_server(self):
+        """Test rebuilding server with microversion greater than 2.53"""
         server = self.create_test_server(wait_until='ACTIVE')
         keypair_name = data_utils.rand_name(
             self.__class__.__name__ + '-keypair')
@@ -52,11 +54,13 @@
 
 
 class ServerShowV257Test(base.BaseV2ComputeTest):
+    """Test servers API schema for compute microversion greater than 2.56"""
     min_microversion = '2.57'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('803df848-080a-4261-8f11-b020cd9b6f60')
     def test_rebuild_server(self):
+        """Test rebuilding server with microversion greater than 2.56"""
         server = self.create_test_server(wait_until='ACTIVE')
         user_data = "ZWNobyAiaGVsbG8gd29ybGQi"
         # Checking rebuild API response schema
diff --git a/tempest/api/compute/servers/test_servers_negative.py b/tempest/api/compute/servers/test_servers_negative.py
index 7fa30b0..4f85048 100644
--- a/tempest/api/compute/servers/test_servers_negative.py
+++ b/tempest/api/compute/servers/test_servers_negative.py
@@ -30,6 +30,8 @@
 
 
 class ServersNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of servers"""
+
     create_default_network = True
 
     def setUp(self):
@@ -58,7 +60,8 @@
         server = cls.create_test_server(wait_until='ACTIVE')
         cls.server_id = server['id']
 
-        server = cls.create_test_server()
+        # Wait until the instance is active to avoid the delete racing
+        server = cls.create_test_server(wait_until='ACTIVE')
         cls.client.delete_server(server['id'])
         waiters.wait_for_server_termination(cls.client, server['id'])
         cls.deleted_server_id = server['id']
@@ -66,8 +69,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('dbbfd247-c40c-449e-8f6c-d2aa7c7da7cf')
     def test_server_name_blank(self):
-        # Create a server with name parameter empty
-
+        """Creating a server with name parameter empty should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
                           name='')
@@ -77,8 +79,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.personality,
                           'Nova personality feature disabled')
     def test_personality_file_contents_not_encoded(self):
-        # Use an unencoded file when creating a server with personality
-
+        """Using an unencoded injected file to create server should fail"""
         file_contents = 'This is a test file.'
         person = [{'path': '/etc/testfile.txt',
                    'contents': file_contents}]
@@ -90,8 +91,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('fcba1052-0a50-4cf3-b1ac-fae241edf02f')
     def test_create_with_invalid_image(self):
-        # Create a server with an unknown image
-
+        """Creating a server with an unknown image should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
                           image_id=-1)
@@ -99,8 +99,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('18f5227f-d155-4429-807c-ccb103887537')
     def test_create_with_invalid_flavor(self):
-        # Create a server with an unknown flavor
-
+        """Creating a server with an unknown flavor should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
                           flavor=-1,)
@@ -108,8 +107,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7f70a4d1-608f-4794-9e56-cb182765972c')
     def test_invalid_access_ip_v4_address(self):
-        # An access IPv4 address must match a valid address pattern
+        """Creating a server with invalid ipv4 ip address should fail
 
+        An access IPv4 address must match a valid address pattern
+        """
         IPv4 = '1.1.1.1.1.1'
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server, accessIPv4=IPv4)
@@ -117,8 +118,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5226dd80-1e9c-4d8a-b5f9-b26ca4763fd0')
     def test_invalid_ip_v6_address(self):
-        # An access IPv6 address must match a valid address pattern
+        """Creating a server with invalid ipv6 ip address should fail
 
+        An access IPv6 address must match a valid address pattern
+        """
         IPv6 = 'notvalid'
 
         self.assertRaises(lib_exc.BadRequest,
@@ -129,7 +132,7 @@
                           'Resize not available.')
     @decorators.attr(type=['negative'])
     def test_resize_nonexistent_server(self):
-        # Resize a non-existent server
+        """Resizing a non-existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.client.resize_server,
@@ -140,7 +143,7 @@
                           'Resize not available.')
     @decorators.attr(type=['negative'])
     def test_resize_server_with_non_existent_flavor(self):
-        # Resize a server with non-existent flavor
+        """Resizing a server with non existent flavor should fail"""
         nonexistent_flavor = data_utils.rand_uuid()
         self.assertRaises(lib_exc.BadRequest, self.client.resize_server,
                           self.server_id, flavor_ref=nonexistent_flavor)
@@ -150,14 +153,14 @@
                           'Resize not available.')
     @decorators.attr(type=['negative'])
     def test_resize_server_with_null_flavor(self):
-        # Resize a server with null flavor
+        """Resizing a server with null flavor should fail"""
         self.assertRaises(lib_exc.BadRequest, self.client.resize_server,
                           self.server_id, flavor_ref="")
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d4c023a0-9c55-4747-9dd5-413b820143c7')
     def test_reboot_non_existent_server(self):
-        # Reboot a non existent server
+        """Rebooting a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.reboot_server,
                           nonexistent_server, type='SOFT')
@@ -167,7 +170,7 @@
                           'Pause is not available.')
     @decorators.attr(type=['negative'])
     def test_pause_paused_server(self):
-        # Pause a paused server.
+        """Pausing a paused server should fail"""
         self.client.pause_server(self.server_id)
         waiters.wait_for_server_status(self.client, self.server_id, 'PAUSED')
         self.assertRaises(lib_exc.Conflict,
@@ -178,7 +181,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('98fa0458-1485-440f-873b-fe7f0d714930')
     def test_rebuild_deleted_server(self):
-        # Rebuild a deleted server
+        """Rebuilding a deleted server should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.rebuild_server,
                           self.deleted_server_id, self.image_ref)
@@ -187,14 +190,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('581a397d-5eab-486f-9cf9-1014bbd4c984')
     def test_reboot_deleted_server(self):
-        # Reboot a deleted server
+        """Rebooting a deleted server should fail"""
         self.assertRaises(lib_exc.NotFound, self.client.reboot_server,
                           self.deleted_server_id, type='SOFT')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d86141a7-906e-4731-b187-d64a2ea61422')
     def test_rebuild_non_existent_server(self):
-        # Rebuild a non existent server
+        """Rebuilding a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.client.rebuild_server,
@@ -204,6 +207,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('fd57f159-68d6-4c2a-902b-03070828a87e')
     def test_create_numeric_server_name(self):
+        """Creating a server with numeric server name should fail"""
         server_name = 12345
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
@@ -212,8 +216,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c3e0fb12-07fc-4d76-a22e-37409887afe8')
     def test_create_server_name_length_exceeds_256(self):
-        # Create a server with name length exceeding 255 characters
+        """Creating a server with name length exceeding limit should fail
 
+        Create a server with name length exceeding 255 characters, an error is
+        returned.
+        """
         server_name = 'a' * 256
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
@@ -224,6 +231,11 @@
     @utils.services('volume')
     @decorators.idempotent_id('12146ac1-d7df-4928-ad25-b1f99e5286cd')
     def test_create_server_invalid_bdm_in_2nd_dict(self):
+        """Creating a server with invalid block_device_mapping_v2 should fail
+
+        Create a server with invalid block_device_mapping_v2, an error is
+        returned.
+        """
         volume = self.create_volume()
         bdm_1st = {"source_type": "image",
                    "delete_on_termination": True,
@@ -243,10 +255,9 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('4e72dc2d-44c5-4336-9667-f7972e95c402')
     def test_create_with_invalid_network_uuid(self):
+        """Creating a server with invalid network uuid should fail"""
         # Pass invalid network uuid while creating a server
-
         networks = [{'fixed_ip': '10.0.1.1', 'uuid': 'a-b-c-d-e-f-g-h-i-j'}]
-
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
                           networks=networks)
@@ -254,8 +265,8 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7a2efc39-530c-47de-b875-2dd01c8d39bd')
     def test_create_with_non_existent_keypair(self):
+        """Creating a server with non-existent keypair should fail"""
         # Pass a non-existent keypair while creating a server
-
         key_name = data_utils.rand_name('key')
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
@@ -264,8 +275,8 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7fc74810-0bd2-4cd7-8244-4f33a9db865a')
     def test_create_server_metadata_exceeds_length_limit(self):
+        """Creating a server with metadata longer than limit should fail """
         # Pass really long metadata while creating a server
-
         metadata = {'a': 'b' * 260}
         self.assertRaises((lib_exc.BadRequest, lib_exc.OverLimit),
                           self.create_test_server,
@@ -274,8 +285,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('aa8eed43-e2cb-4ebf-930b-da14f6a21d81')
     def test_update_name_of_non_existent_server(self):
-        # Update name of a non-existent server
-
+        """Updating name of a non-existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         new_name = data_utils.rand_name(
             self.__class__.__name__ + '-server') + '_updated'
@@ -286,18 +296,19 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('38204696-17c6-44da-9590-40f87fb5a899')
     def test_update_server_set_empty_name(self):
-        # Update name of the server to an empty string
-
+        """Updating name of the server to an empty string should fail"""
         new_name = ''
-
         self.assertRaises(lib_exc.BadRequest, self.client.update_server,
                           self.server_id, name=new_name)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5c8e244c-dada-4590-9944-749c455b431f')
     def test_update_server_name_length_exceeds_256(self):
-        # Update name of server exceed the name length limit
+        """Updating name of server exceeding the name length limit should fail
 
+        Update name of server exceeding the name length limit, an error is
+        returned.
+        """
         new_name = 'a' * 256
         self.assertRaises(lib_exc.BadRequest,
                           self.client.update_server,
@@ -307,8 +318,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1041b4e6-514b-4855-96a5-e974b60870a3')
     def test_delete_non_existent_server(self):
-        # Delete a non existent server
-
+        """Deleting a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.delete_server,
                           nonexistent_server)
@@ -316,23 +326,24 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('75f79124-277c-45e6-a373-a1d6803f4cc4')
     def test_delete_server_pass_negative_id(self):
-        # Pass an invalid string parameter to delete server
-
+        """Passing an invalid string parameter to delete server should fail"""
         self.assertRaises(lib_exc.NotFound, self.client.delete_server, -1)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f4d7279b-5fd2-4bf2-9ba4-ae35df0d18c5')
     def test_delete_server_pass_id_exceeding_length_limit(self):
-        # Pass a server ID that exceeds length limit to delete server
+        """Deleting server with a server ID exceeding length limit should fail
 
+        Pass a server ID that exceeds length limit to delete server, an error
+        is returned.
+        """
         self.assertRaises(lib_exc.NotFound, self.client.delete_server,
                           sys.maxsize + 1)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c5fa6041-80cd-483b-aa6d-4e45f19d093c')
     def test_create_with_nonexistent_security_group(self):
-        # Create a server with a nonexistent security group
-
+        """Creating a server with a nonexistent security group should fail"""
         security_groups = [{'name': 'does_not_exist'}]
         self.assertRaises(lib_exc.BadRequest,
                           self.create_test_server,
@@ -341,7 +352,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('3436b02f-1b1e-4f03-881e-c6a602327439')
     def test_get_non_existent_server(self):
-        # Get a non existent server details
+        """Getting a non existent server details should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.show_server,
                           nonexistent_server)
@@ -349,7 +360,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a31460a9-49e1-42aa-82ee-06e0bb7c2d03')
     def test_stop_non_existent_server(self):
-        # Stop a non existent server
+        """Stopping a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.servers_client.stop_server,
                           nonexistent_server)
@@ -359,7 +370,7 @@
                           'Pause is not available.')
     @decorators.attr(type=['negative'])
     def test_pause_non_existent_server(self):
-        # pause a non existent server
+        """Pausing a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.pause_server,
                           nonexistent_server)
@@ -369,7 +380,7 @@
                           'Pause is not available.')
     @decorators.attr(type=['negative'])
     def test_unpause_non_existent_server(self):
-        # unpause a non existent server
+        """Unpausing a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.unpause_server,
                           nonexistent_server)
@@ -379,7 +390,7 @@
                           'Pause is not available.')
     @decorators.attr(type=['negative'])
     def test_unpause_server_invalid_state(self):
-        # unpause an active server.
+        """Unpausing an active server should fail"""
         self.assertRaises(lib_exc.Conflict,
                           self.client.unpause_server,
                           self.server_id)
@@ -389,7 +400,7 @@
                           'Suspend is not available.')
     @decorators.attr(type=['negative'])
     def test_suspend_non_existent_server(self):
-        # suspend a non existent server
+        """Suspending a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.suspend_server,
                           nonexistent_server)
@@ -399,7 +410,7 @@
                           'Suspend is not available.')
     @decorators.attr(type=['negative'])
     def test_suspend_server_invalid_state(self):
-        # suspend a suspended server.
+        """Suspending a suspended server should fail"""
         self.client.suspend_server(self.server_id)
         waiters.wait_for_server_status(self.client, self.server_id,
                                        'SUSPENDED')
@@ -413,7 +424,7 @@
                           'Suspend is not available.')
     @decorators.attr(type=['negative'])
     def test_resume_non_existent_server(self):
-        # resume a non existent server
+        """Resuming a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.resume_server,
                           nonexistent_server)
@@ -423,7 +434,7 @@
                           'Suspend is not available.')
     @decorators.attr(type=['negative'])
     def test_resume_server_invalid_state(self):
-        # resume an active server.
+        """Resuming an active server should fail"""
         self.assertRaises(lib_exc.Conflict,
                           self.client.resume_server,
                           self.server_id)
@@ -431,7 +442,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7dd919e7-413f-4198-bebb-35e2a01b13e9')
     def test_get_console_output_of_non_existent_server(self):
-        # get the console output for a non existent server
+        """Getting the console output for a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.client.get_console_output,
@@ -440,7 +451,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6f47992b-5144-4250-9f8b-f00aa33950f3')
     def test_force_delete_nonexistent_server_id(self):
-        # force-delete a non existent server
+        """Force-deleting a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.client.force_delete_server,
@@ -449,7 +460,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9c6d38cc-fcfb-437a-85b9-7b788af8bf01')
     def test_restore_nonexistent_server_id(self):
-        # restore-delete a non existent server
+        """Restore-deleting a non existent server should fail
+
+        We can restore a soft deleted server, but can't restore a non
+        existent server.
+        """
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.client.restore_soft_deleted_server,
@@ -458,7 +473,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7fcadfab-bd6a-4753-8db7-4a51e51aade9')
     def test_restore_server_invalid_state(self):
-        # we can only restore-delete a server in 'soft-delete' state
+        """Restore-deleting a server not in 'soft-delete' state should fail
+
+        We can restore a soft deleted server, but can't restore a server that
+        is not in 'soft-delete' state.
+        """
         self.assertRaises(lib_exc.Conflict,
                           self.client.restore_soft_deleted_server,
                           self.server_id)
@@ -468,7 +487,7 @@
                           'Shelve is not available.')
     @decorators.attr(type=['negative'])
     def test_shelve_non_existent_server(self):
-        # shelve a non existent server
+        """Shelving a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.shelve_server,
                           nonexistent_server)
@@ -478,7 +497,7 @@
                           'Shelve is not available.')
     @decorators.attr(type=['negative'])
     def test_shelve_shelved_server(self):
-        # shelve a shelved server.
+        """Shelving a shelved server should fail"""
         compute.shelve_server(self.client, self.server_id)
 
         def _unshelve_server():
@@ -508,7 +527,7 @@
                           'Shelve is not available.')
     @decorators.attr(type=['negative'])
     def test_unshelve_non_existent_server(self):
-        # unshelve a non existent server
+        """Unshelving a non existent server should fail"""
         nonexistent_server = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.client.unshelve_server,
                           nonexistent_server)
@@ -518,7 +537,7 @@
                           'Shelve is not available.')
     @decorators.attr(type=['negative'])
     def test_unshelve_server_invalid_state(self):
-        # unshelve an active server.
+        """Unshelving an active server should fail"""
         self.assertRaises(lib_exc.Conflict,
                           self.client.unshelve_server,
                           self.server_id)
@@ -527,7 +546,7 @@
     @decorators.idempotent_id('74085be3-a370-4ca2-bc51-2d0e10e0f573')
     @utils.services('volume', 'image')
     def test_create_server_from_non_bootable_volume(self):
-        # Create a volume
+        """Creating a server from a non bootable volume should fail"""
         volume = self.create_volume()
 
         # Update volume bootable status to false
@@ -555,6 +574,8 @@
 
 
 class ServersNegativeTestMultiTenantJSON(base.BaseV2ComputeTest):
+    """Negative tests of servers for multiple projects"""
+
     create_default_network = True
 
     credentials = ['primary', 'alt']
@@ -581,8 +602,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('543d84c1-dd2e-4c6d-8cb2-b9da0efaa384')
     def test_update_server_of_another_tenant(self):
-        # Update name of a server that belongs to another tenant
+        """Updating server that belongs to another project should fail
 
+        Update name of a server that belongs to another project, an error is
+        returned.
+        """
         new_name = self.server_id + '_new'
         self.assertRaises(lib_exc.NotFound,
                           self.alt_client.update_server, self.server_id,
@@ -591,7 +615,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5c75009d-3eea-423e-bea3-61b09fd25f9c')
     def test_delete_a_server_of_another_tenant(self):
-        # Delete a server that belongs to another tenant
+        """Deleting a server that belongs to another project should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.alt_client.delete_server,
                           self.server_id)
diff --git a/tempest/api/compute/servers/test_virtual_interfaces.py b/tempest/api/compute/servers/test_virtual_interfaces.py
index dfd6ca4..b2e02c5 100644
--- a/tempest/api/compute/servers/test_virtual_interfaces.py
+++ b/tempest/api/compute/servers/test_virtual_interfaces.py
@@ -28,6 +28,8 @@
 # TODO(mriedem): Remove this test class once the nova queens branch goes into
 # extended maintenance mode.
 class VirtualInterfacesTestJSON(base.BaseV2ComputeTest):
+    """Test virtual interfaces API with compute microversion less than 2.44"""
+
     max_microversion = '2.43'
 
     depends_on_nova_network = True
@@ -47,9 +49,7 @@
     @decorators.idempotent_id('96c4e2ef-5e4d-4d7f-87f5-fed6dca18016')
     @utils.services('network')
     def test_list_virtual_interfaces(self):
-        # Positive test:Should be able to GET the virtual interfaces list
-        # for a given server_id
-
+        """Test listing virtual interfaces of a server"""
         if CONF.service_available.neutron:
             with testtools.ExpectedException(exceptions.BadRequest):
                 self.client.list_virtual_interfaces(self.server['id'])
diff --git a/tempest/api/compute/servers/test_virtual_interfaces_negative.py b/tempest/api/compute/servers/test_virtual_interfaces_negative.py
index f6e8bc9..5667281 100644
--- a/tempest/api/compute/servers/test_virtual_interfaces_negative.py
+++ b/tempest/api/compute/servers/test_virtual_interfaces_negative.py
@@ -23,6 +23,12 @@
 # TODO(mriedem): Remove this test class once the nova queens branch goes into
 # extended maintenance mode.
 class VirtualInterfacesNegativeTestJSON(base.BaseV2ComputeTest):
+    """Negative tests of virtual interfaces API
+
+    Negative tests of virtual interfaces API for compute microversion less
+    than 2.44.
+    """
+
     max_microversion = '2.43'
 
     depends_on_nova_network = True
@@ -37,8 +43,7 @@
     @decorators.idempotent_id('64ebd03c-1089-4306-93fa-60f5eb5c803c')
     @utils.services('network')
     def test_list_virtual_interfaces_invalid_server_id(self):
-        # Negative test: Should not be able to GET virtual interfaces
-        # for an invalid server_id
+        """Test listing virtual interfaces of an invalid server should fail"""
         invalid_server_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.servers_client.list_virtual_interfaces,
diff --git a/tempest/api/compute/test_extensions.py b/tempest/api/compute/test_extensions.py
index 12e7fea..3318876 100644
--- a/tempest/api/compute/test_extensions.py
+++ b/tempest/api/compute/test_extensions.py
@@ -27,10 +27,11 @@
 
 
 class ExtensionsTest(base.BaseV2ComputeTest):
+    """Tests Compute Extensions API"""
 
     @decorators.idempotent_id('3bb27738-b759-4e0d-a5fa-37d7a6df07d1')
     def test_list_extensions(self):
-        # List of all extensions
+        """Test listing compute extensions"""
         if not CONF.compute_feature_enabled.api_extensions:
             raise self.skipException('There are not any extensions configured')
         extensions = self.extensions_client.list_extensions()['extensions']
@@ -50,6 +51,6 @@
     @decorators.idempotent_id('05762f39-bdfa-4cdb-9b46-b78f8e78e2fd')
     @utils.requires_ext(extension='os-consoles', service='compute')
     def test_get_extension(self):
-        # get the specified extensions
+        """Test getting specified compute extension details"""
         extension = self.extensions_client.show_extension('os-consoles')
         self.assertEqual('os-consoles', extension['extension']['alias'])
diff --git a/tempest/api/compute/test_networks.py b/tempest/api/compute/test_networks.py
index 76131e2..97c26e4 100644
--- a/tempest/api/compute/test_networks.py
+++ b/tempest/api/compute/test_networks.py
@@ -20,6 +20,7 @@
 
 
 class ComputeNetworksTest(base.BaseV2ComputeTest):
+    """Test compute networks API with compute microversion less than 2.36"""
     max_microversion = '2.35'
 
     @classmethod
@@ -35,5 +36,6 @@
 
     @decorators.idempotent_id('3fe07175-312e-49a5-a623-5f52eeada4c2')
     def test_list_networks(self):
+        """Test listing networks using compute networks API"""
         networks = self.client.list_networks()['networks']
         self.assertNotEmpty(networks, "No networks found.")
diff --git a/tempest/api/compute/test_quotas.py b/tempest/api/compute/test_quotas.py
index a62492d..5fe0e3b 100644
--- a/tempest/api/compute/test_quotas.py
+++ b/tempest/api/compute/test_quotas.py
@@ -20,6 +20,7 @@
 
 
 class QuotasTestJSON(base.BaseV2ComputeTest):
+    """Test compute quotas"""
 
     @classmethod
     def skip_checks(cls):
@@ -59,7 +60,7 @@
 
     @decorators.idempotent_id('f1ef0a97-dbbb-4cca-adc5-c9fbc4f76107')
     def test_get_quotas(self):
-        # User can get the quota set for it's tenant
+        """Test user can get the compute quota set for it's project"""
         expected_quota_set = self.default_quota_set | set(['id'])
         quota_set = self.client.show_quota_set(self.tenant_id)['quota_set']
         self.assertEqual(quota_set['id'], self.tenant_id)
@@ -75,7 +76,7 @@
 
     @decorators.idempotent_id('9bfecac7-b966-4f47-913f-1a9e2c12134a')
     def test_get_default_quotas(self):
-        # User can get the default quota set for it's tenant
+        """Test user can get the default compute quota set for it's project"""
         expected_quota_set = self.default_quota_set | set(['id'])
         quota_set = (self.client.show_default_quota_set(self.tenant_id)
                      ['quota_set'])
@@ -85,7 +86,7 @@
 
     @decorators.idempotent_id('cd65d997-f7e4-4966-a7e9-d5001b674fdc')
     def test_compare_tenant_quotas_with_default_quotas(self):
-        # Tenants are created with the default quota values
+        """Test tenants are created with the default compute quota values"""
         default_quota_set = \
             self.client.show_default_quota_set(self.tenant_id)['quota_set']
         tenant_quota_set = (self.client.show_quota_set(self.tenant_id)
diff --git a/tempest/api/compute/test_tenant_networks.py b/tempest/api/compute/test_tenant_networks.py
index f4eada0..17f4b80 100644
--- a/tempest/api/compute/test_tenant_networks.py
+++ b/tempest/api/compute/test_tenant_networks.py
@@ -18,6 +18,8 @@
 
 
 class ComputeTenantNetworksTest(base.BaseV2ComputeTest):
+    """Test compute tenant networks API with microversion less than 2.36"""
+
     max_microversion = '2.35'
 
     @classmethod
@@ -34,8 +36,11 @@
     @decorators.idempotent_id('edfea98e-bbe3-4c7a-9739-87b986baff26')
     @utils.services('network')
     def test_list_show_tenant_networks(self):
-        # Fetch all networks that are visible to the tenant: this may include
-        # shared and external networks
+        """Test list/show tenant networks
+
+        Fetch all networks that are visible to the tenant: this may include
+        shared and external networks.
+        """
         tenant_networks = [
             n['id'] for n in self.client.list_tenant_networks()['networks']
         ]
diff --git a/tempest/api/compute/volumes/test_attach_volume.py b/tempest/api/compute/volumes/test_attach_volume.py
index 97813a5..d85e4f7 100644
--- a/tempest/api/compute/volumes/test_attach_volume.py
+++ b/tempest/api/compute/volumes/test_attach_volume.py
@@ -59,13 +59,17 @@
 
 
 class AttachVolumeTestJSON(BaseAttachVolumeTest):
+    """Test attaching volume to server"""
 
     @decorators.idempotent_id('52e9045a-e90d-4c0d-9087-79d657faffff')
     # This test is conditionally marked slow if SSH validation is enabled.
     @decorators.attr(type='slow', condition=CONF.validation.run_validation)
     def test_attach_detach_volume(self):
-        # Stop and Start a server with an attached volume, ensuring that
-        # the volume remains attached.
+        """Test attaching and detaching volume from server
+
+        Stop and Start a server with an attached volume, ensuring that
+        the volume remains attached.
+        """
         server, validation_resources = self._create_server()
 
         # NOTE(andreaf) Create one remote client used throughout the test.
@@ -125,6 +129,13 @@
 
     @decorators.idempotent_id('7fa563fe-f0f7-43eb-9e22-a1ece036b513')
     def test_list_get_volume_attachments(self):
+        """Test listing and getting volume attachments
+
+        First we attach one volume to the server, check listing and getting
+        the volume attachment of the server. Then we attach another volume to
+        the server, check listing and getting the volume attachments of the
+        server. Finally we detach the volumes from the server one by one.
+        """
         # List volume attachment of the server
         server, validation_resources = self._create_server()
         volume_1st = self.create_volume()
@@ -244,8 +255,12 @@
     @decorators.attr(type='slow')
     @decorators.idempotent_id('13a940b6-3474-4c3c-b03f-29b89112bfee')
     def test_attach_volume_shelved_or_offload_server(self):
-        # Create server, count number of volumes on it, shelve
-        # server and attach pre-created volume to shelved server
+        """Test attaching volume to shelved server
+
+        Create server, count number of volumes on it, shelve
+        server and attach pre-created volume to shelved server, then
+        unshelve the server and check that attached volume exists.
+        """
         server, validation_resources = self._create_server()
         volume = self.create_volume()
         num_vol = self._count_volumes(server, validation_resources)
@@ -271,8 +286,12 @@
     @decorators.attr(type='slow')
     @decorators.idempotent_id('b54e86dd-a070-49c4-9c07-59ae6dae15aa')
     def test_detach_volume_shelved_or_offload_server(self):
-        # Count number of volumes on instance, shelve
-        # server and attach pre-created volume to shelved server
+        """Test detaching volume from shelved server
+
+        Count number of volumes on server, shelve server and attach
+        pre-created volume to shelved server, then detach the volume, unshelve
+        the instance and check that we have the expected number of volume(s).
+        """
         server, validation_resources = self._create_server()
         volume = self.create_volume()
         num_vol = self._count_volumes(server, validation_resources)
@@ -291,6 +310,12 @@
 
 
 class AttachVolumeMultiAttachTest(BaseAttachVolumeTest):
+    """Test attaching one volume to multiple servers
+
+    Test attaching one volume to multiple servers with compute
+    microversion greater than 2.59.
+    """
+
     min_microversion = '2.60'
     max_microversion = 'latest'
 
@@ -367,6 +392,12 @@
 
     @decorators.idempotent_id('8d5853f7-56e7-4988-9b0c-48cea3c7049a')
     def test_list_get_volume_attachments_multiattach(self):
+        """Test listing and getting multiattached volume attachments
+
+        Attach a single volume to two servers, list attachments from the
+        volume and make sure the server uuids are in the list, then detach
+        the volume from servers one by one.
+        """
         # Attach a single volume to two servers.
         servers, volume, attachments = self._create_and_multiattach()
 
@@ -448,7 +479,10 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize not available.')
     def test_resize_server_with_multiattached_volume(self):
-        # Attach a single volume to multiple servers, then resize the servers
+        """Test resizing servers with multiattached volume
+
+        Attach a single volume to multiple servers, then resize the servers
+        """
         servers, volume, _ = self._create_and_multiattach()
 
         for server in servers:
diff --git a/tempest/api/compute/volumes/test_attach_volume_negative.py b/tempest/api/compute/volumes/test_attach_volume_negative.py
index 9a506af..516f599 100644
--- a/tempest/api/compute/volumes/test_attach_volume_negative.py
+++ b/tempest/api/compute/volumes/test_attach_volume_negative.py
@@ -21,6 +21,8 @@
 
 
 class AttachVolumeNegativeTest(base.BaseV2ComputeTest):
+    """Negative tests of volume attaching"""
+
     create_default_network = True
 
     @classmethod
@@ -34,6 +36,7 @@
     @decorators.related_bug('1630783', status_code=500)
     @decorators.idempotent_id('a313b5cd-fbd0-49cc-94de-870e99f763c7')
     def test_delete_attached_volume(self):
+        """Test deleting attachemd volume should fail"""
         server = self.create_test_server(wait_until='ACTIVE')
         volume = self.create_volume()
         self.attach_volume(server, volume)
@@ -44,10 +47,13 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('aab919e2-d992-4cbb-a4ed-745c2475398c')
     def test_attach_attached_volume_to_same_server(self):
-        # Test attaching the same volume to the same instance once
-        # it's already attached. The nova/cinder validation for this differs
-        # depending on whether or not cinder v3.27 is being used to attach
-        # the volume to the instance.
+        """Test attaching attached volume to same server should fail
+
+        Test attaching the same volume to the same instance once
+        it's already attached. The nova/cinder validation for this differs
+        depending on whether or not cinder v3.27 is being used to attach
+        the volume to the instance.
+        """
         server = self.create_test_server(wait_until='ACTIVE')
         volume = self.create_volume()
 
@@ -59,6 +65,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ee37a796-2afb-11e7-bc0f-fa163e65f5ce')
     def test_attach_attached_volume_to_different_server(self):
+        """Test attaching attached volume to different server should fail"""
         server1 = self.create_test_server(wait_until='ACTIVE')
         volume = self.create_volume()
 
diff --git a/tempest/api/compute/volumes/test_volume_snapshots.py b/tempest/api/compute/volumes/test_volume_snapshots.py
index f3ccf8d..30bea60 100644
--- a/tempest/api/compute/volumes/test_volume_snapshots.py
+++ b/tempest/api/compute/volumes/test_volume_snapshots.py
@@ -24,6 +24,7 @@
 
 
 class VolumesSnapshotsTestJSON(base.BaseV2ComputeTest):
+    """Test volume snapshots with compute microversion less than 2.36"""
 
     # These tests will fail with a 404 starting from microversion 2.36. For
     # more information, see:
@@ -48,6 +49,7 @@
 
     @decorators.idempotent_id('cd4ec87d-7825-450d-8040-6e2068f2da8f')
     def test_volume_snapshot_create_get_list_delete(self):
+        """Test create/get/list/delete volume snapshot"""
         volume = self.create_volume()
         self.addCleanup(self.delete_volume, volume['id'])
 
diff --git a/tempest/api/compute/volumes/test_volumes_get.py b/tempest/api/compute/volumes/test_volumes_get.py
index 0d23c1f..554f418 100644
--- a/tempest/api/compute/volumes/test_volumes_get.py
+++ b/tempest/api/compute/volumes/test_volumes_get.py
@@ -25,6 +25,7 @@
 
 
 class VolumesGetTestJSON(base.BaseV2ComputeTest):
+    """Test compute volumes API with microversion less than 2.36"""
 
     # These tests will fail with a 404 starting from microversion 2.36. For
     # more information, see:
@@ -45,7 +46,7 @@
 
     @decorators.idempotent_id('f10f25eb-9775-4d9d-9cbe-1cf54dae9d5f')
     def test_volume_create_get_delete(self):
-        # CREATE, GET, DELETE Volume
+        """Test create/get/delete volume"""
         v_name = data_utils.rand_name(self.__class__.__name__ + '-Volume')
         metadata = {'Type': 'work'}
         # Create volume
diff --git a/tempest/api/compute/volumes/test_volumes_list.py b/tempest/api/compute/volumes/test_volumes_list.py
index 28bc174..0b37264 100644
--- a/tempest/api/compute/volumes/test_volumes_list.py
+++ b/tempest/api/compute/volumes/test_volumes_list.py
@@ -21,6 +21,8 @@
 
 
 class VolumesTestJSON(base.BaseV2ComputeTest):
+    """Test listing volumes with compute microversion less than 2.36"""
+
     # NOTE: This test creates a number of 1G volumes. To run successfully,
     # ensure that the backing file for the volume group that Nova uses
     # has space for at least 3 1G volumes!
@@ -57,7 +59,7 @@
 
     @decorators.idempotent_id('bc2dd1a0-15af-48e5-9990-f2e75a48325d')
     def test_volume_list(self):
-        # Should return the list of Volumes
+        """Test listing volumes should return all volumes"""
         # Fetch all Volumes
         fetched_list = self.client.list_volumes()['volumes']
         # Now check if all the Volumes created in setup are in fetched list
@@ -72,7 +74,7 @@
 
     @decorators.idempotent_id('bad0567a-5a4f-420b-851e-780b55bb867c')
     def test_volume_list_with_details(self):
-        # Should return the list of Volumes with details
+        """Test listing volumes with detail should return all volumes"""
         # Fetch all Volumes
         fetched_list = self.client.list_volumes(detail=True)['volumes']
         # Now check if all the Volumes created in setup are in fetched list
@@ -87,7 +89,11 @@
 
     @decorators.idempotent_id('1048ed81-2baf-487a-b284-c0622b86e7b8')
     def test_volume_list_param_limit(self):
-        # Return the list of volumes based on limit set
+        """Test listing volumes based on limit set
+
+        If we list volumes with limit=2, then only 2 volumes should be
+        returned.
+        """
         params = {'limit': 2}
         fetched_vol_list = self.client.list_volumes(**params)['volumes']
 
@@ -96,7 +102,11 @@
 
     @decorators.idempotent_id('33985568-4965-49d5-9bcc-0aa007ca5b7a')
     def test_volume_list_with_detail_param_limit(self):
-        # Return the list of volumes with details based on limit set.
+        """Test listing volumes with detail based on limit set
+
+        If we list volumes with detail with limit=2, then only 2 volumes with
+        detail should be returned.
+        """
         params = {'limit': 2}
         fetched_vol_list = self.client.list_volumes(detail=True,
                                                     **params)['volumes']
@@ -106,7 +116,12 @@
 
     @decorators.idempotent_id('51c22651-a074-4ea7-af0b-094f9331303e')
     def test_volume_list_param_offset_and_limit(self):
-        # Return the list of volumes based on offset and limit set.
+        """Test listing volumes based on offset and limit set
+
+        If we list volumes with offset=1 and limit=1, then 1 volume located
+        in the position 1 in the all volumes list should be returned.
+        (The items in the all volumes list start from position 0.)
+        """
         # get all volumes list
         all_vol_list = self.client.list_volumes()['volumes']
         params = {'offset': 1, 'limit': 1}
@@ -123,7 +138,13 @@
 
     @decorators.idempotent_id('06b6abc4-3f10-48e9-a7a1-3facc98f03e5')
     def test_volume_list_with_detail_param_offset_and_limit(self):
-        # Return the list of volumes details based on offset and limit set.
+        """Test listing volumes with detail based on offset and limit set
+
+        If we list volumes with detail with offset=1 and limit=1, then 1
+        volume with detail located in the position 1 in the all volumes list
+        should be returned.
+        (The items in the all volumes list start from position 0.)
+        """
         # get all volumes list
         all_vol_list = self.client.list_volumes(detail=True)['volumes']
         params = {'offset': 1, 'limit': 1}
diff --git a/tempest/api/compute/volumes/test_volumes_negative.py b/tempest/api/compute/volumes/test_volumes_negative.py
index 444ce93..f553e32 100644
--- a/tempest/api/compute/volumes/test_volumes_negative.py
+++ b/tempest/api/compute/volumes/test_volumes_negative.py
@@ -23,6 +23,7 @@
 
 
 class VolumesNegativeTest(base.BaseV2ComputeTest):
+    """Negative tests of volumes with compute microversion less than 2.36"""
 
     # These tests will fail with a 404 starting from microversion 2.36. For
     # more information, see:
@@ -44,7 +45,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c03ea686-905b-41a2-8748-9635154b7c57')
     def test_volume_get_nonexistent_volume_id(self):
-        # Negative: Should not be able to get details of nonexistent volume
+        """Test getting details of a non existent volume should fail"""
         # Creating a nonexistent volume id
         # Trying to GET a non existent volume
         self.assertRaises(lib_exc.NotFound, self.client.show_volume,
@@ -53,7 +54,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('54a34226-d910-4b00-9ef8-8683e6c55846')
     def test_volume_delete_nonexistent_volume_id(self):
-        # Negative: Should not be able to delete nonexistent Volume
+        """Test deleting a nonexistent volume should fail"""
         # Creating nonexistent volume id
         # Trying to DELETE a non existent volume
         self.assertRaises(lib_exc.NotFound, self.client.delete_volume,
@@ -62,8 +63,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5125ae14-152b-40a7-b3c5-eae15e9022ef')
     def test_create_volume_with_invalid_size(self):
-        # Negative: Should not be able to create volume with invalid size
-        # in request
+        """Test creating volume with invalid size should fail"""
         v_name = data_utils.rand_name(self.__class__.__name__ + '-Volume')
         metadata = {'Type': 'work'}
         self.assertRaises(lib_exc.BadRequest, self.client.create_volume,
@@ -72,8 +72,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('131cb3a1-75cc-4d40-b4c3-1317f64719b0')
     def test_create_volume_without_passing_size(self):
-        # Negative: Should not be able to create volume without passing size
-        # in request
+        """Test creating volume without specifying size should fail"""
         v_name = data_utils.rand_name(self.__class__.__name__ + '-Volume')
         metadata = {'Type': 'work'}
         self.assertRaises(lib_exc.BadRequest, self.client.create_volume,
@@ -82,7 +81,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8cce995e-0a83-479a-b94d-e1e40b8a09d1')
     def test_create_volume_with_size_zero(self):
-        # Negative: Should not be able to create volume with size zero
+        """Test creating volume with size=0 should fail"""
         v_name = data_utils.rand_name(self.__class__.__name__ + '-Volume')
         metadata = {'Type': 'work'}
         self.assertRaises(lib_exc.BadRequest, self.client.create_volume,
@@ -91,14 +90,13 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('62bab09a-4c03-4617-8cca-8572bc94af9b')
     def test_get_volume_without_passing_volume_id(self):
-        # Negative: Should not be able to get volume when empty ID is passed
+        """Test getting volume details without volume id should fail"""
         self.assertRaises(lib_exc.NotFound, self.client.show_volume, '')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('62972737-124b-4513-b6cf-2f019f178494')
     def test_delete_invalid_volume_id(self):
-        # Negative: Should not be able to delete volume when invalid ID is
-        # passed
+        """Test deleting volume with an invalid volume id should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.client.delete_volume,
                           data_utils.rand_name('invalid'))
@@ -106,5 +104,5 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0d1417c5-4ae8-4c2c-adc5-5f0b864253e5')
     def test_delete_volume_without_passing_volume_id(self):
-        # Negative: Should not be able to delete volume when empty ID is passed
+        """Test deleting volume without volume id should fail"""
         self.assertRaises(lib_exc.NotFound, self.client.delete_volume, '')
diff --git a/tempest/api/identity/admin/v2/test_roles_negative.py b/tempest/api/identity/admin/v2/test_roles_negative.py
index f3b7494..3c71ba9 100644
--- a/tempest/api/identity/admin/v2/test_roles_negative.py
+++ b/tempest/api/identity/admin/v2/test_roles_negative.py
@@ -20,6 +20,7 @@
 
 
 class RolesNegativeTestJSON(base.BaseIdentityV2AdminTest):
+    """Negative tests of keystone roles via v2 API"""
 
     def _get_role_params(self):
         user = self.setup_test_user()
@@ -30,14 +31,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d5d5f1df-f8ca-4de0-b2ef-259c1cc67025')
     def test_list_roles_by_unauthorized_user(self):
-        # Non-administrator user should not be able to list roles
+        """Test Non-admin user should not be able to list roles via v2 API"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_roles_client.list_roles)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('11a3c7da-df6c-40c2-abc2-badd682edf9f')
     def test_list_roles_request_without_token(self):
-        # Request to list roles without a valid token should fail
+        """Test listing roles without a valid token via v2 API should fail"""
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(lib_exc.Unauthorized, self.roles_client.list_roles)
@@ -46,14 +47,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c0b89e56-accc-4c73-85f8-9c0f866104c1')
     def test_role_create_blank_name(self):
-        # Should not be able to create a role with a blank name
+        """Test creating a role with a blank name via v2 API is not allowed"""
         self.assertRaises(lib_exc.BadRequest, self.roles_client.create_role,
                           name='')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('585c8998-a8a4-4641-a5dd-abef7a8ced00')
     def test_create_role_by_unauthorized_user(self):
-        # Non-administrator user should not be able to create role
+        """Test non-admin user should not be able to create role via v2 API"""
         role_name = data_utils.rand_name(name='role')
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_roles_client.create_role,
@@ -62,7 +63,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a7edd17a-e34a-4aab-8bb7-fa6f498645b8')
     def test_create_role_request_without_token(self):
-        # Request to create role without a valid token should fail
+        """Test creating role without a valid token via v2 API should fail"""
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         role_name = data_utils.rand_name(name='role')
@@ -73,7 +74,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c0cde2c8-81c1-4bb0-8fe2-cf615a3547a8')
     def test_role_create_duplicate(self):
-        # Role names should be unique
+        """Test role names should be unique via v2 API"""
         role_name = data_utils.rand_name(name='role-dup')
         body = self.roles_client.create_role(name=role_name)['role']
         role1_id = body.get('id')
@@ -84,7 +85,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('15347635-b5b1-4a87-a280-deb2bd6d865e')
     def test_delete_role_by_unauthorized_user(self):
-        # Non-administrator user should not be able to delete role
+        """Test non-admin user should not be able to delete role via v2 API"""
         role_name = data_utils.rand_name(name='role')
         body = self.roles_client.create_role(name=role_name)['role']
         self.addCleanup(self.roles_client.delete_role, body['id'])
@@ -95,7 +96,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('44b60b20-70de-4dac-beaf-a3fc2650a16b')
     def test_delete_role_request_without_token(self):
-        # Request to delete role without a valid token should fail
+        """Test deleting role without a valid token via v2 API should fail"""
         role_name = data_utils.rand_name(name='role')
         body = self.roles_client.create_role(name=role_name)['role']
         self.addCleanup(self.roles_client.delete_role, body['id'])
@@ -110,7 +111,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('38373691-8551-453a-b074-4260ad8298ef')
     def test_delete_role_non_existent(self):
-        # Attempt to delete a non existent role should fail
+        """Test deleting a non existent role via v2 API should fail"""
         non_existent_role = data_utils.rand_uuid_hex()
         self.assertRaises(lib_exc.NotFound, self.roles_client.delete_role,
                           non_existent_role)
@@ -118,8 +119,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('391df5cf-3ec3-46c9-bbe5-5cb58dd4dc41')
     def test_assign_user_role_by_unauthorized_user(self):
-        # Non-administrator user should not be authorized to
-        # assign a role to user
+        """Test non-admin user assigning a role to user via v2 API
+
+        Non-admin user should not be authorized to assign a role to user via
+        v2 API.
+        """
         (user, tenant, role) = self._get_role_params()
         self.assertRaises(
             lib_exc.Forbidden,
@@ -129,7 +133,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f0d2683c-5603-4aee-95d7-21420e87cfd8')
     def test_assign_user_role_request_without_token(self):
-        # Request to assign a role to a user without a valid token
+        """Test assigning a role to a user without a valid token via v2 API
+
+        Assigning a role to a user without a valid token via v2 API should
+        fail.
+        """
         (user, tenant, role) = self._get_role_params()
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
@@ -142,7 +150,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('99b297f6-2b5d-47c7-97a9-8b6bb4f91042')
     def test_assign_user_role_for_non_existent_role(self):
-        # Attempt to assign a non existent role to user should fail
+        """Test assigning a non existent role to user via v2 API
+
+        Assigning a non existent role to user via v2 API should fail.
+        """
         (user, tenant, _) = self._get_role_params()
         non_existent_role = data_utils.rand_uuid_hex()
         self.assertRaises(lib_exc.NotFound,
@@ -152,7 +163,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b2285aaa-9e76-4704-93a9-7a8acd0a6c8f')
     def test_assign_user_role_for_non_existent_tenant(self):
-        # Attempt to assign a role on a non existent tenant should fail
+        """Test assigning a role on a non existent tenant via v2 API
+
+        Assigning a role on a non existent tenant via v2 API should fail.
+        """
         (user, _, role) = self._get_role_params()
         non_existent_tenant = data_utils.rand_uuid_hex()
         self.assertRaises(lib_exc.NotFound,
@@ -162,7 +176,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5c3132cd-c4c8-4402-b5ea-71eb44e97793')
     def test_assign_duplicate_user_role(self):
-        # Duplicate user role should not get assigned
+        """Test duplicate user role should not get assigned via v2 API"""
         (user, tenant, role) = self._get_role_params()
         self.roles_client.create_user_role_on_project(tenant['id'],
                                                       user['id'],
@@ -174,8 +188,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d0537987-0977-448f-a435-904c15de7298')
     def test_remove_user_role_by_unauthorized_user(self):
-        # Non-administrator user should not be authorized to
-        # remove a user's role
+        """Test non-admin user removing a user's role via v2 API
+
+        Non-admin user should not be authorized to remove a user's role via
+        v2 API
+        """
         (user, tenant, role) = self._get_role_params()
         self.roles_client.create_user_role_on_project(tenant['id'],
                                                       user['id'],
@@ -188,7 +205,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('cac81cf4-c1d2-47dc-90d3-f2b7eb572286')
     def test_remove_user_role_request_without_token(self):
-        # Request to remove a user's role without a valid token
+        """Test removing a user's role without a valid token via v2 API
+
+        Removing a user's role without a valid token via v2 API should fail.
+        """
         (user, tenant, role) = self._get_role_params()
         self.roles_client.create_user_role_on_project(tenant['id'],
                                                       user['id'],
@@ -203,7 +223,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ab32d759-cd16-41f1-a86e-44405fa9f6d2')
     def test_remove_user_role_non_existent_role(self):
-        # Attempt to delete a non existent role from a user should fail
+        """Test deleting a non existent role from a user via v2 API
+
+        Deleting a non existent role from a user via v2 API should fail.
+        """
         (user, tenant, role) = self._get_role_params()
         self.roles_client.create_user_role_on_project(tenant['id'],
                                                       user['id'],
@@ -216,7 +239,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('67a679ec-03dd-4551-bbfc-d1c93284f023')
     def test_remove_user_role_non_existent_tenant(self):
-        # Attempt to remove a role from a non existent tenant should fail
+        """Test removing a role from a non existent tenant via v2 API
+
+        Removing a role from a non existent tenant via v2 API should fail.
+        """
         (user, tenant, role) = self._get_role_params()
         self.roles_client.create_user_role_on_project(tenant['id'],
                                                       user['id'],
@@ -229,8 +255,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7391ab4c-06f3-477a-a64a-c8e55ce89837')
     def test_list_user_roles_by_unauthorized_user(self):
-        # Non-administrator user should not be authorized to list
-        # a user's roles
+        """Test non-admin user listing a user's roles via v2 API
+
+        Non-admin user should not be authorized to list a user's roles via v2
+        API.
+        """
         (user, tenant, role) = self._get_role_params()
         self.roles_client.create_user_role_on_project(tenant['id'],
                                                       user['id'],
@@ -243,7 +272,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('682adfb2-fd5f-4b0a-a9ca-322e9bebb907')
     def test_list_user_roles_request_without_token(self):
-        # Request to list user's roles without a valid token should fail
+        """Test listing user's roles without a valid token via v2 API
+
+        Listing user's roles without a valid token via v2 API should fail
+        """
         (user, tenant, _) = self._get_role_params()
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
diff --git a/tempest/api/identity/admin/v2/test_services.py b/tempest/api/identity/admin/v2/test_services.py
index 03543ac..182b24c 100644
--- a/tempest/api/identity/admin/v2/test_services.py
+++ b/tempest/api/identity/admin/v2/test_services.py
@@ -20,6 +20,7 @@
 
 
 class ServicesTestJSON(base.BaseIdentityV2AdminTest):
+    """Test identity services via v2 API"""
 
     def _del_service(self, service_id):
         # Deleting the service created in this method
@@ -30,6 +31,7 @@
 
     @decorators.idempotent_id('84521085-c6e6-491c-9a08-ec9f70f90110')
     def test_create_get_delete_service(self):
+        """Test verifies the identity service create/get/delete via v2 API"""
         # GET Service
         # Creating a Service
         name = data_utils.rand_name('service')
@@ -64,7 +66,10 @@
 
     @decorators.idempotent_id('5d3252c8-e555-494b-a6c8-e11d7335da42')
     def test_create_service_without_description(self):
-        # Create a service only with name and type
+        """Test creating identity service without description via v2 API
+
+        Create a service only with name and type.
+        """
         name = data_utils.rand_name('service')
         s_type = data_utils.rand_name('type')
         service = self.services_client.create_service(
@@ -79,7 +84,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('34ea6489-012d-4a86-9038-1287cadd5eca')
     def test_list_services(self):
-        # Create, List, Verify and Delete Services
+        """Test Create/List/Verify/Delete of identity service via v2 API"""
         services = []
         for _ in range(3):
             name = data_utils.rand_name('service')
diff --git a/tempest/api/identity/admin/v2/test_tenant_negative.py b/tempest/api/identity/admin/v2/test_tenant_negative.py
index 49bb949..792dad9 100644
--- a/tempest/api/identity/admin/v2/test_tenant_negative.py
+++ b/tempest/api/identity/admin/v2/test_tenant_negative.py
@@ -20,18 +20,22 @@
 
 
 class TenantsNegativeTestJSON(base.BaseIdentityV2AdminTest):
+    """Negative tests of keystone tenants via v2 API"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ca9bb202-63dd-4240-8a07-8ef9c19c04bb')
     def test_list_tenants_by_unauthorized_user(self):
-        # Non-administrator user should not be able to list tenants
+        """Test Non-admin should not be able to list tenants via v2 API"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_tenants_client.list_tenants)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('df33926c-1c96-4d8d-a762-79cc6b0c3cf4')
     def test_list_tenant_request_without_token(self):
-        # Request to list tenants without a valid token should fail
+        """Test listing tenants without a valid token via v2 API
+
+        Listing tenants without a valid token via v2 API should fail.
+        """
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(lib_exc.Unauthorized,
@@ -41,7 +45,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('162ba316-f18b-4987-8c0c-fd9140cd63ed')
     def test_tenant_delete_by_unauthorized_user(self):
-        # Non-administrator user should not be able to delete a tenant
+        """Test non-admin should not be able to delete a tenant via v2 API"""
         tenant = self.setup_test_tenant()
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_tenants_client.delete_tenant,
@@ -50,7 +54,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e450db62-2e9d-418f-893a-54772d6386b1')
     def test_tenant_delete_request_without_token(self):
-        # Request to delete a tenant without a valid token should fail
+        """Test deleting a tenant without a valid token via v2 API
+
+        Deleting a tenant without a valid token via v2 API should fail.
+        """
         tenant = self.setup_test_tenant()
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
@@ -62,14 +69,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9c9a2aed-6e3c-467a-8f5c-89da9d1b516b')
     def test_delete_non_existent_tenant(self):
-        # Attempt to delete a non existent tenant should fail
+        """Test deleting a non existent tenant via v2 API should fail"""
         self.assertRaises(lib_exc.NotFound, self.tenants_client.delete_tenant,
                           data_utils.rand_uuid_hex())
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('af16f44b-a849-46cb-9f13-a751c388f739')
     def test_tenant_create_duplicate(self):
-        # Tenant names should be unique
+        """Test tenant names should be unique via v2 API"""
         tenant_name = data_utils.rand_name(name='tenant')
         self.setup_test_tenant(name=tenant_name)
         self.assertRaises(lib_exc.Conflict, self.tenants_client.create_tenant,
@@ -78,7 +85,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d26b278a-6389-4702-8d6e-5980d80137e0')
     def test_create_tenant_by_unauthorized_user(self):
-        # Non-administrator user should not be authorized to create a tenant
+        """Test non-admin user creating a tenant via v2 API
+
+        Non-admin user should not be authorized to create a tenant via v2 API.
+        """
         tenant_name = data_utils.rand_name(name='tenant')
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_tenants_client.create_tenant,
@@ -87,7 +97,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a3ee9d7e-6920-4dd5-9321-d4b2b7f0a638')
     def test_create_tenant_request_without_token(self):
-        # Create tenant request without a token should not be authorized
+        """Test creating tenant without a token via v2 API is not allowed"""
         tenant_name = data_utils.rand_name(name='tenant')
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
@@ -99,7 +109,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5a2e4ca9-b0c0-486c-9c48-64a94fba2395')
     def test_create_tenant_with_empty_name(self):
-        # Tenant name should not be empty
+        """Test tenant name should not be empty via v2 API"""
         self.assertRaises(lib_exc.BadRequest,
                           self.tenants_client.create_tenant,
                           name='')
@@ -107,7 +117,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('2ff18d1e-dfe3-4359-9dc3-abf582c196b9')
     def test_create_tenants_name_length_over_64(self):
-        # Tenant name length should not be greater than 64 characters
+        """Test tenant name length should not exceed 64 via v2 API"""
         tenant_name = 'a' * 65
         self.assertRaises(lib_exc.BadRequest,
                           self.tenants_client.create_tenant,
@@ -116,14 +126,17 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('bd20dc2a-9557-4db7-b755-f48d952ad706')
     def test_update_non_existent_tenant(self):
-        # Attempt to update a non existent tenant should fail
+        """Test updating a non existent tenant via v2 API should fail"""
         self.assertRaises(lib_exc.NotFound, self.tenants_client.update_tenant,
                           data_utils.rand_uuid_hex())
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('41704dc5-c5f7-4f79-abfa-76e6fedc570b')
     def test_tenant_update_by_unauthorized_user(self):
-        # Non-administrator user should not be able to update a tenant
+        """Test non-admin user updating a tenant via v2 API
+
+        Non-admin user should not be able to update a tenant via v2 API
+        """
         tenant = self.setup_test_tenant()
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_tenants_client.update_tenant,
@@ -132,7 +145,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7a421573-72c7-4c22-a98e-ce539219c657')
     def test_tenant_update_request_without_token(self):
-        # Request to update a tenant without a valid token should fail
+        """Test updating a tenant without a valid token via v2 API
+
+        Updating a tenant without a valid token via v2 API should fail
+        """
         tenant = self.setup_test_tenant()
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
diff --git a/tempest/api/identity/admin/v2/test_tenants.py b/tempest/api/identity/admin/v2/test_tenants.py
index f68754e..5f73e1c 100644
--- a/tempest/api/identity/admin/v2/test_tenants.py
+++ b/tempest/api/identity/admin/v2/test_tenants.py
@@ -19,10 +19,14 @@
 
 
 class TenantsTestJSON(base.BaseIdentityV2AdminTest):
+    """Test identity tenants via v2 API"""
 
     @decorators.idempotent_id('16c6e05c-6112-4b0e-b83f-5e43f221b6b0')
     def test_tenant_list_delete(self):
-        # Create several tenants and delete them
+        """Test listing and deleting tenants via v2 API
+
+        Create several tenants and delete them
+        """
         tenants = []
         for _ in range(3):
             tenant = self.setup_test_tenant()
@@ -41,7 +45,7 @@
 
     @decorators.idempotent_id('d25e9f24-1310-4d29-b61b-d91299c21d6d')
     def test_tenant_create_with_description(self):
-        # Create tenant with a description
+        """Test creating tenant with a description via v2 API"""
         tenant_desc = data_utils.rand_name(name='desc')
         tenant = self.setup_test_tenant(description=tenant_desc)
         tenant_id = tenant['id']
@@ -56,7 +60,7 @@
 
     @decorators.idempotent_id('670bdddc-1cd7-41c7-b8e2-751cfb67df50')
     def test_tenant_create_enabled(self):
-        # Create a tenant that is enabled
+        """Test creating a tenant that is enabled via v2 API"""
         tenant = self.setup_test_tenant(enabled=True)
         tenant_id = tenant['id']
         self.assertTrue(tenant['enabled'], 'Enable should be True in response')
@@ -66,7 +70,7 @@
 
     @decorators.idempotent_id('3be22093-b30f-499d-b772-38340e5e16fb')
     def test_tenant_create_not_enabled(self):
-        # Create a tenant that is not enabled
+        """Test creating a tenant that is not enabled via v2 API"""
         tenant = self.setup_test_tenant(enabled=False)
         tenant_id = tenant['id']
         self.assertFalse(tenant['enabled'],
@@ -78,7 +82,7 @@
 
     @decorators.idempotent_id('781f2266-d128-47f3-8bdb-f70970add238')
     def test_tenant_update_name(self):
-        # Update name attribute of a tenant
+        """Test updating name attribute of a tenant via v2 API"""
         t_name1 = data_utils.rand_name(name='tenant')
         tenant = self.setup_test_tenant(name=t_name1)
         t_id = tenant['id']
@@ -100,7 +104,7 @@
 
     @decorators.idempotent_id('859fcfe1-3a03-41ef-86f9-b19a47d1cd87')
     def test_tenant_update_desc(self):
-        # Update description attribute of a tenant
+        """Test updating description attribute of a tenant via v2 API"""
         t_desc = data_utils.rand_name(name='desc')
         tenant = self.setup_test_tenant(description=t_desc)
         t_id = tenant['id']
@@ -123,7 +127,7 @@
 
     @decorators.idempotent_id('8fc8981f-f12d-4c66-9972-2bdcf2bc2e1a')
     def test_tenant_update_enable(self):
-        # Update the enabled attribute of a tenant
+        """Test updating the enabled attribute of a tenant via v2 API"""
         t_en = False
         tenant = self.setup_test_tenant(enabled=t_en)
         t_id = tenant['id']
diff --git a/tempest/api/identity/admin/v2/test_tokens.py b/tempest/api/identity/admin/v2/test_tokens.py
index 6ce1a8b..5d89f9d 100644
--- a/tempest/api/identity/admin/v2/test_tokens.py
+++ b/tempest/api/identity/admin/v2/test_tokens.py
@@ -23,9 +23,11 @@
 
 
 class TokensTestJSON(base.BaseIdentityV2AdminTest):
+    """Test keystone tokens via v2 API"""
 
     @decorators.idempotent_id('453ad4d5-e486-4b2f-be72-cffc8149e586')
     def test_create_check_get_delete_token(self):
+        """Test getting create/check/get/delete token for user via v2 API"""
         # get a token by username and password
         user_name = data_utils.rand_name(name='user')
         user_password = data_utils.rand_password()
@@ -59,7 +61,7 @@
 
     @decorators.idempotent_id('25ba82ee-8a32-4ceb-8f50-8b8c71e8765e')
     def test_rescope_token(self):
-        """An unscoped token can be requested
+        """Test an unscoped token can be requested via v2 API
 
         That token can be used to request a scoped token.
         """
@@ -112,6 +114,7 @@
 
     @decorators.idempotent_id('ca3ea6f7-ed08-4a61-adbd-96906456ad31')
     def test_list_endpoints_for_token(self):
+        """Test listing endpoints for token via v2 API"""
         tempest_services = ['keystone', 'nova', 'neutron', 'swift', 'cinder',
                             'neutron']
         # get a token for the user
diff --git a/tempest/api/identity/admin/v2/test_tokens_negative.py b/tempest/api/identity/admin/v2/test_tokens_negative.py
index eb3e365..f2e41ff 100644
--- a/tempest/api/identity/admin/v2/test_tokens_negative.py
+++ b/tempest/api/identity/admin/v2/test_tokens_negative.py
@@ -19,12 +19,17 @@
 
 
 class TokensAdminTestNegative(base.BaseIdentityV2AdminTest):
+    """Negative tests of keystone tokens via v2 API"""
 
     credentials = ['primary', 'admin', 'alt']
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a0a0a600-4292-4364-99c5-922c834fdf05')
     def test_check_token_existence_negative(self):
+        """Test checking other tenant's token existence via v2 API
+
+        Checking other tenant's token existence via v2 API should fail.
+        """
         creds = self.os_primary.credentials
         creds_alt = self.os_alt.credentials
         username = creds.username
diff --git a/tempest/api/identity/admin/v2/test_users.py b/tempest/api/identity/admin/v2/test_users.py
index 0d98af5..57a321a 100644
--- a/tempest/api/identity/admin/v2/test_users.py
+++ b/tempest/api/identity/admin/v2/test_users.py
@@ -23,6 +23,7 @@
 
 
 class UsersTestJSON(base.BaseIdentityV2AdminTest):
+    """Test keystone users via v2 API"""
 
     @classmethod
     def resource_setup(cls):
@@ -33,14 +34,14 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('2d55a71e-da1d-4b43-9c03-d269fd93d905')
     def test_create_user(self):
-        # Create a user
+        """Test creating a user via v2 API"""
         tenant = self.setup_test_tenant()
         user = self.create_test_user(name=self.alt_user, tenantId=tenant['id'])
         self.assertEqual(self.alt_user, user['name'])
 
     @decorators.idempotent_id('89d9fdb8-15c2-4304-a429-48715d0af33d')
     def test_create_user_with_enabled(self):
-        # Create a user with enabled : False
+        """Test creating a user with enabled : False via v2 API"""
         tenant = self.setup_test_tenant()
         name = data_utils.rand_name('test_user')
         user = self.create_test_user(name=name,
@@ -53,7 +54,7 @@
 
     @decorators.idempotent_id('39d05857-e8a5-4ed4-ba83-0b52d3ab97ee')
     def test_update_user(self):
-        # Test case to check if updating of user attributes is successful.
+        """Test updating user attributes via v2 API"""
         tenant = self.setup_test_tenant()
         user = self.create_test_user(tenantId=tenant['id'])
 
@@ -75,14 +76,14 @@
 
     @decorators.idempotent_id('29ed26f4-a74e-4425-9a85-fdb49fa269d2')
     def test_delete_user(self):
-        # Delete a user
+        """Test deleting a user via v2 API"""
         tenant = self.setup_test_tenant()
         user = self.create_test_user(tenantId=tenant['id'])
         self.users_client.delete_user(user['id'])
 
     @decorators.idempotent_id('aca696c3-d645-4f45-b728-63646045beb1')
     def test_user_authentication(self):
-        # Valid user's token is authenticated
+        """Test that valid user's token is authenticated via v2 API"""
         password = data_utils.rand_password()
         user = self.setup_test_user(password)
         tenant = self.tenants_client.show_tenant(user['tenantId'])['tenant']
@@ -97,6 +98,7 @@
 
     @decorators.idempotent_id('5d1fa498-4c2d-4732-a8fe-2b054598cfdd')
     def test_authentication_request_without_token(self):
+        """Test authentication request without token via v2 API"""
         # Request for token authentication with a valid token in header
         password = data_utils.rand_password()
         user = self.setup_test_user(password)
@@ -116,7 +118,10 @@
 
     @decorators.idempotent_id('a149c02e-e5e0-4b89-809e-7e8faf33ccda')
     def test_get_users(self):
-        # Get a list of users and find the test user
+        """Test getting users via v2 API
+
+        Get a list of users and find the test user
+        """
         user = self.setup_test_user()
         users = self.users_client.list_users()['users']
         self.assertThat([u['name'] for u in users],
@@ -125,7 +130,7 @@
 
     @decorators.idempotent_id('6e317209-383a-4bed-9f10-075b7c82c79a')
     def test_list_users_for_tenant(self):
-        # Return a list of all users for a tenant
+        """Test returning a list of all users for a tenant via v2 API"""
         tenant = self.setup_test_tenant()
         user_ids = list()
         fetched_user_ids = list()
@@ -147,7 +152,7 @@
 
     @decorators.idempotent_id('a8b54974-40e1-41c0-b812-50fc90827971')
     def test_list_users_with_roles_for_tenant(self):
-        # Return list of users on tenant when roles are assigned to users
+        """Test listing users on tenant with roles assigned via v2 API"""
         user = self.setup_test_user()
         tenant = self.tenants_client.show_tenant(user['tenantId'])['tenant']
         role = self.setup_test_role()
@@ -175,7 +180,7 @@
 
     @decorators.idempotent_id('1aeb25ac-6ec5-4d8b-97cb-7ac3567a989f')
     def test_update_user_password(self):
-        # Test case to check if updating of user password is successful.
+        """Test updating of user password via v2 API"""
         user = self.setup_test_user()
         tenant = self.tenants_client.show_tenant(user['tenantId'])['tenant']
         # Updating the user with new password
diff --git a/tempest/api/identity/admin/v2/test_users_negative.py b/tempest/api/identity/admin/v2/test_users_negative.py
index 4f47e41..eda1fdd 100644
--- a/tempest/api/identity/admin/v2/test_users_negative.py
+++ b/tempest/api/identity/admin/v2/test_users_negative.py
@@ -20,6 +20,7 @@
 
 
 class UsersNegativeTestJSON(base.BaseIdentityV2AdminTest):
+    """Negative tests of identity users via v2 API"""
 
     @classmethod
     def resource_setup(cls):
@@ -31,7 +32,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('60a1f5fa-5744-4cdf-82bf-60b7de2d29a4')
     def test_create_user_by_unauthorized_user(self):
-        # Non-administrator should not be authorized to create a user
+        """Non-admin should not be authorized to create a user via v2 API"""
         tenant = self.setup_test_tenant()
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_users_client.create_user,
@@ -42,7 +43,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d80d0c2f-4514-4d1e-806d-0930dfc5a187')
     def test_create_user_with_empty_name(self):
-        # User with an empty name should not be created
+        """User with an empty name should not be created via v2 API"""
         tenant = self.setup_test_tenant()
         self.assertRaises(lib_exc.BadRequest, self.users_client.create_user,
                           name='', password=self.alt_password,
@@ -52,7 +53,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7704b4f3-3b75-4b82-87cc-931d41c8f780')
     def test_create_user_with_name_length_over_255(self):
-        # Length of user name filed should be restricted to 255 characters
+        """Length of user name should not exceed 255 via v2 API"""
         tenant = self.setup_test_tenant()
         self.assertRaises(lib_exc.BadRequest, self.users_client.create_user,
                           name='a' * 256, password=self.alt_password,
@@ -62,7 +63,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('57ae8558-120c-4723-9308-3751474e7ecf')
     def test_create_user_with_duplicate_name(self):
-        # Duplicate user should not be created
+        """Duplicate user should not be created via v2 API"""
         password = data_utils.rand_password()
         user = self.setup_test_user(password)
         tenant = self.tenants_client.show_tenant(user['tenantId'])['tenant']
@@ -75,7 +76,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0132cc22-7c4f-42e1-9e50-ac6aad31d59a')
     def test_create_user_for_non_existent_tenant(self):
-        # Attempt to create a user in a non-existent tenant should fail
+        """Creating a user in a non-existent tenant via v2 API should fail"""
         self.assertRaises(lib_exc.NotFound, self.users_client.create_user,
                           name=self.alt_user,
                           password=self.alt_password,
@@ -85,7 +86,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('55bbb103-d1ae-437b-989b-bcdf8175c1f4')
     def test_create_user_request_without_a_token(self):
-        # Request to create a user without a valid token should fail
+        """Creating a user without a valid token via v2 API should fail"""
         tenant = self.setup_test_tenant()
         # Get the token of the current client
         token = self.client.auth_provider.get_token()
@@ -103,7 +104,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('23a2f3da-4a1a-41da-abdd-632328a861ad')
     def test_create_user_with_enabled_non_bool(self):
-        # Attempt to create a user with valid enabled para should fail
+        """Creating a user with invalid enabled para via v2 API should fail"""
         tenant = self.setup_test_tenant()
         name = data_utils.rand_name('test_user')
         self.assertRaises(lib_exc.BadRequest, self.users_client.create_user,
@@ -114,7 +115,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('3d07e294-27a0-4144-b780-a2a1bf6fee19')
     def test_update_user_for_non_existent_user(self):
-        # Attempt to update a user non-existent user should fail
+        """Updating a non-existent user via v2 API should fail"""
         user_name = data_utils.rand_name('user')
         non_existent_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.users_client.update_user,
@@ -123,7 +124,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('3cc2a64b-83aa-4b02-88f0-d6ab737c4466')
     def test_update_user_request_without_a_token(self):
-        # Request to update a user without a valid token should fail
+        """Updating a user without a valid token via v2 API should fail"""
 
         # Get the token of the current client
         token = self.client.auth_provider.get_token()
@@ -139,7 +140,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('424868d5-18a7-43e1-8903-a64f95ee3aac')
     def test_update_user_by_unauthorized_user(self):
-        # Non-administrator should not be authorized to update user
+        """Non-admin should not be authorized to update user via v2 API"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_users_client.update_user,
                           self.alt_user)
@@ -147,7 +148,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d45195d5-33ed-41b9-a452-7d0d6a00f6e9')
     def test_delete_users_by_unauthorized_user(self):
-        # Non-administrator user should not be authorized to delete a user
+        """Non-admin should not be authorized to delete a user via v2 API"""
         user = self.setup_test_user()
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_users_client.delete_user,
@@ -156,14 +157,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7cc82f7e-9998-4f89-abae-23df36495867')
     def test_delete_non_existent_user(self):
-        # Attempt to delete a non-existent user should fail
+        """Attempt to delete a non-existent user via v2 API should fail"""
         self.assertRaises(lib_exc.NotFound, self.users_client.delete_user,
                           'junk12345123')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('57fe1df8-0aa7-46c0-ae9f-c2e785c7504a')
     def test_delete_user_request_without_a_token(self):
-        # Request to delete a user without a valid token should fail
+        """Deleting a user without a valid token via v2 API should fail"""
 
         # Get the token of the current client
         token = self.client.auth_provider.get_token()
@@ -179,7 +180,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('593a4981-f6d4-460a-99a1-57a78bf20829')
     def test_authentication_for_disabled_user(self):
-        # Disabled user's token should not get authenticated
+        """Disabled user's token should not get authenticated via v2 API"""
         password = data_utils.rand_password()
         user = self.setup_test_user(password)
         tenant = self.tenants_client.show_tenant(user['tenantId'])['tenant']
@@ -192,7 +193,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('440a7a8d-9328-4b7b-83e0-d717010495e4')
     def test_authentication_when_tenant_is_disabled(self):
-        # User's token for a disabled tenant should not be authenticated
+        """Test User's token for a disabled tenant via v2 API
+
+        User's token for a disabled tenant should not be authenticated via
+        v2 API.
+        """
         password = data_utils.rand_password()
         user = self.setup_test_user(password)
         tenant = self.tenants_client.show_tenant(user['tenantId'])['tenant']
@@ -205,7 +210,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('921f1ad6-7907-40b8-853f-637e7ee52178')
     def test_authentication_with_invalid_tenant(self):
-        # User's token for an invalid tenant should not be authenticated
+        """Test User's token for an invalid tenant via v2 API
+
+        User's token for an invalid tenant should not be authenticated via V2
+        API.
+        """
         password = data_utils.rand_password()
         user = self.setup_test_user(password)
         self.assertRaises(lib_exc.Unauthorized, self.token_client.auth,
@@ -216,7 +225,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('bde9aecd-3b1c-4079-858f-beb5deaa5b5e')
     def test_authentication_with_invalid_username(self):
-        # Non-existent user's token should not get authenticated
+        """Non-existent user's token should not get authorized via v2 API"""
         password = data_utils.rand_password()
         user = self.setup_test_user(password)
         tenant = self.tenants_client.show_tenant(user['tenantId'])['tenant']
@@ -226,7 +235,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d5308b33-3574-43c3-8d87-1c090c5e1eca')
     def test_authentication_with_invalid_password(self):
-        # User's token with invalid password should not be authenticated
+        """Test User's token with invalid password via v2 API
+
+        User's token with invalid password should not be authenticated via V2
+        API.
+        """
         user = self.setup_test_user()
         tenant = self.tenants_client.show_tenant(user['tenantId'])['tenant']
         self.assertRaises(lib_exc.Unauthorized, self.token_client.auth,
@@ -235,14 +248,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('284192ce-fb7c-4909-a63b-9a502e0ddd11')
     def test_get_users_by_unauthorized_user(self):
-        # Non-administrator user should not be authorized to get user list
+        """Non-admin should not be authorized to get user list via v2 API"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_users_client.list_users)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a73591ec-1903-4ffe-be42-282b39fefc9d')
     def test_get_users_request_without_token(self):
-        # Request to get list of users without a valid token should fail
+        """Listing users without a valid token via v2 API should fail"""
         token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
 
@@ -254,8 +267,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f5d39046-fc5f-425c-b29e-bac2632da28e')
     def test_list_users_with_invalid_tenant(self):
-        # Should not be able to return a list of all
-        # users for a non-existent tenant
+        """Listing users for a non-existent tenant via v2 API should fail"""
         # Assign invalid tenant ids
         invalid_id = list()
         invalid_id.append(data_utils.rand_name('999'))
diff --git a/tempest/api/identity/admin/v3/test_application_credentials.py b/tempest/api/identity/admin/v3/test_application_credentials.py
index 7e802c6..c9cafd8 100644
--- a/tempest/api/identity/admin/v3/test_application_credentials.py
+++ b/tempest/api/identity/admin/v3/test_application_credentials.py
@@ -20,9 +20,11 @@
 
 class ApplicationCredentialsV3AdminTest(base.BaseApplicationCredentialsV3Test,
                                         base.BaseIdentityV3AdminTest):
+    """Test keystone application credentials"""
 
     @decorators.idempotent_id('3b3dd48f-3388-406a-a9e6-4d078a552d0e')
     def test_create_application_credential_with_roles(self):
+        """Test creating keystone application credential with roles"""
         role = self.setup_test_role()
         self.os_admin.roles_v3_client.create_user_role_on_project(
             self.project_id,
diff --git a/tempest/api/identity/admin/v3/test_credentials.py b/tempest/api/identity/admin/v3/test_credentials.py
index 23fe788..441f10f 100644
--- a/tempest/api/identity/admin/v3/test_credentials.py
+++ b/tempest/api/identity/admin/v3/test_credentials.py
@@ -20,6 +20,8 @@
 
 
 class CredentialsTestJSON(base.BaseIdentityV3AdminTest):
+    """Test keystone credentials"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -47,6 +49,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('7cd59bf9-bda4-4c72-9467-d21cab278355')
     def test_credentials_create_get_update_delete(self):
+        """Test creating, getting, updating, deleting of credentials"""
         blob = '{"access": "%s", "secret": "%s"}' % (
             data_utils.rand_name('Access'), data_utils.rand_name('Secret'))
         cred = self.creds_client.create_credential(
@@ -82,6 +85,7 @@
 
     @decorators.idempotent_id('13202c00-0021-42a1-88d4-81b44d448aab')
     def test_credentials_list_delete(self):
+        """Test listing credentials"""
         created_cred_ids = list()
         fetched_cred_ids = list()
 
diff --git a/tempest/api/identity/admin/v3/test_domain_configuration.py b/tempest/api/identity/admin/v3/test_domain_configuration.py
index c0b18ca..a246a36 100644
--- a/tempest/api/identity/admin/v3/test_domain_configuration.py
+++ b/tempest/api/identity/admin/v3/test_domain_configuration.py
@@ -21,6 +21,8 @@
 
 
 class DomainConfigurationTestJSON(base.BaseIdentityV3AdminTest):
+    """Test domain configuration"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -51,10 +53,12 @@
 
     @decorators.idempotent_id('11a02bf0-6f94-4380-b3b0-c8dc18fc0d22')
     def test_show_default_group_config_and_options(self):
-        # The API supports only the identity and ldap groups. For the ldap
-        # group, a valid value is url or user_tree_dn. For the identity group,
-        # a valid value is driver.
+        """Test showing default keystone group config and options
 
+        The API supports only the identity and ldap groups. For the ldap
+        group, a valid value is url or user_tree_dn. For the identity group,
+        a valid value is driver.
+        """
         # Check that the default config has the identity and ldap groups.
         config = self.client.show_default_config_settings()['config']
         self.assertIsInstance(config, dict)
@@ -93,6 +97,7 @@
 
     @decorators.idempotent_id('9e3ff13c-f597-4f01-9377-d6c06c2a1477')
     def test_create_domain_config_and_show_config_groups_and_options(self):
+        """Test creating and showing keystone config groups and options"""
         domain, created_config = self._create_domain_and_config(
             self.custom_config)
 
@@ -117,6 +122,7 @@
 
     @decorators.idempotent_id('7161023e-5dd0-4612-9da0-1bac6ac30b63')
     def test_create_update_and_delete_domain_config(self):
+        """Test creating, updating and deleting keystone domain config"""
         domain, created_config = self._create_domain_and_config(
             self.custom_config)
 
@@ -140,6 +146,7 @@
 
     @decorators.idempotent_id('c7510fa2-6661-4170-9c6b-4783a80651e9')
     def test_create_update_and_delete_domain_config_groups_and_opts(self):
+        """Test create/update/delete keystone domain config groups and opts"""
         domain, _ = self._create_domain_and_config(self.custom_config)
 
         # Check that updating configuration groups work.
diff --git a/tempest/api/identity/admin/v3/test_domains.py b/tempest/api/identity/admin/v3/test_domains.py
index 07175f4..32ccb9e 100644
--- a/tempest/api/identity/admin/v3/test_domains.py
+++ b/tempest/api/identity/admin/v3/test_domains.py
@@ -24,6 +24,7 @@
 
 
 class DomainsTestJSON(base.BaseIdentityV3AdminTest):
+    """Test identity domains"""
 
     @classmethod
     def resource_setup(cls):
@@ -37,7 +38,7 @@
 
     @decorators.idempotent_id('8cf516ef-2114-48f1-907b-d32726c734d4')
     def test_list_domains(self):
-        # Test to list domains
+        """Test listing domains"""
         fetched_ids = list()
         # List and Verify Domains
         body = self.domains_client.list_domains()['domains']
@@ -49,7 +50,7 @@
 
     @decorators.idempotent_id('c6aee07b-4981-440c-bb0b-eb598f58ffe9')
     def test_list_domains_filter_by_name(self):
-        # List domains filtering by name
+        """Test listing domains filtering by name"""
         params = {'name': self.setup_domains[0]['name']}
         fetched_domains = self.domains_client.list_domains(
             **params)['domains']
@@ -61,7 +62,7 @@
 
     @decorators.idempotent_id('3fd19840-65c1-43f8-b48c-51bdd066dff9')
     def test_list_domains_filter_by_enabled(self):
-        # List domains filtering by enabled domains
+        """Test listing domains filtering by enabled domains"""
         params = {'enabled': True}
         fetched_domains = self.domains_client.list_domains(
             **params)['domains']
@@ -74,6 +75,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('f2f5b44a-82e8-4dad-8084-0661ea3b18cf')
     def test_create_update_delete_domain(self):
+        """Test creating, updating and deleting domain"""
         # Create domain
         d_name = data_utils.rand_name('domain')
         d_desc = data_utils.rand_name('domain-desc')
@@ -118,6 +120,7 @@
 
     @decorators.idempotent_id('d8d318b7-d1b3-4c37-94c5-3c5ba0b121ea')
     def test_domain_delete_cascades_content(self):
+        """Test deleting domain will delete its associated contents"""
         # Create a domain with a user and a group in it
         domain = self.setup_test_domain()
         user = self.create_test_user(domain_id=domain['id'])
@@ -134,6 +137,7 @@
 
     @decorators.idempotent_id('036df86e-bb5d-42c0-a7c2-66b9db3a6046')
     def test_create_domain_with_disabled_status(self):
+        """Test creating domain with disabled status"""
         # Create domain with enabled status as false
         d_name = data_utils.rand_name('domain')
         d_desc = data_utils.rand_name('domain-desc')
@@ -146,6 +150,7 @@
 
     @decorators.idempotent_id('2abf8764-309a-4fa9-bc58-201b799817ad')
     def test_create_domain_without_description(self):
+        """Test creating domain without description"""
         # Create domain only with name
         d_name = data_utils.rand_name('domain')
         domain = self.domains_client.create_domain(name=d_name)['domain']
diff --git a/tempest/api/identity/admin/v3/test_domains_negative.py b/tempest/api/identity/admin/v3/test_domains_negative.py
index b3c68fb..c90206d 100644
--- a/tempest/api/identity/admin/v3/test_domains_negative.py
+++ b/tempest/api/identity/admin/v3/test_domains_negative.py
@@ -20,6 +20,8 @@
 
 
 class DomainsNegativeTestJSON(base.BaseIdentityV3AdminTest):
+    """Negative tests of identity domains"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -28,6 +30,7 @@
     @decorators.attr(type=['negative', 'gate'])
     @decorators.idempotent_id('1f3fbff5-4e44-400d-9ca1-d953f05f609b')
     def test_delete_active_domain(self):
+        """Test deleting active domain should fail"""
         domain = self.create_domain()
         domain_id = domain['id']
 
@@ -40,14 +43,20 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9018461d-7d24-408d-b3fe-ae37e8cd5c9e')
     def test_create_domain_with_empty_name(self):
-        # Domain name should not be empty
+        """Test creating domain with empty name should fail
+
+        Domain name should not be empty
+        """
         self.assertRaises(lib_exc.BadRequest,
                           self.domains_client.create_domain, name='')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('37b1bbf2-d664-4785-9a11-333438586eae')
     def test_create_domain_with_name_length_over_64(self):
-        # Domain name length should not ne greater than 64 characters
+        """Test creating domain with name over length
+
+        Domain name length should not ne greater than 64 characters
+        """
         d_name = 'a' * 65
         self.assertRaises(lib_exc.BadRequest,
                           self.domains_client.create_domain,
@@ -56,13 +65,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('43781c07-764f-4cf2-a405-953c1916f605')
     def test_delete_non_existent_domain(self):
-        # Attempt to delete a non existent domain should fail
+        """Test attempting to delete a non existent domain should fail"""
         self.assertRaises(lib_exc.NotFound, self.domains_client.delete_domain,
                           data_utils.rand_uuid_hex())
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e6f9e4a2-4f36-4be8-bdbc-4e199ae29427')
     def test_domain_create_duplicate(self):
+        """Test creating domain with duplicate name should fail"""
         domain_name = data_utils.rand_name('domain-dup')
         domain = self.domains_client.create_domain(name=domain_name)['domain']
         domain_id = domain['id']
diff --git a/tempest/api/identity/admin/v3/test_endpoint_groups.py b/tempest/api/identity/admin/v3/test_endpoint_groups.py
index 7d85dc9..2fa92e3 100644
--- a/tempest/api/identity/admin/v3/test_endpoint_groups.py
+++ b/tempest/api/identity/admin/v3/test_endpoint_groups.py
@@ -20,6 +20,8 @@
 
 
 class EndPointGroupsTest(base.BaseIdentityV3AdminTest):
+    """Test endpoint groups"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -68,6 +70,7 @@
 
     @decorators.idempotent_id('7c69e7a1-f865-402d-a2ea-44493017315a')
     def test_create_list_show_check_delete_endpoint_group(self):
+        """Test create/list/show/check/delete of endpoint group"""
         service_id = self._create_service()
         self.addCleanup(self.services_client.delete_service, service_id)
         name = data_utils.rand_name('service_group')
@@ -127,6 +130,7 @@
 
     @decorators.idempotent_id('51c8fc38-fa84-4e76-b5b6-6fc37770fb26')
     def test_update_endpoint_group(self):
+        """Test updating endpoint group"""
         # Creating an endpoint group so as to check update endpoint group
         # with new values
         service1_id = self._create_service()
diff --git a/tempest/api/identity/admin/v3/test_endpoints.py b/tempest/api/identity/admin/v3/test_endpoints.py
index 366d6a0..0199d73 100644
--- a/tempest/api/identity/admin/v3/test_endpoints.py
+++ b/tempest/api/identity/admin/v3/test_endpoints.py
@@ -20,6 +20,8 @@
 
 
 class EndPointsTestJSON(base.BaseIdentityV3AdminTest):
+    """Test keystone endpoints"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -71,6 +73,7 @@
 
     @decorators.idempotent_id('c19ecf90-240e-4e23-9966-21cee3f6a618')
     def test_list_endpoints(self):
+        """Test listing keystone endpoints by filters"""
         # Get the list of all the endpoints.
         fetched_endpoints = self.client.list_endpoints()['endpoints']
         fetched_endpoint_ids = [e['id'] for e in fetched_endpoints]
@@ -111,6 +114,7 @@
 
     @decorators.idempotent_id('0e2446d2-c1fd-461b-a729-b9e73e3e3b37')
     def test_create_list_show_delete_endpoint(self):
+        """Test creating, listing, showing and deleting keystone endpoint"""
         region_name = data_utils.rand_name('region')
         url = data_utils.rand_url()
         interface = 'public'
@@ -152,6 +156,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('37e8f15e-ee7c-4657-a1e7-f6b61e375eff')
     def test_update_endpoint(self):
+        """Test updating keystone endpoint"""
         # NOTE(zhufl) Service2 should be created before endpoint_for_update
         # is created, because Service2 must be deleted after
         # endpoint_for_update is deleted, otherwise we will get a 404 error
diff --git a/tempest/api/identity/admin/v3/test_endpoints_negative.py b/tempest/api/identity/admin/v3/test_endpoints_negative.py
index 164b577..9689d87 100644
--- a/tempest/api/identity/admin/v3/test_endpoints_negative.py
+++ b/tempest/api/identity/admin/v3/test_endpoints_negative.py
@@ -20,6 +20,8 @@
 
 
 class EndpointsNegativeTestJSON(base.BaseIdentityV3AdminTest):
+    """Negative tests of endpoint"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -48,7 +50,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ac6c137e-4d3d-448f-8c83-4f13d0942651')
     def test_create_with_enabled_False(self):
-        # Enabled should be a boolean, not a string like 'False'
+        """Test creating endpoint with invalid enabled value 'False'
+
+        Enabled should be a boolean, not a string like 'False'
+        """
         interface = 'public'
         url = data_utils.rand_url()
         region = data_utils.rand_name('region')
@@ -59,7 +64,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9c43181e-0627-484a-8c79-923e8a59598b')
     def test_create_with_enabled_True(self):
-        # Enabled should be a boolean, not a string like 'True'
+        """Test creating endpoint with invalid enabled value 'True'
+
+        Enabled should be a boolean, not a string like 'True'
+        """
         interface = 'public'
         url = data_utils.rand_url()
         region = data_utils.rand_name('region')
@@ -88,11 +96,17 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('65e41f32-5eb7-498f-a92a-a6ccacf7439a')
     def test_update_with_enabled_False(self):
-        # Enabled should be a boolean, not a string like 'False'
+        """Test updating endpoint with invalid enabled value 'False'
+
+        Enabled should be a boolean, not a string like 'False'
+        """
         self._assert_update_raises_bad_request('False')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('faba3587-f066-4757-a48e-b4a3f01803bb')
     def test_update_with_enabled_True(self):
-        # Enabled should be a boolean, not a string like 'True'
+        """Test updating endpoint with invalid enabled value 'True'
+
+        Enabled should be a boolean, not a string like 'True'
+        """
         self._assert_update_raises_bad_request('True')
diff --git a/tempest/api/identity/admin/v3/test_groups.py b/tempest/api/identity/admin/v3/test_groups.py
index 2dd1fe2..b2e3775 100644
--- a/tempest/api/identity/admin/v3/test_groups.py
+++ b/tempest/api/identity/admin/v3/test_groups.py
@@ -23,6 +23,8 @@
 
 
 class GroupsV3TestJSON(base.BaseIdentityV3AdminTest):
+    """Test keystone groups"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -35,6 +37,7 @@
 
     @decorators.idempotent_id('2e80343b-6c81-4ac3-88c7-452f3e9d5129')
     def test_group_create_update_get(self):
+        """Test creating, updating and getting keystone group"""
         # Verify group creation works.
         name = data_utils.rand_name('Group')
         description = data_utils.rand_name('Description')
@@ -78,6 +81,7 @@
                       'immutable user source and solely '
                       'provides read-only access to users.')
     def test_group_users_add_list_delete(self):
+        """Test adding/listing/deleting group users"""
         group = self.setup_test_group(domain_id=self.domain['id'])
         # add user into group
         users = []
@@ -104,6 +108,7 @@
                       'immutable user source and solely '
                       'provides read-only access to users.')
     def test_list_user_groups(self):
+        """Test listing user groups when the user is in two groups"""
         # create a user
         user = self.create_test_user()
         # create two groups, and add user into them
@@ -127,7 +132,7 @@
 
     @decorators.idempotent_id('cc9a57a5-a9ed-4f2d-a29f-4f979a06ec71')
     def test_list_groups(self):
-        # Test to list groups
+        """Test listing groups"""
         group_ids = list()
         fetched_ids = list()
         for _ in range(3):
diff --git a/tempest/api/identity/admin/v3/test_inherits.py b/tempest/api/identity/admin/v3/test_inherits.py
index 2672f71..cababc6 100644
--- a/tempest/api/identity/admin/v3/test_inherits.py
+++ b/tempest/api/identity/admin/v3/test_inherits.py
@@ -21,6 +21,8 @@
 
 
 class InheritsV3TestJSON(base.BaseIdentityV3AdminTest):
+    """Test keystone inherits"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -72,6 +74,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_inherit_assign_list_check_revoke_roles_on_domains_user(self):
+        """Test assign/list/check/revoke inherited role on domain user"""
         # Create role
         src_role = self.setup_test_role()
         # Assign role on domains user
@@ -96,6 +99,7 @@
 
     @decorators.idempotent_id('c7a8dda2-be50-4fb4-9a9c-e830771078b1')
     def test_inherit_assign_list_check_revoke_roles_on_domains_group(self):
+        """Test assign/list/check/revoke inherited role on domain group"""
         # Create role
         src_role = self.setup_test_role()
         # Assign role on domains group
@@ -123,6 +127,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_inherit_assign_check_revoke_roles_on_projects_user(self):
+        """Test assign/list/check/revoke inherited role on project user"""
         # Create role
         src_role = self.setup_test_role()
         # Assign role on projects user
@@ -138,6 +143,7 @@
 
     @decorators.idempotent_id('26021436-d5a4-4256-943c-ded01e0d4b45')
     def test_inherit_assign_check_revoke_roles_on_projects_group(self):
+        """Test assign/list/check/revoke inherited role on project group"""
         # Create role
         src_role = self.setup_test_role()
         # Assign role on projects group
@@ -157,6 +163,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_inherit_assign_list_revoke_user_roles_on_domain(self):
+        """Test assign/list/check/revoke inherited role on domain"""
         # Create role
         src_role = self.setup_test_role()
 
@@ -204,6 +211,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_inherit_assign_list_revoke_user_roles_on_project_tree(self):
+        """Test assign/list/check/revoke inherited role on project tree"""
         # Create role
         src_role = self.setup_test_role()
 
diff --git a/tempest/api/identity/admin/v3/test_list_projects.py b/tempest/api/identity/admin/v3/test_list_projects.py
index cb8ea11..b33d8bd 100644
--- a/tempest/api/identity/admin/v3/test_list_projects.py
+++ b/tempest/api/identity/admin/v3/test_list_projects.py
@@ -40,6 +40,7 @@
 
 
 class ListProjectsTestJSON(BaseListProjectsTestJSON):
+    """Test listing projects"""
 
     @classmethod
     def resource_setup(cls):
@@ -65,13 +66,13 @@
 
     @decorators.idempotent_id('0fe7a334-675a-4509-b00e-1c4b95d5dae8')
     def test_list_projects_with_enabled(self):
-        # List the projects with enabled
+        """Test listing the projects with enabled"""
         self._list_projects_with_params(
             [self.p1], [self.p2, self.p3], {'enabled': False}, 'enabled')
 
     @decorators.idempotent_id('6edc66f5-2941-4a17-9526-4073311c1fac')
     def test_list_projects_with_parent(self):
-        # List projects with parent
+        """Test listing projects with parent"""
         params = {'parent_id': self.p3['parent_id']}
         fetched_projects = self.projects_client.list_projects(
             params)['projects']
@@ -81,6 +82,11 @@
 
 
 class ListProjectsStaticTestJSON(BaseListProjectsTestJSON):
+    """Test listing projects
+
+    These tests can be executed in clouds using the pre-provisioned users
+    """
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -102,7 +108,7 @@
 
     @decorators.idempotent_id('1d830662-22ad-427c-8c3e-4ec854b0af44')
     def test_list_projects(self):
-        # List projects
+        """Test listing projects"""
         list_projects = self.projects_client.list_projects()['projects']
 
         for p in [self.p1, self.p2]:
@@ -112,13 +118,13 @@
 
     @decorators.idempotent_id('fa178524-4e6d-4925-907c-7ab9f42c7e26')
     def test_list_projects_with_name(self):
-        # List projects with name
+        """Test listing projects filtered by name"""
         self._list_projects_with_params(
             [self.p1], [self.p2], {'name': self.p1['name']}, 'name')
 
     @decorators.idempotent_id('fab13f3c-f6a6-4b9f-829b-d32fd44fdf10')
     def test_list_projects_with_domains(self):
-        # Verify project list filtered by domain
+        """Test listing projects filtered by domain"""
         key = 'domain_id'
         for p in [self.p1, self.p2]:
             params = {key: p[key]}
diff --git a/tempest/api/identity/admin/v3/test_projects.py b/tempest/api/identity/admin/v3/test_projects.py
index e46145d..be1216a 100644
--- a/tempest/api/identity/admin/v3/test_projects.py
+++ b/tempest/api/identity/admin/v3/test_projects.py
@@ -23,6 +23,8 @@
 
 
 class ProjectsTestJSON(base.BaseIdentityV3AdminTest):
+    """Test identity projects"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -30,7 +32,7 @@
 
     @decorators.idempotent_id('0ecf465c-0dc4-4532-ab53-91ffeb74d12d')
     def test_project_create_with_description(self):
-        # Create project with a description
+        """Test creating project with a description"""
         project_desc = data_utils.rand_name('desc')
         project = self.setup_test_project(description=project_desc)
         project_id = project['id']
@@ -44,7 +46,7 @@
 
     @decorators.idempotent_id('5f50fe07-8166-430b-a882-3b2ee0abe26f')
     def test_project_create_with_domain(self):
-        # Create project with a domain
+        """Test creating project with a domain"""
         domain = self.setup_test_domain()
         project_name = data_utils.rand_name('project')
         project = self.setup_test_project(
@@ -58,7 +60,7 @@
 
     @decorators.idempotent_id('1854f9c0-70bc-4d11-a08a-1c789d339e3d')
     def test_project_create_with_parent(self):
-        # Create root project without providing a parent_id
+        """Test creating root project without providing a parent_id"""
         domain = self.setup_test_domain()
         domain_id = domain['id']
 
@@ -83,6 +85,7 @@
 
     @decorators.idempotent_id('a7eb9416-6f9b-4dbb-b71b-7f73aaef59d5')
     def test_create_is_domain_project(self):
+        """Test creating is_domain project"""
         project = self.setup_test_project(domain_id=None, is_domain=True)
         # To delete a domain, we need to disable it first
         self.addCleanup(self.projects_client.update_project, project['id'],
@@ -103,7 +106,7 @@
 
     @decorators.idempotent_id('1f66dc76-50cc-4741-a200-af984509e480')
     def test_project_create_enabled(self):
-        # Create a project that is enabled
+        """Test creating a project that is enabled"""
         project = self.setup_test_project(enabled=True)
         project_id = project['id']
         self.assertTrue(project['enabled'],
@@ -113,7 +116,7 @@
 
     @decorators.idempotent_id('78f96a9c-e0e0-4ee6-a3ba-fbf6dfd03207')
     def test_project_create_not_enabled(self):
-        # Create a project that is not enabled
+        """Test creating a project that is not enabled"""
         project = self.setup_test_project(enabled=False)
         self.assertFalse(project['enabled'],
                          'Enable should be False in response')
@@ -123,7 +126,7 @@
 
     @decorators.idempotent_id('f608f368-048c-496b-ad63-d286c26dab6b')
     def test_project_update_name(self):
-        # Update name attribute of a project
+        """Test updating name attribute of a project"""
         p_name1 = data_utils.rand_name('project')
         project = self.setup_test_project(name=p_name1)
 
@@ -144,7 +147,7 @@
 
     @decorators.idempotent_id('f138b715-255e-4a7d-871d-351e1ef2e153')
     def test_project_update_desc(self):
-        # Update description attribute of a project
+        """Test updating description attribute of a project"""
         p_desc = data_utils.rand_name('desc')
         project = self.setup_test_project(description=p_desc)
         resp1_desc = project['description']
@@ -164,7 +167,7 @@
 
     @decorators.idempotent_id('b6b25683-c97f-474d-a595-55d410b68100')
     def test_project_update_enable(self):
-        # Update the enabled attribute of a project
+        """Test updating the enabled attribute of a project"""
         p_en = False
         project = self.setup_test_project(enabled=p_en)
 
@@ -189,7 +192,7 @@
                       'immutable user source and solely '
                       'provides read-only access to users.')
     def test_associate_user_to_project(self):
-        # Associate a user to a project
+        """Test associating a user to a project"""
         # Create a Project
         project = self.setup_test_project()
 
@@ -215,6 +218,7 @@
 
     @decorators.idempotent_id('d1db68b6-aebe-4fa0-b79d-d724d2e21162')
     def test_project_get_equals_list(self):
+        """Test the result of getting project equals that of listing"""
         fields = ['parent_id', 'is_domain', 'description', 'links',
                   'name', 'enabled', 'domain_id', 'id', 'tags']
 
diff --git a/tempest/api/identity/admin/v3/test_projects_negative.py b/tempest/api/identity/admin/v3/test_projects_negative.py
index 12f1d4a..79e3d29 100644
--- a/tempest/api/identity/admin/v3/test_projects_negative.py
+++ b/tempest/api/identity/admin/v3/test_projects_negative.py
@@ -20,11 +20,12 @@
 
 
 class ProjectsNegativeTestJSON(base.BaseIdentityV3AdminTest):
+    """Negative tests of projects"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8d68c012-89e0-4394-8d6b-ccd7196def97')
     def test_project_delete_by_unauthorized_user(self):
-        # Non-admin user should not be able to delete a project
+        """Non-admin user should not be able to delete a project"""
         project = self.setup_test_project()
         self.assertRaises(
             lib_exc.Forbidden, self.non_admin_projects_client.delete_project,
@@ -32,6 +33,11 @@
 
 
 class ProjectsNegativeStaticTestJSON(base.BaseIdentityV3AdminTest):
+    """Negative tests of projects
+
+    These tests can be executed in clouds using the pre-provisioned users
+    """
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -40,14 +46,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('24c49279-45dd-4155-887a-cb738c2385aa')
     def test_list_projects_by_unauthorized_user(self):
-        # Non-admin user should not be able to list projects
+        """Non-admin user should not be able to list projects"""
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_projects_client.list_projects)
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('874c3e84-d174-4348-a16b-8c01f599561b')
     def test_project_create_duplicate(self):
-        # Project names should be unique
+        """Project names should be unique"""
         project_name = data_utils.rand_name('project-dup')
         self.setup_test_project(name=project_name)
 
@@ -57,7 +63,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8fba9de2-3e1f-4e77-812a-60cb68f8df13')
     def test_create_project_by_unauthorized_user(self):
-        # Non-admin user should not be authorized to create a project
+        """Non-admin user should not be authorized to create a project"""
         project_name = data_utils.rand_name('project')
         self.assertRaises(
             lib_exc.Forbidden, self.non_admin_projects_client.create_project,
@@ -66,14 +72,14 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7828db17-95e5-475b-9432-9a51b4aa79a9')
     def test_create_project_with_empty_name(self):
-        # Project name should not be empty
+        """Project name should not be empty"""
         self.assertRaises(lib_exc.BadRequest,
                           self.projects_client.create_project, name='')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('502b6ceb-b0c8-4422-bf53-f08fdb21e2f0')
     def test_create_projects_name_length_over_64(self):
-        # Project name length should not be greater than 64 characters
+        """Project name length should not be greater than 64 characters"""
         project_name = 'a' * 65
         self.assertRaises(lib_exc.BadRequest,
                           self.projects_client.create_project, project_name)
@@ -81,7 +87,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7965b581-60c1-43b7-8169-95d4ab7fc6fb')
     def test_delete_non_existent_project(self):
-        # Attempt to delete a non existent project should fail
+        """Attempt to delete a non existent project should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.projects_client.delete_project,
                           data_utils.rand_uuid_hex())
diff --git a/tempest/api/identity/admin/v3/test_regions.py b/tempest/api/identity/admin/v3/test_regions.py
index c8c0151..63e456e 100644
--- a/tempest/api/identity/admin/v3/test_regions.py
+++ b/tempest/api/identity/admin/v3/test_regions.py
@@ -20,6 +20,8 @@
 
 
 class RegionsTestJSON(base.BaseIdentityV3AdminTest):
+    """Test regions"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -44,6 +46,7 @@
 
     @decorators.idempotent_id('56186092-82e4-43f2-b954-91013218ba42')
     def test_create_update_get_delete_region(self):
+        """Test creating, updating, getting and updating region"""
         # Create region
         r_description = data_utils.rand_name('description')
         region = self.client.create_region(
@@ -81,7 +84,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('2c12c5b5-efcf-4aa5-90c5-bff1ab0cdbe2')
     def test_create_region_with_specific_id(self):
-        # Create a region with a specific id
+        """Test creating region with specific id"""
         r_region_id = data_utils.rand_uuid()
         r_description = data_utils.rand_name('description')
         region = self.client.create_region(
@@ -93,7 +96,7 @@
 
     @decorators.idempotent_id('d180bf99-544a-445c-ad0d-0c0d27663796')
     def test_list_regions(self):
-        # Get a list of regions
+        """Test getting a list of regions"""
         fetched_regions = self.client.list_regions()['regions']
         missing_regions =\
             [e for e in self.setup_regions if e not in fetched_regions]
@@ -104,6 +107,7 @@
 
     @decorators.idempotent_id('2d1057cb-bbde-413a-acdf-e2d265284542')
     def test_list_regions_filter_by_parent_region_id(self):
+        """Test listing regions filtered by parent region id"""
         # Add a sub-region to one of the existing test regions
         r_description = data_utils.rand_name('description')
         region = self.client.create_region(
diff --git a/tempest/api/identity/admin/v3/test_roles.py b/tempest/api/identity/admin/v3/test_roles.py
index 5ba4c9f..dd7d5af 100644
--- a/tempest/api/identity/admin/v3/test_roles.py
+++ b/tempest/api/identity/admin/v3/test_roles.py
@@ -25,6 +25,8 @@
 
 
 class RolesV3TestJSON(base.BaseIdentityV3AdminTest):
+    """Test roles"""
+
     # NOTE: force_tenant_isolation is true in the base class by default but
     # overridden to false here to allow test execution for clouds using the
     # pre-provisioned credentials provider.
@@ -75,6 +77,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('18afc6c0-46cf-4911-824e-9989cc056c3a')
     def test_role_create_update_show_list(self):
+        """Test creating, updating, showing and listing a role"""
         r_name = data_utils.rand_name('Role')
         role = self.roles_client.create_role(name=r_name)['role']
         self.addCleanup(self.roles_client.delete_role, role['id'])
@@ -101,6 +104,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_grant_list_revoke_role_to_user_on_project(self):
+        """Test granting, listing, revoking role to user on project"""
         self.roles_client.create_user_role_on_project(self.project['id'],
                                                       self.user_body['id'],
                                                       self.role['id'])
@@ -122,6 +126,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_grant_list_revoke_role_to_user_on_domain(self):
+        """Test granting, listing, revoking role to user on domain"""
         self.roles_client.create_user_role_on_domain(
             self.domain['id'], self.user_body['id'], self.role['id'])
 
@@ -142,6 +147,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_grant_list_revoke_role_to_group_on_project(self):
+        """Test granting, listing, revoking role to group on project"""
         # Grant role to group on project
         self.roles_client.create_group_role_on_project(
             self.project['id'], self.group_body['id'], self.role['id'])
@@ -175,6 +181,7 @@
 
     @decorators.idempotent_id('4bf8a70b-e785-413a-ad53-9f91ce02faa7')
     def test_grant_list_revoke_role_to_group_on_domain(self):
+        """Test granting, listing, revoking role to group on domain"""
         self.roles_client.create_group_role_on_domain(
             self.domain['id'], self.group_body['id'], self.role['id'])
 
@@ -192,6 +199,7 @@
 
     @decorators.idempotent_id('f5654bcc-08c4-4f71-88fe-05d64e06de94')
     def test_list_roles(self):
+        """Test listing roles"""
         # Return a list of all roles
         body = self.roles_client.list_roles()['roles']
         found = [role for role in body if role in self.roles]
@@ -215,6 +223,7 @@
 
     @decorators.idempotent_id('c90c316c-d706-4728-bcba-eb1912081b69')
     def test_implied_roles_create_check_show_delete(self):
+        """Test creating, checking, showing and deleting implied roles"""
         prior_role_id = self.roles[0]['id']
         implies_role_id = self.roles[1]['id']
 
@@ -248,6 +257,7 @@
 
     @decorators.idempotent_id('dc6f5959-b74d-4e30-a9e5-a8255494ff00')
     def test_roles_hierarchy(self):
+        """Test creating implied role and listing role inferences rules"""
         # Create inference rule from "roles[0]" to "role[1]"
         self._create_implied_role(
             self.roles[0]['id'], self.roles[1]['id'])
@@ -280,6 +290,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_assignments_for_implied_roles_create_delete(self):
+        """Test assignments when implied roles are created and deleted"""
         # Create a grant using "roles[0]"
         self.roles_client.create_user_role_on_project(
             self.project['id'], self.user_body['id'], self.roles[0]['id'])
@@ -321,6 +332,7 @@
 
     @decorators.idempotent_id('d92a41d2-5501-497a-84bb-6e294330e8f8')
     def test_domain_roles_create_delete(self):
+        """Test creating, listing and deleting domain roles"""
         domain_role = self.roles_client.create_role(
             name=data_utils.rand_name('domain_role'),
             domain_id=self.domain['id'])['role']
@@ -341,6 +353,7 @@
 
     @decorators.idempotent_id('eb1e1c24-1bc4-4d47-9748-e127a1852c82')
     def test_implied_domain_roles(self):
+        """Test creating implied roles when roles are in domains"""
         # Create two roles in the same domain
         domain_role1 = self.setup_test_role(domain_id=self.domain['id'])
         domain_role2 = self.setup_test_role(domain_id=self.domain['id'])
@@ -373,6 +386,7 @@
                       'Skipped because environment has an immutable user '
                       'source and solely provides read-only access to users.')
     def test_assignments_for_domain_roles(self):
+        """Test assignments for domain roles"""
         domain_role = self.setup_test_role(domain_id=self.domain['id'])
 
         # Create a grant using "domain_role"
@@ -395,6 +409,7 @@
 
     @decorators.idempotent_id('3748c316-c18f-4b08-997b-c60567bc6235')
     def test_list_all_implied_roles(self):
+        """Test listing all implied roles"""
         # Create inference rule from "roles[0]" to "roles[1]"
         self._create_implied_role(
             self.roles[0]['id'], self.roles[1]['id'])
diff --git a/tempest/api/identity/admin/v3/test_tokens.py b/tempest/api/identity/admin/v3/test_tokens.py
index 5f1b58d..f3a7471 100644
--- a/tempest/api/identity/admin/v3/test_tokens.py
+++ b/tempest/api/identity/admin/v3/test_tokens.py
@@ -24,6 +24,7 @@
 
 
 class TokensV3TestJSON(base.BaseIdentityV3AdminTest):
+    """Test tokens"""
 
     credentials = ['primary', 'admin', 'alt']
 
@@ -123,6 +124,7 @@
 
     @decorators.idempotent_id('08ed85ce-2ba8-4864-b442-bcc61f16ae89')
     def test_get_available_project_scopes(self):
+        """Test getting available project scopes"""
         manager_project_id = self.os_primary.credentials.project_id
         admin_user_id = self.os_admin.credentials.user_id
         admin_role_id = self.get_role_by_name(CONF.identity.admin_role)['id']
@@ -152,10 +154,13 @@
 
     @decorators.idempotent_id('ec5ecb05-af64-4c04-ac86-4d9f6f12f185')
     def test_get_available_domain_scopes(self):
-        # Test for verifying that listing domain scopes for a user works if
-        # the user has a domain role or belongs to a group that has a domain
-        # role. For this test, admin client is used to add roles to alt user,
-        # which performs API calls, to avoid 401 Unauthorized errors.
+        """Test getting available domain scopes
+
+        To verify that listing domain scopes for a user works if
+        the user has a domain role or belongs to a group that has a domain
+        role. For this test, admin client is used to add roles to alt user,
+        which performs API calls, to avoid 401 Unauthorized errors.
+        """
         alt_user_id = self.os_alt.credentials.user_id
 
         def _create_user_domain_role_for_alt_user():
diff --git a/tempest/api/identity/admin/v3/test_trusts.py b/tempest/api/identity/admin/v3/test_trusts.py
index 78e3cce..580e304 100644
--- a/tempest/api/identity/admin/v3/test_trusts.py
+++ b/tempest/api/identity/admin/v3/test_trusts.py
@@ -27,6 +27,7 @@
 
 
 class TrustsV3TestJSON(base.BaseIdentityV3AdminTest):
+    """Test keystone trusts"""
 
     @classmethod
     def skip_checks(cls):
@@ -195,8 +196,11 @@
 
     @decorators.idempotent_id('5a0a91a4-baef-4a14-baba-59bf4d7fcace')
     def test_trust_impersonate(self):
-        # Test case to check we can create, get and delete a trust
-        # updates are not supported for trusts
+        """Test keystone trust with impersonation enabled
+
+        To check we can create, get and delete a trust.
+        Updates are not supported for trusts
+        """
         trust = self.create_trust()
         self.validate_trust(trust)
 
@@ -207,8 +211,11 @@
 
     @decorators.idempotent_id('ed2a8779-a7ac-49dc-afd7-30f32f936ed2')
     def test_trust_noimpersonate(self):
-        # Test case to check we can create, get and delete a trust
-        # with impersonation=False
+        """Test keystone trust with impersonation disabled
+
+        To check we can create, get and delete a trust
+        with impersonation=False
+        """
         trust = self.create_trust(impersonate=False)
         self.validate_trust(trust, impersonate=False)
 
@@ -219,8 +226,11 @@
 
     @decorators.idempotent_id('0ed14b66-cefd-4b5c-a964-65759453e292')
     def test_trust_expire(self):
-        # Test case to check we can create, get and delete a trust
-        # with an expiry specified
+        """Test expire attribute of keystone trust
+
+        To check we can create, get and delete a trust
+        with an expiry specified
+        """
         expires_at = timeutils.utcnow() + datetime.timedelta(hours=1)
         # NOTE(ylobankov) In some cases the expiry time may be rounded up
         # because of microseconds. In fact, it depends on database and its
@@ -246,8 +256,10 @@
 
     @decorators.idempotent_id('3e48f95d-e660-4fa9-85e0-5a3d85594384')
     def test_trust_expire_invalid(self):
-        # Test case to check we can check an invalid expiry time
-        # is rejected with the correct error
+        """Test invalid expire attribute of a keystone trust
+
+        To check an invalid expiry time is rejected with the correct error
+        """
         # with an expiry specified
         expires_str = 'bad.123Z'
         self.assertRaises(lib_exc.BadRequest,
@@ -256,6 +268,7 @@
 
     @decorators.idempotent_id('6268b345-87ca-47c0-9ce3-37792b43403a')
     def test_get_trusts_query(self):
+        """Test getting keystone trusts"""
         self.create_trust()
         trusts_get = self.trustor_client.list_trusts(
             trustor_user_id=self.trustor_user_id)['trusts']
@@ -265,7 +278,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('4773ebd5-ecbf-4255-b8d8-b63e6f72b65d')
     def test_get_trusts_all(self):
-
+        """Test getting all keystone trusts"""
         # Simple function that can be used for cleanup
         def set_scope(auth_provider, scope):
             auth_provider.scope = scope
diff --git a/tempest/api/identity/admin/v3/test_users_negative.py b/tempest/api/identity/admin/v3/test_users_negative.py
index 11dcdb0..1cba945 100644
--- a/tempest/api/identity/admin/v3/test_users_negative.py
+++ b/tempest/api/identity/admin/v3/test_users_negative.py
@@ -23,11 +23,12 @@
 
 
 class UsersNegativeTest(base.BaseIdentityV3AdminTest):
+    """Negative tests of keystone users"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e75f006c-89cc-477b-874d-588e4eab4b17')
     def test_create_user_for_non_existent_domain(self):
-        # Attempt to create a user in a non-existent domain should fail
+        """Attempt to create a user in a non-existent domain should fail"""
         u_name = data_utils.rand_name('user')
         u_email = u_name + '@testmail.tm'
         u_password = data_utils.rand_password()
@@ -39,7 +40,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b3c9fccc-4134-46f5-b600-1da6fb0a3b1f')
     def test_authentication_for_disabled_user(self):
-        # Attempt to authenticate for disabled user should fail
+        """Attempt to authenticate for disabled user should fail"""
         password = data_utils.rand_password()
         user = self.setup_test_user(password)
         self.disable_user(user['name'], user['domain_id'])
diff --git a/tempest/api/identity/v2/test_api_discovery.py b/tempest/api/identity/v2/test_api_discovery.py
index 5b9d38c..afda104 100644
--- a/tempest/api/identity/v2/test_api_discovery.py
+++ b/tempest/api/identity/v2/test_api_discovery.py
@@ -18,11 +18,12 @@
 
 
 class TestApiDiscovery(base.BaseIdentityV2Test):
-    """Tests for API discovery features."""
+    """Tests for identity v2 API discovery features."""
 
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('ea889a68-a15f-4166-bfb1-c12456eae853')
     def test_api_version_resources(self):
+        """Test showing identity v2 api version resources"""
         descr = self.non_admin_client.show_api_description()['version']
         expected_resources = ('id', 'links', 'media-types', 'status',
                               'updated')
@@ -34,6 +35,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('007a0be0-78fe-4fdb-bbee-e9216cc17bb2')
     def test_api_media_types(self):
+        """Test showing identity v2 api version media type"""
         descr = self.non_admin_client.show_api_description()['version']
         # Get MIME type bases and descriptions
         media_types = [(media_type['base'], media_type['type']) for
@@ -49,6 +51,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('77fd6be0-8801-48e6-b9bf-38cdd2f253ec')
     def test_api_version_statuses(self):
+        """Test showing identity v2 api version status"""
         descr = self.non_admin_client.show_api_description()['version']
         status = descr['status'].lower()
         supported_statuses = ['current', 'stable', 'experimental',
diff --git a/tempest/api/identity/v2/test_extension.py b/tempest/api/identity/v2/test_extension.py
index c538c14..13555bd 100644
--- a/tempest/api/identity/v2/test_extension.py
+++ b/tempest/api/identity/v2/test_extension.py
@@ -18,10 +18,11 @@
 
 
 class ExtensionTestJSON(base.BaseIdentityV2Test):
+    """Test extensions in identity v2 API"""
 
     @decorators.idempotent_id('85f3f661-f54c-4d48-b563-72ae952b9383')
     def test_list_extensions(self):
-        # List all the extensions
+        """List all the identity extensions via v2 API"""
         body = self.non_admin_client.list_extensions()['extensions']['values']
         self.assertNotEmpty(body)
         keys = ['name', 'updated', 'alias', 'links',
diff --git a/tempest/api/identity/v2/test_tenants.py b/tempest/api/identity/v2/test_tenants.py
index b2a6d13..1752b65 100644
--- a/tempest/api/identity/v2/test_tenants.py
+++ b/tempest/api/identity/v2/test_tenants.py
@@ -19,11 +19,13 @@
 
 
 class IdentityTenantsTest(base.BaseIdentityV2Test):
+    """Test listing tenants in identity v2 API"""
 
     credentials = ['primary', 'alt']
 
     @decorators.idempotent_id('ecae2459-243d-4ba1-ad02-65f15dc82b78')
     def test_list_tenants_returns_only_authorized_tenants(self):
+        """Test listing tenants only returns authorized tenants via v2 API"""
         alt_tenant_name = self.os_alt.credentials.tenant_name
         resp = self.non_admin_tenants_client.list_tenants()
 
diff --git a/tempest/api/identity/v2/test_tokens.py b/tempest/api/identity/v2/test_tokens.py
index 64b81c2..a928ad9 100644
--- a/tempest/api/identity/v2/test_tokens.py
+++ b/tempest/api/identity/v2/test_tokens.py
@@ -20,10 +20,11 @@
 
 
 class TokensTest(base.BaseIdentityV2Test):
+    """Test tokens in identity v2 API"""
 
     @decorators.idempotent_id('65ae3b78-91ff-467b-a705-f6678863b8ec')
     def test_create_token(self):
-
+        """Test creating token for user via v2 API"""
         token_client = self.non_admin_token_client
 
         # get a token for the user
diff --git a/tempest/api/identity/v2/test_users.py b/tempest/api/identity/v2/test_users.py
index 2eea860..a63b45c 100644
--- a/tempest/api/identity/v2/test_users.py
+++ b/tempest/api/identity/v2/test_users.py
@@ -28,6 +28,7 @@
 
 
 class IdentityUsersTest(base.BaseIdentityV2Test):
+    """Test user password in identity v2 API"""
 
     @classmethod
     def resource_setup(cls):
@@ -85,6 +86,7 @@
                       'immutable user source and solely '
                       'provides read-only access to users.')
     def test_user_update_own_password(self):
+        """test updating user's own password via v2 API"""
         old_pass = self.creds.password
         old_token = self.non_admin_users_client.token
         new_pass = data_utils.rand_password()
diff --git a/tempest/api/identity/v3/test_api_discovery.py b/tempest/api/identity/v3/test_api_discovery.py
index e87d1cd..ebb96fd 100644
--- a/tempest/api/identity/v3/test_api_discovery.py
+++ b/tempest/api/identity/v3/test_api_discovery.py
@@ -22,10 +22,11 @@
 
 
 class TestApiDiscovery(base.BaseIdentityV3Test):
-    """Tests for API discovery features."""
+    """Tests for identity API discovery features."""
 
     @decorators.idempotent_id('79aec9ae-710f-4c54-a4fc-3aa25b4feac3')
     def test_identity_v3_existence(self):
+        """Test that identity v3 version should exist"""
         versions = self.non_admin_versions_client.list_versions()
         found = any(
             "v3" in version.get('id')
@@ -35,9 +36,12 @@
     @decorators.idempotent_id('721f480f-35b6-46c7-846e-047e6acea0dc')
     @decorators.attr(type='smoke')
     def test_list_api_versions(self):
-        # NOTE: Actually this API doesn't depend on v3 API at all, because
-        # the API operation is "GET /" without v3's endpoint. The reason of
-        # this test path is just v3 API is CURRENT on Keystone side.
+        """Test listing identity api versions
+
+        NOTE: Actually this API doesn't depend on v3 API at all, because
+        the API operation is "GET /" without v3's endpoint. The reason of
+        this test path is just v3 API is CURRENT on Keystone side.
+        """
         versions = self.non_admin_versions_client.list_versions()
         expected_resources = ('id', 'links', 'media-types', 'status',
                               'updated')
@@ -49,6 +53,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('b9232f5e-d9e5-4d97-b96c-28d3db4de1bd')
     def test_api_version_resources(self):
+        """Test showing identity v3 api version resources"""
         descr = self.non_admin_client.show_api_description()['version']
         expected_resources = ('id', 'links', 'media-types', 'status',
                               'updated')
@@ -60,6 +65,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('657c1970-4722-4189-8831-7325f3bc4265')
     def test_api_media_types(self):
+        """Test showing identity v3 api version media type"""
         descr = self.non_admin_client.show_api_description()['version']
         # Get MIME type bases and descriptions
         media_types = [(media_type['base'], media_type['type']) for
@@ -75,6 +81,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('8879a470-abfb-47bb-bb8d-5a7fd279ad1e')
     def test_api_version_statuses(self):
+        """Test showing identity v3 api version status"""
         descr = self.non_admin_client.show_api_description()['version']
         status = descr['status'].lower()
         supported_statuses = ['current', 'stable', 'experimental',
diff --git a/tempest/api/identity/v3/test_application_credentials.py b/tempest/api/identity/v3/test_application_credentials.py
index 1cee902..ef1bbdf 100644
--- a/tempest/api/identity/v3/test_application_credentials.py
+++ b/tempest/api/identity/v3/test_application_credentials.py
@@ -23,6 +23,7 @@
 
 
 class ApplicationCredentialsV3Test(base.BaseApplicationCredentialsV3Test):
+    """Test application credentials"""
 
     def _list_app_creds(self, name=None):
         kwargs = dict(user_id=self.user_id)
@@ -33,6 +34,7 @@
 
     @decorators.idempotent_id('8080c75c-eddc-4786-941a-c2da7039ae61')
     def test_create_application_credential(self):
+        """Test creating application credential"""
         app_cred = self.create_application_credential()
 
         # Check that the secret appears in the create response
@@ -55,6 +57,7 @@
 
     @decorators.idempotent_id('852daf0c-42b5-4239-8466-d193d0543ed3')
     def test_create_application_credential_expires(self):
+        """Test creating application credential with expire time"""
         expires_at = timeutils.utcnow() + datetime.timedelta(hours=1)
 
         app_cred = self.create_application_credential(expires_at=expires_at)
@@ -64,6 +67,7 @@
 
     @decorators.idempotent_id('ff0cd457-6224-46e7-b79e-0ada4964a8a6')
     def test_list_application_credentials(self):
+        """Test listing application credentials"""
         self.create_application_credential()
         self.create_application_credential()
 
@@ -72,6 +76,7 @@
 
     @decorators.idempotent_id('9bb5e5cc-5250-493a-8869-8b665f6aa5f6')
     def test_query_application_credentials(self):
+        """Test listing application credentials filtered by name"""
         self.create_application_credential()
         app_cred_two = self.create_application_credential()
         app_cred_two_name = app_cred_two['name']
diff --git a/tempest/api/identity/v3/test_domains.py b/tempest/api/identity/v3/test_domains.py
index 9f132dd..bb62ea6 100644
--- a/tempest/api/identity/v3/test_domains.py
+++ b/tempest/api/identity/v3/test_domains.py
@@ -21,6 +21,7 @@
 
 
 class DefaultDomainTestJSON(base.BaseIdentityV3Test):
+    """Test identity default domains"""
 
     @classmethod
     def setup_clients(cls):
@@ -35,5 +36,6 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('17a5de24-e6a0-4e4a-a9ee-d85b6e5612b5')
     def test_default_domain_exists(self):
+        """Test showing default domain"""
         domain = self.domains_client.show_domain(self.domain_id)['domain']
         self.assertTrue(domain['enabled'])
diff --git a/tempest/api/identity/v3/test_projects.py b/tempest/api/identity/v3/test_projects.py
index bbb4013..338b57b 100644
--- a/tempest/api/identity/v3/test_projects.py
+++ b/tempest/api/identity/v3/test_projects.py
@@ -19,11 +19,13 @@
 
 
 class IdentityV3ProjectsTest(base.BaseIdentityV3Test):
+    """Test identity projects"""
 
     credentials = ['primary', 'alt']
 
     @decorators.idempotent_id('86128d46-e170-4644-866a-cc487f699e1d')
     def test_list_projects_returns_only_authorized_projects(self):
+        """Test listing projects only returns authorized projects"""
         alt_project_name = self.os_alt.credentials.project_name
         resp = self.non_admin_users_client.list_user_projects(
             self.os_primary.credentials.user_id)
diff --git a/tempest/api/identity/v3/test_tokens.py b/tempest/api/identity/v3/test_tokens.py
index cb05f39..b201285 100644
--- a/tempest/api/identity/v3/test_tokens.py
+++ b/tempest/api/identity/v3/test_tokens.py
@@ -24,9 +24,11 @@
 
 
 class TokensV3Test(base.BaseIdentityV3Test):
+    """Test identity tokens"""
 
     @decorators.idempotent_id('a9512ac3-3909-48a4-b395-11f438e16260')
     def test_validate_token(self):
+        """Test validating token for user"""
         creds = self.os_primary.credentials
         user_id = creds.user_id
         username = creds.username
@@ -69,7 +71,7 @@
 
     @decorators.idempotent_id('6f8e4436-fc96-4282-8122-e41df57197a9')
     def test_create_token(self):
-
+        """Test creating token for user"""
         creds = self.os_primary.credentials
         user_id = creds.user_id
         username = creds.username
@@ -120,9 +122,12 @@
 
     @decorators.idempotent_id('0f9f5a5f-d5cd-4a86-8a5b-c5ded151f212')
     def test_token_auth_creation_existence_deletion(self):
-        # Tests basic token auth functionality in a way that is compatible with
-        # pre-provisioned credentials. The default user is used for token
-        # authentication.
+        """Test auth/check existence/delete token for user
+
+        Tests basic token auth functionality in a way that is compatible with
+        pre-provisioned credentials. The default user is used for token
+        authentication.
+        """
 
         # Valid user's token is authenticated
         user = self.os_primary.credentials
diff --git a/tempest/api/identity/v3/test_users.py b/tempest/api/identity/v3/test_users.py
index d4e7612..6425ea9 100644
--- a/tempest/api/identity/v3/test_users.py
+++ b/tempest/api/identity/v3/test_users.py
@@ -28,6 +28,7 @@
 
 
 class IdentityV3UsersTest(base.BaseIdentityV3Test):
+    """Test identity user password"""
 
     @classmethod
     def resource_setup(cls):
@@ -82,6 +83,7 @@
                       'immutable user source and solely '
                       'provides read-only access to users.')
     def test_user_update_own_password(self):
+        """Test updating user's own password"""
         old_pass = self.creds.password
         old_token = self.non_admin_client.token
         new_pass = data_utils.rand_password()
@@ -111,6 +113,7 @@
                       'immutable user source and solely '
                       'provides read-only access to users.')
     def test_password_history_check_self_service_api(self):
+        """Test checking password changing history"""
         old_pass = self.creds.password
         new_pass1 = data_utils.rand_password()
         new_pass2 = data_utils.rand_password()
@@ -141,6 +144,7 @@
                           'Security compliance not available.')
     @decorators.idempotent_id('a7ad8bbf-2cff-4520-8c1d-96332e151658')
     def test_user_account_lockout(self):
+        """Test locking out user account after failure attempts"""
         if (CONF.identity.user_lockout_failure_attempts <= 0 or
                 CONF.identity.user_lockout_duration <= 0):
             raise self.skipException(
diff --git a/tempest/api/image/v2/test_images.py b/tempest/api/image/v2/test_images.py
index c4a3e0e..c1a7211 100644
--- a/tempest/api/image/v2/test_images.py
+++ b/tempest/api/image/v2/test_images.py
@@ -29,6 +29,90 @@
 LOG = logging.getLogger(__name__)
 
 
+class ImportImagesTest(base.BaseV2ImageTest):
+    """Here we test the import operations for image"""
+
+    @classmethod
+    def skip_checks(cls):
+        super(ImportImagesTest, cls).skip_checks()
+        if not CONF.image_feature_enabled.import_image:
+            skip_msg = (
+                "%s skipped as image import is not available" % cls.__name__)
+            raise cls.skipException(skip_msg)
+
+    @classmethod
+    def resource_setup(cls):
+        super(ImportImagesTest, cls).resource_setup()
+        cls.available_import_methods = cls.client.info_import()[
+            'import-methods']['value']
+        if not cls.available_import_methods:
+            raise cls.skipException('Server does not support '
+                                    'any import method')
+
+    def _create_image(self):
+        # Create image
+        uuid = '00000000-1111-2222-3333-444455556666'
+        image_name = data_utils.rand_name('image')
+        container_format = CONF.image.container_formats[0]
+        disk_format = CONF.image.disk_formats[0]
+        image = self.create_image(name=image_name,
+                                  container_format=container_format,
+                                  disk_format=disk_format,
+                                  visibility='private',
+                                  ramdisk_id=uuid)
+        self.assertIn('name', image)
+        self.assertEqual(image_name, image['name'])
+        self.assertIn('visibility', image)
+        self.assertEqual('private', image['visibility'])
+        self.assertIn('status', image)
+        self.assertEqual('queued', image['status'])
+        return image
+
+    @decorators.idempotent_id('32ca0c20-e16f-44ac-8590-07869c9b4cc2')
+    def test_image_glance_direct_import(self):
+        """Test 'glance-direct' import functionalities
+
+        Create image, stage image data, import image and verify
+        that import succeeded.
+        """
+        if 'glance-direct' not in self.available_import_methods:
+            raise self.skipException('Server does not support '
+                                     'glance-direct import method')
+        image = self._create_image()
+        # Stage image data
+        file_content = data_utils.random_bytes()
+        image_file = six.BytesIO(file_content)
+        self.client.stage_image_file(image['id'], image_file)
+        # Check image status is 'uploading'
+        body = self.client.show_image(image['id'])
+        self.assertEqual(image['id'], body['id'])
+        self.assertEqual('uploading', body['status'])
+        # import image from staging to backend
+        self.client.image_import(image['id'], method='glance-direct')
+        self.client.wait_for_resource_activation(image['id'])
+
+    @decorators.idempotent_id('f6feb7a4-b04f-4706-a011-206129f83e62')
+    def test_image_web_download_import(self):
+        """Test 'web-download' import functionalities
+
+        Create image, import image and verify that import
+        succeeded.
+        """
+        if 'web-download' not in self.available_import_methods:
+            raise self.skipException('Server does not support '
+                                     'web-download import method')
+        image = self._create_image()
+        # Now try to get image details
+        body = self.client.show_image(image['id'])
+        self.assertEqual(image['id'], body['id'])
+        self.assertEqual('queued', body['status'])
+        # import image from web to backend
+        image_uri = CONF.image.http_image
+        self.client.image_import(image['id'], method='web-download',
+                                 image_uri=image_uri)
+        self.client.wait_for_resource_activation(image['id'])
+
+
 class BasicOperationsImagesTest(base.BaseV2ImageTest):
     """Here we test the basic operations of images"""
 
diff --git a/tempest/api/network/admin/test_dhcp_agent_scheduler.py b/tempest/api/network/admin/test_dhcp_agent_scheduler.py
index 4631ea9..2506185 100644
--- a/tempest/api/network/admin/test_dhcp_agent_scheduler.py
+++ b/tempest/api/network/admin/test_dhcp_agent_scheduler.py
@@ -18,6 +18,7 @@
 
 
 class DHCPAgentSchedulersTestJSON(base.BaseAdminNetworkTest):
+    """Test network DHCP agent scheduler extension"""
 
     @classmethod
     def skip_checks(cls):
@@ -37,11 +38,13 @@
 
     @decorators.idempotent_id('5032b1fe-eb42-4a64-8f3b-6e189d8b5c7d')
     def test_list_dhcp_agent_hosting_network(self):
+        """Test Listing DHCP agents hosting a network"""
         self.admin_networks_client.list_dhcp_agents_on_hosting_network(
             self.network['id'])
 
     @decorators.idempotent_id('30c48f98-e45d-4ffb-841c-b8aad57c7587')
     def test_list_networks_hosted_by_one_dhcp(self):
+        """Test Listing networks hosted by a DHCP agent"""
         body = self.admin_networks_client.list_dhcp_agents_on_hosting_network(
             self.network['id'])
         agents = body['agents']
@@ -61,6 +64,7 @@
 
     @decorators.idempotent_id('a0856713-6549-470c-a656-e97c8df9a14d')
     def test_add_remove_network_from_dhcp_agent(self):
+        """Test adding and removing network from a DHCP agent"""
         # The agent is now bound to the network, we can free the port
         self.ports_client.delete_port(self.port['id'])
         agent = dict()
diff --git a/tempest/api/network/admin/test_external_network_extension.py b/tempest/api/network/admin/test_external_network_extension.py
index 5bd3fce..0cec316 100644
--- a/tempest/api/network/admin/test_external_network_extension.py
+++ b/tempest/api/network/admin/test_external_network_extension.py
@@ -23,6 +23,7 @@
 
 
 class ExternalNetworksTestJSON(base.BaseAdminNetworkTest):
+    """Test external networks"""
 
     @classmethod
     def resource_setup(cls):
@@ -42,8 +43,11 @@
 
     @decorators.idempotent_id('462be770-b310-4df9-9c42-773217e4c8b1')
     def test_create_external_network(self):
-        # Create a network as an admin user specifying the
-        # external network extension attribute
+        """Test creating external network
+
+        Create a network as an admin user specifying the
+        external network extension attribute
+        """
         ext_network = self._create_network()
         # Verifies router:external parameter
         self.assertIsNotNone(ext_network['id'])
@@ -51,8 +55,11 @@
 
     @decorators.idempotent_id('4db5417a-e11c-474d-a361-af00ebef57c5')
     def test_update_external_network(self):
-        # Update a network as an admin user specifying the
-        # external network extension attribute
+        """Test updating external network
+
+        Update a network as an admin user specifying the
+        external network extension attribute
+        """
         network = self._create_network(external=False)
         self.assertFalse(network.get('router:external', False))
         update_body = {'router:external': True}
@@ -64,6 +71,7 @@
 
     @decorators.idempotent_id('39be4c9b-a57e-4ff9-b7c7-b218e209dfcc')
     def test_list_external_networks(self):
+        """Test listing external networks"""
         # Create external_net
         external_network = self._create_network()
         # List networks as a normal user and confirm the external
@@ -81,6 +89,7 @@
 
     @decorators.idempotent_id('2ac50ab2-7ebd-4e27-b3ce-a9e399faaea2')
     def test_show_external_networks_attribute(self):
+        """Test showing external network attribute"""
         # Create external_net
         external_network = self._create_network()
         # Show an external network as a normal user and confirm the
@@ -101,9 +110,11 @@
     @testtools.skipUnless(CONF.network_feature_enabled.floating_ips,
                           'Floating ips are not availabled')
     def test_delete_external_networks_with_floating_ip(self):
-        # Verifies external network can be deleted while still holding
-        # (unassociated) floating IPs
+        """Test deleting external network with unassociated floating ips
 
+        Verifies external network can be deleted while still holding
+        (unassociated) floating IPs
+        """
         body = self.admin_networks_client.create_network(
             **{'router:external': True})
         external_network = body['network']
diff --git a/tempest/api/network/admin/test_external_networks_negative.py b/tempest/api/network/admin/test_external_networks_negative.py
index da32f2d..92731f6 100644
--- a/tempest/api/network/admin/test_external_networks_negative.py
+++ b/tempest/api/network/admin/test_external_networks_negative.py
@@ -25,16 +25,19 @@
 
 
 class ExternalNetworksAdminNegativeTestJSON(base.BaseAdminNetworkTest):
+    """Negative tests of external network"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d402ae6c-0be0-4d8e-833b-a738895d98d0')
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_create_port_with_precreated_floatingip_as_fixed_ip(self):
-        # NOTE: External networks can be used to create both floating-ip as
-        # well as instance-ip. So, creating an instance-ip with a value of a
-        # pre-created floating-ip should be denied.
+        """Test creating port with precreated floating ip as fixed ip
 
+        NOTE: External networks can be used to create both floating-ip as
+        well as instance-ip. So, creating an instance-ip with a value of a
+        pre-created floating-ip should be denied.
+        """
         # create a floating ip
         body = self.admin_floating_ips_client.create_floatingip(
             floating_network_id=CONF.network.public_network_id)
diff --git a/tempest/api/network/admin/test_floating_ips_admin_actions.py b/tempest/api/network/admin/test_floating_ips_admin_actions.py
index adc4dda..a8dae7c 100644
--- a/tempest/api/network/admin/test_floating_ips_admin_actions.py
+++ b/tempest/api/network/admin/test_floating_ips_admin_actions.py
@@ -23,6 +23,8 @@
 
 
 class FloatingIPAdminTestJSON(base.BaseAdminNetworkTest):
+    """Test floating ips"""
+
     credentials = ['primary', 'alt', 'admin']
 
     @classmethod
@@ -55,6 +57,13 @@
 
     @decorators.idempotent_id('64f2100b-5471-4ded-b46c-ddeeeb4f231b')
     def test_list_floating_ips_from_admin_and_nonadmin(self):
+        """Test listing floating ips from admin and non admin users
+
+        This test performs below operations:
+        1. Create couple floating ips for admin and non-admin users.
+        2. Verify if admin can access all floating ips including other user
+        and non-admin user can only access its own floating ips.
+        """
         # Create floating ip from admin user
         floating_ip_admin = self.admin_floating_ips_client.create_floatingip(
             floating_network_id=self.ext_net_id)
@@ -90,10 +99,11 @@
 
     @decorators.idempotent_id('32727cc3-abe2-4485-a16e-48f2d54c14f2')
     def test_create_list_show_floating_ip_with_tenant_id_by_admin(self):
+        """Verify if admin can create/list/show floating ip with tenant id"""
         # Creates a floating IP
         body = self.admin_floating_ips_client.create_floatingip(
             floating_network_id=self.ext_net_id,
-            tenant_id=self.network['tenant_id'],
+            project_id=self.network['project_id'],
             port_id=self.port['id'])
         created_floating_ip = body['floatingip']
         self.addCleanup(
@@ -101,7 +111,7 @@
             self.floating_ips_client.delete_floatingip,
             created_floating_ip['id'])
         self.assertIsNotNone(created_floating_ip['id'])
-        self.assertIsNotNone(created_floating_ip['tenant_id'])
+        self.assertIsNotNone(created_floating_ip['project_id'])
         self.assertIsNotNone(created_floating_ip['floating_ip_address'])
         self.assertEqual(created_floating_ip['port_id'], self.port['id'])
         self.assertEqual(created_floating_ip['floating_network_id'],
@@ -116,8 +126,8 @@
         self.assertEqual(shown_floating_ip['id'], created_floating_ip['id'])
         self.assertEqual(shown_floating_ip['floating_network_id'],
                          self.ext_net_id)
-        self.assertEqual(shown_floating_ip['tenant_id'],
-                         self.network['tenant_id'])
+        self.assertEqual(shown_floating_ip['project_id'],
+                         self.network['project_id'])
         self.assertEqual(shown_floating_ip['floating_ip_address'],
                          created_floating_ip['floating_ip_address'])
         self.assertEqual(shown_floating_ip['port_id'], self.port['id'])
diff --git a/tempest/api/network/admin/test_metering_extensions.py b/tempest/api/network/admin/test_metering_extensions.py
index 5063fef..a60cd48 100644
--- a/tempest/api/network/admin/test_metering_extensions.py
+++ b/tempest/api/network/admin/test_metering_extensions.py
@@ -92,13 +92,14 @@
 
     @decorators.idempotent_id('e2fb2f8c-45bf-429a-9f17-171c70444612')
     def test_list_metering_labels(self):
-        # Verify label filtering
+        """Verify listing metering labels"""
         body = self.admin_metering_labels_client.list_metering_labels(id=33)
         metering_labels = body['metering_labels']
         self.assertEmpty(metering_labels)
 
     @decorators.idempotent_id('ec8e15ff-95d0-433b-b8a6-b466bddb1e50')
     def test_create_delete_metering_label_with_filters(self):
+        """Verifies creating and deleting metering label with filters"""
         # Creates a label
         name = data_utils.rand_name('metering-label-')
         description = "label created by tempest"
@@ -115,19 +116,20 @@
 
     @decorators.idempotent_id('30abb445-0eea-472e-bd02-8649f54a5968')
     def test_show_metering_label(self):
-        # Verifies the details of a label
+        """Verifies the details of a metering label"""
         body = self.admin_metering_labels_client.show_metering_label(
             self.metering_label['id'])
         metering_label = body['metering_label']
         self.assertEqual(self.metering_label['id'], metering_label['id'])
         self.assertEqual(self.metering_label['tenant_id'],
-                         metering_label['tenant_id'])
+                         metering_label['project_id'])
         self.assertEqual(self.metering_label['name'], metering_label['name'])
         self.assertEqual(self.metering_label['description'],
                          metering_label['description'])
 
     @decorators.idempotent_id('cc832399-6681-493b-9d79-0202831a1281')
     def test_list_metering_label_rules(self):
+        """Verifies listing metering label rules"""
         client = self.admin_metering_label_rules_client
         # Verify rule filtering
         body = client.list_metering_label_rules(id=33)
@@ -136,6 +138,7 @@
 
     @decorators.idempotent_id('f4d547cd-3aee-408f-bf36-454f8825e045')
     def test_create_delete_metering_label_rule_with_filters(self):
+        """Verifies creating and deleting metering label rule with filters"""
         # Creates a rule
         remote_ip_prefix = ("10.0.1.0/24" if self._ip_version == 4
                             else "fd03::/64")
@@ -154,7 +157,7 @@
 
     @decorators.idempotent_id('b7354489-96ea-41f3-9452-bace120fb4a7')
     def test_show_metering_label_rule(self):
-        # Verifies the details of a rule
+        """Verifies the metering details of a rule"""
         client = self.admin_metering_label_rules_client
         body = (client.show_metering_label_rule(
                 self.metering_label_rule['id']))
diff --git a/tempest/api/network/admin/test_negative_quotas.py b/tempest/api/network/admin/test_negative_quotas.py
index 0db038d..190d9e3 100644
--- a/tempest/api/network/admin/test_negative_quotas.py
+++ b/tempest/api/network/admin/test_negative_quotas.py
@@ -53,17 +53,18 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('644f4e1b-1bf9-4af0-9fd8-eb56ac0f51cf')
     def test_network_quota_exceeding(self):
+        """Test creating network when exceeding network quota will fail"""
         # Set the network quota to two
         self.admin_quotas_client.update_quotas(self.project['id'], network=2)
 
         # Create two networks
         n1 = self.admin_networks_client.create_network(
-            tenant_id=self.project['id'])
+            project_id=self.project['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.admin_networks_client.delete_network,
                         n1['network']['id'])
         n2 = self.admin_networks_client.create_network(
-            tenant_id=self.project['id'])
+            project_id=self.project['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.admin_networks_client.delete_network,
                         n2['network']['id'])
@@ -73,7 +74,7 @@
                 lib_exc.Conflict,
                 r"Quota exceeded for resources: \['network'\].*"):
             n3 = self.admin_networks_client.create_network(
-                tenant_id=self.project['id'])
+                project_id=self.project['id'])
             self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                             self.admin_networks_client.delete_network,
                             n3['network']['id'])
diff --git a/tempest/api/network/admin/test_ports.py b/tempest/api/network/admin/test_ports.py
index 289e577..5f9f29f 100644
--- a/tempest/api/network/admin/test_ports.py
+++ b/tempest/api/network/admin/test_ports.py
@@ -24,6 +24,7 @@
 
 
 class PortsAdminExtendedAttrsTestJSON(base.BaseAdminNetworkTest):
+    """Test extended attributes of ports"""
 
     @classmethod
     def setup_clients(cls):
@@ -41,11 +42,14 @@
     @decorators.idempotent_id('8e8569c1-9ac7-44db-8bc1-f5fb2814f29b')
     @utils.services('compute')
     def test_create_port_binding_ext_attr(self):
+        """Test creating port with extended attribute"""
         post_body = {"network_id": self.network['id'],
                      "binding:host_id": self.host_id,
                      "name": data_utils.rand_name(self.__class__.__name__)}
         body = self.admin_ports_client.create_port(**post_body)
         port = body['port']
+        self.addCleanup(self.admin_ports_client.wait_for_resource_deletion,
+                        port['id'])
         self.addCleanup(
             test_utils.call_and_ignore_notfound_exc,
             self.admin_ports_client.delete_port, port['id'])
@@ -56,10 +60,13 @@
     @decorators.idempotent_id('6f6c412c-711f-444d-8502-0ac30fbf5dd5')
     @utils.services('compute')
     def test_update_port_binding_ext_attr(self):
+        """Test updating port's extended attribute"""
         post_body = {"network_id": self.network['id'],
                      "name": data_utils.rand_name(self.__class__.__name__)}
         body = self.admin_ports_client.create_port(**post_body)
         port = body['port']
+        self.addCleanup(self.admin_ports_client.wait_for_resource_deletion,
+                        port['id'])
         self.addCleanup(
             test_utils.call_and_ignore_notfound_exc,
             self.admin_ports_client.delete_port, port['id'])
@@ -73,11 +80,14 @@
     @decorators.idempotent_id('1c82a44a-6c6e-48ff-89e1-abe7eaf8f9f8')
     @utils.services('compute')
     def test_list_ports_binding_ext_attr(self):
+        """Test updating and listing port's extended attribute"""
         # Create a new port
         post_body = {"network_id": self.network['id'],
                      "name": data_utils.rand_name(self.__class__.__name__)}
         body = self.admin_ports_client.create_port(**post_body)
         port = body['port']
+        self.addCleanup(self.admin_ports_client.wait_for_resource_deletion,
+                        port['id'])
         self.addCleanup(
             test_utils.call_and_ignore_notfound_exc,
             self.admin_ports_client.delete_port, port['id'])
@@ -101,10 +111,13 @@
 
     @decorators.idempotent_id('b54ac0ff-35fc-4c79-9ca3-c7dbd4ea4f13')
     def test_show_port_binding_ext_attr(self):
+        """Test showing port's extended attribute"""
         body = self.admin_ports_client.create_port(
             name=data_utils.rand_name(self.__class__.__name__),
             network_id=self.network['id'])
         port = body['port']
+        self.addCleanup(self.admin_ports_client.wait_for_resource_deletion,
+                        port['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.admin_ports_client.delete_port, port['id'])
         body = self.admin_ports_client.show_port(port['id'])
diff --git a/tempest/api/network/admin/test_quotas.py b/tempest/api/network/admin/test_quotas.py
index ef5ebb6..d8db298 100644
--- a/tempest/api/network/admin/test_quotas.py
+++ b/tempest/api/network/admin/test_quotas.py
@@ -67,7 +67,7 @@
         non_default_quotas = self.admin_quotas_client.list_quotas()
         found = False
         for qs in non_default_quotas['quotas']:
-            if qs['tenant_id'] == project_id:
+            if qs['project_id'] == project_id:
                 found = True
         self.assertTrue(found)
 
@@ -81,7 +81,7 @@
         self.admin_quotas_client.reset_quotas(project_id)
         non_default_quotas = self.admin_quotas_client.list_quotas()
         for q in non_default_quotas['quotas']:
-            self.assertNotEqual(project_id, q['tenant_id'])
+            self.assertNotEqual(project_id, q['project_id'])
         quota_set = self.admin_quotas_client.show_quotas(project_id)['quota']
         default_quotas = self.admin_quotas_client.show_default_quotas(
             project_id)['quota']
@@ -89,6 +89,7 @@
 
     @decorators.idempotent_id('2390f766-836d-40ef-9aeb-e810d78207fb')
     def test_quotas(self):
+        """Test update/list/show/reset of network quotas"""
         new_quotas = {'network': 0, 'port': 0}
         self._check_quotas(new_quotas)
 
@@ -96,6 +97,7 @@
         'quota_details', 'network'), 'Quota details extension not enabled.')
     @decorators.idempotent_id('7b05ec5f-bf44-43cb-b28f-ddd72a824288')
     def test_show_quota_details(self):
+        """Test showing network quota details"""
         # Show quota details for an existing project
         quota_details = self.admin_quotas_client.show_quota_details(
             self.admin_quotas_client.tenant_id)['quota']
diff --git a/tempest/api/network/admin/test_routers.py b/tempest/api/network/admin/test_routers.py
index 41f97d8..90e0917 100644
--- a/tempest/api/network/admin/test_routers.py
+++ b/tempest/api/network/admin/test_routers.py
@@ -27,6 +27,8 @@
 
 
 class RoutersAdminTest(base.BaseAdminNetworkTest):
+    """Test routers operation supported by admin"""
+
     # NOTE(salv-orlando): This class inherits from BaseAdminNetworkTest
     # as some router operations, such as enabling or disabling SNAT
     # require admin credentials by default
@@ -52,7 +54,7 @@
 
     @decorators.idempotent_id('e54dd3a3-4352-4921-b09d-44369ae17397')
     def test_create_router_setting_project_id(self):
-        # Test creating router from admin user setting project_id.
+        """Test creating router from admin user setting project_id."""
         project = data_utils.rand_name('test_tenant_')
         description = data_utils.rand_name('desc_')
         project = identity.identity_utils(self.os_admin).create_project(
@@ -63,18 +65,18 @@
 
         name = data_utils.rand_name('router-')
         create_body = self.admin_routers_client.create_router(
-            name=name, tenant_id=project_id)
+            name=name, project_id=project_id)
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.admin_routers_client.delete_router,
                         create_body['router']['id'])
-        self.assertEqual(project_id, create_body['router']['tenant_id'])
+        self.assertEqual(project_id, create_body['router']['project_id'])
 
     @decorators.idempotent_id('847257cc-6afd-4154-b8fb-af49f5670ce8')
     @utils.requires_ext(extension='ext-gw-mode', service='network')
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_create_router_with_default_snat_value(self):
-        # Create a router with default snat rule
+        """Create a router with default snat rule"""
         router = self._create_router(
             external_network_id=CONF.network.public_network_id)
         self._verify_router_gateway(
@@ -86,6 +88,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_create_router_with_snat_explicit(self):
+        """Test creating router with specified enable_snat value"""
         name = data_utils.rand_name('snat-router')
         # Create a router enabling snat attributes
         enable_snat_states = [False, True]
@@ -134,6 +137,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_update_router_set_gateway(self):
+        """Test updating router's gateway info"""
         router = self._create_router()
         self.routers_client.update_router(
             router['id'],
@@ -150,6 +154,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_update_router_set_gateway_with_snat_explicit(self):
+        """Test setting router's gateway with snat enabled"""
         router = self._create_router()
         self.admin_routers_client.update_router(
             router['id'],
@@ -167,6 +172,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_update_router_set_gateway_without_snat(self):
+        """Test setting router's gateway with snat not enabled"""
         router = self._create_router()
         self.admin_routers_client.update_router(
             router['id'],
@@ -183,6 +189,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_update_router_unset_gateway(self):
+        """Test unsetting router's gateway"""
         router = self._create_router(
             external_network_id=CONF.network.public_network_id)
         self.routers_client.update_router(router['id'],
@@ -199,6 +206,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_update_router_reset_gateway_without_snat(self):
+        """Test updating router's gateway to be with snat not enabled"""
         router = self._create_router(
             external_network_id=CONF.network.public_network_id)
         self.admin_routers_client.update_router(
@@ -215,6 +223,7 @@
     @decorators.idempotent_id('cbe42f84-04c2-11e7-8adb-fa163e4fa634')
     @utils.requires_ext(extension='ext-gw-mode', service='network')
     def test_create_router_set_gateway_with_fixed_ip(self):
+        """Test creating router setting gateway with fixed ip"""
         # At first create an external network and then use that
         # to create address and delete
         network_name = data_utils.rand_name(self.__class__.__name__)
diff --git a/tempest/api/network/admin/test_routers_dvr.py b/tempest/api/network/admin/test_routers_dvr.py
index 270f802..291581c 100644
--- a/tempest/api/network/admin/test_routers_dvr.py
+++ b/tempest/api/network/admin/test_routers_dvr.py
@@ -106,14 +106,14 @@
         attribute will be set to True
         """
         name = data_utils.rand_name('router')
-        tenant_id = self.routers_client.tenant_id
+        project_id = self.routers_client.project_id
         # router needs to be in admin state down in order to be upgraded to DVR
         # l3ha routers are not upgradable to dvr, make it explicitly non ha
         router = self.admin_routers_client.create_router(name=name,
                                                          distributed=False,
                                                          admin_state_up=False,
                                                          ha=False,
-                                                         tenant_id=tenant_id)
+                                                         project_id=project_id)
         router_id = router['router']['id']
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.admin_routers_client.delete_router, router_id)
diff --git a/tempest/api/network/admin/test_routers_negative.py b/tempest/api/network/admin/test_routers_negative.py
index f605945..914c046 100644
--- a/tempest/api/network/admin/test_routers_negative.py
+++ b/tempest/api/network/admin/test_routers_negative.py
@@ -27,6 +27,7 @@
 
 
 class RoutersAdminNegativeTest(base.BaseAdminNetworkTest):
+    """Admin negative tests of routers"""
 
     @classmethod
     def skip_checks(cls):
@@ -41,6 +42,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_router_set_gateway_used_ip_returns_409(self):
+        """Test creating router with gateway set to used ip should fail"""
         # At first create a address from public_network_id
         port = self.admin_ports_client.create_port(
             name=data_utils.rand_name(self.__class__.__name__),
diff --git a/tempest/api/network/test_allowed_address_pair.py b/tempest/api/network/test_allowed_address_pair.py
index 639defb..0b9d381 100644
--- a/tempest/api/network/test_allowed_address_pair.py
+++ b/tempest/api/network/test_allowed_address_pair.py
@@ -57,7 +57,7 @@
 
     @decorators.idempotent_id('86c3529b-1231-40de-803c-00e40882f043')
     def test_create_list_port_with_address_pair(self):
-        # Create port with allowed address pair attribute
+        """Create and list port with allowed address pair attribute"""
         allowed_address_pairs = [{'ip_address': self.ip_address,
                                   'mac_address': self.mac_address}]
         body = self.ports_client.create_port(
@@ -65,6 +65,8 @@
             name=data_utils.rand_name(self.__class__.__name__),
             allowed_address_pairs=allowed_address_pairs)
         port_id = body['port']['id']
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port_id)
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, port_id)
 
@@ -82,6 +84,8 @@
             network_id=self.network['id'],
             name=data_utils.rand_name(self.__class__.__name__))
         port_id = body['port']['id']
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port_id)
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, port_id)
         if mac_address is None:
@@ -100,21 +104,23 @@
 
     @decorators.idempotent_id('9599b337-272c-47fd-b3cf-509414414ac4')
     def test_update_port_with_address_pair(self):
-        # Update port with allowed address pair
+        """Update port with allowed address pair"""
         self._update_port_with_address(self.ip_address)
 
     @decorators.idempotent_id('4d6d178f-34f6-4bff-a01c-0a2f8fe909e4')
     def test_update_port_with_cidr_address_pair(self):
-        # Update allowed address pair with cidr
+        """Update allowed address pair with cidr"""
         self._update_port_with_address(str(self.cidr))
 
     @decorators.idempotent_id('b3f20091-6cd5-472b-8487-3516137df933')
     def test_update_port_with_multiple_ip_mac_address_pair(self):
-        # Create an ip _address and mac_address through port create
+        """Update allowed address pair port with multiple ip and mac"""
         resp = self.ports_client.create_port(
             network_id=self.network['id'],
             name=data_utils.rand_name(self.__class__.__name__))
         newportid = resp['port']['id']
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        newportid)
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, newportid)
         ipaddress = resp['port']['fixed_ips'][0]['ip_address']
diff --git a/tempest/api/network/test_dhcp_ipv6.py b/tempest/api/network/test_dhcp_ipv6.py
index eb31ed3..fee6af5 100644
--- a/tempest/api/network/test_dhcp_ipv6.py
+++ b/tempest/api/network/test_dhcp_ipv6.py
@@ -104,9 +104,12 @@
 
     @decorators.idempotent_id('e5517e62-6f16-430d-a672-f80875493d4c')
     def test_dhcpv6_stateless_eui64(self):
-        # NOTE: When subnets configured with RAs SLAAC (AOM=100) and DHCP
-        # stateless (AOM=110) both for radvd and dnsmasq, port shall receive
-        # IP address calculated from its MAC.
+        """Test eui64 ip when setting slaac and statelss for subnet
+
+        NOTE: When subnets configured with RAs SLAAC (AOM=100) and DHCP
+        stateless (AOM=110) both for radvd and dnsmasq, port shall receive
+        IP address calculated from its MAC.
+        """
         for ra_mode, add_mode in (
                 ('slaac', 'slaac'),
                 ('dhcpv6-stateless', 'dhcpv6-stateless'),
@@ -122,9 +125,12 @@
 
     @decorators.idempotent_id('ae2f4a5d-03ff-4c42-a3b0-ce2fcb7ea832')
     def test_dhcpv6_stateless_no_ra(self):
-        # NOTE: When subnets configured with dnsmasq SLAAC and DHCP stateless
-        # and there is no radvd, port shall receive IP address calculated
-        # from its MAC and mask of subnet.
+        """Test eui64 ip when setting stateless and no radvd for subnets
+
+        NOTE: When subnets configured with dnsmasq SLAAC and DHCP stateless
+        and there is no radvd, port shall receive IP address calculated
+        from its MAC and mask of subnet.
+        """
         for ra_mode, add_mode in (
                 (None, 'slaac'),
                 (None, 'dhcpv6-stateless'),
@@ -161,8 +167,11 @@
 
     @decorators.idempotent_id('21635b6f-165a-4d42-bf49-7d195e47342f')
     def test_dhcpv6_stateless_no_ra_no_dhcp(self):
-        # NOTE: If no radvd option and no dnsmasq option is configured
-        # port shall receive IP from fixed IPs list of subnet.
+        """Test eui64 ip when setting no radvd and no dnsmasq for subnets
+
+        NOTE: If no radvd option and no dnsmasq option is configured
+        port shall receive IP from fixed IPs list of subnet.
+        """
         real_ip, eui_ip = self._get_ips_from_subnet()
         self._clean_network()
         self.assertNotEqual(eui_ip, real_ip,
@@ -173,10 +182,13 @@
 
     @decorators.idempotent_id('4544adf7-bb5f-4bdc-b769-b3e77026cef2')
     def test_dhcpv6_two_subnets(self):
-        # NOTE: When one IPv6 subnet configured with dnsmasq SLAAC or DHCP
-        # stateless and other IPv6 is with DHCP stateful, port shall receive
-        # EUI-64 IP addresses from first subnet and DHCP address from second
-        # one. Order of subnet creating should be unimportant.
+        """Test eui64 ip when creating port under network with two subnets
+
+        NOTE: When one IPv6 subnet configured with dnsmasq SLAAC or DHCP
+        stateless and other IPv6 is with DHCP stateful, port shall receive
+        EUI-64 IP addresses from first subnet and DHCP address from second
+        one. Order of subnet creating should be unimportant.
+        """
         for order in ("slaac_first", "dhcp_first"):
             for ra_mode, add_mode in (
                     ('slaac', 'slaac'),
@@ -225,10 +237,13 @@
 
     @decorators.idempotent_id('4256c61d-c538-41ea-9147-3c450c36669e')
     def test_dhcpv6_64_subnets(self):
-        # NOTE: When one IPv6 subnet configured with dnsmasq SLAAC or DHCP
-        # stateless and other IPv4 is with DHCP of IPv4, port shall receive
-        # EUI-64 IP addresses from first subnet and IPv4 DHCP address from
-        # second one. Order of subnet creating should be unimportant.
+        """Test eui64 ip when setting slaac and stateless for subnets
+
+        NOTE: When one IPv6 subnet configured with dnsmasq SLAAC or DHCP
+        stateless and other IPv4 is with DHCP of IPv4, port shall receive
+        EUI-64 IP addresses from first subnet and IPv4 DHCP address from
+        second one. Order of subnet creating should be unimportant.
+        """
         for order in ("slaac_first", "dhcp_first"):
             for ra_mode, add_mode in (
                     ('slaac', 'slaac'),
@@ -271,8 +286,11 @@
 
     @decorators.idempotent_id('4ab211a0-276f-4552-9070-51e27f58fecf')
     def test_dhcp_stateful(self):
-        # NOTE: With all options below, DHCPv6 shall allocate address from
-        # subnet pool to port.
+        """Test creating port when setting stateful for subnets
+
+        NOTE: With all options below, DHCPv6 shall allocate address from
+        subnet pool to port.
+        """
         for ra_mode, add_mode in (
                 ('dhcpv6-stateful', 'dhcpv6-stateful'),
                 ('dhcpv6-stateful', None),
@@ -294,9 +312,12 @@
 
     @decorators.idempotent_id('51a5e97f-f02e-4e4e-9a17-a69811d300e3')
     def test_dhcp_stateful_fixedips(self):
-        # NOTE: With all options below, port shall be able to get
-        # requested IP from fixed IP range not depending on
-        # DHCP stateful (not SLAAC!) settings configured.
+        """Test creating port with fixed ip when setting stateful for subnets
+
+        NOTE: With all options below, port shall be able to get
+        requested IP from fixed IP range not depending on
+        DHCP stateful (not SLAAC!) settings configured.
+        """
         for ra_mode, add_mode in (
                 ('dhcpv6-stateful', 'dhcpv6-stateful'),
                 ('dhcpv6-stateful', None),
@@ -324,8 +345,11 @@
 
     @decorators.idempotent_id('98244d88-d990-4570-91d4-6b25d70d08af')
     def test_dhcp_stateful_fixedips_outrange(self):
-        # NOTE: When port gets IP address from fixed IP range it
-        # shall be checked if it's from subnets range.
+        """Test creating port with fixed ip that is not in the range
+
+        NOTE: When port gets IP address from fixed IP range it
+        shall be checked if it's from subnets range.
+        """
         kwargs = {'ipv6_ra_mode': 'dhcpv6-stateful',
                   'ipv6_address_mode': 'dhcpv6-stateful'}
         subnet = self.create_subnet(self.network, **kwargs)
@@ -342,8 +366,11 @@
 
     @decorators.idempotent_id('57b8302b-cba9-4fbb-8835-9168df029051')
     def test_dhcp_stateful_fixedips_duplicate(self):
-        # NOTE: When port gets IP address from fixed IP range it
-        # shall be checked if it's not duplicate.
+        """Test creating port with duplicate fixed ip
+
+        NOTE: When port gets IP address from fixed IP range it
+        shall be checked if it's not duplicate.
+        """
         kwargs = {'ipv6_ra_mode': 'dhcpv6-stateful',
                   'ipv6_address_mode': 'dhcpv6-stateful'}
         subnet = self.create_subnet(self.network, **kwargs)
@@ -376,8 +403,11 @@
 
     @decorators.idempotent_id('e98f65db-68f4-4330-9fea-abd8c5192d4d')
     def test_dhcp_stateful_router(self):
-        # NOTE: With all options below the router interface shall
-        # receive DHCPv6 IP address from allocation pool.
+        """Test creating router with dhcp stateful
+
+        NOTE: With all options below the router interface shall
+        receive DHCPv6 IP address from allocation pool.
+        """
         for ra_mode, add_mode in (
                 ('dhcpv6-stateful', 'dhcpv6-stateful'),
                 ('dhcpv6-stateful', None),
diff --git a/tempest/api/network/test_extensions.py b/tempest/api/network/test_extensions.py
index 4804ada..e116d7c 100644
--- a/tempest/api/network/test_extensions.py
+++ b/tempest/api/network/test_extensions.py
@@ -32,7 +32,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('ef28c7e6-e646-4979-9d67-deb207bc5564')
     def test_list_show_extensions(self):
-        # List available extensions for the project
+        """List available extensions and show the detail of each extension"""
         expected_alias = ['security-group', 'l3_agent_scheduler',
                           'ext-gw-mode', 'binding', 'quotas',
                           'agent', 'dhcp_agent_scheduler', 'provider',
diff --git a/tempest/api/network/test_extra_dhcp_options.py b/tempest/api/network/test_extra_dhcp_options.py
index d363081..bc6418a 100644
--- a/tempest/api/network/test_extra_dhcp_options.py
+++ b/tempest/api/network/test_extra_dhcp_options.py
@@ -58,7 +58,7 @@
 
     @decorators.idempotent_id('d2c17063-3767-4a24-be4f-a23dbfa133c9')
     def test_create_list_port_with_extra_dhcp_options(self):
-        # Create a port with Extra DHCP Options
+        """Test creating a port with Extra DHCP Options and list those"""
         body = self.ports_client.create_port(
             network_id=self.network['id'],
             name=data_utils.rand_name(self.__class__.__name__),
@@ -76,7 +76,7 @@
 
     @decorators.idempotent_id('9a6aebf4-86ee-4f47-b07a-7f7232c55607')
     def test_update_show_port_with_extra_dhcp_options(self):
-        # Update port with extra dhcp options
+        """Test updating port with extra DHCP options and show that port"""
         name = data_utils.rand_name('new-port-name')
         self.ports_client.update_port(
             self.port['id'],
diff --git a/tempest/api/network/test_floating_ips.py b/tempest/api/network/test_floating_ips.py
index aaa5497..c32d3c1 100644
--- a/tempest/api/network/test_floating_ips.py
+++ b/tempest/api/network/test_floating_ips.py
@@ -73,6 +73,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('62595970-ab1c-4b7f-8fcc-fddfe55e8718')
     def test_create_list_show_update_delete_floating_ip(self):
+        """Test create/list/show/update/delete floating ip"""
         # Creates a floating IP
         body = self.floating_ips_client.create_floatingip(
             floating_network_id=self.ext_net_id,
@@ -83,7 +84,7 @@
             self.floating_ips_client.delete_floatingip,
             created_floating_ip['id'])
         self.assertIsNotNone(created_floating_ip['id'])
-        self.assertIsNotNone(created_floating_ip['tenant_id'])
+        self.assertIsNotNone(created_floating_ip['project_id'])
         self.assertIsNotNone(created_floating_ip['floating_ip_address'])
         self.assertEqual(created_floating_ip['port_id'], self.ports[0]['id'])
         self.assertEqual(created_floating_ip['floating_network_id'],
@@ -97,8 +98,8 @@
         self.assertEqual(shown_floating_ip['id'], created_floating_ip['id'])
         self.assertEqual(shown_floating_ip['floating_network_id'],
                          self.ext_net_id)
-        self.assertEqual(shown_floating_ip['tenant_id'],
-                         created_floating_ip['tenant_id'])
+        self.assertEqual(shown_floating_ip['project_id'],
+                         created_floating_ip['project_id'])
         self.assertEqual(shown_floating_ip['floating_ip_address'],
                          created_floating_ip['floating_ip_address'])
         self.assertEqual(shown_floating_ip['port_id'], self.ports[0]['id'])
@@ -133,6 +134,14 @@
 
     @decorators.idempotent_id('e1f6bffd-442f-4668-b30e-df13f2705e77')
     def test_floating_ip_delete_port(self):
+        """Test deleting floating ip's port
+
+        1. Create a floating ip
+        2. Create a port
+        3. Update the floating ip's port_id to the created port
+        4. Delete the port
+        5. Verify that the port details are cleared from the floating ip
+        """
         # Create a floating IP
         body = self.floating_ips_client.create_floatingip(
             floating_network_id=self.ext_net_id)
@@ -163,6 +172,7 @@
 
     @decorators.idempotent_id('1bb2f731-fe5a-4b8c-8409-799ade1bed4d')
     def test_floating_ip_update_different_router(self):
+        """Test associating a floating ip to a port on different router"""
         # Associate a floating IP to a port on a router
         body = self.floating_ips_client.create_floatingip(
             floating_network_id=self.ext_net_id,
@@ -211,6 +221,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('36de4bd0-f09c-43e3-a8e1-1decc1ffd3a5')
     def test_create_floating_ip_specifying_a_fixed_ip_address(self):
+        """Test creating floating ip with specified fixed ip"""
         body = self.floating_ips_client.create_floatingip(
             floating_network_id=self.ext_net_id,
             port_id=self.ports[1]['id'],
@@ -230,6 +241,12 @@
 
     @decorators.idempotent_id('45c4c683-ea97-41ef-9c51-5e9802f2f3d7')
     def test_create_update_floatingip_with_port_multiple_ip_address(self):
+        """Test updating floating ip's fixed_ips to another ip of same port
+
+        First we create a port with 2 fixed ips, then we create a floating ip
+        with one of the fixed ips, and then we update the floating ip to
+        another fixed ip of that port.
+        """
         # Find out ips that can be used for tests
         list_ips = net_utils.get_unused_ip_addresses(
             self.ports_client,
diff --git a/tempest/api/network/test_floating_ips_negative.py b/tempest/api/network/test_floating_ips_negative.py
index 1688c9d..80df5d6 100644
--- a/tempest/api/network/test_floating_ips_negative.py
+++ b/tempest/api/network/test_floating_ips_negative.py
@@ -58,6 +58,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('22996ea8-4a81-4b27-b6e1-fa5df92fa5e8')
     def test_create_floatingip_with_port_ext_net_unreachable(self):
+        """Creating floating ip when port's external network is unreachable"""
         self.assertRaises(
             lib_exc.NotFound, self.floating_ips_client.create_floatingip,
             floating_network_id=self.ext_net_id, port_id=self.port['id'],
@@ -67,6 +68,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('50b9aeb4-9f0b-48ee-aa31-fa955a48ff54')
     def test_create_floatingip_in_private_network(self):
+        """Test creating floating in private network"""
         self.assertRaises(lib_exc.BadRequest,
                           self.floating_ips_client.create_floatingip,
                           floating_network_id=self.network['id'],
@@ -77,6 +79,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6b3b8797-6d43-4191-985c-c48b773eb429')
     def test_associate_floatingip_port_ext_net_unreachable(self):
+        """Associate floating ip to port with unreachable external network"""
         # Create floating ip
         body = self.floating_ips_client.create_floatingip(
             floating_network_id=self.ext_net_id)
diff --git a/tempest/api/network/test_networks.py b/tempest/api/network/test_networks.py
index eba1f6c..7646b63 100644
--- a/tempest/api/network/test_networks.py
+++ b/tempest/api/network/test_networks.py
@@ -29,6 +29,7 @@
 
 
 class BaseNetworkTestResources(base.BaseNetworkTest):
+    """Test networks"""
 
     @classmethod
     def resource_setup(cls):
@@ -158,6 +159,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('0e269138-0da6-4efc-a46d-578161e7b221')
     def test_create_update_delete_network_subnet(self):
+        """Verify creating, updating and deleting network subnet"""
         # Create a network
         network = self.create_network()
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
@@ -183,7 +185,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('2bf13842-c93f-4a69-83ed-717d2ec3b44e')
     def test_show_network(self):
-        # Verify the details of a network
+        """Verify the details of a network"""
         body = self.networks_client.show_network(self.network['id'])
         network = body['network']
         for key in ['id', 'name']:
@@ -191,7 +193,7 @@
 
     @decorators.idempotent_id('867819bb-c4b6-45f7-acf9-90edcf70aa5e')
     def test_show_network_fields(self):
-        # Verify specific fields of a network
+        """Verify specific fields of a network"""
         fields = ['id', 'name']
         if utils.is_extension_enabled('net-mtu', 'network'):
             fields.append('mtu')
@@ -207,7 +209,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('f7ffdeda-e200-4a7a-bcbe-05716e86bf43')
     def test_list_networks(self):
-        # Verify the network exists in the list of all networks
+        """Verify the network exists in the list of all networks"""
         body = self.networks_client.list_networks()
         networks = [network['id'] for network in body['networks']
                     if network['id'] == self.network['id']]
@@ -215,7 +217,7 @@
 
     @decorators.idempotent_id('6ae6d24f-9194-4869-9c85-c313cb20e080')
     def test_list_networks_fields(self):
-        # Verify specific fields of the networks
+        """Verify specific fields of the networks"""
         fields = ['id', 'name']
         if utils.is_extension_enabled('net-mtu', 'network'):
             fields.append('mtu')
@@ -228,7 +230,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('bd635d81-6030-4dd1-b3b9-31ba0cfdf6cc')
     def test_show_subnet(self):
-        # Verify the details of a subnet
+        """Verify the details of a subnet"""
         body = self.subnets_client.show_subnet(self.subnet['id'])
         subnet = body['subnet']
         self.assertNotEmpty(subnet, "Subnet returned has no fields")
@@ -238,7 +240,7 @@
 
     @decorators.idempotent_id('270fff0b-8bfc-411f-a184-1e8fd35286f0')
     def test_show_subnet_fields(self):
-        # Verify specific fields of a subnet
+        """Verify specific fields of a subnet"""
         fields = ['id', 'network_id']
         body = self.subnets_client.show_subnet(self.subnet['id'],
                                                fields=fields)
@@ -250,7 +252,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('db68ba48-f4ea-49e9-81d1-e367f6d0b20a')
     def test_list_subnets(self):
-        # Verify the subnet exists in the list of all subnets
+        """Verify the subnet exists in the list of all subnets"""
         body = self.subnets_client.list_subnets()
         subnets = [subnet['id'] for subnet in body['subnets']
                    if subnet['id'] == self.subnet['id']]
@@ -258,7 +260,7 @@
 
     @decorators.idempotent_id('842589e3-9663-46b0-85e4-7f01273b0412')
     def test_list_subnets_fields(self):
-        # Verify specific fields of subnets
+        """Verify specific fields of subnets"""
         fields = ['id', 'network_id']
         body = self.subnets_client.list_subnets(fields=fields)
         subnets = body['subnets']
@@ -268,6 +270,7 @@
 
     @decorators.idempotent_id('f04f61a9-b7f3-4194-90b2-9bcf660d1bfe')
     def test_delete_network_with_subnet(self):
+        """Verify deleting network with subnet"""
         # Creates a network
         network = self.create_network()
         net_id = network['id']
@@ -287,34 +290,41 @@
 
     @decorators.idempotent_id('d2d596e2-8e76-47a9-ac51-d4648009f4d3')
     def test_create_delete_subnet_without_gateway(self):
+        """Verify creating and deleting subnet without gateway"""
         self._create_verify_delete_subnet()
 
     @decorators.idempotent_id('9393b468-186d-496d-aa36-732348cd76e7')
     def test_create_delete_subnet_with_gw(self):
+        """Verify creating and deleting subnet with gateway"""
         self._create_verify_delete_subnet(
             **self.subnet_dict(['gateway']))
 
     @decorators.idempotent_id('bec949c4-3147-4ba6-af5f-cd2306118404')
     def test_create_delete_subnet_with_allocation_pools(self):
+        """Verify creating and deleting subnet with allocation pools"""
         self._create_verify_delete_subnet(
             **self.subnet_dict(['allocation_pools']))
 
     @decorators.idempotent_id('8217a149-0c6c-4cfb-93db-0486f707d13f')
     def test_create_delete_subnet_with_gw_and_allocation_pools(self):
+        """Verify create/delete subnet with gateway and allocation pools"""
         self._create_verify_delete_subnet(**self.subnet_dict(
             ['gateway', 'allocation_pools']))
 
     @decorators.idempotent_id('d830de0a-be47-468f-8f02-1fd996118289')
     def test_create_delete_subnet_with_host_routes_and_dns_nameservers(self):
+        """Verify create/delete subnet with host routes and name servers"""
         self._create_verify_delete_subnet(
             **self.subnet_dict(['host_routes', 'dns_nameservers']))
 
     @decorators.idempotent_id('94ce038d-ff0a-4a4c-a56b-09da3ca0b55d')
     def test_create_delete_subnet_with_dhcp_enabled(self):
+        """Verify create/delete subnet with dhcp enabled"""
         self._create_verify_delete_subnet(enable_dhcp=True)
 
     @decorators.idempotent_id('3d3852eb-3009-49ec-97ac-5ce83b73010a')
     def test_update_subnet_gw_dns_host_routes_dhcp(self):
+        """Verify updating subnet's gateway/nameserver/routes/dhcp"""
         network = self.create_network()
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.networks_client.delete_network, network['id'])
@@ -349,6 +359,7 @@
 
     @decorators.idempotent_id('a4d9ec4c-0306-4111-a75c-db01a709030b')
     def test_create_delete_subnet_all_attributes(self):
+        """Verify create/delete subnet's all attributes"""
         self._create_verify_delete_subnet(
             enable_dhcp=True,
             **self.subnet_dict(['gateway', 'host_routes', 'dns_nameservers']))
@@ -359,6 +370,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_external_network_visibility(self):
+        """Verify external network's visibility"""
         public_network_id = CONF.network.public_network_id
 
         # find external network matching public_network_id
@@ -394,6 +406,7 @@
     @utils.requires_ext(extension="standard-attr-description",
                         service="network")
     def test_create_update_network_description(self):
+        """Verify creating and updating network's description"""
         body = self.create_network(description='d1')
         self.assertEqual('d1', body['description'])
         net_id = body['id']
@@ -454,6 +467,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('d4f9024d-1e28-4fc1-a6b1-25dbc6fa11e2')
     def test_bulk_create_delete_network(self):
+        """Verify creating and deleting multiple networks in one request"""
         # Creates 2 networks in one request
         network_list = [{'name': data_utils.rand_name('network-')},
                         {'name': data_utils.rand_name('network-')}]
@@ -470,6 +484,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('8936533b-c0aa-4f29-8e53-6cc873aec489')
     def test_bulk_create_delete_subnet(self):
+        """Verify creating and deleting multiple subnets in one request"""
         networks = [self.create_network(), self.create_network()]
         # Creates 2 subnets in one request
         cidrs = [subnet_cidr
@@ -499,6 +514,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('48037ff2-e889-4c3b-b86a-8e3f34d2d060')
     def test_bulk_create_delete_port(self):
+        """Verify creating and deleting multiple ports in one request"""
         networks = [self.create_network(), self.create_network()]
         # Creates 2 ports in one request
         names = [data_utils.rand_name('port-') for i in range(len(networks))]
@@ -532,6 +548,7 @@
 
     @decorators.idempotent_id('e41a4888-65a6-418c-a095-f7c2ef4ad59a')
     def test_create_delete_subnet_with_gw(self):
+        """Verify creating and deleting subnet with gateway"""
         net = netaddr.IPNetwork(CONF.network.project_network_v6_cidr)
         gateway = str(netaddr.IPAddress(net.first + 2))
         network = self.create_network()
@@ -541,6 +558,7 @@
 
     @decorators.idempotent_id('ebb4fd95-524f-46af-83c1-0305b239338f')
     def test_create_delete_subnet_with_default_gw(self):
+        """Verify creating and deleting subnet without specified gateway"""
         net = netaddr.IPNetwork(CONF.network.project_network_v6_cidr)
         gateway_ip = str(netaddr.IPAddress(net.first + 1))
         network = self.create_network()
@@ -550,6 +568,12 @@
 
     @decorators.idempotent_id('a9653883-b2a4-469b-8c3c-4518430a7e55')
     def test_create_list_subnet_with_no_gw64_one_network(self):
+        """Verify subnets with and without gateway are in one network
+
+        First we create a network, then we create one ipv6 subnet with
+        gateway and one ipv4 subnet without gateway, the two subnets
+        should be in the same network
+        """
         network = self.create_network()
         ipv6_gateway = self.subnet_dict(['gateway'])['gateway']
         subnet1 = self.create_subnet(network,
@@ -589,6 +613,7 @@
 
     @decorators.idempotent_id('da40cd1b-a833-4354-9a85-cd9b8a3b74ca')
     def test_create_delete_subnet_with_v6_attributes_stateful(self):
+        """Test create/delete subnet with ipv6 attributes stateful"""
         self._create_verify_delete_subnet(
             gateway=self._subnet_data[self._ip_version]['gateway'],
             ipv6_ra_mode='dhcpv6-stateful',
@@ -596,12 +621,14 @@
 
     @decorators.idempotent_id('176b030f-a923-4040-a755-9dc94329e60c')
     def test_create_delete_subnet_with_v6_attributes_slaac(self):
+        """Test create/delete subnet with ipv6 attributes slaac"""
         self._create_verify_delete_subnet(
             ipv6_ra_mode='slaac',
             ipv6_address_mode='slaac')
 
     @decorators.idempotent_id('7d410310-8c86-4902-adf9-865d08e31adb')
     def test_create_delete_subnet_with_v6_attributes_stateless(self):
+        """Test create/delete subnet with ipv6 attributes stateless"""
         self._create_verify_delete_subnet(
             ipv6_ra_mode='dhcpv6-stateless',
             ipv6_address_mode='dhcpv6-stateless')
diff --git a/tempest/api/network/test_networks_negative.py b/tempest/api/network/test_networks_negative.py
index 3af67dd..0525484 100644
--- a/tempest/api/network/test_networks_negative.py
+++ b/tempest/api/network/test_networks_negative.py
@@ -21,10 +21,12 @@
 
 
 class NetworksNegativeTestJSON(base.BaseNetworkTest):
+    """Negative tests of network"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9293e937-824d-42d2-8d5b-e985ea67002a')
     def test_show_non_existent_network(self):
+        """Test showing non existent network"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.networks_client.show_network,
                           non_exist_id)
@@ -32,6 +34,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d746b40c-5e09-4043-99f7-cba1be8b70df')
     def test_show_non_existent_subnet(self):
+        """Test showing non existent subnet"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.subnets_client.show_subnet,
                           non_exist_id)
@@ -39,6 +42,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a954861d-cbfd-44e8-b0a9-7fab111f235d')
     def test_show_non_existent_port(self):
+        """Test showing non existent port"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.ports_client.show_port,
                           non_exist_id)
@@ -46,6 +50,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('98bfe4e3-574e-4012-8b17-b2647063de87')
     def test_update_non_existent_network(self):
+        """Test updating non existent network"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(
             lib_exc.NotFound, self.networks_client.update_network,
@@ -54,6 +59,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('03795047-4a94-4120-a0a1-bd376e36fd4e')
     def test_delete_non_existent_network(self):
+        """Test deleting non existent network"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.networks_client.delete_network,
@@ -62,6 +68,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1cc47884-ac52-4415-a31c-e7ce5474a868')
     def test_update_non_existent_subnet(self):
+        """Test updating non existent subnet"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.subnets_client.update_subnet,
                           non_exist_id, name='new_name')
@@ -69,6 +76,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a176c859-99fb-42ec-a208-8a85b552a239')
     def test_delete_non_existent_subnet(self):
+        """Test deleting non existent subnet"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.subnets_client.delete_subnet, non_exist_id)
@@ -76,6 +84,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('13d3b106-47e6-4b9b-8d53-dae947f092fe')
     def test_create_port_on_non_existent_network(self):
+        """Test creating port on non existent network"""
         non_exist_net_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.ports_client.create_port,
@@ -85,6 +94,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('cf8eef21-4351-4f53-adcd-cc5cb1e76b92')
     def test_update_non_existent_port(self):
+        """Test updating non existent port"""
         non_exist_port_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound, self.ports_client.update_port,
                           non_exist_port_id, name='new_name')
@@ -92,6 +102,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('49ec2bbd-ac2e-46fd-8054-798e679ff894')
     def test_delete_non_existent_port(self):
+        """Test deleting non existent port"""
         non_exist_port_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.ports_client.delete_port, non_exist_port_id)
diff --git a/tempest/api/network/test_ports.py b/tempest/api/network/test_ports.py
index 10121de..479578d 100644
--- a/tempest/api/network/test_ports.py
+++ b/tempest/api/network/test_ports.py
@@ -70,12 +70,15 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('c72c1c0c-2193-4aca-aaa4-b1442640f51c')
     def test_create_update_delete_port(self):
+        """Test creating, updating and deleting port"""
         # Verify port creation
         body = self.ports_client.create_port(
             network_id=self.network['id'],
             name=data_utils.rand_name(self.__class__.__name__))
         port = body['port']
         # Schedule port deletion with verification upon test completion
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port['id'])
         self.addCleanup(self._delete_port, port['id'])
         self.assertTrue(port['admin_state_up'])
         # Verify port update
@@ -89,6 +92,7 @@
 
     @decorators.idempotent_id('67f1b811-f8db-43e2-86bd-72c074d4a42c')
     def test_create_bulk_port(self):
+        """Test creating multiple ports in a single request"""
         network1 = self.network
         network2 = self._create_network()
         network_list = [network1['id'], network2['id']]
@@ -97,6 +101,10 @@
         created_ports = body['ports']
         port1 = created_ports[0]
         port2 = created_ports[1]
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port1['id'])
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port2['id'])
         self.addCleanup(self._delete_port, port1['id'])
         self.addCleanup(self._delete_port, port2['id'])
         self.assertEqual(port1['network_id'], network1['id'])
@@ -107,6 +115,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('0435f278-40ae-48cb-a404-b8a087bc09b1')
     def test_create_port_in_allowed_allocation_pools(self):
+        """Test creating port in allowed allocation pools"""
         network = self._create_network()
         net_id = network['id']
         address = self.cidr
@@ -123,6 +132,8 @@
         body = self.ports_client.create_port(
             network_id=net_id,
             name=data_utils.rand_name(self.__class__.__name__))
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        body['port']['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, body['port']['id'])
         port = body['port']
@@ -136,7 +147,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('c9a685bd-e83f-499c-939f-9f7863ca259f')
     def test_show_port(self):
-        # Verify the details of port
+        """Verify the details of port"""
         body = self.ports_client.show_port(self.port['id'])
         port = body['port']
         self.assertIn('id', port)
@@ -152,7 +163,7 @@
 
     @decorators.idempotent_id('45fcdaf2-dab0-4c13-ac6c-fcddfb579dbd')
     def test_show_port_fields(self):
-        # Verify specific fields of a port
+        """Verify specific fields of a port"""
         fields = ['id', 'mac_address']
         body = self.ports_client.show_port(self.port['id'],
                                            fields=fields)
@@ -164,7 +175,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('cf95b358-3e92-4a29-a148-52445e1ac50e')
     def test_list_ports(self):
-        # Verify the port exists in the list of all ports
+        """Verify the port exists in the list of all ports"""
         body = self.ports_client.list_ports()
         ports = [port['id'] for port in body['ports']
                  if port['id'] == self.port['id']]
@@ -172,6 +183,7 @@
 
     @decorators.idempotent_id('e7fe260b-1e79-4dd3-86d9-bec6a7959fc5')
     def test_port_list_filter_by_ip(self):
+        """Test listing ports filtered by ip"""
         # Create network and subnet
         network = self._create_network()
         self._create_subnet(network)
@@ -179,11 +191,15 @@
         port_1 = self.ports_client.create_port(
             network_id=network['id'],
             name=data_utils.rand_name(self.__class__.__name__))
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port_1['port']['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, port_1['port']['id'])
         port_2 = self.ports_client.create_port(
             network_id=network['id'],
             name=data_utils.rand_name(self.__class__.__name__))
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port_2['port']['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, port_2['port']['id'])
         # List ports filtered by fixed_ips
@@ -192,9 +208,9 @@
         port_list = self.ports_client.list_ports(fixed_ips=fixed_ips)
         # Check that we got the desired port
         ports = port_list['ports']
-        tenant_ids = set([port['tenant_id'] for port in ports])
-        self.assertEqual(len(tenant_ids), 1,
-                         'Ports from multiple tenants are in the list resp')
+        project_ids = set([port['project_id'] for port in ports])
+        self.assertEqual(len(project_ids), 1,
+                         'Ports from multiple projects are in the list resp')
         port_ids = [port['id'] for port in ports]
         fixed_ips = [port['fixed_ips'] for port in ports]
         port_net_ids = [port['network_id'] for port in ports]
@@ -211,6 +227,7 @@
         utils.is_extension_enabled('ip-substring-filtering', 'network'),
         'ip-substring-filtering extension not enabled.')
     def test_port_list_filter_by_ip_substr(self):
+        """Test listing ports filtered by part of ip address string"""
         # Create network and subnet
         network = self._create_network()
         subnet = self._create_subnet(network)
@@ -236,6 +253,8 @@
             network_id=network['id'],
             name=data_utils.rand_name(self.__class__.__name__),
             fixed_ips=fixed_ips)
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port_1['port']['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, port_1['port']['id'])
         fixed_ips = [{'subnet_id': subnet['id'], 'ip_address': ip_address_2}]
@@ -243,6 +262,8 @@
             network_id=network['id'],
             name=data_utils.rand_name(self.__class__.__name__),
             fixed_ips=fixed_ips)
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port_2['port']['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, port_2['port']['id'])
 
@@ -289,6 +310,7 @@
 
     @decorators.idempotent_id('5ad01ed0-0e6e-4c5d-8194-232801b15c72')
     def test_port_list_filter_by_router_id(self):
+        """Test listing ports filtered by router id"""
         # Create a router
         network = self._create_network()
         self._create_subnet(network)
@@ -301,6 +323,8 @@
         # Add router interface to port created above
         self.routers_client.add_router_interface(router['id'],
                                                  port_id=port['port']['id'])
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port['port']['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.routers_client.remove_router_interface,
                         router['id'], port_id=port['port']['id'])
@@ -313,7 +337,7 @@
 
     @decorators.idempotent_id('ff7f117f-f034-4e0e-abff-ccef05c454b4')
     def test_list_ports_fields(self):
-        # Verify specific fields of ports
+        """Verify specific fields of ports"""
         fields = ['id', 'mac_address']
         body = self.ports_client.list_ports(fields=fields)
         ports = body['ports']
@@ -324,6 +348,7 @@
 
     @decorators.idempotent_id('63aeadd4-3b49-427f-a3b1-19ca81f06270')
     def test_create_update_port_with_second_ip(self):
+        """Test updating port from 2 fixed ips to 1 fixed ip and vice versa"""
         # Create a network with two subnets
         network = self._create_network()
         subnet_1 = self._create_subnet(network)
@@ -336,6 +361,8 @@
         # Create a port with multiple IP addresses
         port = self.create_port(network,
                                 fixed_ips=fixed_ips)
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, port['id'])
         self.assertEqual(2, len(port['fixed_ips']))
@@ -379,6 +406,8 @@
             "admin_state_up": True,
             "fixed_ips": fixed_ip_1}
         body = self.ports_client.create_port(**post_body)
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        body['port']['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, body['port']['id'])
         port = body['port']
@@ -410,6 +439,12 @@
         utils.is_extension_enabled('security-group', 'network'),
         'security-group extension not enabled.')
     def test_update_port_with_security_group_and_extra_attributes(self):
+        """Test updating port's security_group along with extra attributes
+
+        First we create a port with one security group, and then we update the
+        port's security_group, in the same update request we also change
+        the port's fixed ips.
+        """
         self._update_port_with_security_groups(
             [data_utils.rand_name('secgroup')])
 
@@ -418,12 +453,19 @@
         utils.is_extension_enabled('security-group', 'network'),
         'security-group extension not enabled.')
     def test_update_port_with_two_security_groups_and_extra_attributes(self):
+        """Test updating port with two security_groups and extra attributes
+
+        First we create a port with one security group, and then we update the
+        port to two security_groups, in the same update request we also change
+        the port's fixed ips.
+        """
         self._update_port_with_security_groups(
             [data_utils.rand_name('secgroup'),
              data_utils.rand_name('secgroup')])
 
     @decorators.idempotent_id('13e95171-6cbd-489c-9d7c-3f9c58215c18')
     def test_create_show_delete_port_user_defined_mac(self):
+        """Test creating port with user defined mac address"""
         # Create a port for a legal mac
         body = self.ports_client.create_port(
             network_id=self.network['id'],
@@ -436,6 +478,8 @@
             network_id=self.network['id'],
             mac_address=free_mac_address,
             name=data_utils.rand_name(self.__class__.__name__))
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        body['port']['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, body['port']['id'])
         port = body['port']
@@ -450,9 +494,12 @@
         utils.is_extension_enabled('security-group', 'network'),
         'security-group extension not enabled.')
     def test_create_port_with_no_securitygroups(self):
+        """Test creating port without security groups"""
         network = self._create_network()
         self._create_subnet(network)
         port = self.create_port(network, security_groups=[])
+        self.addCleanup(self.ports_client.wait_for_resource_deletion,
+                        port['id'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                         self.ports_client.delete_port, port['id'])
         self.assertIsNotNone(port['security_groups'])
diff --git a/tempest/api/network/test_routers.py b/tempest/api/network/test_routers.py
index 30423e3..c03a8a2 100644
--- a/tempest/api/network/test_routers.py
+++ b/tempest/api/network/test_routers.py
@@ -27,6 +27,7 @@
 
 
 class RoutersTest(base.BaseNetworkTest):
+    """Test routers"""
 
     def _add_router_interface_with_subnet_id(self, router_id, subnet_id):
         interface = self.routers_client.add_router_interface(
@@ -53,6 +54,7 @@
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     def test_create_show_list_update_delete_router(self):
+        """Test create/show/list/update/delete of a router"""
         # Create a router
         router_name = data_utils.rand_name(self.__class__.__name__ + '-router')
         router = self.create_router(
@@ -87,6 +89,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('b42e6e39-2e37-49cc-a6f4-8467e940900a')
     def test_add_remove_router_interface_with_subnet_id(self):
+        """Test adding and removing router interface with subnet id"""
         network_name = data_utils.rand_name(self.__class__.__name__)
         network = self.networks_client.create_network(
             name=network_name)['network']
@@ -113,6 +116,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('2b7d2f37-6748-4d78-92e5-1d590234f0d5')
     def test_add_remove_router_interface_with_port_id(self):
+        """Test adding and removing router interface with port id"""
         network_name = data_utils.rand_name(self.__class__.__name__)
         network = self.networks_client.create_network(
             name=network_name)['network']
@@ -145,6 +149,7 @@
     @decorators.idempotent_id('c86ac3a8-50bd-4b00-a6b8-62af84a0765c')
     @utils.requires_ext(extension='extraroute', service='network')
     def test_update_delete_extra_route(self):
+        """Test updating and deleting router with extra route"""
         # Create different cidr for each subnet to avoid cidr duplicate
         # The cidr starts from project_cidr
         next_cidr = self.cidr
@@ -215,6 +220,7 @@
 
     @decorators.idempotent_id('a8902683-c788-4246-95c7-ad9c6d63a4d9')
     def test_update_router_admin_state(self):
+        """Test updating router's admin state"""
         router = self.create_router()
         self.addCleanup(self.delete_router, router)
         self.assertFalse(router['admin_state_up'])
@@ -228,6 +234,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('802c73c9-c937-4cef-824b-2191e24a6aab')
     def test_add_multiple_router_interfaces(self):
+        """Test adding multiple router interfaces"""
         network_name = data_utils.rand_name(self.__class__.__name__)
         network01 = self.networks_client.create_network(
             name=network_name)['network']
@@ -258,6 +265,7 @@
 
     @decorators.idempotent_id('96522edf-b4b5-45d9-8443-fa11c26e6eff')
     def test_router_interface_port_update_with_fixed_ip(self):
+        """Test updating router interface port's fixed ip"""
         network_name = data_utils.rand_name(self.__class__.__name__)
         network = self.networks_client.create_network(
             name=network_name)['network']
diff --git a/tempest/api/network/test_routers_negative.py b/tempest/api/network/test_routers_negative.py
index 0b61860..10a2706 100644
--- a/tempest/api/network/test_routers_negative.py
+++ b/tempest/api/network/test_routers_negative.py
@@ -21,6 +21,7 @@
 
 
 class RoutersNegativeTest(base.BaseNetworkTest):
+    """Negative tests of routers"""
 
     @classmethod
     def skip_checks(cls):
@@ -39,6 +40,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('37a94fc0-a834-45b9-bd23-9a81d2fd1e22')
     def test_router_add_gateway_invalid_network_returns_404(self):
+        """Test adding gateway with invalid network for router"""
         self.assertRaises(lib_exc.NotFound,
                           self.routers_client.update_router,
                           self.router['id'],
@@ -48,6 +50,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('11836a18-0b15-4327-a50b-f0d9dc66bddd')
     def test_router_add_gateway_net_not_external_returns_400(self):
+        """Test adding gateway with not external network for router"""
         alt_network = self.create_network()
         sub_cidr = self.cidr.next()
         self.create_subnet(alt_network, cidr=sub_cidr)
@@ -60,6 +63,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('957751a3-3c68-4fa2-93b6-eb52ea10db6e')
     def test_add_router_interfaces_on_overlapping_subnets_returns_400(self):
+        """Test adding router interface which is on overlapping subnets"""
         network01 = self.create_network(
             network_name=data_utils.rand_name('router-network01-'))
         network02 = self.create_network(
@@ -79,6 +83,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('04df80f9-224d-47f5-837a-bf23e33d1c20')
     def test_router_remove_interface_in_use_returns_409(self):
+        """Test removing in-use interface from router"""
         self.routers_client.add_router_interface(self.router['id'],
                                                  subnet_id=self.subnet['id'])
         self.addCleanup(self.routers_client.remove_router_interface,
@@ -90,6 +95,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c2a70d72-8826-43a7-8208-0209e6360c47')
     def test_show_non_existent_router_returns_404(self):
+        """Test showing non existent router"""
         router = data_utils.rand_name('non_exist_router')
         self.assertRaises(lib_exc.NotFound, self.routers_client.show_router,
                           router)
@@ -97,6 +103,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b23d1569-8b0c-4169-8d4b-6abd34fad5c7')
     def test_update_non_existent_router_returns_404(self):
+        """Test updating non existent router"""
         router = data_utils.rand_name('non_exist_router')
         self.assertRaises(lib_exc.NotFound, self.routers_client.update_router,
                           router, name="new_name")
@@ -104,6 +111,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c7edc5ad-d09d-41e6-a344-5c0c31e2e3e4')
     def test_delete_non_existent_router_returns_404(self):
+        """Test deleting non existent router"""
         router = data_utils.rand_name('non_exist_router')
         self.assertRaises(lib_exc.NotFound, self.routers_client.delete_router,
                           router)
@@ -114,6 +122,7 @@
 
 
 class DvrRoutersNegativeTest(base.BaseNetworkTest):
+    """Negative tests of DVR router"""
 
     @classmethod
     def skip_checks(cls):
@@ -125,5 +134,6 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('4990b055-8fc7-48ab-bba7-aa28beaad0b9')
     def test_router_create_tenant_distributed_returns_forbidden(self):
+        """Non admin user is not allowed to create distributed router"""
         self.assertRaises(lib_exc.Forbidden, self.create_router,
                           distributed=True)
diff --git a/tempest/api/network/test_security_groups.py b/tempest/api/network/test_security_groups.py
index ef19122..d75acfc 100644
--- a/tempest/api/network/test_security_groups.py
+++ b/tempest/api/network/test_security_groups.py
@@ -21,6 +21,7 @@
 
 
 class SecGroupTest(base.BaseSecGroupTest):
+    """Test security groups"""
 
     @classmethod
     def skip_checks(cls):
@@ -67,7 +68,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('e30abd17-fef9-4739-8617-dc26da88e686')
     def test_list_security_groups(self):
-        # Verify the security group belonging to project exist in list
+        """Verify that default security group exist"""
         body = self.security_groups_client.list_security_groups()
         security_groups = body['security_groups']
         found = None
@@ -80,6 +81,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('bfd128e5-3c92-44b6-9d66-7fe29d22c802')
     def test_create_list_update_show_delete_security_group(self):
+        """Verify create/list/update/show/delete of security group"""
         group_create_body, _ = self._create_security_group()
 
         # List security groups and verify if created group is there in response
@@ -111,6 +113,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('cfb99e0e-7410-4a3d-8a0c-959a63ee77e9')
     def test_create_show_delete_security_group_rule(self):
+        """Test create/show/delete of security group rule"""
         group_create_body, _ = self._create_security_group()
 
         # Create rules for each protocol
@@ -191,7 +194,7 @@
 
     @decorators.idempotent_id('c2ed2deb-7a0c-44d8-8b4c-a5825b5c310b')
     def test_create_security_group_rule_with_remote_group_id(self):
-        # Verify creating security group rule with remote_group_id works
+        """Verify creating security group rule with remote_group_id works"""
         sg1_body, _ = self._create_security_group()
         sg2_body, _ = self._create_security_group()
 
@@ -209,7 +212,7 @@
 
     @decorators.idempotent_id('16459776-5da2-4634-bce4-4b55ee3ec188')
     def test_create_security_group_rule_with_remote_ip_prefix(self):
-        # Verify creating security group rule with remote_ip_prefix works
+        """Verify creating security group rule with remote_ip_prefix works"""
         sg1_body, _ = self._create_security_group()
 
         sg_id = sg1_body['security_group']['id']
@@ -226,9 +229,10 @@
 
     @decorators.idempotent_id('0a307599-6655-4220-bebc-fd70c64f2290')
     def test_create_security_group_rule_with_protocol_integer_value(self):
-        # Verify creating security group rule with the
-        # protocol as integer value
-        # arguments : "protocol": 17
+        """Verify creating security group rule with the integer protocol value
+
+        arguments : "protocol": 17
+        """
         group_create_body, _ = self._create_security_group()
         direction = 'ingress'
         protocol = 17
diff --git a/tempest/api/network/test_security_groups_negative.py b/tempest/api/network/test_security_groups_negative.py
index d054865..beaeb20 100644
--- a/tempest/api/network/test_security_groups_negative.py
+++ b/tempest/api/network/test_security_groups_negative.py
@@ -24,6 +24,7 @@
 
 
 class NegativeSecGroupTest(base.BaseSecGroupTest):
+    """Negative tests of security groups"""
 
     @classmethod
     def skip_checks(cls):
@@ -35,6 +36,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('424fd5c3-9ddc-486a-b45f-39bf0c820fc6')
     def test_show_non_existent_security_group(self):
+        """Test showing non existent security group"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(
             lib_exc.NotFound, self.security_groups_client.show_security_group,
@@ -43,6 +45,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('4c094c09-000b-4e41-8100-9617600c02a6')
     def test_show_non_existent_security_group_rule(self):
+        """Test showing non existent security group rule"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(
             lib_exc.NotFound,
@@ -52,6 +55,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1f1bb89d-5664-4956-9fcd-83ee0fa603df')
     def test_delete_non_existent_security_group(self):
+        """Test deleting non existent security group"""
         non_exist_id = data_utils.rand_uuid()
         self.assertRaises(lib_exc.NotFound,
                           self.security_groups_client.delete_security_group,
@@ -61,6 +65,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('981bdc22-ce48-41ed-900a-73148b583958')
     def test_create_security_group_rule_with_bad_protocol(self):
+        """Test creating security group rule with bad protocol"""
         group_create_body, _ = self._create_security_group()
 
         # Create rule with bad protocol name
@@ -74,6 +79,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5f8daf69-3c5f-4aaa-88c9-db1d66f68679')
     def test_create_security_group_rule_with_bad_remote_ip_prefix(self):
+        """Test creating security group rule with bad remote ip prefix"""
         group_create_body, _ = self._create_security_group()
 
         # Create rule with bad remote_ip_prefix
@@ -89,6 +95,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('4bf786fd-2f02-443c-9716-5b98e159a49a')
     def test_create_security_group_rule_with_non_existent_remote_groupid(self):
+        """Creating security group rule with non existent remote group id"""
         group_create_body, _ = self._create_security_group()
         non_exist_id = data_utils.rand_uuid()
 
@@ -105,6 +112,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b5c4b247-6b02-435b-b088-d10d45650881')
     def test_create_security_group_rule_with_remote_ip_and_group(self):
+        """Test creating security group rule with remote ip and group"""
         sg1_body, _ = self._create_security_group()
         sg2_body, _ = self._create_security_group()
 
@@ -121,6 +129,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5666968c-fff3-40d6-9efc-df1c8bd01abb')
     def test_create_security_group_rule_with_bad_ethertype(self):
+        """Test creating security group rule with bad bad ethertype"""
         group_create_body, _ = self._create_security_group()
 
         # Create rule with bad ethertype
@@ -134,6 +143,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0d9c7791-f2ad-4e2f-ac73-abf2373b0d2d')
     def test_create_security_group_rule_with_invalid_ports(self):
+        """Test creating security group rule with invalid ports"""
         group_create_body, _ = self._create_security_group()
 
         # Create rule for tcp protocol with invalid ports
@@ -168,7 +178,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('2323061e-9fbf-4eb0-b547-7e8fafc90849')
     def test_create_additional_default_security_group_fails(self):
-        # Create security group named 'default', it should be failed.
+        """Test creating additional default security group
+
+        Create security group named 'default', it should be failed.
+        """
         name = 'default'
         self.assertRaises(lib_exc.Conflict,
                           self.security_groups_client.create_security_group,
@@ -177,7 +190,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('966e2b96-023a-11e7-a9e4-fa163e4fa634')
     def test_create_security_group_update_name_default(self):
-        # Update security group name to 'default', it should be failed.
+        """Test updating security group's name to default
+
+        Update security group name to 'default', it should be failed.
+        """
         group_create_body, _ = self._create_security_group()
         self.assertRaises(lib_exc.Conflict,
                           self.security_groups_client.update_security_group,
@@ -187,7 +203,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8fde898f-ce88-493b-adc9-4e4692879fc5')
     def test_create_duplicate_security_group_rule_fails(self):
-        # Create duplicate security group rule, it should fail.
+        """Test creating duplicate security group rule
+
+        Create duplicate security group rule, it should fail.
+        """
         body, _ = self._create_security_group()
 
         min_port = 66
@@ -213,7 +232,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('be308db6-a7cf-4d5c-9baf-71bafd73f35e')
     def test_create_security_group_rule_with_non_existent_security_group(self):
-        # Create security group rules with not existing security group.
+        """Creating security group rules with not existing security group"""
         non_existent_sg = data_utils.rand_uuid()
         self.assertRaises(
             lib_exc.NotFound,
@@ -228,6 +247,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7607439c-af73-499e-bf64-f687fd12a842')
     def test_create_security_group_rule_wrong_ip_prefix_version(self):
+        """Test creating security group rule with wrong ip prefix version"""
         group_create_body, _ = self._create_security_group()
 
         # Create rule with bad remote_ip_prefix
diff --git a/tempest/api/network/test_service_providers.py b/tempest/api/network/test_service_providers.py
index 9ebcd89..5af5244 100644
--- a/tempest/api/network/test_service_providers.py
+++ b/tempest/api/network/test_service_providers.py
@@ -18,12 +18,14 @@
 
 
 class ServiceProvidersTest(base.BaseNetworkTest):
+    """Test network service providers"""
 
     @decorators.idempotent_id('2cbbeea9-f010-40f6-8df5-4eaa0c918ea6')
     @testtools.skipUnless(
         utils.is_extension_enabled('service-type', 'network'),
         'service-type extension not enabled.')
     def test_service_providers_list(self):
+        """Test listing network service providers"""
         body = self.service_providers_client.list_service_providers()
         self.assertIn('service_providers', body)
         self.assertIsInstance(body['service_providers'], list)
diff --git a/tempest/api/network/test_subnetpools_extensions.py b/tempest/api/network/test_subnetpools_extensions.py
index bfc2609..48603ed 100644
--- a/tempest/api/network/test_subnetpools_extensions.py
+++ b/tempest/api/network/test_subnetpools_extensions.py
@@ -49,6 +49,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('62595970-ab1c-4b7f-8fcc-fddfe55e9811')
     def test_create_list_show_update_delete_subnetpools(self):
+        """Test create/list/show/update/delete of subnet pools"""
         subnetpool_name = data_utils.rand_name('subnetpools')
         # create subnet pool
         prefix = CONF.network.default_network
diff --git a/tempest/api/network/test_tags.py b/tempest/api/network/test_tags.py
index 2b9719a..5219c34 100644
--- a/tempest/api/network/test_tags.py
+++ b/tempest/api/network/test_tags.py
@@ -51,7 +51,7 @@
 
     @decorators.idempotent_id('ee76bfaf-ac94-4d74-9ecc-4bbd4c583cb1')
     def test_create_list_show_update_delete_tags(self):
-        # Validate that creating a tag on a network resource works.
+        """Validate that creating a tag on a network resource works"""
         tag_name = data_utils.rand_name(self.__class__.__name__ + '-Tag')
         self.tags_client.create_tag('networks', self.network['id'], tag_name)
         self.addCleanup(self.tags_client.delete_all_tags, 'networks',
@@ -158,6 +158,7 @@
 
     @decorators.idempotent_id('c6231efa-9a89-4adf-b050-2a3156b8a1d9')
     def test_create_check_list_and_delete_tags(self):
+        """Test tag operations on subnets/ports/routers/subnetpools"""
         tag_names = self._create_tags_for_each_resource()
 
         for i, resource in enumerate(self.SUPPORTED_RESOURCES):
@@ -181,6 +182,7 @@
 
     @decorators.idempotent_id('663a90f5-f334-4b44-afe0-c5fc1d408791')
     def test_update_and_delete_all_tags(self):
+        """Test update/delete all tags on subnets/ports/routers/subnetpools"""
         self._create_tags_for_each_resource()
 
         for resource in self.SUPPORTED_RESOURCES:
diff --git a/tempest/api/object_storage/test_account_bulk.py b/tempest/api/object_storage/test_account_bulk.py
index 6599e43..687fe57 100644
--- a/tempest/api/object_storage/test_account_bulk.py
+++ b/tempest/api/object_storage/test_account_bulk.py
@@ -16,12 +16,12 @@
 import tempfile
 
 from tempest.api.object_storage import base
-from tempest.common import custom_matchers
 from tempest.common import utils
 from tempest.lib import decorators
 
 
 class BulkTest(base.BaseObjectTest):
+    """Test bulk operation of archived file"""
 
     def setUp(self):
         super(BulkTest, self).setUp()
@@ -71,22 +71,12 @@
     @decorators.idempotent_id('a407de51-1983-47cc-9f14-47c2b059413c')
     @utils.requires_ext(extension='bulk_upload', service='object')
     def test_extract_archive(self):
-        # Test bulk operation of file upload with an archived file
+        """Test bulk operation of file upload with an archived file"""
         filepath, container_name, object_name = self._create_archive()
         resp = self._upload_archive(filepath)
         self.containers.append(container_name)
 
-        # When uploading an archived file with the bulk operation, the response
-        # does not contain 'content-length' header. This is the special case,
-        # therefore the existence of response headers is checked without
-        # custom matcher.
-        self.assertIn('transfer-encoding', resp.response)
-        self.assertIn('content-type', resp.response)
-        self.assertIn('x-trans-id', resp.response)
-        self.assertIn('date', resp.response)
-
-        # Check only the format of common headers with custom matcher
-        self.assertThat(resp.response, custom_matchers.AreAllWellFormatted())
+        self.assertHeaders(resp.response, 'Account', 'PUT')
 
         param = {'format': 'json'}
         resp, body = self.account_client.list_account_containers(param)
@@ -106,24 +96,14 @@
     @decorators.idempotent_id('c075e682-0d2a-43b2-808d-4116200d736d')
     @utils.requires_ext(extension='bulk_delete', service='object')
     def test_bulk_delete(self):
-        # Test bulk operation of deleting multiple files
+        """Test bulk operation of deleting multiple files"""
         filepath, container_name, object_name = self._create_archive()
         self._upload_archive(filepath)
 
         data = '%s/%s\n%s' % (container_name, object_name, container_name)
         resp = self.bulk_client.delete_bulk_data(data=data)
 
-        # When deleting multiple files using the bulk operation, the response
-        # does not contain 'content-length' header. This is the special case,
-        # therefore the existence of response headers is checked without
-        # custom matcher.
-        self.assertIn('transfer-encoding', resp.response)
-        self.assertIn('content-type', resp.response)
-        self.assertIn('x-trans-id', resp.response)
-        self.assertIn('date', resp.response)
-
-        # Check only the format of common headers with custom matcher
-        self.assertThat(resp.response, custom_matchers.AreAllWellFormatted())
+        self.assertHeaders(resp.response, 'Account', 'DELETE')
 
         # Check if uploaded contents are completely deleted
         self._check_contents_deleted(container_name)
@@ -131,7 +111,7 @@
     @decorators.idempotent_id('dbea2bcb-efbb-4674-ac8a-a5a0e33d1d79')
     @utils.requires_ext(extension='bulk_delete', service='object')
     def test_bulk_delete_by_POST(self):
-        # Test bulk operation of deleting multiple files
+        """Test bulk operation of deleting multiple files by HTTP POST"""
         filepath, container_name, object_name = self._create_archive()
         self._upload_archive(filepath)
 
@@ -139,17 +119,7 @@
 
         resp = self.bulk_client.delete_bulk_data_with_post(data=data)
 
-        # When deleting multiple files using the bulk operation, the response
-        # does not contain 'content-length' header. This is the special case,
-        # therefore the existence of response headers is checked without
-        # custom matcher.
-        self.assertIn('transfer-encoding', resp.response)
-        self.assertIn('content-type', resp.response)
-        self.assertIn('x-trans-id', resp.response)
-        self.assertIn('date', resp.response)
-
-        # Check only the format of common headers with custom matcher
-        self.assertThat(resp.response, custom_matchers.AreAllWellFormatted())
+        self.assertHeaders(resp.response, 'Account', 'POST')
 
         # Check if uploaded contents are completely deleted
         self._check_contents_deleted(container_name)
diff --git a/tempest/api/object_storage/test_account_quotas.py b/tempest/api/object_storage/test_account_quotas.py
index 48f42ec..6854bbe 100644
--- a/tempest/api/object_storage/test_account_quotas.py
+++ b/tempest/api/object_storage/test_account_quotas.py
@@ -22,6 +22,7 @@
 
 
 class AccountQuotasTest(base.BaseObjectTest):
+    """Test account quotas"""
 
     credentials = [['operator', CONF.object_storage.operator_role],
                    ['reseller', CONF.object_storage.reseller_admin_role]]
@@ -79,6 +80,7 @@
     @decorators.idempotent_id('a22ef352-a342-4587-8f47-3bbdb5b039c4')
     @utils.requires_ext(extension='account_quotas', service='object')
     def test_upload_valid_object(self):
+        """Test uploading valid object"""
         object_name = data_utils.rand_name(name="TestObject")
         data = data_utils.arbitrary_string()
         resp, _ = self.object_client.create_object(self.container_name,
diff --git a/tempest/api/object_storage/test_account_services_negative.py b/tempest/api/object_storage/test_account_services_negative.py
index 3e664d7..8d2a501 100644
--- a/tempest/api/object_storage/test_account_services_negative.py
+++ b/tempest/api/object_storage/test_account_services_negative.py
@@ -21,6 +21,7 @@
 
 
 class AccountNegativeTest(base.BaseObjectTest):
+    """Negative tests of account"""
 
     credentials = [['operator', CONF.object_storage.operator_role],
                    ['operator_alt', CONF.object_storage.operator_role]]
@@ -33,7 +34,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('070e6aca-6152-4867-868d-1118d68fb38c')
     def test_list_containers_with_non_authorized_user(self):
-        # list containers using non-authorized user
+        """Test listing containers using non-authorized user"""
 
         test_auth_provider = self.os_operator.auth_provider
         # Get auth for the test user
diff --git a/tempest/api/object_storage/test_container_acl.py b/tempest/api/object_storage/test_container_acl.py
index e9ca0b1..c8731fe 100644
--- a/tempest/api/object_storage/test_container_acl.py
+++ b/tempest/api/object_storage/test_container_acl.py
@@ -22,6 +22,7 @@
 
 
 class ObjectTestACLs(base.BaseObjectTest):
+    """Test object ACLs"""
 
     credentials = [['operator', CONF.object_storage.operator_role],
                    ['operator_alt', CONF.object_storage.operator_role]]
@@ -36,7 +37,7 @@
 
     @decorators.idempotent_id('a3270f3f-7640-4944-8448-c7ea783ea5b6')
     def test_read_object_with_rights(self):
-        # attempt to read object using authorized user
+        """Test reading object using authorized user"""
         # update X-Container-Read metadata ACL
         tenant_id = self.os_roles_operator_alt.credentials.tenant_id
         user_id = self.os_roles_operator_alt.credentials.user_id
@@ -64,7 +65,7 @@
 
     @decorators.idempotent_id('aa58bfa5-40d9-4bc3-82b4-d07f4a9e392a')
     def test_write_object_with_rights(self):
-        # attempt to write object using authorized user
+        """Test writing object using authorized user"""
         # update X-Container-Write metadata ACL
         tenant_id = self.os_roles_operator_alt.credentials.tenant_id
         user_id = self.os_roles_operator_alt.credentials.user_id
diff --git a/tempest/api/object_storage/test_container_acl_negative.py b/tempest/api/object_storage/test_container_acl_negative.py
index 90b24b4..73d7f27 100644
--- a/tempest/api/object_storage/test_container_acl_negative.py
+++ b/tempest/api/object_storage/test_container_acl_negative.py
@@ -22,6 +22,7 @@
 
 
 class ObjectACLsNegativeTest(base.BaseObjectTest):
+    """Negative tests of object ACLs"""
 
     credentials = [['operator', CONF.object_storage.operator_role],
                    ['operator_alt', CONF.object_storage.operator_role]]
@@ -48,6 +49,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('af587587-0c24-4e15-9822-8352ce711013')
     def test_write_object_without_using_creds(self):
+        """Test writing object without using credentials"""
         # trying to create object with empty headers
         # X-Auth-Token is not provided
         object_name = data_utils.rand_name(name='Object')
@@ -62,6 +64,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('af85af0b-a025-4e72-a90e-121babf55720')
     def test_delete_object_without_using_creds(self):
+        """Test deleting object without using credentials"""
         # create object
         object_name = data_utils.rand_name(name='Object')
         self.object_client.create_object(self.container_name, object_name,
@@ -79,7 +82,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('63d84e37-55a6-42e2-9e5f-276e60e26a00')
     def test_write_object_with_non_authorized_user(self):
-        # attempt to upload another file using non-authorized user
+        """Test writing object with non-authorized user"""
         # User provided token is forbidden. ACL are not set
         object_name = data_utils.rand_name(name='Object')
         # trying to create object with non-authorized user
@@ -94,7 +97,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('abf63359-be52-4feb-87dd-447689fc77fd')
     def test_read_object_with_non_authorized_user(self):
-        # attempt to read object using non-authorized user
+        """Test reading object with non-authorized user"""
         # User provided token is forbidden. ACL are not set
         object_name = data_utils.rand_name(name='Object')
         resp, _ = self.object_client.create_object(
@@ -112,7 +115,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7343ac3d-cfed-4198-9bb0-00149741a492')
     def test_delete_object_with_non_authorized_user(self):
-        # attempt to delete object using non-authorized user
+        """Test deleting object with non-authorized user"""
         # User provided token is forbidden. ACL are not set
         object_name = data_utils.rand_name(name='Object')
         resp, _ = self.object_client.create_object(
@@ -130,7 +133,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9ed01334-01e9-41ea-87ea-e6f465582823')
     def test_read_object_without_rights(self):
-        # attempt to read object using non-authorized user
+        """Test reading object without rights"""
         # update X-Container-Read metadata ACL
         cont_headers = {'X-Container-Read': 'badtenant:baduser'}
         resp_meta, _ = (
@@ -155,7 +158,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a3a585a7-d8cf-4b65-a1a0-edc2b1204f85')
     def test_write_object_without_rights(self):
-        # attempt to write object using non-authorized user
+        """Test writing object without rights"""
         # update X-Container-Write metadata ACL
         cont_headers = {'X-Container-Write': 'badtenant:baduser'}
         resp_meta, _ = (
@@ -177,7 +180,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8ba512ad-aa6e-444e-b882-2906a0ea2052')
     def test_write_object_without_write_rights(self):
-        # attempt to write object using non-authorized user
+        """Test writing object without write rights"""
         # update X-Container-Read and X-Container-Write metadata ACL
         tenant_name = self.os_operator.credentials.tenant_name
         username = self.os_operator.credentials.username
@@ -203,7 +206,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b4e366f8-f185-47ab-b789-df4416f9ecdb')
     def test_delete_object_without_write_rights(self):
-        # attempt to delete object using non-authorized user
+        """Test deleting object without write rights"""
         # update X-Container-Read and X-Container-Write metadata ACL
         tenant_name = self.os_operator.credentials.tenant_name
         username = self.os_operator.credentials.username
diff --git a/tempest/api/object_storage/test_container_services.py b/tempest/api/object_storage/test_container_services.py
index cdc420e..7ad6f6f 100644
--- a/tempest/api/object_storage/test_container_services.py
+++ b/tempest/api/object_storage/test_container_services.py
@@ -19,6 +19,8 @@
 
 
 class ContainerTest(base.BaseObjectTest):
+    """Test containers"""
+
     def tearDown(self):
         self.delete_containers()
         super(ContainerTest, self).tearDown()
@@ -26,6 +28,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('92139d73-7819-4db1-85f8-3f2f22a8d91f')
     def test_create_container(self):
+        """Test creating container"""
         container_name = data_utils.rand_name(name='TestContainer')
         resp, _ = self.container_client.update_container(container_name)
         self.containers.append(container_name)
@@ -33,7 +36,7 @@
 
     @decorators.idempotent_id('49f866ed-d6af-4395-93e7-4187eb56d322')
     def test_create_container_overwrite(self):
-        # overwrite container with the same name
+        """Test overwriting container with the same name"""
         container_name = data_utils.rand_name(name='TestContainer')
         self.container_client.update_container(container_name)
         self.containers.append(container_name)
@@ -43,7 +46,7 @@
 
     @decorators.idempotent_id('c2ac4d59-d0f5-40d5-ba19-0635056d48cd')
     def test_create_container_with_metadata_key(self):
-        # create container with the blank value of metadata
+        """Test creating container with the blank value of metadata"""
         container_name = data_utils.rand_name(name='TestContainer')
         headers = {'X-Container-Meta-test-container-meta': ''}
         resp, _ = self.container_client.update_container(
@@ -60,7 +63,7 @@
 
     @decorators.idempotent_id('e1e8df32-7b22-44e1-aa08-ccfd8d446b58')
     def test_create_container_with_metadata_value(self):
-        # create container with metadata value
+        """Test creating container with metadata value"""
         container_name = data_utils.rand_name(name='TestContainer')
 
         # metadata name using underscores should be converted to hyphens
@@ -79,7 +82,7 @@
 
     @decorators.idempotent_id('24d16451-1c0c-4e4f-b59c-9840a3aba40e')
     def test_create_container_with_remove_metadata_key(self):
-        # create container with the blank value of remove metadata
+        """Test creating container with the blank value of remove metadata"""
         container_name = data_utils.rand_name(name='TestContainer')
         headers = {'X-Container-Meta-test-container-meta': 'Meta1'}
         self.container_client.update_container(container_name, **headers)
@@ -97,7 +100,7 @@
 
     @decorators.idempotent_id('8a21ebad-a5c7-4e29-b428-384edc8cd156')
     def test_create_container_with_remove_metadata_value(self):
-        # create container with remove metadata
+        """Test creating container with remove metadata"""
         container_name = data_utils.rand_name(name='TestContainer')
         headers = {'X-Container-Meta-test-container-meta': 'Meta1'}
         self.container_client.update_container(container_name, **headers)
@@ -114,6 +117,7 @@
 
     @decorators.idempotent_id('95d3a249-b702-4082-a2c4-14bb860cf06a')
     def test_delete_container(self):
+        """Test deleting container"""
         # create a container
         container_name = self.create_container()
         # delete container, success asserted within
@@ -123,7 +127,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('312ff6bd-5290-497f-bda1-7c5fec6697ab')
     def test_list_container_contents(self):
-        # get container contents list
+        """Test getting container contents list"""
         container_name = self.create_container()
         object_name, _ = self.create_object(container_name)
 
@@ -134,7 +138,7 @@
 
     @decorators.idempotent_id('4646ac2d-9bfb-4c7d-a3c5-0f527402b3df')
     def test_list_container_contents_with_no_object(self):
-        # get empty container contents list
+        """Test getting empty container contents list"""
         container_name = self.create_container()
 
         resp, object_list = self.container_client.list_container_objects(
@@ -144,7 +148,7 @@
 
     @decorators.idempotent_id('fe323a32-57b9-4704-a996-2e68f83b09bc')
     def test_list_container_contents_with_delimiter(self):
-        # get container contents list using delimiter param
+        """Test getting container contents list using delimiter param"""
         container_name = self.create_container()
         object_name = data_utils.rand_name(name='TestObject/')
         self.create_object(container_name, object_name)
@@ -158,7 +162,7 @@
 
     @decorators.idempotent_id('55b4fa5c-e12e-4ca9-8fcf-a79afe118522')
     def test_list_container_contents_with_end_marker(self):
-        # get container contents list using end_marker param
+        """Test getting container contents list using end_marker param"""
         container_name = self.create_container()
         object_name, _ = self.create_object(container_name)
 
@@ -171,7 +175,7 @@
 
     @decorators.idempotent_id('196f5034-6ab0-4032-9da9-a937bbb9fba9')
     def test_list_container_contents_with_format_json(self):
-        # get container contents list using format_json param
+        """Test getting container contents list using format_json param"""
         container_name = self.create_container()
         self.create_object(container_name)
 
@@ -190,7 +194,7 @@
 
     @decorators.idempotent_id('655a53ca-4d15-408c-a377-f4c6dbd0a1fa')
     def test_list_container_contents_with_format_xml(self):
-        # get container contents list using format_xml param
+        """Test getting container contents list using format_xml param"""
         container_name = self.create_container()
         self.create_object(container_name)
 
@@ -214,7 +218,7 @@
 
     @decorators.idempotent_id('297ec38b-2b61-4ff4-bcd1-7fa055e97b61')
     def test_list_container_contents_with_limit(self):
-        # get container contents list using limit param
+        """Test getting container contents list using limit param"""
         container_name = self.create_container()
         object_name, _ = self.create_object(container_name)
 
@@ -227,7 +231,7 @@
 
     @decorators.idempotent_id('c31ddc63-2a58-4f6b-b25c-94d2937e6867')
     def test_list_container_contents_with_marker(self):
-        # get container contents list using marker param
+        """Test getting container contents list using marker param"""
         container_name = self.create_container()
         object_name, _ = self.create_object(container_name)
 
@@ -240,7 +244,7 @@
 
     @decorators.idempotent_id('58ca6cc9-6af0-408d-aaec-2a6a7b2f0df9')
     def test_list_container_contents_with_path(self):
-        # get container contents list using path param
+        """Test getting container contents list using path param"""
         container_name = self.create_container()
         object_name = data_utils.rand_name(name='TestObject')
         object_name = 'Swift/' + object_name
@@ -255,7 +259,7 @@
 
     @decorators.idempotent_id('77e742c7-caf2-4ec9-8aa4-f7d509a3344c')
     def test_list_container_contents_with_prefix(self):
-        # get container contents list using prefix param
+        """Test getting container contents list using prefix param"""
         container_name = self.create_container()
         object_name, _ = self.create_object(container_name)
 
@@ -270,7 +274,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('96e68f0e-19ec-4aa2-86f3-adc6a45e14dd')
     def test_list_container_metadata(self):
-        # List container metadata
+        """Test listing container metadata"""
         container_name = self.create_container()
 
         metadata = {'name': 'Pictures'}
@@ -286,7 +290,7 @@
 
     @decorators.idempotent_id('a2faf936-6b13-4f8d-92a2-c2278355821e')
     def test_list_no_container_metadata(self):
-        # HEAD container without metadata
+        """Test listing container without metadata"""
         container_name = self.create_container()
 
         resp, _ = self.container_client.list_container_metadata(
@@ -296,7 +300,10 @@
 
     @decorators.idempotent_id('cf19bc0b-7e16-4a5a-aaed-cb0c2fe8deef')
     def test_update_container_metadata_with_create_and_delete_metadata(self):
-        # Send one request of adding and deleting metadata
+        """Test updating container with adding and deleting metadata
+
+        Send one request of adding and deleting metadata.
+        """
         container_name = data_utils.rand_name(name='TestContainer')
         metadata_1 = {'X-Container-Meta-test-container-meta1': 'Meta1'}
         self.container_client.update_container(container_name, **metadata_1)
@@ -319,7 +326,7 @@
 
     @decorators.idempotent_id('2ae5f295-4bf1-4e04-bfad-21e54b62cec5')
     def test_update_container_metadata_with_create_metadata(self):
-        # update container metadata using add metadata
+        """Test updating container metadata using add metadata"""
         container_name = self.create_container()
 
         metadata = {'test-container-meta1': 'Meta1'}
@@ -337,7 +344,7 @@
 
     @decorators.idempotent_id('3a5ce7d4-6e4b-47d0-9d87-7cd42c325094')
     def test_update_container_metadata_with_delete_metadata(self):
-        # update container metadata using delete metadata
+        """Test updating container metadata using delete metadata"""
         container_name = data_utils.rand_name(name='TestContainer')
         metadata = {'X-Container-Meta-test-container-meta1': 'Meta1'}
         self.container_client.update_container(container_name, **metadata)
@@ -355,7 +362,7 @@
 
     @decorators.idempotent_id('31f40a5f-6a52-4314-8794-cd89baed3040')
     def test_update_container_metadata_with_create_metadata_key(self):
-        # update container metadata with a blank value of metadata
+        """Test updating container metadata with a blank value of metadata"""
         container_name = self.create_container()
 
         metadata = {'test-container-meta1': ''}
@@ -371,7 +378,7 @@
 
     @decorators.idempotent_id('a2e36378-6f1f-43f4-840a-ffd9cfd61914')
     def test_update_container_metadata_with_delete_metadata_key(self):
-        # update container metadata with a blank value of metadata
+        """Test updating container metadata with a blank value of metadata"""
         container_name = data_utils.rand_name(name='TestContainer')
         headers = {'X-Container-Meta-test-container-meta1': 'Meta1'}
         self.container_client.update_container(container_name, **headers)
diff --git a/tempest/api/object_storage/test_container_services_negative.py b/tempest/api/object_storage/test_container_services_negative.py
index b8c83b7..31c33db 100644
--- a/tempest/api/object_storage/test_container_services_negative.py
+++ b/tempest/api/object_storage/test_container_services_negative.py
@@ -25,6 +25,7 @@
 
 
 class ContainerNegativeTest(base.BaseObjectTest):
+    """Negative tests of containers"""
 
     @classmethod
     def resource_setup(cls):
@@ -41,7 +42,7 @@
         CONF.object_storage_feature_enabled.discoverability,
         'Discoverability function is disabled')
     def test_create_container_name_exceeds_max_length(self):
-        # Attempts to create a container name that is longer than max
+        """Test creating container with name longer than max"""
         max_length = self.constraints['max_container_name_length']
         # create a container with long name
         container_name = data_utils.arbitrary_string(size=max_length + 1)
@@ -58,8 +59,7 @@
         CONF.object_storage_feature_enabled.discoverability,
         'Discoverability function is disabled')
     def test_create_container_metadata_name_exceeds_max_length(self):
-        # Attempts to create container with metadata name
-        # that is longer than max.
+        """Test creating container with metadata name longer than max"""
         max_length = self.constraints['max_meta_name_length']
         container_name = data_utils.rand_name(name='TestContainer')
         metadata_name = 'X-Container-Meta-' + data_utils.arbitrary_string(
@@ -77,8 +77,7 @@
         CONF.object_storage_feature_enabled.discoverability,
         'Discoverability function is disabled')
     def test_create_container_metadata_value_exceeds_max_length(self):
-        # Attempts to create container with metadata value
-        # that is longer than max.
+        """Test creating container with metadata value longer than max"""
         max_length = self.constraints['max_meta_value_length']
         container_name = data_utils.rand_name(name='TestContainer')
         metadata_value = data_utils.arbitrary_string(size=max_length + 1)
@@ -95,8 +94,7 @@
         CONF.object_storage_feature_enabled.discoverability,
         'Discoverability function is disabled')
     def test_create_container_metadata_exceeds_overall_metadata_count(self):
-        # Attempts to create container with metadata that exceeds the
-        # default count
+        """Test creating container with metadata exceeding default count"""
         max_count = self.constraints['max_meta_count']
         container_name = data_utils.rand_name(name='TestContainer')
         metadata = {}
@@ -113,8 +111,7 @@
     @decorators.attr(type=["negative"])
     @decorators.idempotent_id('1a95ab2e-b712-4a98-8a4d-8ce21b7557d6')
     def test_get_metadata_headers_with_invalid_container_name(self):
-        # Attempts to retrieve metadata headers with an invalid
-        # container name.
+        """Test getting metadata headers with invalid container name"""
         self.assertRaises(exceptions.NotFound,
                           self.container_client.list_container_metadata,
                           'invalid_container_name')
@@ -122,7 +119,7 @@
     @decorators.attr(type=["negative"])
     @decorators.idempotent_id('125a24fa-90a7-4cfc-b604-44e49d788390')
     def test_update_metadata_with_nonexistent_container_name(self):
-        # Attempts to update metadata using a nonexistent container name.
+        """Test updating metadata using a nonexistent container name"""
         metadata = {'animal': 'penguin'}
 
         self.assertRaises(
@@ -133,7 +130,7 @@
     @decorators.attr(type=["negative"])
     @decorators.idempotent_id('65387dbf-a0e2-4aac-9ddc-16eb3f1f69ba')
     def test_delete_with_nonexistent_container_name(self):
-        # Attempts to delete metadata using a nonexistent container name.
+        """Test deleting metadata using a non existent container name"""
         metadata = {'animal': 'penguin'}
 
         self.assertRaises(
@@ -144,8 +141,7 @@
     @decorators.attr(type=["negative"])
     @decorators.idempotent_id('14331d21-1e81-420a-beea-19cb5e5207f5')
     def test_list_all_container_objects_with_nonexistent_container(self):
-        # Attempts to get a listing of all objects on a container
-        # that doesn't exist.
+        """Test getting a list of all objects on a non existent container"""
         params = {'limit': 9999, 'format': 'json'}
         self.assertRaises(exceptions.NotFound,
                           self.container_client.list_container_objects,
@@ -154,8 +150,7 @@
     @decorators.attr(type=["negative"])
     @decorators.idempotent_id('86b2ab08-92d5-493d-acd2-85f0c848819e')
     def test_list_all_container_objects_on_deleted_container(self):
-        # Attempts to get a listing of all objects on a container
-        # that was deleted.
+        """Test getting a list of all objects on a deleted container"""
         container_name = self.create_container()
         # delete container
         resp, _ = self.container_client.delete_container(container_name)
@@ -168,6 +163,7 @@
     @decorators.attr(type=["negative"])
     @decorators.idempotent_id('42da116e-1e8c-4c96-9e06-2f13884ed2b1')
     def test_delete_non_empty_container(self):
+        """Test deleting a container with object in it"""
         # create a container and an object within it
         # attempt to delete a container that isn't empty.
         container_name = self.create_container()
diff --git a/tempest/api/object_storage/test_container_staticweb.py b/tempest/api/object_storage/test_container_staticweb.py
index 1243b83..ef98ed8 100644
--- a/tempest/api/object_storage/test_container_staticweb.py
+++ b/tempest/api/object_storage/test_container_staticweb.py
@@ -21,6 +21,7 @@
 
 
 class StaticWebTest(base.BaseObjectTest):
+    """Test static web"""
 
     @classmethod
     def resource_setup(cls):
@@ -47,6 +48,7 @@
     @decorators.idempotent_id('c1f055ab-621d-4a6a-831f-846fcb578b8b')
     @utils.requires_ext(extension='staticweb', service='object')
     def test_web_index(self):
+        """Test web index"""
         headers = {'web-index': self.object_name}
 
         self.container_client.create_update_or_delete_container_metadata(
@@ -79,6 +81,7 @@
     @decorators.idempotent_id('941814cf-db9e-4b21-8112-2b6d0af10ee5')
     @utils.requires_ext(extension='staticweb', service='object')
     def test_web_listing(self):
+        """Test web listing"""
         headers = {'web-listings': 'true'}
 
         self.container_client.create_update_or_delete_container_metadata(
@@ -111,6 +114,7 @@
     @decorators.idempotent_id('bc37ec94-43c8-4990-842e-0e5e02fc8926')
     @utils.requires_ext(extension='staticweb', service='object')
     def test_web_listing_css(self):
+        """Test web listing css"""
         headers = {'web-listings': 'true',
                    'web-listings-css': 'listings.css'}
 
@@ -134,6 +138,7 @@
     @decorators.idempotent_id('f18b4bef-212e-45e7-b3ca-59af3a465f82')
     @utils.requires_ext(extension='staticweb', service='object')
     def test_web_error(self):
+        """Test web error"""
         headers = {'web-listings': 'true',
                    'web-error': self.object_name}
 
diff --git a/tempest/api/object_storage/test_container_sync.py b/tempest/api/object_storage/test_container_sync.py
index 322579c..bdcb5ae 100644
--- a/tempest/api/object_storage/test_container_sync.py
+++ b/tempest/api/object_storage/test_container_sync.py
@@ -123,7 +123,7 @@
                 self.assertEqual(object_content, obj_name[::-1].encode())
 
     @decorators.attr(type='slow')
-    @decorators.skip_because(bug='1317133')
+    @decorators.unstable_test(bug='1317133')
     @decorators.idempotent_id('be008325-1bba-4925-b7dd-93b58f22ce9b')
     @testtools.skipIf(
         not CONF.object_storage_feature_enabled.container_sync,
diff --git a/tempest/api/object_storage/test_healthcheck.py b/tempest/api/object_storage/test_healthcheck.py
index 8e9e406..f5e2443 100644
--- a/tempest/api/object_storage/test_healthcheck.py
+++ b/tempest/api/object_storage/test_healthcheck.py
@@ -19,12 +19,14 @@
 
 
 class HealthcheckTest(base.BaseObjectTest):
+    """Test healthcheck"""
 
     def setUp(self):
         super(HealthcheckTest, self).setUp()
 
     @decorators.idempotent_id('db5723b1-f25c-49a9-bfeb-7b5640caf337')
     def test_get_healthcheck(self):
+        """Test getting healthcheck"""
         url = self.account_client._get_base_version_url() + "healthcheck"
         resp, body = self.account_client.raw_request(url, "GET")
         self.account_client._error_checker(resp, body)
diff --git a/tempest/api/object_storage/test_object_formpost.py b/tempest/api/object_storage/test_object_formpost.py
index cd834bf..d857d3b 100644
--- a/tempest/api/object_storage/test_object_formpost.py
+++ b/tempest/api/object_storage/test_object_formpost.py
@@ -25,6 +25,7 @@
 
 
 class ObjectFormPostTest(base.BaseObjectTest):
+    """Test object post with form"""
 
     metadata = {}
     containers = []
@@ -110,6 +111,7 @@
     @decorators.idempotent_id('80fac02b-6e54-4f7b-be0d-a965b5cbef76')
     @utils.requires_ext(extension='formpost', service='object')
     def test_post_object_using_form(self):
+        """Test posting object using form"""
         body, content_type = self.get_multipart_form()
 
         headers = {'Content-Type': content_type,
diff --git a/tempest/api/object_storage/test_object_formpost_negative.py b/tempest/api/object_storage/test_object_formpost_negative.py
index df6a0fd..0499eef 100644
--- a/tempest/api/object_storage/test_object_formpost_negative.py
+++ b/tempest/api/object_storage/test_object_formpost_negative.py
@@ -26,6 +26,7 @@
 
 
 class ObjectFormPostNegativeTest(base.BaseObjectTest):
+    """Negative tests of object post with form"""
 
     metadata = {}
     containers = []
@@ -112,6 +113,7 @@
     @utils.requires_ext(extension='formpost', service='object')
     @decorators.attr(type=['negative'])
     def test_post_object_using_form_expired(self):
+        """Test posting object using expired form"""
         body, content_type = self.get_multipart_form(expires=1)
         time.sleep(2)
 
@@ -129,6 +131,7 @@
     @utils.requires_ext(extension='formpost', service='object')
     @decorators.attr(type=['negative'])
     def test_post_object_using_form_invalid_signature(self):
+        """Test posting object using form with invalid signature"""
         self.key = "Wrong"
         body, content_type = self.get_multipart_form()
 
diff --git a/tempest/api/object_storage/test_object_slo.py b/tempest/api/object_storage/test_object_slo.py
index c66776e..8bb2e6e 100644
--- a/tempest/api/object_storage/test_object_slo.py
+++ b/tempest/api/object_storage/test_object_slo.py
@@ -17,7 +17,6 @@
 from oslo_serialization import jsonutils as json
 
 from tempest.api.object_storage import base
-from tempest.common import custom_matchers
 from tempest.common import utils
 from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
@@ -160,17 +159,7 @@
             object_name,
             params=params_del)
 
-        # When deleting SLO using multipart manifest, the response contains
-        # not 'content-length' but 'transfer-encoding' header. This is the
-        # special case, therefore the existence of response headers is checked
-        # outside of custom matcher.
-        self.assertIn('transfer-encoding', resp)
-        self.assertIn('content-type', resp)
-        self.assertIn('x-trans-id', resp)
-        self.assertIn('date', resp)
-
-        # Check only the format of common headers with custom matcher
-        self.assertThat(resp, custom_matchers.AreAllWellFormatted())
+        self.assertHeaders(resp, 'Object', 'DELETE')
 
         resp, body = self.container_client.list_container_objects(
             self.container_name)
diff --git a/tempest/api/object_storage/test_object_temp_url.py b/tempest/api/object_storage/test_object_temp_url.py
index b99f93a..29354b6 100644
--- a/tempest/api/object_storage/test_object_temp_url.py
+++ b/tempest/api/object_storage/test_object_temp_url.py
@@ -25,6 +25,7 @@
 
 
 class ObjectTempUrlTest(base.BaseObjectTest):
+    """Test object temp url"""
 
     @classmethod
     def resource_setup(cls):
@@ -90,6 +91,7 @@
     @decorators.idempotent_id('f91c96d4-1230-4bba-8eb9-84476d18d991')
     @utils.requires_ext(extension='tempurl', service='object')
     def test_get_object_using_temp_url(self):
+        """Test getting object using temp url"""
         expires = self._get_expiry_date()
 
         # get a temp URL for the created object
@@ -109,6 +111,7 @@
     @decorators.idempotent_id('671f9583-86bd-4128-a034-be282a68c5d8')
     @utils.requires_ext(extension='tempurl', service='object')
     def test_get_object_using_temp_url_key_2(self):
+        """Test getting object using metadata 'Temp-URL-Key-2'"""
         key2 = 'Meta2-'
         metadata = {'Temp-URL-Key-2': key2}
         self.account_client.create_update_or_delete_account_metadata(
@@ -134,6 +137,7 @@
     @decorators.idempotent_id('9b08dade-3571-4152-8a4f-a4f2a873a735')
     @utils.requires_ext(extension='tempurl', service='object')
     def test_put_object_using_temp_url(self):
+        """Test putting object using temp url"""
         new_data = data_utils.random_bytes(size=len(self.object_name))
 
         expires = self._get_expiry_date()
@@ -160,6 +164,7 @@
     @decorators.idempotent_id('249a0111-5ad3-4534-86a7-1993d55f9185')
     @utils.requires_ext(extension='tempurl', service='object')
     def test_head_object_using_temp_url(self):
+        """Test HEAD operation of object using temp url"""
         expires = self._get_expiry_date()
 
         # get a temp URL for the created object
@@ -174,6 +179,7 @@
     @decorators.idempotent_id('9d9cfd90-708b-465d-802c-e4a8090b823d')
     @utils.requires_ext(extension='tempurl', service='object')
     def test_get_object_using_temp_url_with_inline_query_parameter(self):
+        """Test getting object using temp url with inline query parameter"""
         expires = self._get_expiry_date()
 
         # get a temp URL for the created object
diff --git a/tempest/api/object_storage/test_object_temp_url_negative.py b/tempest/api/object_storage/test_object_temp_url_negative.py
index 17ae6c1..bbb4827 100644
--- a/tempest/api/object_storage/test_object_temp_url_negative.py
+++ b/tempest/api/object_storage/test_object_temp_url_negative.py
@@ -26,6 +26,7 @@
 
 
 class ObjectTempUrlNegativeTest(base.BaseObjectTest):
+    """Negative tests of object temp url"""
 
     metadata = {}
     containers = []
@@ -96,7 +97,7 @@
     @decorators.idempotent_id('5a583aca-c804-41ba-9d9a-e7be132bdf0b')
     @utils.requires_ext(extension='tempurl', service='object')
     def test_get_object_after_expiration_time(self):
-
+        """Test getting object after expiration time"""
         expires = self._get_expiry_date(1)
         # get a temp URL for the created object
         url = self._get_temp_url(self.container_name,
diff --git a/tempest/api/object_storage/test_object_version.py b/tempest/api/object_storage/test_object_version.py
index 75111b6..b64b172 100644
--- a/tempest/api/object_storage/test_object_version.py
+++ b/tempest/api/object_storage/test_object_version.py
@@ -24,6 +24,8 @@
 
 
 class ContainerTest(base.BaseObjectTest):
+    """Test versioned container"""
+
     def assertContainer(self, container, count, byte, versioned):
         resp, _ = self.container_client.list_container_metadata(container)
         self.assertHeaders(resp, 'Container', 'HEAD')
@@ -39,6 +41,15 @@
         not CONF.object_storage_feature_enabled.object_versioning,
         'Object-versioning is disabled')
     def test_versioned_container(self):
+        """Test versioned container
+
+        1. create container1
+        2. create container2, with container1 as 'X-versions-Location' header
+        3. create object1 in container1
+        4. create 2nd version of object1
+        5. delete object version 2
+        6. delete object version 1
+        """
         # create container
         vers_container_name = data_utils.rand_name(name='TestVersionContainer')
         resp, _ = self.container_client.update_container(vers_container_name)
diff --git a/tempest/api/volume/admin/test_backends_capabilities.py b/tempest/api/volume/admin/test_backends_capabilities.py
index 1351704..3c76eca 100644
--- a/tempest/api/volume/admin/test_backends_capabilities.py
+++ b/tempest/api/volume/admin/test_backends_capabilities.py
@@ -20,6 +20,7 @@
 
 
 class BackendsCapabilitiesAdminTestsJSON(base.BaseVolumeAdminTest):
+    """Test backends capabilities"""
 
     @classmethod
     def resource_setup(cls):
@@ -32,14 +33,16 @@
 
     @decorators.idempotent_id('3750af44-5ea2-4cd4-bc3e-56e7e6caf854')
     def test_get_capabilities_backend(self):
-        # Test backend properties
+        """Test getting backend capabilities"""
         # Check response schema
         self.admin_capabilities_client.show_backend_capabilities(self.hosts[0])
 
     @decorators.idempotent_id('a9035743-d46a-47c5-9cb7-3c80ea16dea0')
     def test_compare_volume_stats_values(self):
-        # Test values comparison between show_backend_capabilities
-        # to show_pools
+        """Test comparing volume stats values
+
+        Compare volume stats between show_backend_capabilities and show_pools.
+        """
         VOLUME_STATS = ('vendor_name',
                         'volume_backend_name',
                         'storage_protocol')
diff --git a/tempest/api/volume/admin/test_group_snapshots.py b/tempest/api/volume/admin/test_group_snapshots.py
index c57766e..0a8b56d 100644
--- a/tempest/api/volume/admin/test_group_snapshots.py
+++ b/tempest/api/volume/admin/test_group_snapshots.py
@@ -62,12 +62,26 @@
 
 
 class GroupSnapshotsTest(BaseGroupSnapshotsTest):
+    """Test group snapshot"""
+
     _api_version = 3
     min_microversion = '3.14'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('1298e537-f1f0-47a3-a1dd-8adec8168897')
     def test_group_snapshot_create_show_list_delete(self):
+        """Test create/show/list/delete group snapshot
+
+        1. Create volume type "volume_type1"
+        2. Create group type "group_type1"
+        3. Create group "group1" with "group_type1" and "volume_type1"
+        4. Create volume "volume1" with "volume_type1" and "group1"
+        5. Create group snapshot "group_snapshot1" with "group1"
+        6. Check snapshot created from "volume1" reaches available status
+        7. Check the created group snapshot "group_snapshot1" is in the list
+           of all group snapshots
+        8. Delete group snapshot "group_snapshot1"
+        """
         # Create volume type
         volume_type = self.create_volume_type()
 
@@ -118,6 +132,18 @@
 
     @decorators.idempotent_id('eff52c70-efc7-45ed-b47a-4ad675d09b81')
     def test_create_group_from_group_snapshot(self):
+        """Test creating group from group snapshot
+
+        1. Create volume type "volume_type1"
+        2. Create group type "group_type1"
+        3. Create group "group1" with "group_type1" and "volume_type1"
+        4. Create volume "volume1" with "volume_type1" and "group1"
+        5. Create group snapshot "group_snapshot1" with "group1"
+        6. Check snapshot created from "volume1" reaches available status
+        7. Create group "group2" from "group_snapshot1"
+        8. Check the volumes belonging to "group2" reach available status
+        9. Check "group2" reaches available status
+        """
         # Create volume type
         volume_type = self.create_volume_type()
 
@@ -161,6 +187,20 @@
     @decorators.idempotent_id('7d7fc000-0b4c-4376-a372-544116d2e127')
     @decorators.related_bug('1739031')
     def test_delete_group_snapshots_following_updated_volumes(self):
+        """Test deleting group snapshot following updated volumes
+
+        1. Create volume type "volume_type1"
+        2. Create group type "group_type1"
+        3. Create group "group1" with "group_type1" and "volume_type1"
+        4. Create 2 volumes "volume1" and "volume2"
+           with "volume_type1" and "group1"
+        5. For each created volume, removing and then adding back to "group1"
+        6. Create group snapshot "group_snapshot1" with "group1"
+        7. Check snapshots created from "volume1" and "volume2" reach
+           available status
+        8. Delete "group_snapshot1"
+        9. Check snapshots created from "volume1" and "volume2" are deleted
+        """
         volume_type = self.create_volume_type()
 
         group_type = self.create_group_type()
@@ -211,6 +251,8 @@
 
 
 class GroupSnapshotsV319Test(BaseGroupSnapshotsTest):
+    """Test group snapshot with volume microversion greater than 3.18"""
+
     _api_version = 3
     min_microversion = '3.19'
     max_microversion = 'latest'
@@ -218,6 +260,7 @@
     @decorators.idempotent_id('3b42c9b9-c984-4444-816e-ca2e1ed30b40')
     @decorators.skip_because(bug='1770179')
     def test_reset_group_snapshot_status(self):
+        """Test resetting group snapshot status to creating/available/error"""
         # Create volume type
         volume_type = self.create_volume_type()
 
diff --git a/tempest/api/volume/admin/test_group_type_specs.py b/tempest/api/volume/admin/test_group_type_specs.py
index c5e6d1a..159c6fb 100644
--- a/tempest/api/volume/admin/test_group_type_specs.py
+++ b/tempest/api/volume/admin/test_group_type_specs.py
@@ -19,12 +19,15 @@
 
 
 class GroupTypeSpecsTest(base.BaseVolumeAdminTest):
+    """Test group type specs"""
+
     _api_version = 3
     min_microversion = '3.11'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('bb4e30d0-de6e-4f4d-866c-dcc48d023b4e')
     def test_group_type_specs_create_show_update_list_delete(self):
+        """Test create/show/update/list/delete group type specs"""
         # Create new group type
         group_type = self.create_group_type()
 
diff --git a/tempest/api/volume/admin/test_group_types.py b/tempest/api/volume/admin/test_group_types.py
index 6723207..3993020 100644
--- a/tempest/api/volume/admin/test_group_types.py
+++ b/tempest/api/volume/admin/test_group_types.py
@@ -19,13 +19,15 @@
 
 
 class GroupTypesTest(base.BaseVolumeAdminTest):
+    """Test group types"""
+
     _api_version = 3
     min_microversion = '3.11'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('dd71e5f9-393e-4d4f-90e9-fa1b8d278864')
     def test_group_type_create_list_update_show(self):
-        # Create/list/show group type.
+        """Test create/list/update/show group type"""
         name = data_utils.rand_name(self.__class__.__name__ + '-group-type')
         description = data_utils.rand_name("group-type-description")
         group_specs = {"consistent_group_snapshot_enabled": "<is> False"}
diff --git a/tempest/api/volume/admin/test_groups.py b/tempest/api/volume/admin/test_groups.py
index 2f6eb6b..e67b985 100644
--- a/tempest/api/volume/admin/test_groups.py
+++ b/tempest/api/volume/admin/test_groups.py
@@ -23,12 +23,15 @@
 
 
 class GroupsTest(base.BaseVolumeAdminTest):
+    """Tests of volume groups with microversion greater than 3.12"""
+
     _api_version = 3
     min_microversion = '3.13'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('4b111d28-b73d-4908-9bd2-03dc2992e4d4')
     def test_group_create_show_list_delete(self):
+        """Test creating, showing, listing and deleting of volume group"""
         # Create volume type
         volume_type = self.create_volume_type()
 
@@ -95,6 +98,7 @@
 
     @decorators.idempotent_id('4a8a6fd2-8b3b-4641-8f54-6a6f99320006')
     def test_group_update(self):
+        """Test updating volume group"""
         # Create volume type
         volume_type = self.create_volume_type()
 
@@ -150,12 +154,15 @@
 
 
 class GroupsV314Test(base.BaseVolumeAdminTest):
+    """Tests of volume groups with microversion greater than 3.13"""
+
     _api_version = 3
     min_microversion = '3.14'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('2424af8c-7851-4888-986a-794b10c3210e')
     def test_create_group_from_group(self):
+        """Test creating volume group from volume group"""
         # Create volume type
         volume_type = self.create_volume_type()
 
@@ -185,12 +192,15 @@
 
 
 class GroupsV320Test(base.BaseVolumeAdminTest):
+    """Tests of volume groups with microversion greater than 3.19"""
+
     _api_version = 3
     min_microversion = '3.20'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('b20c696b-0cbc-49a5-8b3a-b1fb9338f45c')
     def test_reset_group_status(self):
+        """Test resetting volume group status to creating/available/error"""
         # Create volume type
         volume_type = self.create_volume_type()
 
diff --git a/tempest/api/volume/admin/test_multi_backend.py b/tempest/api/volume/admin/test_multi_backend.py
index c5c70d2..a5de987 100644
--- a/tempest/api/volume/admin/test_multi_backend.py
+++ b/tempest/api/volume/admin/test_multi_backend.py
@@ -21,6 +21,7 @@
 
 
 class VolumeMultiBackendTest(base.BaseVolumeAdminTest):
+    """Test volume multi backends"""
 
     @classmethod
     def skip_checks(cls):
@@ -78,24 +79,49 @@
 
     @decorators.idempotent_id('c1a41f3f-9dad-493e-9f09-3ff197d477cc')
     def test_backend_name_reporting(self):
-        # get volume id which created by type without prefix
+        """Test backend name reporting for volume when type is without prefix
+
+        1. Create volume type, with 'volume_backend_name' as extra spec key
+        2. Create volume using the created volume type
+        3. Check 'os-vol-host-attr:host' of the volume info, the value should
+           contain '@' character, like 'cinder@CloveStorage#tecs_backend'
+        """
         for volume_id in self.volume_id_list_without_prefix:
             self._test_backend_name_reporting_by_volume_id(volume_id)
 
     @decorators.idempotent_id('f38e647f-ab42-4a31-a2e7-ca86a6485215')
     def test_backend_name_reporting_with_prefix(self):
-        # get volume id which created by type with prefix
+        """Test backend name reporting for volume when type is with prefix
+
+        1. Create volume type, with 'capabilities:volume_backend_name' as
+           extra spec key
+        2. Create volume using the created volume type
+        3. Check 'os-vol-host-attr:host' of the volume info, the value should
+           contain '@' character, like 'cinder@CloveStorage#tecs_backend'
+        """
         for volume_id in self.volume_id_list_with_prefix:
             self._test_backend_name_reporting_by_volume_id(volume_id)
 
     @decorators.idempotent_id('46435ab1-a0af-4401-8373-f14e66b0dd58')
     def test_backend_name_distinction(self):
-        # get volume ids which created by type without prefix
+        """Test volume backend distinction when type is without prefix
+
+        1. For each backend, create volume type with 'volume_backend_name'
+           as extra spec key
+        2. Create volumes using the created volume types
+        3. Check 'os-vol-host-attr:host' of each created volume is different.
+        """
         self._test_backend_name_distinction(self.volume_id_list_without_prefix)
 
     @decorators.idempotent_id('4236305b-b65a-4bfc-a9d2-69cb5b2bf2ed')
     def test_backend_name_distinction_with_prefix(self):
-        # get volume ids which created by type without prefix
+        """Test volume backend distinction when type is with prefix
+
+        1. For each backend, create volume type with
+           'capabilities:volume_backend_name' as extra spec key
+        2. Create volumes using the created volume types
+        3. Check 'os-vol-host-attr:host' of each created volume is different.
+        """
         self._test_backend_name_distinction(self.volume_id_list_with_prefix)
 
     def _get_volume_host(self, volume_id):
diff --git a/tempest/api/volume/admin/test_snapshot_manage.py b/tempest/api/volume/admin/test_snapshot_manage.py
index 37a47ec..ab0aa38 100644
--- a/tempest/api/volume/admin/test_snapshot_manage.py
+++ b/tempest/api/volume/admin/test_snapshot_manage.py
@@ -48,6 +48,7 @@
 
     @decorators.idempotent_id('0132f42d-0147-4b45-8501-cc504bbf7810')
     def test_unmanage_manage_snapshot(self):
+        """Test unmanaging and managing volume snapshot"""
         # Create a volume
         volume = self.create_volume()
 
diff --git a/tempest/api/volume/admin/test_snapshots_actions.py b/tempest/api/volume/admin/test_snapshots_actions.py
index 41849bc..4fca240 100644
--- a/tempest/api/volume/admin/test_snapshots_actions.py
+++ b/tempest/api/volume/admin/test_snapshots_actions.py
@@ -22,6 +22,8 @@
 
 
 class SnapshotsActionsTest(base.BaseVolumeAdminTest):
+    """Test volume snapshot actions"""
+
     @classmethod
     def skip_checks(cls):
         super(SnapshotsActionsTest, cls).skip_checks()
@@ -65,7 +67,7 @@
 
     @decorators.idempotent_id('3e13ca2f-48ea-49f3-ae1a-488e9180d535')
     def test_reset_snapshot_status(self):
-        # Reset snapshot status to creating
+        """Test resetting snapshot status to creating"""
         status = 'creating'
         self.admin_snapshots_client.reset_snapshot_status(
             self.snapshot['id'], status)
@@ -74,6 +76,10 @@
 
     @decorators.idempotent_id('41288afd-d463-485e-8f6e-4eea159413eb')
     def test_update_snapshot_status(self):
+        """Test updating snapshot
+
+        Update snapshot status to 'error' and progress to '80%'.
+        """
         # Reset snapshot status to creating
         status = 'creating'
         self.admin_snapshots_client.reset_snapshot_status(
@@ -95,20 +101,20 @@
 
     @decorators.idempotent_id('05f711b6-e629-4895-8103-7ca069f2073a')
     def test_snapshot_force_delete_when_snapshot_is_creating(self):
-        # test force delete when status of snapshot is creating
+        """Test force delete when status of snapshot is creating"""
         self._create_reset_and_force_delete_temp_snapshot('creating')
 
     @decorators.idempotent_id('92ce8597-b992-43a1-8868-6316b22a969e')
     def test_snapshot_force_delete_when_snapshot_is_deleting(self):
-        # test force delete when status of snapshot is deleting
+        """Test force delete when status of snapshot is deleting"""
         self._create_reset_and_force_delete_temp_snapshot('deleting')
 
     @decorators.idempotent_id('645a4a67-a1eb-4e8e-a547-600abac1525d')
     def test_snapshot_force_delete_when_snapshot_is_error(self):
-        # test force delete when status of snapshot is error
+        """Test force delete when status of snapshot is error"""
         self._create_reset_and_force_delete_temp_snapshot('error')
 
     @decorators.idempotent_id('bf89080f-8129-465e-9327-b2f922666ba5')
     def test_snapshot_force_delete_when_snapshot_is_error_deleting(self):
-        # test force delete when status of snapshot is error_deleting
+        """Test force delete when status of snapshot is error_deleting"""
         self._create_reset_and_force_delete_temp_snapshot('error_deleting')
diff --git a/tempest/api/volume/admin/test_user_messages.py b/tempest/api/volume/admin/test_user_messages.py
index 8048017..096709c 100644
--- a/tempest/api/volume/admin/test_user_messages.py
+++ b/tempest/api/volume/admin/test_user_messages.py
@@ -22,6 +22,8 @@
 
 
 class UserMessagesTest(base.BaseVolumeAdminTest):
+    """Test volume messages with microversion greater than 3.2"""
+
     _api_version = 3
     min_microversion = '3.3'
     max_microversion = 'latest'
@@ -51,6 +53,7 @@
 
     @decorators.idempotent_id('50f29e6e-f363-42e1-8ad1-f67ae7fd4d5a')
     def test_list_show_messages(self):
+        """Test listing and showing volume messages"""
         message_id = self._create_user_message()
         self.addCleanup(self.messages_client.delete_message, message_id)
 
@@ -62,6 +65,7 @@
 
     @decorators.idempotent_id('c6eb6901-cdcc-490f-b735-4fe251842aed')
     def test_delete_message(self):
+        """Test deleting volume messages"""
         message_id = self._create_user_message()
         self.messages_client.delete_message(message_id)
         self.messages_client.wait_for_resource_deletion(message_id)
diff --git a/tempest/api/volume/admin/test_volume_hosts.py b/tempest/api/volume/admin/test_volume_hosts.py
index 83c27e1..e4e15c5 100644
--- a/tempest/api/volume/admin/test_volume_hosts.py
+++ b/tempest/api/volume/admin/test_volume_hosts.py
@@ -18,9 +18,11 @@
 
 
 class VolumeHostsAdminTestsJSON(base.BaseVolumeAdminTest):
+    """Test fetching volume hosts info by admin users"""
 
     @decorators.idempotent_id('d5f3efa2-6684-4190-9ced-1c2f526352ad')
     def test_list_hosts(self):
+        """Test listing volume hosts"""
         hosts = self.admin_hosts_client.list_hosts()['hosts']
         self.assertGreaterEqual(len(hosts), 2,
                                 "The count of volume hosts is < 2, "
@@ -28,6 +30,7 @@
 
     @decorators.idempotent_id('21168d57-b373-4b71-a3ac-f2c88f0c5d31')
     def test_show_host(self):
+        """Test getting volume host details"""
         hosts = self.admin_hosts_client.list_hosts()['hosts']
         self.assertGreaterEqual(len(hosts), 2,
                                 "The count of volume hosts is < 2, "
diff --git a/tempest/api/volume/admin/test_volume_manage.py b/tempest/api/volume/admin/test_volume_manage.py
index 4b352e0..1e4e7cb 100644
--- a/tempest/api/volume/admin/test_volume_manage.py
+++ b/tempest/api/volume/admin/test_volume_manage.py
@@ -24,6 +24,7 @@
 
 
 class VolumeManageAdminTest(base.BaseVolumeAdminTest):
+    """Test volume manage by admin users"""
 
     @classmethod
     def skip_checks(cls):
@@ -39,6 +40,7 @@
 
     @decorators.idempotent_id('70076c71-0ce1-4208-a8ff-36a66e65cc1e')
     def test_unmanage_manage_volume(self):
+        """Test unmanaging and managing volume"""
         # Create original volume
         org_vol_id = self.create_volume()['id']
         org_vol_info = self.admin_volume_client.show_volume(
diff --git a/tempest/api/volume/admin/test_volume_pools.py b/tempest/api/volume/admin/test_volume_pools.py
index 744bc01..9424994 100644
--- a/tempest/api/volume/admin/test_volume_pools.py
+++ b/tempest/api/volume/admin/test_volume_pools.py
@@ -21,6 +21,8 @@
 
 
 class VolumePoolsAdminTestsJSON(base.BaseVolumeAdminTest):
+    """Test getting volume pools by admin users"""
+
     def _assert_pools(self, with_detail=False):
         cinder_pools = self.admin_scheduler_stats_client.list_pools(
             detail=with_detail)['pools']
@@ -33,8 +35,10 @@
 
     @decorators.idempotent_id('0248a46c-e226-4933-be10-ad6fca8227e7')
     def test_get_pools_without_details(self):
+        """Test getting volume pools without detail"""
         self._assert_pools()
 
     @decorators.idempotent_id('d4bb61f7-762d-4437-b8a4-5785759a0ced')
     def test_get_pools_with_details(self):
+        """Test getting volume pools with detail"""
         self._assert_pools(with_detail=True)
diff --git a/tempest/api/volume/admin/test_volume_quota_classes.py b/tempest/api/volume/admin/test_volume_quota_classes.py
index ee52354..f482788 100644
--- a/tempest/api/volume/admin/test_volume_quota_classes.py
+++ b/tempest/api/volume/admin/test_volume_quota_classes.py
@@ -30,6 +30,7 @@
 
 
 class VolumeQuotaClassesTest(base.BaseVolumeAdminTest):
+    """Test volume quota classes"""
 
     def setUp(self):
         # Note(jeremy.zhang): All test cases in this class need to externally
@@ -44,6 +45,7 @@
 
     @decorators.idempotent_id('abb9198e-67d0-4b09-859f-4f4a1418f176')
     def test_show_default_quota(self):
+        """Test showing default volume quota class set"""
         # response body is validated by schema
         default_quotas = self.admin_quota_classes_client.show_quota_class_set(
             'default')['quota_class_set']
@@ -51,6 +53,11 @@
 
     @decorators.idempotent_id('a7644c63-2669-467a-b00e-452dd5c5397b')
     def test_update_default_quota(self):
+        """Test updating default volume quota class set
+
+        Check current project and new project's default quota are updated
+        to the provided one.
+        """
         LOG.debug("Get the current default quota class values")
         body = self.admin_quota_classes_client.show_quota_class_set(
             'default')['quota_class_set']
diff --git a/tempest/api/volume/admin/test_volume_quotas.py b/tempest/api/volume/admin/test_volume_quotas.py
index b073604..5ab8e87 100644
--- a/tempest/api/volume/admin/test_volume_quotas.py
+++ b/tempest/api/volume/admin/test_volume_quotas.py
@@ -22,6 +22,8 @@
 
 
 class VolumeQuotasAdminTestJSON(base.BaseVolumeAdminTest):
+    """Test volume quotas with admin privilege"""
+
     credentials = ['primary', 'alt', 'admin']
 
     def setUp(self):
@@ -54,17 +56,19 @@
 
     @decorators.idempotent_id('59eada70-403c-4cef-a2a3-a8ce2f1b07a0')
     def test_list_quotas(self):
+        """Test showing volume quota set"""
         # Check response schema
         self.admin_quotas_client.show_quota_set(self.demo_tenant_id)
 
     @decorators.idempotent_id('2be020a2-5fdd-423d-8d35-a7ffbc36e9f7')
     def test_list_default_quotas(self):
+        """Test showing volume default quota set"""
         # Check response schema
         self.admin_quotas_client.show_default_quota_set(self.demo_tenant_id)
 
     @decorators.idempotent_id('3d45c99e-cc42-4424-a56e-5cbd212b63a6')
     def test_update_all_quota_resources_for_tenant(self):
-        # Admin can update all the resource quota limits for a tenant
+        """Test admin can update all the volume quota limits for a project"""
         new_quota_set = {'gigabytes': 1009,
                          'volumes': 11,
                          'snapshots': 11,
@@ -87,14 +91,14 @@
 
     @decorators.idempotent_id('18c51ae9-cb03-48fc-b234-14a19374dbed')
     def test_show_quota_usage(self):
+        """Test showing volume quota usage"""
         # Check response schema
         self.admin_quotas_client.show_quota_set(
             self.os_admin.credentials.tenant_id, params={'usage': True})
 
     @decorators.idempotent_id('874b35a9-51f1-4258-bec5-cd561b6690d3')
     def test_delete_quota(self):
-        # Admin can delete the resource quota set for a project
-
+        """Test admin can delete the volume quota set for a project"""
         self.addCleanup(self.admin_quotas_client.update_quota_set,
                         self.demo_tenant_id, **self.cleanup_quota_set)
 
@@ -112,6 +116,7 @@
 
     @decorators.idempotent_id('ae8b6091-48ad-4bfa-a188-bbf5cc02115f')
     def test_quota_usage(self):
+        """Test volume quota usage is updated after creating volume"""
         quota_usage = self.admin_quotas_client.show_quota_set(
             self.demo_tenant_id, params={'usage': True})['quota_set']
 
@@ -131,6 +136,7 @@
 
     @decorators.idempotent_id('8911036f-9d54-4720-80cc-a1c9796a8805')
     def test_quota_usage_after_volume_transfer(self):
+        """Test volume quota usage is updated after transferring volume"""
         # Create a volume for transfer
         volume = self.create_volume()
         self.addCleanup(self.delete_volume,
diff --git a/tempest/api/volume/admin/test_volume_quotas_negative.py b/tempest/api/volume/admin/test_volume_quotas_negative.py
index 5c7ab15..937d28b 100644
--- a/tempest/api/volume/admin/test_volume_quotas_negative.py
+++ b/tempest/api/volume/admin/test_volume_quotas_negative.py
@@ -24,6 +24,7 @@
 
 
 class VolumeQuotasNegativeTestJSON(base.BaseVolumeAdminTest):
+    """Negative tests of volume quotas"""
 
     @classmethod
     def setup_credentials(cls):
@@ -52,6 +53,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('bf544854-d62a-47f2-a681-90f7a47d86b6')
     def test_quota_volumes(self):
+        """Creating more volume than allowed quota will fail"""
         self.admin_quotas_client.update_quota_set(self.demo_tenant_id,
                                                   volumes=1, gigabytes=-1)
         self.assertRaises(lib_exc.OverLimit,
@@ -61,6 +63,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('2dc27eee-8659-4298-b900-169d71a91374')
     def test_quota_volume_gigabytes(self):
+        """Creating volume with size larger than allowed quota will fail"""
         self.admin_quotas_client.update_quota_set(
             self.demo_tenant_id, gigabytes=CONF.volume.volume_size, volumes=-1)
         self.assertRaises(lib_exc.OverLimit,
@@ -70,6 +73,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d321dc21-d8c6-401f-95fe-49f4845f1a6d')
     def test_volume_extend_gigabytes_quota_deviation(self):
+        """Extending volume with size larger than allowed quota will fail"""
         self.admin_quotas_client.update_quota_set(
             self.demo_tenant_id, gigabytes=CONF.volume.volume_size)
         self.assertRaises(lib_exc.OverLimit,
diff --git a/tempest/api/volume/admin/test_volume_retype.py b/tempest/api/volume/admin/test_volume_retype.py
index 18e0b9b..5c14d52 100644
--- a/tempest/api/volume/admin/test_volume_retype.py
+++ b/tempest/api/volume/admin/test_volume_retype.py
@@ -88,6 +88,7 @@
 
 
 class VolumeRetypeWithMigrationTest(VolumeRetypeTest):
+    """Test volume retype with migration"""
 
     @classmethod
     def skip_checks(cls):
@@ -134,11 +135,25 @@
 
     @decorators.idempotent_id('a1a41f3f-9dad-493e-9f09-3ff197d477cd')
     def test_available_volume_retype_with_migration(self):
+        """Test volume retype with migration
+
+        1. Create volume1 with volume_type1
+        2. Retype volume1 to volume_type2 with migration_policy='on-demand'
+        3. Check volume1's volume_type is changed to volume_type2, and
+           'os-vol-host-attr:host' in the volume info is changed.
+        """
         src_vol = self.create_volume(volume_type=self.src_vol_type['name'])
         self._retype_volume(src_vol, migration_policy='on-demand')
 
     @decorators.idempotent_id('d0d9554f-e7a5-4104-8973-f35b27ccb60d')
     def test_volume_from_snapshot_retype_with_migration(self):
+        """Test volume created from snapshot retype with migration
+
+        1. Create volume1 from snapshot with volume_type1
+        2. Retype volume1 to volume_type2 with migration_policy='on-demand'
+        3. Check volume1's volume_type is changed to volume_type2, and
+           'os-vol-host-attr:host' in the volume info is changed.
+        """
         src_vol = self._create_volume_from_snapshot()
 
         # Migrate the volume from snapshot to the second backend
@@ -146,6 +161,7 @@
 
 
 class VolumeRetypeWithoutMigrationTest(VolumeRetypeTest):
+    """Test volume retype without migration"""
 
     @classmethod
     def resource_setup(cls):
@@ -174,6 +190,13 @@
 
     @decorators.idempotent_id('b90412ee-465d-46e9-b249-ec84a47d5f25')
     def test_available_volume_retype(self):
+        """Test volume retype without migration
+
+        1. Create volume1 with volume_type1
+        2. Retype volume1 to volume_type2 with migration_policy='never'
+        3. Check volume1's volume_type is changed to volume_type2, and
+           'os-vol-host-attr:host' in the volume info is not changed.
+        """
         src_vol = self.create_volume(volume_type=self.src_vol_type['name'])
 
         # Retype the volume from snapshot
diff --git a/tempest/api/volume/admin/test_volume_services.py b/tempest/api/volume/admin/test_volume_services.py
index 293af81..1d12a73 100644
--- a/tempest/api/volume/admin/test_volume_services.py
+++ b/tempest/api/volume/admin/test_volume_services.py
@@ -39,12 +39,14 @@
 
     @decorators.idempotent_id('e0218299-0a59-4f43-8b2b-f1c035b3d26d')
     def test_list_services(self):
+        """Test listing volume services"""
         services = (self.admin_volume_services_client.list_services()
                     ['services'])
         self.assertNotEmpty(services)
 
     @decorators.idempotent_id('63a3e1ca-37ee-4983-826d-83276a370d25')
     def test_get_service_by_service_binary_name(self):
+        """Test getting volume service by binary name"""
         services = (self.admin_volume_services_client.list_services(
             binary=self.binary_name)['services'])
         self.assertNotEmpty(services)
@@ -53,6 +55,7 @@
 
     @decorators.idempotent_id('178710e4-7596-4e08-9333-745cb8bc4f8d')
     def test_get_service_by_host_name(self):
+        """Test getting volume service by service host name"""
         services_on_host = [service for service in self.services if
                             _get_host(service['host']) == self.host_name]
 
@@ -69,6 +72,7 @@
 
     @decorators.idempotent_id('67ec6902-f91d-4dec-91fa-338523208bbc')
     def test_get_service_by_volume_host_name(self):
+        """Test getting volume service by volume host name"""
         volume_id = self.create_volume()['id']
         volume = self.admin_volume_client.show_volume(volume_id)['volume']
         hostname = _get_host(volume['os-vol-host-attr:host'])
@@ -83,7 +87,7 @@
 
     @decorators.idempotent_id('ffa6167c-4497-4944-a464-226bbdb53908')
     def test_get_service_by_service_and_host_name(self):
-
+        """Test getting volume service by binary name and host name"""
         services = (self.admin_volume_services_client.list_services(
             host=self.host_name, binary=self.binary_name))['services']
 
diff --git a/tempest/api/volume/admin/test_volume_services_negative.py b/tempest/api/volume/admin/test_volume_services_negative.py
index 3a863a1..bf39be5 100644
--- a/tempest/api/volume/admin/test_volume_services_negative.py
+++ b/tempest/api/volume/admin/test_volume_services_negative.py
@@ -19,6 +19,7 @@
 
 
 class VolumeServicesNegativeTest(base.BaseVolumeAdminTest):
+    """Negative tests of volume services"""
 
     @classmethod
     def resource_setup(cls):
@@ -30,6 +31,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('3246ce65-ba70-4159-aa3b-082c28e4b484')
     def test_enable_service_with_invalid_host(self):
+        """Test enabling volume service with invalid host should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.admin_volume_services_client.enable_service,
                           host='invalid_host', binary=self.binary)
@@ -37,6 +39,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('c571f179-c6e6-4c50-a0ab-368b628a8ac1')
     def test_disable_service_with_invalid_binary(self):
+        """Test disabling volume service with invalid binary should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.admin_volume_services_client.disable_service,
                           host=self.host, binary='invalid_binary')
@@ -44,6 +47,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('77767b36-5e8f-4c68-a0b5-2308cc21ec64')
     def test_disable_log_reason_with_no_reason(self):
+        """Test disabling volume service with none reason should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.admin_volume_services_client.disable_log_reason,
                           host=self.host, binary=self.binary,
@@ -52,6 +56,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('712bfab8-1f44-4eb5-a632-fa70bf78f05e')
     def test_freeze_host_with_invalid_host(self):
+        """Test freezing volume service with invalid host should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.admin_volume_services_client.freeze_host,
                           host='invalid_host')
@@ -59,6 +64,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('7c6287c9-d655-47e1-9a11-76f6657a6dce')
     def test_thaw_host_with_invalid_host(self):
+        """Test thawing volume service with invalid host should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.admin_volume_services_client.thaw_host,
                           host='invalid_host')
diff --git a/tempest/api/volume/admin/test_volume_snapshot_quotas_negative.py b/tempest/api/volume/admin/test_volume_snapshot_quotas_negative.py
index ff5e7e2..10fd485 100644
--- a/tempest/api/volume/admin/test_volume_snapshot_quotas_negative.py
+++ b/tempest/api/volume/admin/test_volume_snapshot_quotas_negative.py
@@ -24,6 +24,7 @@
 
 
 class VolumeSnapshotQuotasNegativeTestJSON(base.BaseVolumeAdminTest):
+    """Negative tests of volume snapshot quotas"""
 
     @classmethod
     def skip_checks(cls):
@@ -67,6 +68,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('02bbf63f-6c05-4357-9d98-2926a94064ff')
     def test_quota_volume_snapshots(self):
+        """Test creating snapshot exceeding snapshots quota should fail"""
         self.assertRaises(lib_exc.OverLimit,
                           self.snapshots_client.create_snapshot,
                           volume_id=self.volume['id'])
@@ -74,6 +76,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('c99a1ca9-6cdf-498d-9fdf-25832babef27')
     def test_quota_volume_gigabytes_snapshots(self):
+        """Test creating snapshot exceeding gigabytes quota should fail"""
         self.addCleanup(self.admin_quotas_client.update_quota_set,
                         self.demo_tenant_id,
                         **self.shared_quota_set)
diff --git a/tempest/api/volume/admin/test_volume_type_access.py b/tempest/api/volume/admin/test_volume_type_access.py
index b64face..55ec428 100644
--- a/tempest/api/volume/admin/test_volume_type_access.py
+++ b/tempest/api/volume/admin/test_volume_type_access.py
@@ -24,11 +24,13 @@
 
 
 class VolumeTypesAccessTest(base.BaseVolumeAdminTest):
+    """Test volume type access"""
 
     credentials = ['primary', 'alt', 'admin']
 
     @decorators.idempotent_id('d4dd0027-835f-4554-a6e5-50903fb79184')
     def test_volume_type_access_add(self):
+        """Test adding volume type access for non-admin project"""
         # Creating a NON public volume type
         params = {'os-volume-type-access:is_public': False}
         volume_type = self.create_volume_type(**params)
@@ -52,6 +54,7 @@
 
     @decorators.idempotent_id('5220eb28-a435-43ce-baaf-ed46f0e95159')
     def test_volume_type_access_list(self):
+        """Test listing volume type access"""
         # Creating a NON public volume type
         params = {'os-volume-type-access:is_public': False}
         volume_type = self.create_volume_type(**params)
diff --git a/tempest/api/volume/admin/test_volume_types.py b/tempest/api/volume/admin/test_volume_types.py
index ecc850e..ebcd3b7 100644
--- a/tempest/api/volume/admin/test_volume_types.py
+++ b/tempest/api/volume/admin/test_volume_types.py
@@ -23,17 +23,18 @@
 
 
 class VolumeTypesTest(base.BaseVolumeAdminTest):
+    """Test volume types"""
 
     @decorators.idempotent_id('9d9b28e3-1b2e-4483-a2cc-24aa0ea1de54')
     def test_volume_type_list(self):
-        # List volume types.
+        """Test listing volume types"""
         body = \
             self.admin_volume_types_client.list_volume_types()['volume_types']
         self.assertIsInstance(body, list)
 
     @decorators.idempotent_id('c03cc62c-f4e9-4623-91ec-64ce2f9c1260')
     def test_volume_crud_with_volume_type_and_extra_specs(self):
-        # Create/update/get/delete volume with volume_type and extra spec.
+        """Test create/update/get/delete volume with volume_type"""
         volume_types = list()
         vol_name = data_utils.rand_name(self.__class__.__name__ + '-volume')
         proto = CONF.volume.storage_protocol
@@ -80,7 +81,7 @@
 
     @decorators.idempotent_id('4e955c3b-49db-4515-9590-0c99f8e471ad')
     def test_volume_type_create_get_delete(self):
-        # Create/get volume type.
+        """Test create/get/delete volume type"""
         name = data_utils.rand_name(self.__class__.__name__ + '-volume-type')
         description = data_utils.rand_name("volume-type-description")
         proto = CONF.volume.storage_protocol
@@ -118,7 +119,7 @@
 
     @decorators.idempotent_id('7830abd0-ff99-4793-a265-405684a54d46')
     def test_volume_type_encryption_create_get_update_delete(self):
-        # Create/get/update/delete encryption type.
+        """Test create/get/update/delete volume encryption type"""
         create_kwargs = {'provider': 'LuksEncryptor',
                          'control_location': 'front-end'}
         volume_type_id = self.create_volume_type()['id']
@@ -175,6 +176,7 @@
 
     @decorators.idempotent_id('cf9f07c6-db9e-4462-a243-5933ad65e9c8')
     def test_volume_type_update(self):
+        """Test updating volume type details"""
         # Create volume type
         volume_type = self.create_volume_type()
 
diff --git a/tempest/api/volume/admin/test_volume_types_extra_specs.py b/tempest/api/volume/admin/test_volume_types_extra_specs.py
index 730acdf..852aa93 100644
--- a/tempest/api/volume/admin/test_volume_types_extra_specs.py
+++ b/tempest/api/volume/admin/test_volume_types_extra_specs.py
@@ -19,6 +19,7 @@
 
 
 class VolumeTypesExtraSpecsTest(base.BaseVolumeAdminTest):
+    """Test volume type extra specs"""
 
     @classmethod
     def resource_setup(cls):
@@ -27,7 +28,7 @@
 
     @decorators.idempotent_id('b42923e9-0452-4945-be5b-d362ae533e60')
     def test_volume_type_extra_specs_list(self):
-        # List Volume types extra specs.
+        """Test listing volume type extra specs"""
         extra_specs = {"spec1": "val1"}
         body = self.admin_volume_types_client.create_volume_type_extra_specs(
             self.volume_type['id'], extra_specs)['extra_specs']
@@ -40,7 +41,7 @@
 
     @decorators.idempotent_id('0806db36-b4a0-47a1-b6f3-c2e7f194d017')
     def test_volume_type_extra_specs_update(self):
-        # Update volume type extra specs
+        """Test updating volume type extra specs"""
         extra_specs = {"spec2": "val1"}
         body = self.admin_volume_types_client.create_volume_type_extra_specs(
             self.volume_type['id'], extra_specs)['extra_specs']
@@ -74,7 +75,7 @@
 
     @decorators.idempotent_id('d4772798-601f-408a-b2a5-29e8a59d1220')
     def test_volume_type_extra_spec_create_get_delete(self):
-        # Create/Get/Delete volume type extra spec.
+        """Test Create/Get/Delete volume type extra specs"""
         spec_key = "spec3"
         extra_specs = {spec_key: "val1"}
         body = self.admin_volume_types_client.create_volume_type_extra_specs(
diff --git a/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py b/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
index fe249d6..6b2a278 100644
--- a/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
+++ b/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
@@ -20,6 +20,7 @@
 
 
 class ExtraSpecsNegativeTest(base.BaseVolumeAdminTest):
+    """Negative tests of volume type extra specs"""
 
     @classmethod
     def resource_setup(cls):
@@ -30,7 +31,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('08961d20-5cbb-4910-ac0f-89ad6dbb2da1')
     def test_update_no_body(self):
-        # Should not update volume type extra specs with no body
+        """Test updating volume type extra specs with no body should fail"""
         self.assertRaises(
             lib_exc.BadRequest,
             self.admin_volume_types_client.update_volume_type_extra_specs,
@@ -39,7 +40,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('25e5a0ee-89b3-4c53-8310-236f76c75365')
     def test_update_nonexistent_extra_spec_id(self):
-        # Should not update volume type extra specs with nonexistent id.
+        """Test updating volume type extra specs with non existent name
+
+        Updating volume type extra specs with non existent extra spec name
+        should fail.
+        """
         extra_spec = {"spec1": "val2"}
         self.assertRaises(
             lib_exc.BadRequest,
@@ -50,7 +55,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9bf7a657-b011-4aec-866d-81c496fbe5c8')
     def test_update_none_extra_spec_id(self):
-        # Should not update volume type extra specs with none id.
+        """Test updating volume type extra specs without name
+
+        Updating volume type extra specs without extra spec name should fail.
+        """
         extra_spec = {"spec1": "val2"}
         self.assertRaises(
             lib_exc.BadRequest,
@@ -60,8 +68,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('a77dfda2-9100-448e-9076-ed1711f4bdfc')
     def test_update_multiple_extra_spec(self):
-        # Should not update volume type extra specs with multiple specs as
-        # body.
+        """Test updating multiple volume type extra specs should fail"""
         extra_spec = {"spec1": "val2", "spec2": "val1"}
         self.assertRaises(
             lib_exc.BadRequest,
@@ -72,8 +79,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('49d5472c-a53d-4eab-a4d3-450c4db1c545')
     def test_create_nonexistent_type_id(self):
-        # Should not create volume type extra spec for nonexistent volume
-        # type id.
+        """Test creating volume type extra specs for non existent volume type
+
+        Creating volume type extra specs for non existent volume type should
+        fail.
+        """
         extra_specs = {"spec2": "val1"}
         self.assertRaises(
             lib_exc.NotFound,
@@ -83,7 +93,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c821bdc8-43a4-4bf4-86c8-82f3858d5f7d')
     def test_create_none_body(self):
-        # Should not create volume type extra spec for none POST body.
+        """Test creating volume type extra spec with none POST body
+
+        Creating volume type extra spec with none POST body should fail.
+        """
         self.assertRaises(
             lib_exc.BadRequest,
             self.admin_volume_types_client.create_volume_type_extra_specs,
@@ -92,7 +105,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('bc772c71-1ed4-4716-b945-8b5ed0f15e87')
     def test_create_invalid_body(self):
-        # Should not create volume type extra spec for invalid POST body.
+        """Test creating volume type extra spec with invalid POST body
+
+        Creating volume type extra spec with invalid POST body should fail.
+        """
         self.assertRaises(
             lib_exc.BadRequest,
             self.admin_volume_types_client.create_volume_type_extra_specs,
@@ -101,8 +117,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('031cda8b-7d23-4246-8bf6-bbe73fd67074')
     def test_delete_nonexistent_volume_type_id(self):
-        # Should not delete volume type extra spec for nonexistent
-        # type id.
+        """Test deleting volume type extra spec for non existent volume type
+
+        Deleting volume type extra spec for non existent volume type should
+        fail.
+        """
         self.assertRaises(
             lib_exc.NotFound,
             self.admin_volume_types_client.delete_volume_type_extra_specs,
@@ -111,7 +130,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('dee5cf0c-cdd6-4353-b70c-e847050d71fb')
     def test_list_nonexistent_volume_type_id(self):
-        # Should not list volume type extra spec for nonexistent type id.
+        """Test listing volume type extra spec for non existent volume type
+
+        Listing volume type extra spec for non existent volume type should
+        fail.
+        """
         self.assertRaises(
             lib_exc.NotFound,
             self.admin_volume_types_client.list_volume_types_extra_specs,
@@ -120,7 +143,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9f402cbd-1838-4eb4-9554-126a6b1908c9')
     def test_get_nonexistent_volume_type_id(self):
-        # Should not get volume type extra spec for nonexistent type id.
+        """Test getting volume type extra spec for non existent volume type
+
+        Getting volume type extra spec for non existent volume type should
+        fail.
+        """
         self.assertRaises(
             lib_exc.NotFound,
             self.admin_volume_types_client.show_volume_type_extra_specs,
@@ -129,8 +156,11 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c881797d-12ff-4f1a-b09d-9f6212159753')
     def test_get_nonexistent_extra_spec_name(self):
-        # Should not get volume type extra spec for nonexistent extra spec
-        # name.
+        """Test getting volume type extra spec for non existent spec name
+
+        Getting volume type extra spec for non existent extra spec name should
+        fail.
+        """
         self.assertRaises(
             lib_exc.NotFound,
             self.admin_volume_types_client.show_volume_type_extra_specs,
diff --git a/tempest/api/volume/admin/test_volume_types_negative.py b/tempest/api/volume/admin/test_volume_types_negative.py
index ae29049..174cf9e 100644
--- a/tempest/api/volume/admin/test_volume_types_negative.py
+++ b/tempest/api/volume/admin/test_volume_types_negative.py
@@ -20,11 +20,12 @@
 
 
 class VolumeTypesNegativeTest(base.BaseVolumeAdminTest):
+    """Negative tests of volume type"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('878b4e57-faa2-4659-b0d1-ce740a06ae81')
     def test_create_with_empty_name(self):
-        # Should not be able to create volume type with an empty name.
+        """Test creating volume type with an empty name will fail"""
         self.assertRaises(
             lib_exc.BadRequest,
             self.admin_volume_types_client.create_volume_type, name='')
@@ -32,7 +33,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('994610d6-0476-4018-a644-a2602ef5d4aa')
     def test_get_nonexistent_type_id(self):
-        # Should not be able to get volume type with nonexistent type id.
+        """Test getting volume type with nonexistent type id will fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.admin_volume_types_client.show_volume_type,
                           data_utils.rand_uuid())
@@ -40,7 +41,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6b3926d2-7d73-4896-bc3d-e42dfd11a9f6')
     def test_delete_nonexistent_type_id(self):
-        # Should not be able to delete volume type with nonexistent type id.
+        """Test deleting volume type with nonexistent type id will fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.admin_volume_types_client.delete_volume_type,
                           data_utils.rand_uuid())
@@ -48,7 +49,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8c09f849-f225-4d78-ba87-bffd9a5e0c6f')
     def test_create_volume_with_private_volume_type(self):
-        # Should not be able to create volume with private volume type.
+        """Test creating volume with private volume type will fail"""
         params = {'os-volume-type-access:is_public': False}
         volume_type = self.create_volume_type(**params)
         self.assertRaises(lib_exc.NotFound,
diff --git a/tempest/api/volume/admin/test_volumes_actions.py b/tempest/api/volume/admin/test_volumes_actions.py
index 5bac3d8..ecddfba 100644
--- a/tempest/api/volume/admin/test_volumes_actions.py
+++ b/tempest/api/volume/admin/test_volumes_actions.py
@@ -23,6 +23,8 @@
 
 
 class VolumesActionsTest(base.BaseVolumeAdminTest):
+    """Test volume actions"""
+
     create_default_network = True
 
     def _create_reset_and_force_delete_temp_volume(self, status=None):
@@ -38,7 +40,10 @@
 
     @decorators.idempotent_id('d063f96e-a2e0-4f34-8b8a-395c42de1845')
     def test_volume_reset_status(self):
-        # test volume reset status : available->error->available->maintenance
+        """Test resetting volume status
+
+        Reset volume status to available->error->available->maintenance
+        """
         volume = self.create_volume()
         self.addCleanup(waiters.wait_for_volume_resource_status,
                         self.volumes_client, volume['id'], 'available')
@@ -52,27 +57,28 @@
 
     @decorators.idempotent_id('21737d5a-92f2-46d7-b009-a0cc0ee7a570')
     def test_volume_force_delete_when_volume_is_creating(self):
-        # test force delete when status of volume is creating
+        """Test force deleting volume when its status is creating"""
         self._create_reset_and_force_delete_temp_volume('creating')
 
     @decorators.idempotent_id('db8d607a-aa2e-4beb-b51d-d4005c232011')
     def test_volume_force_delete_when_volume_is_attaching(self):
-        # test force delete when status of volume is attaching
+        """Test force deleting volume when its status is attaching"""
         self._create_reset_and_force_delete_temp_volume('attaching')
 
     @decorators.idempotent_id('3e33a8a8-afd4-4d64-a86b-c27a185c5a4a')
     def test_volume_force_delete_when_volume_is_error(self):
-        # test force delete when status of volume is error
+        """Test force deleting volume when its status is error"""
         self._create_reset_and_force_delete_temp_volume('error')
 
     @decorators.idempotent_id('b957cabd-1486-4e21-90cf-a9ed3c39dfb2')
     def test_volume_force_delete_when_volume_is_maintenance(self):
-        # test force delete when status of volume is maintenance
+        """Test force deleting volume when its status is maintenance"""
         self._create_reset_and_force_delete_temp_volume('maintenance')
 
     @decorators.idempotent_id('d38285d9-929d-478f-96a5-00e66a115b81')
     @utils.services('compute')
     def test_force_detach_volume(self):
+        """Test force detaching volume when its status is error"""
         # Create a server and a volume
         server_id = self.create_server()['id']
         volume_id = self.create_volume()['id']
@@ -102,5 +108,4 @@
         waiters.wait_for_volume_resource_status(self.volumes_client,
                                                 volume_id, 'available')
         vol_info = self.volumes_client.show_volume(volume_id)['volume']
-        self.assertIn('attachments', vol_info)
         self.assertEmpty(vol_info['attachments'])
diff --git a/tempest/api/volume/admin/test_volumes_backup.py b/tempest/api/volume/admin/test_volumes_backup.py
index 45060d0..835cc1d 100644
--- a/tempest/api/volume/admin/test_volumes_backup.py
+++ b/tempest/api/volume/admin/test_volumes_backup.py
@@ -26,6 +26,7 @@
 
 
 class VolumesBackupsAdminTest(base.BaseVolumeAdminTest):
+    """Test volume backups"""
 
     @classmethod
     def skip_checks(cls):
@@ -67,11 +68,8 @@
         # Export Backup
         export_backup = (self.admin_backups_client.export_backup(backup['id'])
                          ['backup-record'])
-        self.assertIn('backup_service', export_backup)
-        self.assertIn('backup_url', export_backup)
         self.assertTrue(export_backup['backup_service'].startswith(
                         'cinder.backup.drivers'))
-        self.assertIsNotNone(export_backup['backup_url'])
 
         # NOTE(geguileo): Backups are imported with the same backup id
         # (important for incremental backups among other things), so we cannot
@@ -92,7 +90,6 @@
         # deletions will delete data from the backup back-end because they
         # were both pointing to the same backend data.
         self.addCleanup(self._delete_backup, new_id)
-        self.assertIn("id", import_backup)
         self.assertEqual(new_id, import_backup['id'])
         waiters.wait_for_volume_resource_status(self.admin_backups_client,
                                                 import_backup['id'],
@@ -122,6 +119,7 @@
 
     @decorators.idempotent_id('47a35425-a891-4e13-961c-c45deea21e94')
     def test_volume_backup_reset_status(self):
+        """Test resetting volume backup status to error"""
         # Create a volume
         volume = self.create_volume()
         # Create a backup
diff --git a/tempest/api/volume/admin/test_volumes_list.py b/tempest/api/volume/admin/test_volumes_list.py
index 6ce4a85..c3229f0 100644
--- a/tempest/api/volume/admin/test_volumes_list.py
+++ b/tempest/api/volume/admin/test_volumes_list.py
@@ -24,6 +24,7 @@
 
 
 class VolumesListAdminTestJSON(base.BaseVolumeAdminTest):
+    """Test listing volumes with admin privilege"""
 
     @classmethod
     def resource_setup(cls):
@@ -41,7 +42,7 @@
 
     @decorators.idempotent_id('5866286f-3290-4cfd-a414-088aa6cdc469')
     def test_volume_list_param_tenant(self):
-        # Test to list volumes from single tenant
+        """Test admin can list volumes belonging to specified project"""
         # Create a volume in admin tenant
         adm_vol = self.admin_volume_client.create_volume(
             size=CONF.volume.volume_size)['volume']
diff --git a/tempest/api/volume/test_availability_zone.py b/tempest/api/volume/test_availability_zone.py
index 0b6ee38..39369be 100644
--- a/tempest/api/volume/test_availability_zone.py
+++ b/tempest/api/volume/test_availability_zone.py
@@ -22,7 +22,7 @@
 
     @decorators.idempotent_id('01f1ae88-eba9-4c6b-a011-6f7ace06b725')
     def test_get_availability_zone_list(self):
-        # List of availability zone
+        """Test listing volume available zones"""
         availability_zone = (
             self.availability_zone_client.list_availability_zones()
             ['availabilityZoneInfo'])
diff --git a/tempest/api/volume/test_extensions.py b/tempest/api/volume/test_extensions.py
index 39ce00c..acd9ca2 100644
--- a/tempest/api/volume/test_extensions.py
+++ b/tempest/api/volume/test_extensions.py
@@ -26,10 +26,11 @@
 
 
 class ExtensionsTestJSON(base.BaseVolumeTest):
+    """Test volume extensions"""
 
     @decorators.idempotent_id('94607eb0-43a5-47ca-82aa-736b41bd2e2c')
     def test_list_extensions(self):
-        # List of all extensions
+        """Test listing volume extensions"""
         extensions = (self.volumes_extension_client.list_extensions()
                       ['extensions'])
         if not CONF.volume_feature_enabled.api_extensions:
diff --git a/tempest/api/volume/test_image_metadata.py b/tempest/api/volume/test_image_metadata.py
index 53b3acc..8f9bbd2 100644
--- a/tempest/api/volume/test_image_metadata.py
+++ b/tempest/api/volume/test_image_metadata.py
@@ -24,6 +24,7 @@
 
 
 class VolumesImageMetadata(base.BaseVolumeTest):
+    """Test volume image metadata"""
 
     @classmethod
     def skip_checks(cls):
@@ -41,6 +42,7 @@
     @decorators.idempotent_id('03efff0b-5c75-4822-8f10-8789ac15b13e')
     @utils.services('image')
     def test_update_show_delete_image_metadata(self):
+        """Test update/show/delete volume's image metadata"""
         # Update image metadata
         image_metadata = {'image_id': '5137a025-3c5f-43c1-bc64-5f41270040a5',
                           'image_name': 'image',
diff --git a/tempest/api/volume/test_snapshot_metadata.py b/tempest/api/volume/test_snapshot_metadata.py
index e6fe25d..ee1b5e5 100644
--- a/tempest/api/volume/test_snapshot_metadata.py
+++ b/tempest/api/volume/test_snapshot_metadata.py
@@ -23,6 +23,8 @@
 
 
 class SnapshotMetadataTestJSON(base.BaseVolumeTest):
+    """Test snapshot metadata"""
+
     @classmethod
     def skip_checks(cls):
         super(SnapshotMetadataTestJSON, cls).skip_checks()
@@ -45,6 +47,7 @@
 
     @decorators.idempotent_id('a2f20f99-e363-4584-be97-bc33afb1a56c')
     def test_crud_snapshot_metadata(self):
+        """Test create/get/update/delete snapshot metadata"""
         # Create metadata for the snapshot
         metadata = {"key1": "value1",
                     "key2": "value2",
@@ -82,7 +85,7 @@
 
     @decorators.idempotent_id('e8ff85c5-8f97-477f-806a-3ac364a949ed')
     def test_update_show_snapshot_metadata_item(self):
-        # Update metadata item for the snapshot
+        """Test update/show snapshot metadata item"""
         metadata = {"key1": "value1",
                     "key2": "value2",
                     "key3": "value3"}
diff --git a/tempest/api/volume/test_versions.py b/tempest/api/volume/test_versions.py
index 1e5c9de..e065bdf 100644
--- a/tempest/api/volume/test_versions.py
+++ b/tempest/api/volume/test_versions.py
@@ -17,14 +17,14 @@
 
 
 class VersionsTest(base.BaseVolumeTest):
-    """Test cinder versions"""
+    """Test volume versions"""
 
     _api_version = 3
 
     @decorators.idempotent_id('77838fc4-b49b-4c64-9533-166762517369')
     @decorators.attr(type='smoke')
     def test_list_versions(self):
-        """Test listing cinder versions"""
+        """Test listing volume versions"""
         # NOTE: The version data is checked on service client side
         #       with JSON-Schema validation. It is enough to just call
         #       the API here.
@@ -32,7 +32,7 @@
 
     @decorators.idempotent_id('7f755ae2-caa9-4049-988c-331d8f7a579f')
     def test_show_version(self):
-        "Test getting cinder version details"
+        """Test getting volume version details"""
         # NOTE: The version data is checked on service client side
         # with JSON-Schema validation. So we will loop through each
         # version and call show version.
diff --git a/tempest/api/volume/test_volume_absolute_limits.py b/tempest/api/volume/test_volume_absolute_limits.py
index 4d64a95..ccf0804 100644
--- a/tempest/api/volume/test_volume_absolute_limits.py
+++ b/tempest/api/volume/test_volume_absolute_limits.py
@@ -24,6 +24,7 @@
 # it requires force_tenant_isolation=True, which need admin
 # credentials to create non-admin users for the tests.
 class AbsoluteLimitsTests(base.BaseVolumeAdminTest):  # noqa: T115
+    """Test volume absolute limits"""
 
     # avoid existing volumes of pre-defined tenant
     force_tenant_isolation = True
@@ -43,7 +44,7 @@
 
     @decorators.idempotent_id('8e943f53-e9d6-4272-b2e9-adcf2f7c29ad')
     def test_get_volume_absolute_limits(self):
-        # get volume limit for a tenant
+        """Test getting volume absolute limits"""
         absolute_limits = \
             self.volume_limits_client.show_limits(
             )['limits']['absolute']
diff --git a/tempest/api/volume/test_volumes_actions.py b/tempest/api/volume/test_volumes_actions.py
index 9edffc6..5b50bfa 100644
--- a/tempest/api/volume/test_volumes_actions.py
+++ b/tempest/api/volume/test_volumes_actions.py
@@ -25,6 +25,8 @@
 
 
 class VolumesActionsTest(base.BaseVolumeTest):
+    """Test volume actions"""
+
     create_default_network = True
 
     @classmethod
@@ -38,6 +40,7 @@
     @decorators.attr(type='smoke')
     @utils.services('compute')
     def test_attach_detach_volume_to_instance(self):
+        """Test attaching and detaching volume to instance"""
         # Create a server
         server = self.create_server()
         # Volume is attached and detached successfully from an instance
@@ -53,7 +56,7 @@
 
     @decorators.idempotent_id('63e21b4c-0a0c-41f6-bfc3-7c2816815599')
     def test_volume_bootable(self):
-        # Verify that a volume bootable flag is retrieved
+        """Test setting and retrieving bootable flag of a volume"""
         for bool_bootable in [True, False]:
             self.volumes_client.set_bootable_volume(self.volume['id'],
                                                     bootable=bool_bootable)
@@ -69,6 +72,11 @@
     @decorators.idempotent_id('9516a2c8-9135-488c-8dd6-5677a7e5f371')
     @utils.services('compute')
     def test_get_volume_attachment(self):
+        """Test getting volume attachments
+
+        Attach a volume to a server, and then retrieve volume's attachments
+        info.
+        """
         # Create a server
         server = self.create_server()
         # Verify that a volume's attachment information is retrieved
@@ -84,7 +92,6 @@
                         self.volume['id'], 'available')
         self.addCleanup(self.volumes_client.detach_volume, self.volume['id'])
         volume = self.volumes_client.show_volume(self.volume['id'])['volume']
-        self.assertIn('attachments', volume)
         attachment = volume['attachments'][0]
 
         self.assertEqual('/dev/%s' %
@@ -97,6 +104,7 @@
     @decorators.idempotent_id('d8f1ca95-3d5b-44a3-b8ca-909691c9532d')
     @utils.services('image')
     def test_volume_upload(self):
+        """Test uploading volume to create an image"""
         # NOTE(gfidente): the volume uploaded in Glance comes from setUpClass,
         # it is shared with the other tests. After it is uploaded in Glance,
         # there is no way to delete it from Cinder, so we delete it from Glance
@@ -119,6 +127,7 @@
 
     @decorators.idempotent_id('92c4ef64-51b2-40c0-9f7e-4749fbaaba33')
     def test_reserve_unreserve_volume(self):
+        """Test reserving and unreserving volume"""
         # Mark volume as reserved.
         self.volumes_client.reserve_volume(self.volume['id'])
         # To get the volume info
@@ -132,6 +141,7 @@
 
     @decorators.idempotent_id('fff74e1e-5bd3-4b33-9ea9-24c103bc3f59')
     def test_volume_readonly_update(self):
+        """Test updating and retrieve volume's readonly flag"""
         for readonly in [True, False]:
             # Update volume readonly
             self.volumes_client.update_volume_readonly(self.volume['id'],
diff --git a/tempest/api/volume/test_volumes_backup.py b/tempest/api/volume/test_volumes_backup.py
index c178272..2e78114 100644
--- a/tempest/api/volume/test_volumes_backup.py
+++ b/tempest/api/volume/test_volumes_backup.py
@@ -27,6 +27,7 @@
 
 
 class VolumesBackupsTest(base.BaseVolumeTest):
+    """Test volumes backup"""
 
     @classmethod
     def skip_checks(cls):
@@ -54,6 +55,16 @@
                       'ceph does not support arbitrary container names')
     @decorators.idempotent_id('a66eb488-8ee1-47d4-8e9f-575a095728c6')
     def test_volume_backup_create_get_detailed_list_restore_delete(self):
+        """Test create/get/list/restore/delete volume backup
+
+        1. Create volume1 with metadata
+        2. Create backup1 from volume1
+        3. Show backup1
+        4. List backups with detail
+        5. Restore backup1
+        6. Verify backup1 has been restored successfully with the metadata
+           of volume1
+        """
         # Create a volume with metadata
         metadata = {"vol-meta1": "value1",
                     "vol-meta2": "value2",
@@ -80,11 +91,7 @@
         self.assertEqual('container', backup['container'])
 
         # Get all backups with detail
-        backups = self.backups_client.list_backups(
-            detail=True)['backups']
-        for backup_info in backups:
-            self.assertIn('created_at', backup_info)
-            self.assertIn('links', backup_info)
+        backups = self.backups_client.list_backups(detail=True)['backups']
         self.assertIn((backup['name'], backup['id']),
                       [(m['name'], m['id']) for m in backups])
 
@@ -93,7 +100,7 @@
         restored_volume_metadata = self.volumes_client.show_volume(
             restored_volume['volume_id'])['volume']['metadata']
 
-        # Verify the backups has been restored successfully
+        # Verify the backup has been restored successfully
         # with the metadata of the source volume.
         self.assertThat(restored_volume_metadata.items(),
                         matchers.ContainsAll(metadata.items()))
@@ -124,6 +131,13 @@
     @decorators.idempotent_id('2a8ba340-dff2-4511-9db7-646f07156b15')
     @utils.services('image')
     def test_bootable_volume_backup_and_restore(self):
+        """Test backuping and restoring a bootable volume
+
+        1. Create volume1 from image
+        2. Create backup1 from volume1
+        3. Restore backup1
+        4. Verify the restored backup volume is bootable
+        """
         # Create volume from image
         img_uuid = CONF.compute.image_ref
         volume = self.create_volume(imageRef=img_uuid)
@@ -148,6 +162,7 @@
 
 
 class VolumesBackupsV39Test(base.BaseVolumeTest):
+    """Test volumes backup with volume microversion greater than 3.8"""
 
     _api_version = 3
     min_microversion = '3.9'
@@ -161,6 +176,7 @@
 
     @decorators.idempotent_id('9b374cbc-be5f-4d37-8848-7efb8a873dcc')
     def test_update_backup(self):
+        """Test updating backup's name and description"""
         # Create volume and backup
         volume = self.create_volume()
         backup = self.create_backup(volume_id=volume['id'])
@@ -176,7 +192,6 @@
             backup['id'], **update_kwargs)['backup']
         self.assertEqual(backup['id'], update_backup['id'])
         self.assertEqual(update_kwargs['name'], update_backup['name'])
-        self.assertIn('links', update_backup)
 
         # Assert response body for show_backup method
         retrieved_backup = self.backups_client.show_backup(
diff --git a/tempest/api/volume/test_volumes_get.py b/tempest/api/volume/test_volumes_get.py
index ade2deb..91728ab 100644
--- a/tempest/api/volume/test_volumes_get.py
+++ b/tempest/api/volume/test_volumes_get.py
@@ -37,11 +37,9 @@
         kwargs['name'] = v_name
         kwargs['metadata'] = metadata
         volume = self.volumes_client.create_volume(**kwargs)['volume']
-        self.assertIn('id', volume)
         self.addCleanup(self.delete_volume, self.volumes_client, volume['id'])
         waiters.wait_for_volume_resource_status(self.volumes_client,
                                                 volume['id'], 'available')
-        self.assertIn('name', volume)
         self.assertEqual(volume['name'], v_name,
                          "The created volume name is not equal "
                          "to the requested name")
@@ -101,7 +99,6 @@
                   'availability_zone': volume['availability_zone'],
                   'size': CONF.volume.volume_size}
         new_volume = self.volumes_client.create_volume(**params)['volume']
-        self.assertIn('id', new_volume)
         self.addCleanup(self.delete_volume, self.volumes_client,
                         new_volume['id'])
         waiters.wait_for_volume_resource_status(self.volumes_client,
@@ -153,7 +150,5 @@
     @decorators.idempotent_id('c4f2431e-4920-4736-9e00-4040386b6feb')
     def test_show_volume_summary(self):
         """Test showing volume summary"""
-        volume_summary = \
-            self.volumes_client.show_volume_summary()['volume-summary']
-        for key in ['total_size', 'total_count']:
-            self.assertIn(key, volume_summary)
+        # check response schema
+        self.volumes_client.show_volume_summary()
diff --git a/tempest/api/volume/test_volumes_list.py b/tempest/api/volume/test_volumes_list.py
index 2345698..60f85a4 100644
--- a/tempest/api/volume/test_volumes_list.py
+++ b/tempest/api/volume/test_volumes_list.py
@@ -26,11 +26,14 @@
 
 
 class VolumesListTestJSON(base.BaseVolumeTest):
-    # NOTE: This test creates a number of 1G volumes. To run it successfully,
-    # ensure that the backing file for the volume group that Cinder uses
-    # has space for at least 3 1G volumes!
-    # If you are running a Devstack environment, ensure that the
-    # VOLUME_BACKING_FILE_SIZE is at least 4G in your localrc
+    """Test listing volumes
+
+    NOTE: This test creates a number of 1G volumes. To run it successfully,
+    ensure that the backing file for the volume group that Cinder uses
+    has space for at least 3 1G volumes!
+    If you are running a Devstack environment, ensure that the
+    VOLUME_BACKING_FILE_SIZE is at least 4G in your localrc
+    """
 
     VOLUME_FIELDS = ('id', 'name')
 
@@ -116,7 +119,7 @@
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('0b6ddd39-b948-471f-8038-4787978747c4')
     def test_volume_list(self):
-        # Get a list of Volumes
+        """Test getting a list of volumes"""
         # Fetch all volumes
         fetched_list = self.volumes_client.list_volumes()['volumes']
         self._assert_volumes_in(fetched_list, self.volume_list,
@@ -124,13 +127,14 @@
 
     @decorators.idempotent_id('adcbb5a7-5ad8-4b61-bd10-5380e111a877')
     def test_volume_list_with_details(self):
-        # Get a list of Volumes with details
+        """Test getting a list of detailed volumes"""
         # Fetch all Volumes
         fetched_list = self.volumes_client.list_volumes(detail=True)['volumes']
         self._assert_volumes_in(fetched_list, self.volume_list)
 
     @decorators.idempotent_id('a28e8da4-0b56-472f-87a8-0f4d3f819c02')
     def test_volume_list_by_name(self):
+        """Test getting a list of volumes filtered by volume name"""
         volume = self.volume_list[data_utils.rand_int_id(0, 2)]
         params = {'name': volume['name']}
         fetched_vol = self.volumes_client.list_volumes(
@@ -140,6 +144,7 @@
 
     @decorators.idempotent_id('2de3a6d4-12aa-403b-a8f2-fdeb42a89623')
     def test_volume_list_details_by_name(self):
+        """Test getting a list of detailed volumes filtered by volume name"""
         volume = self.volume_list[data_utils.rand_int_id(0, 2)]
         params = {'name': volume['name']}
         fetched_vol = self.volumes_client.list_volumes(
@@ -149,6 +154,7 @@
 
     @decorators.idempotent_id('39654e13-734c-4dab-95ce-7613bf8407ce')
     def test_volumes_list_by_status(self):
+        """Test getting a list of volumes filtered by volume status"""
         params = {'status': 'available'}
         fetched_list = self.volumes_client.list_volumes(
             params=params)['volumes']
@@ -158,6 +164,7 @@
 
     @decorators.idempotent_id('2943f712-71ec-482a-bf49-d5ca06216b9f')
     def test_volumes_list_details_by_status(self):
+        """Test getting a list of detailed volumes filtered by status"""
         params = {'status': 'available'}
         fetched_list = self.volumes_client.list_volumes(
             detail=True, params=params)['volumes']
@@ -181,6 +188,7 @@
 
     @decorators.idempotent_id('2016a939-72ec-482a-bf49-d5ca06216b9f')
     def test_volumes_list_details_by_bootable(self):
+        """Test getting a list of detailed volumes filtered by bootable"""
         params = {'bootable': 'false'}
         fetched_list = self.volumes_client.list_volumes(
             detail=True, params=params)['volumes']
@@ -190,6 +198,7 @@
 
     @decorators.idempotent_id('c0cfa863-3020-40d7-b587-e35f597d5d87')
     def test_volumes_list_by_availability_zone(self):
+        """Test getting a list of volumes filtered by availability zone"""
         volume = self.volume_list[data_utils.rand_int_id(0, 2)]
         zone = volume['availability_zone']
         params = {'availability_zone': zone}
@@ -201,6 +210,7 @@
 
     @decorators.idempotent_id('e1b80d13-94f0-4ba2-a40e-386af29f8db1')
     def test_volumes_list_details_by_availability_zone(self):
+        """Test getting a list of detailed volumes by availability zone"""
         volume = self.volume_list[data_utils.rand_int_id(0, 2)]
         zone = volume['availability_zone']
         params = {'availability_zone': zone}
@@ -212,19 +222,19 @@
 
     @decorators.idempotent_id('b5ebea1b-0603-40a0-bb41-15fcd0a53214')
     def test_volume_list_with_param_metadata(self):
-        # Test to list volumes when metadata param is given
+        """Test listing volumes when metadata param is given"""
         params = {'metadata': self.metadata}
         self._list_by_param_value_and_assert(params)
 
     @decorators.idempotent_id('1ca92d3c-4a8e-4b43-93f5-e4c7fb3b291d')
     def test_volume_list_with_detail_param_metadata(self):
-        # Test to list volumes details when metadata param is given
+        """Test listing volumes details when metadata param is given"""
         params = {'metadata': self.metadata}
         self._list_by_param_value_and_assert(params, with_detail=True)
 
     @decorators.idempotent_id('777c87c1-2fc4-4883-8b8e-5c0b951d1ec8')
     def test_volume_list_param_display_name_and_status(self):
-        # Test to list volume when display name and status param is given
+        """Test listing volume when display name and status param is given"""
         volume = self.volume_list[data_utils.rand_int_id(0, 2)]
         params = {'name': volume['name'],
                   'status': 'available'}
@@ -232,7 +242,7 @@
 
     @decorators.idempotent_id('856ab8ca-6009-4c37-b691-be1065528ad4')
     def test_volume_list_with_detail_param_display_name_and_status(self):
-        # Test to list volume when name and status param is given
+        """Test listing volume when name and status param is given"""
         volume = self.volume_list[data_utils.rand_int_id(0, 2)]
         params = {'name': volume['name'],
                   'status': 'available'}
@@ -240,7 +250,7 @@
 
     @decorators.idempotent_id('2a7064eb-b9c3-429b-b888-33928fc5edd3')
     def test_volume_list_details_with_multiple_params(self):
-        # List volumes detail using combined condition
+        """Test listing volumes detail using combined filtering condition"""
         def _list_details_with_multiple_params(limit=2,
                                                status='available',
                                                sort_dir='asc',
@@ -375,14 +385,29 @@
 
     @decorators.idempotent_id('e9138a2c-f67b-4796-8efa-635c196d01de')
     def test_volume_list_details_pagination(self):
+        """Test listing volumes with details by pagination
+
+        All volumes will be returned by multiple requests, and the number of
+        'limit' volumes will be returned at a time.
+        """
         self._test_pagination('volumes', ids=self.volume_id_list, detail=True)
 
     @decorators.idempotent_id('af55e775-8e4b-4feb-8719-215c43b0238c')
     def test_volume_list_pagination(self):
+        """Test listing volumes by pagination
+
+        All volumes will be returned by multiple requests, and the number of
+        'limit' volumes will be returned at a time.
+        """
         self._test_pagination('volumes', ids=self.volume_id_list, detail=False)
 
     @decorators.idempotent_id('46eff077-100b-427f-914e-3db2abcdb7e2')
     def test_volume_list_with_detail_param_marker(self):
+        """Test listing volumes with details from the specified marker
+
+        Choose a volume id from all volumes as a marker, list volumes with
+        that marker, only volumes with id greater than marker will be returned.
+        """
         # Choosing a random volume from a list of volumes for 'marker'
         # parameter
         marker = random.choice(self.volume_id_list)
diff --git a/tempest/api/volume/test_volumes_negative.py b/tempest/api/volume/test_volumes_negative.py
index 866bd87..76c22f0 100644
--- a/tempest/api/volume/test_volumes_negative.py
+++ b/tempest/api/volume/test_volumes_negative.py
@@ -28,6 +28,7 @@
 
 
 class VolumesNegativeTest(base.BaseVolumeTest):
+    """Negative tests of volumes"""
 
     @classmethod
     def resource_setup(cls):
@@ -58,50 +59,49 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('f131c586-9448-44a4-a8b0-54ca838aa43e')
     def test_volume_get_nonexistent_volume_id(self):
-        # Should not be able to get a non-existent volume
+        """Test getting non existent volume should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.show_volume,
                           data_utils.rand_uuid())
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('555efa6e-efcd-44ef-8a3b-4a7ca4837a29')
     def test_volume_delete_nonexistent_volume_id(self):
-        # Should not be able to delete a non-existent Volume
+        """Test deleting non existent volume should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.delete_volume,
                           data_utils.rand_uuid())
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1ed83a8a-682d-4dfb-a30e-ee63ffd6c049')
     def test_create_volume_with_invalid_size(self):
-        # Should not be able to create volume with invalid size in request
+        """Test creating volume with invalid size should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.volumes_client.create_volume, size='#$%')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9387686f-334f-4d31-a439-33494b9e2683')
     def test_create_volume_without_passing_size(self):
-        # Should not be able to create volume without passing size
-        # in request
+        """Test creating volume with empty size should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.volumes_client.create_volume, size='')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('41331caa-eaf4-4001-869d-bc18c1869360')
     def test_create_volume_with_size_zero(self):
-        # Should not be able to create volume with size zero
+        """Test creating volume with zero size should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.volumes_client.create_volume, size='0')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8b472729-9eba-446e-a83b-916bdb34bef7')
     def test_create_volume_with_size_negative(self):
-        # Should not be able to create volume with size negative
+        """Test creating volume with negative size should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.volumes_client.create_volume, size='-1')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('10254ed8-3849-454e-862e-3ab8e6aa01d2')
     def test_create_volume_with_nonexistent_volume_type(self):
-        # Should not be able to create volume with non-existent volume type
+        """Test creating volume with non existent volume type should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.create_volume,
                           size=CONF.volume.volume_size,
                           volume_type=data_utils.rand_uuid())
@@ -109,7 +109,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0c36f6ae-4604-4017-b0a9-34fdc63096f9')
     def test_create_volume_with_nonexistent_snapshot_id(self):
-        # Should not be able to create volume with non-existent snapshot
+        """Test creating volume with non existent snapshot should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.create_volume,
                           size=CONF.volume.volume_size,
                           snapshot_id=data_utils.rand_uuid())
@@ -117,7 +117,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('47c73e08-4be8-45bb-bfdf-0c4e79b88344')
     def test_create_volume_with_nonexistent_source_volid(self):
-        # Should not be able to create volume with non-existent source volume
+        """Test creating volume with non existent source volume should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.create_volume,
                           size=CONF.volume.volume_size,
                           source_volid=data_utils.rand_uuid())
@@ -125,46 +125,49 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0186422c-999a-480e-a026-6a665744c30c')
     def test_update_volume_with_nonexistent_volume_id(self):
+        """Test updating non existent volume should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.update_volume,
                           volume_id=data_utils.rand_uuid())
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e66e40d6-65e6-4e75-bdc7-636792fa152d')
     def test_update_volume_with_invalid_volume_id(self):
+        """Test updating volume with invalid volume id should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.update_volume,
                           volume_id=data_utils.rand_name('invalid'))
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('72aeca85-57a5-4c1f-9057-f320f9ea575b')
     def test_update_volume_with_empty_volume_id(self):
+        """Test updating volume with empty volume id should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.update_volume,
                           volume_id='')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('30799cfd-7ee4-446c-b66c-45b383ed211b')
     def test_get_invalid_volume_id(self):
-        # Should not be able to get volume with invalid id
+        """Test getting volume with invalid volume id should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.show_volume,
                           data_utils.rand_name('invalid'))
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('c6c3db06-29ad-4e91-beb0-2ab195fe49e3')
     def test_get_volume_without_passing_volume_id(self):
-        # Should not be able to get volume when empty ID is passed
+        """Test getting volume with empty volume id should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.volumes_client.show_volume, '')
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('1f035827-7c32-4019-9240-b4ec2dbd9dfd')
     def test_delete_invalid_volume_id(self):
-        # Should not be able to delete volume when invalid ID is passed
+        """Test deleting volume with invalid volume id should fail"""
         self.assertRaises(lib_exc.NotFound, self.volumes_client.delete_volume,
                           data_utils.rand_name('invalid'))
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('441a1550-5d44-4b30-af0f-a6d402f52026')
     def test_delete_volume_without_passing_volume_id(self):
-        # Should not be able to delete volume when empty ID is passed
+        """Test deleting volume with empty volume id should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.volumes_client.delete_volume, '')
 
@@ -172,6 +175,7 @@
     @decorators.idempotent_id('f5e56b0a-5d02-43c1-a2a7-c9b792c2e3f6')
     @utils.services('compute')
     def test_attach_volumes_with_nonexistent_volume_id(self):
+        """Test attaching non existent volume to server should fail"""
         server = self.create_server()
 
         self.assertRaises(lib_exc.NotFound,
@@ -183,6 +187,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9f9c24e4-011d-46b5-b992-952140ce237a')
     def test_detach_volumes_with_invalid_volume_id(self):
+        """Test detaching volume with invalid volume id should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.volumes_client.detach_volume,
                           'xxx')
@@ -190,7 +195,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e0c75c74-ee34-41a9-9288-2a2051452854')
     def test_volume_extend_with_size_smaller_than_original_size(self):
-        # Extend volume with smaller size than original size.
+        """Test extending volume with decreasing size should fail"""
         extend_size = 0
         self.assertRaises(lib_exc.BadRequest,
                           self.volumes_client.extend_volume,
@@ -199,7 +204,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('5d0b480d-e833-439f-8a5a-96ad2ed6f22f')
     def test_volume_extend_with_non_number_size(self):
-        # Extend volume when size is non number.
+        """Test extending volume with non-integer size should fail"""
         extend_size = 'abc'
         self.assertRaises(lib_exc.BadRequest,
                           self.volumes_client.extend_volume,
@@ -208,7 +213,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('355218f1-8991-400a-a6bb-971239287d92')
     def test_volume_extend_with_None_size(self):
-        # Extend volume with None size.
+        """Test extending volume with none size should fail"""
         extend_size = None
         self.assertRaises(lib_exc.BadRequest,
                           self.volumes_client.extend_volume,
@@ -217,7 +222,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8f05a943-013c-4063-ac71-7baf561e82eb')
     def test_volume_extend_with_nonexistent_volume_id(self):
-        # Extend volume size when volume is nonexistent.
+        """Test extending non existent volume should fail"""
         extend_size = self.volume['size'] + 1
         self.assertRaises(lib_exc.NotFound, self.volumes_client.extend_volume,
                           data_utils.rand_uuid(), new_size=extend_size)
@@ -225,7 +230,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('aff8ba64-6d6f-4f2e-bc33-41a08ee9f115')
     def test_volume_extend_without_passing_volume_id(self):
-        # Extend volume size when passing volume id is None.
+        """Test extending volume without passing volume id should fail"""
         extend_size = self.volume['size'] + 1
         self.assertRaises(lib_exc.NotFound, self.volumes_client.extend_volume,
                           None, new_size=extend_size)
@@ -233,6 +238,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ac6084c0-0546-45f9-b284-38a367e0e0e2')
     def test_reserve_volume_with_nonexistent_volume_id(self):
+        """Test reserving non existent volume should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.volumes_client.reserve_volume,
                           data_utils.rand_uuid())
@@ -240,6 +246,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('eb467654-3dc1-4a72-9b46-47c29d22654c')
     def test_unreserve_volume_with_nonexistent_volume_id(self):
+        """Test unreserving non existent volume should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.volumes_client.unreserve_volume,
                           data_utils.rand_uuid())
@@ -247,6 +254,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('449c4ed2-ecdd-47bb-98dc-072aeccf158c')
     def test_reserve_volume_with_negative_volume_status(self):
+        """Test reserving already reserved volume should fail"""
         # Mark volume as reserved.
         self.volumes_client.reserve_volume(self.volume['id'])
         # Mark volume which is marked as reserved before
@@ -259,6 +267,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('0f4aa809-8c7b-418f-8fb3-84c7a5dfc52f')
     def test_list_volumes_with_nonexistent_name(self):
+        """Test listing volumes with non existent name should get nothing"""
         v_name = data_utils.rand_name(self.__class__.__name__ + '-Volume')
         params = {'name': v_name}
         fetched_volume = self.volumes_client.list_volumes(
@@ -268,6 +277,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('9ca17820-a0e7-4cbd-a7fa-f4468735e359')
     def test_list_volumes_detail_with_nonexistent_name(self):
+        """Test listing volume details with non existent name
+
+        Listing volume details with non existent name should get nothing.
+        """
         v_name = data_utils.rand_name(self.__class__.__name__ + '-Volume')
         params = {'name': v_name}
         fetched_volume = \
@@ -278,6 +291,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('143b279b-7522-466b-81be-34a87d564a7c')
     def test_list_volumes_with_invalid_status(self):
+        """Test listing volumes with invalid status should get nothing"""
         params = {'status': 'null'}
         fetched_volume = self.volumes_client.list_volumes(
             params=params)['volumes']
@@ -286,6 +300,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('ba94b27b-be3f-496c-a00e-0283b373fa75')
     def test_list_volumes_detail_with_invalid_status(self):
+        """Test listing volume details with invalid status
+
+        Listing volume details with invalid status should get nothing
+        """
         params = {'status': 'null'}
         fetched_volume = \
             self.volumes_client.list_volumes(detail=True,
@@ -296,6 +314,7 @@
     @decorators.idempotent_id('5b810c91-0ad1-47ce-aee8-615f789be78f')
     @utils.services('image')
     def test_create_volume_from_image_with_decreasing_size(self):
+        """Test creating volume from image with decreasing size should fail"""
         # Create image
         image = self.create_image()
 
@@ -311,6 +330,7 @@
     @decorators.idempotent_id('d15e7f35-2cfc-48c8-9418-c8223a89bcbb')
     @utils.services('image')
     def test_create_volume_from_deactivated_image(self):
+        """Test creating volume from deactivated image should fail"""
         # Create image
         image = self.create_image()
 
diff --git a/tempest/api/volume/test_volumes_snapshots.py b/tempest/api/volume/test_volumes_snapshots.py
index bf221e8..fd2e7c4 100644
--- a/tempest/api/volume/test_volumes_snapshots.py
+++ b/tempest/api/volume/test_volumes_snapshots.py
@@ -25,6 +25,8 @@
 
 
 class VolumesSnapshotTestJSON(base.BaseVolumeTest):
+    """Test volume snapshots"""
+
     create_default_network = True
 
     @classmethod
@@ -41,6 +43,7 @@
     @decorators.idempotent_id('8567b54c-4455-446d-a1cf-651ddeaa3ff2')
     @utils.services('compute')
     def test_snapshot_create_delete_with_volume_in_use(self):
+        """Test create/delete snapshot from volume attached to server"""
         # Create a test instance
         server = self.create_server()
         # NOTE(zhufl) Here we create volume from self.image_ref for adding
@@ -66,7 +69,13 @@
     @decorators.idempotent_id('5210a1de-85a0-11e6-bb21-641c676a5d61')
     @utils.services('compute')
     def test_snapshot_create_offline_delete_online(self):
+        """Test creating snapshots when volume is detached and attached
 
+        1. Create snapshot1 from volume1(not attached to any server)
+        2. Attach volume1 to server1
+        3. Create snapshot2 and snapshot3 from volume1
+        4. Delete snapshot3, snapshot1, snapshot2
+        """
         # Create a snapshot while it is not attached
         snapshot1 = self.create_snapshot(self.volume_origin['id'])
 
@@ -74,7 +83,7 @@
         server = self.create_server()
         self.attach_volume(server['id'], self.volume_origin['id'])
 
-        # Now that the volume is attached, create another snapshots
+        # Now that the volume is attached, create other snapshots
         snapshot2 = self.create_snapshot(self.volume_origin['id'], force=True)
         snapshot3 = self.create_snapshot(self.volume_origin['id'], force=True)
 
@@ -86,6 +95,7 @@
 
     @decorators.idempotent_id('2a8abbe4-d871-46db-b049-c41f5af8216e')
     def test_snapshot_create_get_list_update_delete(self):
+        """Test create/get/list/update/delete snapshot"""
         # Create a snapshot with metadata
         metadata = {"snap-meta1": "value1",
                     "snap-meta2": "value2",
@@ -156,19 +166,25 @@
 
     @decorators.idempotent_id('677863d1-3142-456d-b6ac-9924f667a7f4')
     def test_volume_from_snapshot(self):
-        # Creates a volume from a snapshot passing a size
-        # different from the source
+        """Test creating volume from snapshot with extending size"""
         self._create_volume_from_snapshot(extra_size=1)
 
     @decorators.idempotent_id('053d8870-8282-4fff-9dbb-99cb58bb5e0a')
     def test_volume_from_snapshot_no_size(self):
-        # Creates a volume from a snapshot defaulting to original size
+        """Test creating volume from snapshot with original size"""
         self._create_volume_from_snapshot()
 
     @decorators.idempotent_id('bbcfa285-af7f-479e-8c1a-8c34fc16543c')
     @testtools.skipUnless(CONF.volume_feature_enabled.backup,
                           "Cinder backup is disabled")
     def test_snapshot_backup(self):
+        """Test creating backup from snapshot and volume
+
+        1. Create snapshot1 from volume1
+        2. Create backup from volume1 and snapshot1
+        3. Check the created backup's volume is volume1 and snapshot
+           is snapshot1
+        """
         # Create a snapshot
         snapshot = self.create_snapshot(volume_id=self.volume_origin['id'])
 
diff --git a/tempest/api/volume/test_volumes_snapshots_list.py b/tempest/api/volume/test_volumes_snapshots_list.py
index f4f039c..77627bc 100644
--- a/tempest/api/volume/test_volumes_snapshots_list.py
+++ b/tempest/api/volume/test_volumes_snapshots_list.py
@@ -18,6 +18,7 @@
 
 
 class VolumesSnapshotListTestJSON(base.BaseVolumeTest):
+    """Test listing volume snapshots"""
 
     @classmethod
     def skip_checks(cls):
@@ -50,6 +51,7 @@
 
     def _list_snapshots_by_param_limit(self, limit, expected_elements):
         """list snapshots by limit param"""
+
         # Get snapshots list using limit parameter
         fetched_snap_list = self.snapshots_client.list_snapshots(
             limit=limit)['snapshots']
@@ -58,7 +60,8 @@
 
     @decorators.idempotent_id('59f41f43-aebf-48a9-ab5d-d76340fab32b')
     def test_snapshots_list_with_params(self):
-        """list snapshots with params."""
+        """Test listing snapshots with params"""
+
         # Verify list snapshots by display_name filter
         params = {'name': self.snapshot['name']}
         self._list_by_param_values_and_assert(**params)
@@ -74,7 +77,8 @@
 
     @decorators.idempotent_id('220a1022-1fcd-4a74-a7bd-6b859156cda2')
     def test_snapshots_list_details_with_params(self):
-        """list snapshot details with params."""
+        """Test listing snapshot details with params"""
+
         # Verify list snapshot details by display_name filter
         params = {'name': self.snapshot['name']}
         self._list_by_param_values_and_assert(with_detail=True, **params)
@@ -88,24 +92,29 @@
 
     @decorators.idempotent_id('db4d8e0a-7a2e-41cc-a712-961f6844e896')
     def test_snapshot_list_param_limit(self):
-        # List returns limited elements
+        """Test listing snapshot with limit returns the limited elements
+
+        If listing snapshots with limit=1, then 1 snapshot is returned.
+        """
         self._list_snapshots_by_param_limit(limit=1, expected_elements=1)
 
     @decorators.idempotent_id('a1427f61-420e-48a5-b6e3-0b394fa95400')
     def test_snapshot_list_param_limit_equals_infinite(self):
-        # List returns all elements when request limit exceeded
-        # snapshots number
+        """Test listing snapshot with infinite limit
+
+        If listing snapshots with limit greater than the count of all
+        snapshots, then all snapshots are returned.
+        """
         snap_list = self.snapshots_client.list_snapshots()['snapshots']
         self._list_snapshots_by_param_limit(limit=100000,
                                             expected_elements=len(snap_list))
 
     @decorators.idempotent_id('e3b44b7f-ae87-45b5-8a8c-66110eb24d0a')
     def test_snapshot_list_param_limit_equals_zero(self):
-        # List returns zero elements
+        """Test listing snapshot with zero limit should return empty list"""
         self._list_snapshots_by_param_limit(limit=0, expected_elements=0)
 
     def _list_snapshots_param_sort(self, sort_key, sort_dir):
-        """list snapshots by sort param"""
         snap_list = self.snapshots_client.list_snapshots(
             sort_key=sort_key, sort_dir=sort_dir)['snapshots']
         self.assertNotEmpty(snap_list)
@@ -122,33 +131,42 @@
 
     @decorators.idempotent_id('c5513ada-64c1-4d28-83b9-af3307ec1388')
     def test_snapshot_list_param_sort_id_asc(self):
+        """Test listing snapshots sort by id ascendingly"""
         self._list_snapshots_param_sort(sort_key='id', sort_dir='asc')
 
     @decorators.idempotent_id('8a7fe058-0b41-402a-8afd-2dbc5a4a718b')
     def test_snapshot_list_param_sort_id_desc(self):
+        """Test listing snapshots sort by id descendingly"""
         self._list_snapshots_param_sort(sort_key='id', sort_dir='desc')
 
     @decorators.idempotent_id('4052c3a0-2415-440a-a8cc-305a875331b0')
     def test_snapshot_list_param_sort_created_at_asc(self):
+        """Test listing snapshots sort by created_at ascendingly"""
         self._list_snapshots_param_sort(sort_key='created_at', sort_dir='asc')
 
     @decorators.idempotent_id('dcbbe24a-f3c0-4ec8-9274-55d48db8d1cf')
     def test_snapshot_list_param_sort_created_at_desc(self):
+        """Test listing snapshots sort by created_at descendingly"""
         self._list_snapshots_param_sort(sort_key='created_at', sort_dir='desc')
 
     @decorators.idempotent_id('d58b5fed-0c37-42d3-8c5d-39014ac13c00')
     def test_snapshot_list_param_sort_name_asc(self):
+        """Test listing snapshots sort by display_name ascendingly"""
         self._list_snapshots_param_sort(sort_key='display_name',
                                         sort_dir='asc')
 
     @decorators.idempotent_id('96ba6f4d-1f18-47e1-b4bc-76edc6c21250')
     def test_snapshot_list_param_sort_name_desc(self):
+        """Test listing snapshots sort by display_name descendingly"""
         self._list_snapshots_param_sort(sort_key='display_name',
                                         sort_dir='desc')
 
     @decorators.idempotent_id('05489dde-44bc-4961-a1f5-3ce7ee7824f7')
     def test_snapshot_list_param_marker(self):
-        # The list of snapshots should end before the provided marker
+        """Test listing snapshots with marker
+
+        The list of snapshots should end before the provided marker
+        """
         snap_list = self.snapshots_client.list_snapshots()['snapshots']
         # list_snapshots will take the reverse order as they are created.
         snapshot_id_list = [snap['id'] for snap in snap_list][::-1]
@@ -163,6 +181,13 @@
 
     @decorators.idempotent_id('ca96d551-17c6-4e11-b0e8-52d3bb8a63c7')
     def test_snapshot_list_param_offset(self):
+        """Test listing snapshots with offset and limit
+
+        If listing snapshots with offset=2 and limit=3, then at most 3(limit)
+        snapshots located in the position 2(offset) in the all snapshots list
+        should be returned.
+        (The items in the all snapshots list start from position 0.)
+        """
         params = {'offset': 2, 'limit': 3}
         snap_list = self.snapshots_client.list_snapshots(**params)['snapshots']
         # Verify the list of snapshots skip offset=2 from the first element
diff --git a/tempest/api/volume/test_volumes_snapshots_negative.py b/tempest/api/volume/test_volumes_snapshots_negative.py
index 0453c0a..9c36dc6 100644
--- a/tempest/api/volume/test_volumes_snapshots_negative.py
+++ b/tempest/api/volume/test_volumes_snapshots_negative.py
@@ -20,6 +20,7 @@
 
 
 class VolumesSnapshotNegativeTestJSON(base.BaseVolumeTest):
+    """Negative tests of volume snapshot"""
 
     @classmethod
     def skip_checks(cls):
@@ -30,7 +31,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('e3e466af-70ab-4f4b-a967-ab04e3532ea7')
     def test_create_snapshot_with_nonexistent_volume_id(self):
-        # Create a snapshot with nonexistent volume id
+        """Test creating snapshot from non existent volume should fail"""
         s_name = data_utils.rand_name(self.__class__.__name__ + '-snap')
         self.assertRaises(lib_exc.NotFound,
                           self.snapshots_client.create_snapshot,
@@ -40,6 +41,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('bb9da53e-d335-4309-9c15-7e76fd5e4d6d')
     def test_create_snapshot_without_passing_volume_id(self):
+        """Test creating snapshot without passing volume_id should fail"""
         # Create a snapshot without passing volume id
         s_name = data_utils.rand_name(self.__class__.__name__ + '-snap')
         self.assertRaises(lib_exc.NotFound,
@@ -49,6 +51,10 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('677863d1-34f9-456d-b6ac-9924f667a7f4')
     def test_volume_from_snapshot_decreasing_size(self):
+        """Test creating volume from snapshot with decreasing size
+
+        creating volume from snapshot with decreasing size should fail.
+        """
         # Creates a volume a snapshot passing a size different from the source
         src_size = CONF.volume.volume_size * 2
 
@@ -64,6 +70,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8fd92339-e22f-4591-86b4-1e2215372a40')
     def test_list_snapshot_invalid_param_limit(self):
+        """Test listing snapshots with invalid limit param should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.snapshots_client.list_snapshots,
                           limit='invalid')
@@ -71,6 +78,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('27b5f37f-bf69-4e8c-986e-c44f3d6819b8')
     def test_list_snapshots_invalid_param_sort(self):
+        """Test listing snapshots with invalid sort key should fail"""
         self.assertRaises(lib_exc.BadRequest,
                           self.snapshots_client.list_snapshots,
                           sort_key='invalid')
@@ -78,6 +86,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('b68deeda-ca79-4a32-81af-5c51179e553a')
     def test_list_snapshots_invalid_param_marker(self):
+        """Test listing snapshots with invalid marker should fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.snapshots_client.list_snapshots,
                           marker=data_utils.rand_uuid())
diff --git a/tempest/cmd/account_generator.py b/tempest/cmd/account_generator.py
index b230615..ff552a1 100755
--- a/tempest/cmd/account_generator.py
+++ b/tempest/cmd/account_generator.py
@@ -97,6 +97,7 @@
 [OPTIONS] <accounts_file.yaml> -h``.
 """
 
+import argparse
 import os
 import traceback
 
@@ -199,6 +200,14 @@
     LOG.info('%s generated successfully!', account_file)
 
 
+def positive_int(number):
+    number = int(number)
+    if number <= 0:
+        raise argparse.ArgumentTypeError("Concurrency value should be a "
+                                         "positive number")
+    return number
+
+
 def _parser_add_args(parser):
     parser.add_argument('-c', '--config-file',
                         metavar='/etc/tempest.conf',
@@ -228,7 +237,7 @@
                         help='Resources tag')
     parser.add_argument('-r', '--concurrency',
                         default=1,
-                        type=int,
+                        type=positive_int,
                         required=False,
                         dest='concurrency',
                         help='Concurrency count')
diff --git a/tempest/cmd/init.py b/tempest/cmd/init.py
index d84f3a3..6e93d69 100644
--- a/tempest/cmd/init.py
+++ b/tempest/cmd/init.py
@@ -44,11 +44,14 @@
 
     :return: default config dir
     """
+    # NOTE: The default directory should be on a Linux box.
     global_conf_dir = '/etc/tempest'
     xdg_config = os.environ.get('XDG_CONFIG_HOME',
-                                os.path.expanduser('~/.config'))
+                                os.path.expanduser(os.path.join('~',
+                                                                '.config')))
     user_xdg_global_path = os.path.join(xdg_config, 'tempest')
-    user_global_path = os.path.join(os.path.expanduser('~'), '.tempest/etc')
+    user_global_path = os.path.join(os.path.expanduser('~'),
+                                    '.tempest', 'etc')
     if os.path.isdir(global_conf_dir):
         return global_conf_dir
     elif os.path.isdir(user_xdg_global_path):
@@ -121,7 +124,7 @@
     def generate_sample_config(self, local_dir):
         conf_generator = os.path.join(os.path.dirname(__file__),
                                       'config-generator.tempest.conf')
-        output_file = os.path.join(local_dir, 'etc/tempest.conf.sample')
+        output_file = os.path.join(local_dir, 'etc', 'tempest.conf.sample')
         if os.path.isfile(conf_generator):
             generator.main(['--config-file', conf_generator, '--output-file',
                             output_file])
diff --git a/tempest/cmd/subunit_describe_calls.py b/tempest/cmd/subunit_describe_calls.py
index e029538..172fbaa 100644
--- a/tempest/cmd/subunit_describe_calls.py
+++ b/tempest/cmd/subunit_describe_calls.py
@@ -30,6 +30,8 @@
 * ``--ports, -p``: (Optional) The path to a JSON file describing the ports
   being used by different services
 * ``--verbose, -v``: (Optional) Print Request and Response Headers and Body
+  data to stdout in the non cliff deprecated CLI
+* ``--all-stdout, -a``: (Optional) Print Request and Response Headers and Body
   data to stdout
 
 
@@ -278,7 +280,7 @@
     return url_parser
 
 
-def output(url_parser, output_file, verbose):
+def output(url_parser, output_file, all_stdout):
     if output_file is not None:
         with open(output_file, "w") as outfile:
             outfile.write(json.dumps(url_parser.test_logs))
@@ -294,7 +296,7 @@
             sys.stdout.write('\t- {0} {1} request for {2} to {3}\n'.format(
                 item.get('status_code'), item.get('verb'),
                 item.get('service'), item.get('url')))
-            if verbose:
+            if all_stdout:
                 sys.stdout.write('\t\t- request headers: {0}\n'.format(
                     item.get('request_headers')))
                 sys.stdout.write('\t\t- request body: {0}\n'.format(
@@ -313,7 +315,7 @@
               "please use: 'tempest subunit-describe-calls'")
         cl_args = ArgumentParser().parse_args()
     parser = parse(cl_args.subunit, cl_args.non_subunit_name, cl_args.ports)
-    output(parser, cl_args.output_file, cl_args.verbose)
+    output(parser, cl_args.output_file, cl_args.all_stdout)
 
 
 def _parser_add_args(parser):
@@ -339,9 +341,23 @@
         help="A JSON file describing the ports for each service."
     )
 
-    parser.add_argument(
-        "-v", "--verbose", action='store_true', default=False,
-        help="Add Request and Response header and body data to stdout."
+    group = parser.add_mutually_exclusive_group()
+    # the -v and --verbose command are for the old subunit-describe-calls
+    # main() CLI interface.  It does not work with the new
+    # tempest subunit-describe-callss CLI. So when the main CLI approach is
+    # deleted this argument is not needed.
+    group.add_argument(
+        "-v", "--verbose", action='store_true', dest='all_stdout',
+        help='Add Request and Response header and body data to stdout print.'
+             ' NOTE: This argument deprecated and does not work with'
+             ' tempest subunit-describe-calls CLI.'
+             ' Use new option: "-a", "--all-stdout"'
+    )
+    group.add_argument(
+        "-a", "--all-stdout", action='store_true',
+        help="Add Request and Response header and body data to stdout print."
+             " Note: this argument work with the subunit-describe-calls and"
+             " tempest subunit-describe-calls CLI commands."
     )
 
 
diff --git a/tempest/common/custom_matchers.py b/tempest/common/custom_matchers.py
index c702d88..b0bf5b2 100644
--- a/tempest/common/custom_matchers.py
+++ b/tempest/common/custom_matchers.py
@@ -62,8 +62,9 @@
         # [1] https://bugs.launchpad.net/swift/+bug/1537811
         # [2] http://tracker.ceph.com/issues/13582
         if ('content-length' not in actual and
+                'transfer-encoding' not in actual and
                 self._content_length_required(actual)):
-            return NonExistentHeader('content-length')
+            return NonExistentHeaders(['content-length', 'transfer-encoding'])
         if 'content-type' not in actual:
             return NonExistentHeader('content-type')
         if 'x-trans-id' not in actual:
@@ -75,8 +76,6 @@
         if self.method == 'GET' or self.method == 'HEAD':
             if 'x-timestamp' not in actual:
                 return NonExistentHeader('x-timestamp')
-            if 'accept-ranges' not in actual:
-                return NonExistentHeader('accept-ranges')
             if self.target == 'Account':
                 if 'x-account-bytes-used' not in actual:
                     return NonExistentHeader('x-account-bytes-used')
@@ -192,6 +191,19 @@
         return {}
 
 
+class NonExistentHeaders(object):
+    """Informs an error message in the case of missing certain headers"""
+
+    def __init__(self, headers):
+        self.headers = headers
+
+    def describe(self):
+        return "none of these headers exist: %s" % self.headers
+
+    def get_details(self):
+        return {}
+
+
 class InvalidHeaderValue(object):
     """Informs an error message when a header contains a bad value"""
 
diff --git a/tempest/common/waiters.py b/tempest/common/waiters.py
index 14790d6..fc25914 100644
--- a/tempest/common/waiters.py
+++ b/tempest/common/waiters.py
@@ -223,6 +223,25 @@
              resource_name, resource_id, status, time.time() - start)
 
 
+def wait_for_volume_attachment_create(client, volume_id, server_id):
+    """Waits for a volume attachment to be created at a given volume."""
+    start = int(time.time())
+    while True:
+        attachments = client.show_volume(volume_id)['volume']['attachments']
+        found = [a for a in attachments if a['server_id'] == server_id]
+        if found:
+            LOG.info('Attachment %s created for volume %s to server %s after '
+                     'waiting for %f seconds', found[0]['attachment_id'],
+                     volume_id, server_id, time.time() - start)
+            return found[0]
+        time.sleep(client.build_interval)
+        if int(time.time()) - start >= client.build_timeout:
+            message = ('Failed to attach volume %s to server %s '
+                       'within the required time (%s s).' %
+                       (volume_id, server_id, client.build_timeout))
+            raise lib_exc.TimeoutException(message)
+
+
 def wait_for_volume_attachment_remove(client, volume_id, attachment_id):
     """Waits for a volume attachment to be removed from a given volume."""
     start = int(time.time())
diff --git a/tempest/config.py b/tempest/config.py
index e4e17f1..a632dee 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -13,8 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import print_function
-
 import os
 import tempfile
 
@@ -483,6 +481,12 @@
                                   'MIN_LIBVIRT_VERSION is >= 1.2.17 on all '
                                   'branches from stable/rocky and will be '
                                   'removed in a future release.'),
+    cfg.BoolOpt('can_migrate_between_any_hosts',
+                default=True,
+                help="Does the test environment support migrating between "
+                     "any hosts? In environments with non-homogeneous compute "
+                     "nodes you can set this to False so that it will select "
+                     "destination host for migrating automatically"),
     cfg.BoolOpt('vnc_console',
                 default=False,
                 help='Enable VNC console. This configuration value should '
@@ -594,6 +598,18 @@
                 help='Does the test environment support attaching a volume to '
                      'more than one instance? This depends on hypervisor and '
                      'volume backend/type and compute API version 2.60.'),
+    cfg.BoolOpt('xenapi_apis',
+                default=False,
+                help='Does the test environment support the XenAPI-specific '
+                     'APIs: os-agents, writeable server metadata and the '
+                     'resetNetwork server action? '
+                     'These were removed in Victoria alongside the XenAPI '
+                     'virt driver.',
+                deprecated_for_removal=True,
+                deprecated_reason="On Nova side, XenAPI virt driver and the "
+                                  "APIs that only worked with that driver "
+                                  "have been removed and there's nothing to "
+                                  "test after Ussuri."),
 ]
 
 
@@ -658,6 +674,12 @@
                                   'are current one. In future, Tempest will '
                                   'test v2 APIs only so this config option '
                                   'will be removed.'),
+    # Image import feature is setup in devstack victoria onwards.
+    # Once all stable branches setup the same via glance standalone
+    # mode or with uwsgi, we can remove this config option.
+    cfg.BoolOpt('import_image',
+                default=False,
+                help="Is image import feature enabled"),
 ]
 
 network_group = cfg.OptGroup(name='network',
@@ -1068,11 +1090,13 @@
     cfg.StrOpt('img_dir',
                default='/opt/stack/new/devstack/files/images/'
                'cirros-0.3.1-x86_64-uec',
-               help='Directory containing image files',
+               help='Directory containing image files, this has been '
+                    'deprecated - img_file option contains a full path now.',
                deprecated_for_removal=True),
     cfg.StrOpt('img_file', deprecated_name='qcow2_img_file',
-               default='cirros-0.3.1-x86_64-disk.img',
-               help='Image file name'),
+               default='/opt/stack/new/devstack/files/images'
+               '/cirros-0.3.1-x86_64-disk.img',
+               help='Image full path.'),
     cfg.StrOpt('img_disk_format',
                default='qcow2',
                help='Image disk format'),
@@ -1081,18 +1105,6 @@
                help='Image container format'),
     cfg.DictOpt('img_properties', help='Glance image properties. '
                 'Use for custom images which require them'),
-    cfg.StrOpt('ami_img_file',
-               default='cirros-0.3.1-x86_64-blank.img',
-               help='AMI image file name',
-               deprecated_for_removal=True),
-    cfg.StrOpt('ari_img_file',
-               default='cirros-0.3.1-x86_64-initrd',
-               help='ARI image file name',
-               deprecated_for_removal=True),
-    cfg.StrOpt('aki_img_file',
-               default='cirros-0.3.1-x86_64-vmlinuz',
-               help='AKI image file name',
-               deprecated_for_removal=True),
     # TODO(yfried): add support for dhcpcd
     cfg.StrOpt('dhcp_client',
                default='udhcpc',
diff --git a/tempest/lib/api_schema/response/compute/v2_1/parameter_types.py b/tempest/lib/api_schema/response/compute/v2_1/parameter_types.py
index 28ed816..8aed37d 100644
--- a/tempest/lib/api_schema/response/compute/v2_1/parameter_types.py
+++ b/tempest/lib/api_schema/response/compute/v2_1/parameter_types.py
@@ -120,3 +120,10 @@
     # 7: SUSPENDED
     'enum': [0, 1, 3, 4, 6, 7]
 }
+
+uuid_or_null = {
+    'anyOf': [
+        {'type': 'string', 'format': 'uuid'},
+        {'type': 'null'}
+    ]
+}
diff --git a/tempest/lib/api_schema/response/volume/backups.py b/tempest/lib/api_schema/response/volume/backups.py
new file mode 100644
index 0000000..cba7981
--- /dev/null
+++ b/tempest/lib/api_schema/response/volume/backups.py
@@ -0,0 +1,229 @@
+# Copyright 2015 NEC Corporation.  All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import copy
+
+from tempest.lib.api_schema.response.compute.v2_1 import parameter_types
+
+common_show_backup = {
+    'type': 'object',
+    'properties': {
+        'status': {'type': 'string'},
+        'object_count': {'type': 'integer'},
+        'container': {'type': ['string', 'null']},
+        'description': {'type': ['string', 'null']},
+        'links': parameter_types.links,
+        'availability_zone': {'type': ['string', 'null']},
+        'created_at': parameter_types.date_time,
+        'updated_at': parameter_types.date_time_or_null,
+        'name': {'type': ['string', 'null']},
+        'has_dependent_backups': {'type': 'boolean'},
+        'volume_id': {'type': 'string', 'format': 'uuid'},
+        'fail_reason': {'type': ['string', 'null']},
+        'size': {'type': 'integer'},
+        'id': {'type': 'string', 'format': 'uuid'},
+        'is_incremental': {'type': 'boolean'},
+        'data_timestamp': parameter_types.date_time_or_null,
+        'snapshot_id': {'type': ['string', 'null']},
+        # TODO(zhufl): os-backup-project-attr:project_id is added
+        # in 3.18, we should move it to the 3.18 schema file when
+        # microversion is supported in volume interfaces.
+        'os-backup-project-attr:project_id': {
+            'type': 'string', 'format': 'uuid'},
+        # TODO(zhufl): metadata is added in 3.43, we should move it
+        # to the 3.43 schema file when microversion is supported
+        # in volume interfaces.
+        'metadata': {'^.+$': {'type': 'string'}},
+        # TODO(zhufl): user_id is added in 3.56, we should move it
+        # to the 3.56 schema file when microversion is supported
+        # in volume interfaces.
+        'user_id': {'type': 'string'},
+    },
+    'additionalProperties': False,
+    'required': ['status', 'object_count', 'fail_reason', 'links',
+                 'created_at', 'updated_at', 'name', 'volume_id', 'size', 'id',
+                 'data_timestamp']
+}
+
+create_backup = {
+    'status_code': [202],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'backup': {
+                'type': 'object',
+                'properties': {
+                    'id': {'type': 'string', 'format': 'uuid'},
+                    'links': parameter_types.links,
+                    'name': {'type': ['string', 'null']},
+                    # TODO(zhufl): metadata is added in 3.43, we should move it
+                    # to the 3.43 schema file when microversion is supported
+                    # in volume interfaces.
+                    'metadata': {'^.+$': {'type': 'string'}},
+                },
+                'additionalProperties': False,
+                'required': ['id', 'links', 'name']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['backup']
+    }
+}
+
+update_backup = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'backup': {
+                'type': 'object',
+                'properties': {
+                    'id': {'type': 'string', 'format': 'uuid'},
+                    'links': parameter_types.links,
+                    'name': {'type': ['string', 'null']},
+                    'metadata': {'^.+$': {'type': 'string'}}
+                },
+                'additionalProperties': False,
+                'required': ['id', 'links', 'name']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['backup']
+    }
+}
+
+restore_backup = {
+    'status_code': [202],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'restore': {
+                'type': 'object',
+                'properties': {
+                    'backup_id': {'type': 'string', 'format': 'uuid'},
+                    'volume_id': {'type': 'string', 'format': 'uuid'},
+                    'volume_name': {'type': 'string'},
+                },
+                'additionalProperties': False,
+                'required': ['backup_id', 'volume_id', 'volume_name']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['restore']
+    }
+}
+
+delete_backup = {'status_code': [202]}
+
+show_backup = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'backup': common_show_backup
+        },
+        'additionalProperties': False,
+        'required': ['backup']
+    }
+}
+
+list_backups_no_detail = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'backups': {
+                'type': 'array',
+                'items': {
+                    'type': 'object',
+                    'properties': {
+                        'links': parameter_types.links,
+                        'id': {'type': 'string', 'format': 'uuid'},
+                        'name': {'type': ['string', 'null']},
+                        # TODO(zhufl): count is added in 3.45, we should move
+                        # it to the 3.45 schema file when microversion is
+                        # supported in volume interfaces
+                        'count': {'type': 'integer'}
+                    },
+                    'additionalProperties': False,
+                    'required': ['links', 'id', 'name']
+                }
+            }
+        },
+        'additionalProperties': False,
+        'required': ['backups'],
+    }
+}
+
+list_backups_detail = copy.deepcopy(common_show_backup)
+# TODO(zhufl): count is added in 3.45, we should move it to the 3.45 schema
+# file when microversion is supported in volume interfaces
+list_backups_detail['properties'].update({'count': {'type': 'integer'}})
+list_backups_with_detail = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'backups': {
+                'type': 'array',
+                'items': list_backups_detail
+            }
+        },
+        'additionalProperties': False,
+        'required': ['backups'],
+    }
+}
+
+export_backup = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'backup-record': {
+                'type': 'object',
+                'properties': {
+                    'backup_service': {'type': 'string'},
+                    'backup_url': {'type': 'string'}
+                },
+                'additionalProperties': False,
+                'required': ['backup_service', 'backup_url']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['backup-record']
+    }
+}
+
+import_backup = {
+    'status_code': [201],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'backup': {
+                'type': 'object',
+                'properties': {
+                    'id': {'type': 'string', 'format': 'uuid'},
+                    'links': parameter_types.links,
+                    'name': {'type': ['string', 'null']},
+                },
+                'additionalProperties': False,
+                'required': ['id', 'links', 'name']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['backup']
+    }
+}
+
+reset_backup_status = {'status_code': [202]}
diff --git a/tempest/lib/api_schema/response/volume/group_snapshots.py b/tempest/lib/api_schema/response/volume/group_snapshots.py
new file mode 100644
index 0000000..c75c3ba
--- /dev/null
+++ b/tempest/lib/api_schema/response/volume/group_snapshots.py
@@ -0,0 +1,106 @@
+# Copyright 2015 NEC Corporation.  All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from tempest.lib.api_schema.response.compute.v2_1 import parameter_types
+
+create_group_snapshot = {
+    'status_code': [202],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'group_snapshot': {
+                'type': 'object',
+                'properties': {
+                    'id': {'type': 'string', 'format': 'uuid'},
+                    'name': {'type': 'string'},
+                    'group_type_id': {'type': 'string', 'format': 'uuid'},
+                },
+                'additionalProperties': False,
+                'required': ['id', 'name', 'group_type_id']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['group_snapshot']
+    }
+}
+
+delete_group_snapshot = {'status_code': [202]}
+
+common_show_group_snapshot = {
+    'type': 'object',
+    'properties': {
+        'created_at': parameter_types.date_time,
+        'group_id': {'type': 'string', 'format': 'uuid'},
+        'id': {'type': 'string', 'format': 'uuid'},
+        'name': {'type': 'string'},
+        'status': {'type': 'string'},
+        'description': {'type': ['string', 'null']},
+        'group_type_id': {'type': 'string', 'format': 'uuid'},
+    },
+    'additionalProperties': False,
+    'required': ['created_at', 'group_id', 'id', 'name',
+                 'status', 'description', 'group_type_id']
+}
+
+show_group_snapshot = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'group_snapshot': common_show_group_snapshot
+        },
+        'additionalProperties': False,
+        'required': ['group_snapshot']
+    }
+}
+
+list_group_snapshots_no_detail = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'group_snapshots': {
+                'type': 'array',
+                'items': {
+                    'type': 'object',
+                    'properties': {
+                        'id': {'type': 'string', 'format': 'uuid'},
+                        'name': {'type': 'string'}
+                    },
+                    'additionalProperties': False,
+                    'required': ['id', 'name'],
+                }
+            }
+        },
+        'additionalProperties': False,
+        'required': ['group_snapshots'],
+    }
+}
+
+list_group_snapshots_with_detail = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'group_snapshots': {
+                'type': 'array',
+                'items': common_show_group_snapshot
+            }
+        },
+        'additionalProperties': False,
+        'required': ['group_snapshots'],
+    }
+}
+
+reset_group_snapshot_status = {'status_code': [202]}
diff --git a/tempest/lib/api_schema/response/volume/group_types.py b/tempest/lib/api_schema/response/volume/group_types.py
index bcfa32e..4fc9ae8 100644
--- a/tempest/lib/api_schema/response/volume/group_types.py
+++ b/tempest/lib/api_schema/response/volume/group_types.py
@@ -73,6 +73,18 @@
     }
 }
 
+show_default_group_type = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'group_type': common_show_group_type
+        },
+        'additionalProperties': False,
+        'required': ['group_type']
+    }
+}
+
 update_group_type = {
     'status_code': [200],
     'response_body': {
diff --git a/tempest/lib/api_schema/response/volume/groups.py b/tempest/lib/api_schema/response/volume/groups.py
new file mode 100644
index 0000000..cb31269
--- /dev/null
+++ b/tempest/lib/api_schema/response/volume/groups.py
@@ -0,0 +1,164 @@
+# Copyright 2015 NEC Corporation.  All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from tempest.lib.api_schema.response.compute.v2_1 import parameter_types
+
+create_group = {
+    'status_code': [202],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'group': {
+                'type': 'object',
+                'properties': {
+                    'id': {'type': 'string', 'format': 'uuid'},
+                    'name': {'type': 'string'},
+                },
+                'additionalProperties': False,
+                'required': ['id', 'name']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['group']
+    }
+}
+
+delete_group = {'status_code': [202]}
+
+show_group = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'group': {
+                'type': 'object',
+                'properties': {
+                    'status': {'type': 'string'},
+                    'description': {'type': ['string', 'null']},
+                    'availability_zone': {'type': 'string'},
+                    'created_at': parameter_types.date_time,
+                    'group_type': {'type': 'string', 'format': 'uuid'},
+                    'group_snapshot_id': {'type': ['string', 'null']},
+                    'source_group_id': {'type': ['string', 'null']},
+                    'volume_types': {
+                        'type': 'array',
+                        'items': {'type': 'string', 'format': 'uuid'}
+                    },
+                    'id': {'type': 'string', 'format': 'uuid'},
+                    'name': {'type': 'string'},
+                    # TODO(zhufl): volumes is added in 3.25, we should move it
+                    # to the 3.25 schema file when microversion is supported
+                    # in volume interfaces
+                    'volumes': {
+                        'type': 'array',
+                        'items': {'type': 'string', 'format': 'uuid'}
+                    },
+                    'replication_status': {'type': 'string'}
+                },
+                'additionalProperties': False,
+                'required': ['status', 'description', 'created_at',
+                             'group_type', 'volume_types', 'id', 'name']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['group']
+    }
+}
+
+list_groups_no_detail = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'groups': {
+                'type': 'array',
+                'items': {
+                    'type': 'object',
+                    'properties': {
+                        'id': {'type': 'string', 'format': 'uuid'},
+                        'name': {'type': 'string'}
+                    },
+                    'additionalProperties': False,
+                    'required': ['id', 'name'],
+                }
+            }
+        },
+        'additionalProperties': False,
+        'required': ['groups'],
+    }
+}
+
+list_groups_with_detail = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'groups': {
+                'type': 'array',
+                'items': {
+                    'type': 'object',
+                    'properties': {
+                        'status': {'type': 'string'},
+                        'description': {'type': ['string', 'null']},
+                        'availability_zone': {'type': 'string'},
+                        'created_at': parameter_types.date_time,
+                        'group_type': {'type': 'string', 'format': 'uuid'},
+                        'group_snapshot_id': {'type': ['string', 'null']},
+                        'source_group_id': {'type': ['string', 'null']},
+                        'volume_types': {
+                            'type': 'array',
+                            'items': {'type': 'string', 'format': 'uuid'}
+                        },
+                        'id': {'type': 'string', 'format': 'uuid'},
+                        'name': {'type': 'string'},
+                        # TODO(zhufl): volumes is added in 3.25, we should
+                        # move it to the 3.25 schema file when microversion
+                        # is supported in volume interfaces
+                        'volumes': {
+                            'type': 'array',
+                            'items': {'type': 'string', 'format': 'uuid'}
+                        },
+                    },
+                    'additionalProperties': False,
+                    'required': ['status', 'description', 'created_at',
+                                 'group_type', 'volume_types', 'id', 'name']
+                }
+            }
+        },
+        'additionalProperties': False,
+        'required': ['groups'],
+    }
+}
+
+create_group_from_source = {
+    'status_code': [202],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'group': {
+                'type': 'object',
+                'properties': {
+                    'id': {'type': 'string', 'format': 'uuid'},
+                    'name': {'type': 'string'},
+                },
+                'additionalProperties': False,
+                'required': ['id', 'name']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['group']
+    }
+}
+update_group = {'status_code': [202]}
+reset_group_status = {'status_code': [202]}
diff --git a/tempest/lib/api_schema/response/volume/manage_volume.py b/tempest/lib/api_schema/response/volume/manage_volume.py
new file mode 100644
index 0000000..d3acfd9
--- /dev/null
+++ b/tempest/lib/api_schema/response/volume/manage_volume.py
@@ -0,0 +1,27 @@
+# Copyright 2018 ZTE Corporation.  All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from tempest.lib.api_schema.response.volume import volumes
+
+
+manage_volume = {
+    'status_code': [202],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'volume': volumes.common_show_volume},
+        'additionalProperties': False,
+        'required': ['volume']
+    }
+}
diff --git a/tempest/lib/api_schema/response/volume/volumes.py b/tempest/lib/api_schema/response/volume/volumes.py
new file mode 100644
index 0000000..ffcf488
--- /dev/null
+++ b/tempest/lib/api_schema/response/volume/volumes.py
@@ -0,0 +1,368 @@
+# Copyright 2018 ZTE Corporation.  All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import copy
+
+from tempest.lib.api_schema.response.compute.v2_1 import parameter_types
+
+attachments = {
+    'type': 'array',
+    'items': {
+        'type': 'object',
+        'properties': {
+            'server_id': {'type': 'string', 'format': 'uuid'},
+            'attachment_id': {'type': 'string', 'format': 'uuid'},
+            'attached_at': parameter_types.date_time_or_null,
+            'host_name': {'type': ['string', 'null']},
+            'volume_id': {'type': 'string', 'format': 'uuid'},
+            'device': {'type': ['string', 'null']},
+            'id': {'type': 'string', 'format': 'uuid'}
+        },
+        'additionalProperties': False,
+        'required': ['server_id', 'attachment_id', 'host_name',
+                     'volume_id', 'device', 'id']
+    }
+}
+
+common_show_volume = {
+    'type': 'object',
+    'properties': {
+        'migration_status': {'type': ['string', 'null']},
+        'attachments': attachments,
+        'links': parameter_types.links,
+        'availability_zone': {'type': ['string', 'null']},
+        'os-vol-host-attr:host': {
+            'type': ['string', 'null'], 'pattern': '.+@.+#.+'},
+        'encrypted': {'type': 'boolean'},
+        'updated_at': parameter_types.date_time_or_null,
+        'replication_status': {'type': ['string', 'null']},
+        'snapshot_id': parameter_types.uuid_or_null,
+        'id': {'type': 'string', 'format': 'uuid'},
+        'size': {'type': 'integer'},
+        'user_id': {'type': 'string', 'format': 'uuid'},
+        'os-vol-tenant-attr:tenant_id': {'type': 'string',
+                                         'format': 'uuid'},
+        'os-vol-mig-status-attr:migstat': {'type': ['string', 'null']},
+        'metadata': {'type': 'object'},
+        'status': {'type': 'string'},
+        'volume_image_metadata': {'type': ['object', 'null']},
+        'description': {'type': ['string', 'null']},
+        'multiattach': {'type': 'boolean'},
+        'source_volid': parameter_types.uuid_or_null,
+        'consistencygroup_id': parameter_types.uuid_or_null,
+        'os-vol-mig-status-attr:name_id': parameter_types.uuid_or_null,
+        'name': {'type': ['string', 'null']},
+        'bootable': {'type': 'string'},
+        'created_at': parameter_types.date_time,
+        'volume_type': {'type': ['string', 'null']},
+        # TODO(zhufl): group_id is added in 3.13, we should move it to the
+        # 3.13 schema file when microversion is supported in volume interfaces
+        'group_id': parameter_types.uuid_or_null,
+        # TODO(zhufl): provider_id is added in 3.21, we should move it to the
+        # 3.21 schema file when microversion is supported in volume interfaces
+        'provider_id': parameter_types.uuid_or_null,
+        # TODO(zhufl): service_uuid and shared_targets are added in 3.48,
+        # we should move them to the 3.48 schema file when microversion
+        # is supported in volume interfaces.
+        'service_uuid': parameter_types.uuid_or_null,
+        'shared_targets': {'type': 'boolean'}
+    },
+    'additionalProperties': False,
+    'required': ['attachments', 'links', 'encrypted',
+                 'updated_at', 'replication_status', 'id',
+                 'size', 'user_id', 'availability_zone',
+                 'metadata', 'status', 'description',
+                 'multiattach', 'consistencygroup_id',
+                 'name', 'bootable', 'created_at',
+                 'volume_type', 'snapshot_id', 'source_volid']
+}
+
+list_volumes_no_detail = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'volumes': {
+                'type': 'array',
+                'items': {
+                    'type': 'object',
+                    'properties': {
+                        'links': parameter_types.links,
+                        'id': {'type': 'string', 'format': 'uuid'},
+                        'name': {'type': ['string', 'null']},
+                        # TODO(zhufl): count is added in 3.45, we should move
+                        # it to the 3.45 schema file when microversion is
+                        # supported in volume interfaces
+                        # 'count': {'type': 'integer'}
+                    },
+                    'additionalProperties': False,
+                    'required': ['links', 'id', 'name']
+                }
+            },
+            'volumes_links': parameter_types.links
+        },
+        'additionalProperties': False,
+        'required': ['volumes']
+    }
+}
+
+show_volume = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'volume': common_show_volume
+        },
+        'additionalProperties': False,
+        'required': ['volume']
+    }
+}
+
+list_volumes_detail = copy.deepcopy(common_show_volume)
+# TODO(zhufl): count is added in 3.45, we should move it to the 3.45 schema
+# file when microversion is supported in volume interfaces
+# list_volumes_detail['properties'].update({'count': {'type': 'integer'}})
+list_volumes_with_detail = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'volumes': {
+                'type': 'array',
+                'items': list_volumes_detail
+            },
+            'volumes_links': parameter_types.links
+        },
+        'additionalProperties': False,
+        'required': ['volumes']
+    }
+}
+
+create_volume = {
+    'status_code': [202],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'volume': {
+                'type': 'object',
+                'properties': {
+                    'migration_status': {'type': ['string', 'null']},
+                    'attachments': attachments,
+                    'links': parameter_types.links,
+                    'availability_zone': {'type': ['string', 'null']},
+                    'encrypted': {'type': 'boolean'},
+                    'updated_at': parameter_types.date_time_or_null,
+                    'replication_status': {'type': ['string', 'null']},
+                    'snapshot_id': parameter_types.uuid_or_null,
+                    'id': {'type': 'string', 'format': 'uuid'},
+                    'size': {'type': 'integer'},
+                    'user_id': {'type': 'string', 'format': 'uuid'},
+                    'metadata': {'type': 'object'},
+                    'status': {'type': 'string'},
+                    'description': {'type': ['string', 'null']},
+                    'multiattach': {'type': 'boolean'},
+                    'source_volid': parameter_types.uuid_or_null,
+                    'consistencygroup_id': parameter_types.uuid_or_null,
+                    'name': {'type': ['string', 'null']},
+                    'bootable': {'type': 'string'},
+                    'created_at': parameter_types.date_time,
+                    'volume_type': {'type': ['string', 'null']},
+                    # TODO(zhufl): group_id is added in 3.13, we should move
+                    # it to the 3.13 schema file when microversion is
+                    # supported in volume interfaces.
+                    'group_id': parameter_types.uuid_or_null,
+                    # TODO(zhufl): provider_id is added in 3.21, we should
+                    # move it to the 3.21 schema file when microversion is
+                    # supported in volume interfaces
+                    'provider_id': parameter_types.uuid_or_null,
+                    # TODO(zhufl): service_uuid and shared_targets are added
+                    # in 3.48, we should move them to the 3.48 schema file
+                    # when microversion is supported in volume interfaces.
+                    'service_uuid': parameter_types.uuid_or_null,
+                    'shared_targets': {'type': 'boolean'}
+                },
+                'additionalProperties': False,
+                'required': ['attachments', 'links', 'encrypted',
+                             'updated_at', 'replication_status', 'id',
+                             'size', 'user_id', 'availability_zone',
+                             'metadata', 'status', 'description',
+                             'multiattach', 'consistencygroup_id',
+                             'name', 'bootable', 'created_at',
+                             'volume_type', 'snapshot_id', 'source_volid']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['volume']
+    }
+}
+
+update_volume = copy.deepcopy(create_volume)
+update_volume.update({'status_code': [200]})
+
+delete_volume = {'status_code': [202]}
+
+show_volume_summary = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'volume-summary': {
+                'type': 'object',
+                'properties': {
+                    'total_size': {'type': 'integer'},
+                    'total_count': {'type': 'integer'},
+                    # TODO(zhufl): metadata is added in 3.36, we should move
+                    # it to the 3.36 schema file when microversion is
+                    # supported in volume interfaces
+                    'metadata': {'type': 'object'},
+                },
+                'additionalProperties': False,
+                'required': ['total_size', 'total_count']
+            }
+        },
+        'additionalProperties': False,
+        'required': ['volume-summary']
+    }
+}
+
+# TODO(zhufl): This is under discussion, so will be merged in a seperate patch.
+# https://bugs.launchpad.net/cinder/+bug/1880566
+# upload_volume = {
+#     'status_code': [202],
+#     'response_body': {
+#         'type': 'object',
+#         'properties': {
+#             'os-volume_upload_image': {
+#                 'type': 'object',
+#                 'properties': {
+#                     'status': {'type': 'string'},
+#                     'image_name': {'type': 'string'},
+#                     'disk_format': {'type': 'string'},
+#                     'container_format': {'type': 'string'},
+#                     'is_public': {'type': 'boolean'},
+#                     'visibility': {'type': 'string'},
+#                     'protected': {'type': 'boolean'},
+#                     'updated_at': parameter_types.date_time_or_null,
+#                     'image_id': {'type': 'string', 'format': 'uuid'},
+#                     'display_description': {'type': ['string', 'null']},
+#                     'id': {'type': 'string', 'format': 'uuid'},
+#                     'size': {'type': 'integer'},
+#                     'volume_type': {
+#                         'type': ['object', 'null'],
+#                         'properties': {
+#                             'created_at': parameter_types.date_time,
+#                             'deleted': {'type': 'boolean'},
+#                             'deleted_at': parameter_types.date_time_or_null,
+#                             'description': {'type': ['string', 'null']},
+#                             'extra_specs': {
+#                                 'type': 'object',
+#                                 'patternProperties': {
+#                                     '^.+$': {'type': 'string'}
+#                                 }
+#                             },
+#                             'id': {'type': 'string', 'format': 'uuid'},
+#                             'is_public': {'type': 'boolean'},
+#                             'name': {'type': ['string', 'null']},
+#                             'qos_specs_id': parameter_types.uuid_or_null,
+#                             'updated_at': parameter_types.date_time_or_null
+#                         },
+#                     }
+#                 },
+#                 'additionalProperties': False,
+#                 'required': ['status', 'image_name', 'updated_at',
+#                              'image_id',
+#                              'display_description', 'id', 'size',
+#                              'volume_type', 'disk_format',
+#                              'container_format']
+#             }
+#         },
+#         'additionalProperties': False,
+#         'required': ['os-volume_upload_image']
+#     }
+# }
+
+attach_volume = {'status_code': [202]}
+set_bootable_volume = {'status_code': [200]}
+detach_volume = {'status_code': [202]}
+reserve_volume = {'status_code': [202]}
+unreserve_volume = {'status_code': [202]}
+extend_volume = {'status_code': [202]}
+reset_volume_status = {'status_code': [202]}
+update_volume_readonly = {'status_code': [202]}
+force_delete_volume = {'status_code': [202]}
+retype_volume = {'status_code': [202]}
+force_detach_volume = {'status_code': [202]}
+
+create_volume_metadata = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'metadata': {'type': 'object'},
+        },
+        'additionalProperties': False,
+        'required': ['metadata']
+    }
+}
+
+show_volume_metadata = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'metadata': {'type': 'object'},
+        },
+        'additionalProperties': False,
+        'required': ['metadata']
+    }
+}
+update_volume_metadata = copy.deepcopy(show_volume_metadata)
+
+show_volume_metadata_item = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'meta': {'type': 'object'},
+        },
+        'additionalProperties': False,
+        'required': ['meta']
+    }
+}
+update_volume_metadata_item = copy.deepcopy(show_volume_metadata_item)
+delete_volume_metadata_item = {'status_code': [200]}
+
+update_volume_image_metadata = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {'metadata': {'type': 'object'}},
+        'additionalProperties': False,
+        'required': ['metadata']
+    }
+}
+delete_volume_image_metadata = {'status_code': [200]}
+show_volume_image_metadata = {
+    'status_code': [200],
+    'response_body': {
+        'type': 'object',
+        'properties': {
+            'metadata': {'type': 'object'},
+        },
+        'additionalProperties': False,
+        'required': ['metadata']
+    }
+}
+
+unmanage_volume = {'status_code': [202]}
diff --git a/tempest/lib/cmd/skip_tracker.py b/tempest/lib/cmd/skip_tracker.py
index 87806b7..95376e3 100755
--- a/tempest/lib/cmd/skip_tracker.py
+++ b/tempest/lib/cmd/skip_tracker.py
@@ -31,10 +31,11 @@
 except ImportError:
     launchpad = None
 
-LPCACHEDIR = os.path.expanduser('~/.launchpadlib/cache')
+LPCACHEDIR = os.path.expanduser(os.path.join('~', '.launchpadlib', 'cache'))
 LOG = logging.getLogger(__name__)
 
-BASEDIR = os.path.abspath(os.path.join(os.path.dirname(__file__), '../../..'))
+BASEDIR = os.path.abspath(os.path.join(os.path.dirname(__file__),
+                                       '..', '..', '..'))
 TESTDIR = os.path.join(BASEDIR, 'tempest')
 
 
diff --git a/tempest/lib/common/preprov_creds.py b/tempest/lib/common/preprov_creds.py
index 1011504..641d727 100644
--- a/tempest/lib/common/preprov_creds.py
+++ b/tempest/lib/common/preprov_creds.py
@@ -172,7 +172,7 @@
         return self.is_multi_user()
 
     def _create_hash_file(self, hash_string):
-        path = os.path.join(os.path.join(self.accounts_dir, hash_string))
+        path = os.path.join(self.accounts_dir, hash_string)
         if not os.path.isfile(path):
             with open(path, 'w') as fd:
                 fd.write(self.name)
@@ -194,8 +194,7 @@
             if res:
                 return _hash
             else:
-                path = os.path.join(os.path.join(self.accounts_dir,
-                                                 _hash))
+                path = os.path.join(self.accounts_dir, _hash)
                 with open(path, 'r') as fd:
                     names.append(fd.read())
         msg = ('Insufficient number of users provided. %s have allocated all '
diff --git a/tempest/lib/common/rest_client.py b/tempest/lib/common/rest_client.py
index 431a0a0..0513e90 100644
--- a/tempest/lib/common/rest_client.py
+++ b/tempest/lib/common/rest_client.py
@@ -21,6 +21,7 @@
 
 import jsonschema
 from oslo_log import log as logging
+from oslo_log import versionutils
 from oslo_serialization import jsonutils as json
 import six
 from six.moves import urllib
@@ -177,13 +178,27 @@
         return self.auth_provider.credentials.tenant_name
 
     @property
+    def project_id(self):
+        """The project id being used for requests
+
+        :rtype: string
+        :return: The project id being used for requests
+        """
+        return self.auth_provider.credentials.tenant_id
+
+    @property
     def tenant_id(self):
         """The tenant/project id being used for requests
 
         :rtype: string
         :return: The tenant/project id being used for requests
         """
-        return self.auth_provider.credentials.tenant_id
+        # NOTE(ralonsoh): this property should be deprecated, reference
+        # blueprint adopt-oslo-versioned-objects-for-db.
+        versionutils.report_deprecated_feature(
+            self.LOG, '"tenant_id" property is deprecated for removal, use '
+                      '"project_id" instead')
+        return self.project_id
 
     @property
     def password(self):
@@ -899,12 +914,44 @@
                 raise exceptions.TimeoutException(message)
             time.sleep(self.build_interval)
 
+    def wait_for_resource_activation(self, id):
+        """Waits for a resource to become active
+
+        This method will loop over is_resource_active until either
+        is_resource_active returns True or the build timeout is reached. This
+        depends on is_resource_active being implemented
+
+        :param str id: The id of the resource to check
+        :raises TimeoutException: If the build_timeout has elapsed and the
+                                  resource still hasn't been active
+        """
+        start_time = int(time.time())
+        while True:
+            if self.is_resource_active(id):
+                return
+            if int(time.time()) - start_time >= self.build_timeout:
+                message = ('Failed to reach active state %(resource_type)s '
+                           '%(id)s within the required time (%(timeout)s s).' %
+                           {'resource_type': self.resource_type, 'id': id,
+                            'timeout': self.build_timeout})
+                caller = test_utils.find_test_caller()
+                if caller:
+                    message = '(%s) %s' % (caller, message)
+                raise exceptions.TimeoutException(message)
+            time.sleep(self.build_interval)
+
     def is_resource_deleted(self, id):
         """Subclasses override with specific deletion detection."""
         message = ('"%s" does not implement is_resource_deleted'
                    % self.__class__.__name__)
         raise NotImplementedError(message)
 
+    def is_resource_active(self, id):
+        """Subclasses override with specific active detection."""
+        message = ('"%s" does not implement is_resource_active'
+                   % self.__class__.__name__)
+        raise NotImplementedError(message)
+
     @property
     def resource_type(self):
         """Returns the primary type of resource this client works with."""
diff --git a/tempest/lib/common/thread.py b/tempest/lib/common/thread.py
index 510fc36..b47d40d 100644
--- a/tempest/lib/common/thread.py
+++ b/tempest/lib/common/thread.py
@@ -13,10 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-# This make disable relative module import
-from __future__ import absolute_import
-
-
 import six
 
 if six.PY2:
diff --git a/tempest/lib/common/utils/linux/remote_client.py b/tempest/lib/common/utils/linux/remote_client.py
index 8ac1d38..71fed02 100644
--- a/tempest/lib/common/utils/linux/remote_client.py
+++ b/tempest/lib/common/utils/linux/remote_client.py
@@ -11,7 +11,6 @@
 #    under the License.
 
 import functools
-import re
 import sys
 
 import netaddr
@@ -134,9 +133,8 @@
         This method will not unmount the config drive, so unmount_config_drive
         must be used for cleanup.
         """
-        cmd_blkid = 'blkid | grep -i config-2'
-        result = self.exec_command(cmd_blkid)
-        dev_name = re.match('([^:]+)', result).group()
+        cmd_blkid = 'blkid -L config-2 -o device'
+        dev_name = self.exec_command(cmd_blkid).strip()
 
         try:
             self.exec_command('sudo mount %s /mnt' % dev_name)
diff --git a/tempest/lib/decorators.py b/tempest/lib/decorators.py
index 808e0fb..ebe2d61 100644
--- a/tempest/lib/decorators.py
+++ b/tempest/lib/decorators.py
@@ -124,7 +124,7 @@
     def decorator(f):
         f = testtools.testcase.attr('id-%s' % id)(f)
         if f.__doc__:
-            f.__doc__ = 'Test idempotent id: %s\n%s' % (id, f.__doc__)
+            f.__doc__ = 'Test idempotent id: %s\n\n%s' % (id, f.__doc__)
         else:
             f.__doc__ = 'Test idempotent id: %s' % id
         return f
diff --git a/tempest/lib/services/compute/servers_client.py b/tempest/lib/services/compute/servers_client.py
index 3ceecda..6723516 100644
--- a/tempest/lib/services/compute/servers_client.py
+++ b/tempest/lib/services/compute/servers_client.py
@@ -206,7 +206,10 @@
     def action(self, server_id, action_name,
                schema=schema.server_actions_common_schema,
                **kwargs):
-        post_body = json.dumps({action_name: kwargs})
+        if 'body' in kwargs:
+            post_body = json.dumps(kwargs['body'])
+        else:
+            post_body = json.dumps({action_name: kwargs})
         resp, body = self.post('servers/%s/action' % server_id,
                                post_body)
         if body:
@@ -608,6 +611,15 @@
         API reference:
         https://docs.openstack.org/api-ref/compute/#unshelve-restore-shelved-server-unshelve-action
         """
+        # NOTE(gmann): pass None as request body if nothing is requested.
+        # Nova started the request body check since 2.77 microversion and only
+        # accept AZ or None as valid req body and reject the empty dict {}.
+        # Before 2.77 microverison anything is valid body as Nova does not
+        # check the request body but as per api-ref None is valid request
+        # body to pass so we do not need to check the requested microversion
+        # here and always default req body to None.
+        if not kwargs:
+            kwargs['body'] = {'unshelve': None}
         return self.action(server_id, 'unshelve', **kwargs)
 
     def shelve_offload_server(self, server_id, **kwargs):
diff --git a/tempest/lib/services/image/v2/images_client.py b/tempest/lib/services/image/v2/images_client.py
index 90778da..4713cce 100644
--- a/tempest/lib/services/image/v2/images_client.py
+++ b/tempest/lib/services/image/v2/images_client.py
@@ -128,6 +128,15 @@
             return True
         return False
 
+    def is_resource_active(self, id):
+        try:
+            image = self.show_image(id)
+            if image['status'] != 'active':
+                return False
+        except lib_exc.NotFound:
+            return False
+        return True
+
     @property
     def resource_type(self):
         """Returns the primary type of resource this client works with."""
@@ -152,6 +161,83 @@
         self.expected_success(204, resp.status)
         return rest_client.ResponseBody(resp, body)
 
+    def stage_image_file(self, image_id, data):
+        """Upload binary image data to staging area.
+
+        For a full list of available parameters, please refer to the official
+        API reference (stage API:
+        https://docs.openstack.org/api-ref/image/v2/#interoperable-image-import
+        """
+        url = 'images/%s/stage' % image_id
+
+        # We are going to do chunked transfer, so split the input data
+        # info fixed-sized chunks.
+        headers = {'Content-Type': 'application/octet-stream'}
+        data = iter(functools.partial(data.read, CHUNKSIZE), b'')
+
+        resp, body = self.request('PUT', url, headers=headers,
+                                  body=data, chunked=True)
+        self.expected_success(204, resp.status)
+        return rest_client.ResponseBody(resp, body)
+
+    def info_import(self):
+        """Return information about server-supported import methods."""
+        url = 'info/import'
+        resp, body = self.get(url)
+
+        self.expected_success(200, resp.status)
+        body = json.loads(body)
+        return rest_client.ResponseBody(resp, body)
+
+    def info_stores(self):
+        """Return information about server-supported stores."""
+        url = 'info/stores'
+        resp, body = self.get(url)
+        body = json.loads(body)
+        return rest_client.ResponseBody(resp, body)
+
+    def image_import(self, image_id, method='glance-direct',
+                     all_stores_must_succeed=None, all_stores=True,
+                     stores=None, image_uri=None):
+        """Import data from staging area to glance store.
+
+        For a full list of available parameters, please refer to the official
+        API reference (stage API:
+        https://docs.openstack.org/api-ref/image/v2/#interoperable-image-import
+
+        :param method: The import method (i.e. glance-direct) to use
+        :param all_stores_must_succeed: Boolean indicating if all store imports
+                                        must succeed for the import to be
+                                        considered successful. Must be None if
+                                        server does not support multistore.
+        :param all_stores: Boolean indicating if image should be imported to
+                           all available stores (incompatible with stores)
+        :param stores: A list of destination store names for the import. Must
+                       be None if server does not support multistore.
+        :param image_uri: A URL to be used with the web-download method
+        """
+        url = 'images/%s/import' % image_id
+        data = {
+            "method": {
+                "name": method
+            },
+        }
+        if stores is not None:
+            data["stores"] = stores
+        else:
+            data["all_stores"] = all_stores
+
+        if all_stores_must_succeed is not None:
+            data['all_stores_must_succeed'] = all_stores_must_succeed
+        if image_uri:
+            data['method']['uri'] = image_uri
+        data = json.dumps(data)
+        headers = {'Content-Type': 'application/json'}
+        resp, _ = self.post(url, data, headers=headers)
+
+        self.expected_success(202, resp.status)
+        return rest_client.ResponseBody(resp)
+
     def show_image_file(self, image_id):
         """Download binary image data.
 
diff --git a/tempest/lib/services/network/quotas_client.py b/tempest/lib/services/network/quotas_client.py
index 997d201..96cc65d 100644
--- a/tempest/lib/services/network/quotas_client.py
+++ b/tempest/lib/services/network/quotas_client.py
@@ -12,11 +12,33 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import functools
+
 from tempest.lib.services.network import base
 
 
+def _warning_deprecate_tenant_id(func):
+    @functools.wraps(func)
+    def inner(*args, **kwargs):
+        _self = args[0]
+        # check length of arg to know whether 'tenant_id' is passed as
+        # positional arg or kwargs.
+        if len(args) < 2:
+            if 'tenant_id' in kwargs:
+                _self.LOG.warning(
+                    'positional arg name "tenant_id" is deprecated, for '
+                    'removal, please start using "project_id" instead')
+            elif 'project_id' in kwargs:
+                # fallback to deprecated name till deprecation phase.
+                kwargs['tenant_id'] = kwargs.pop('project_id')
+
+        return func(*args, **kwargs)
+    return inner
+
+
 class QuotasClient(base.BaseNetworkClient):
 
+    @_warning_deprecate_tenant_id
     def update_quotas(self, tenant_id, **kwargs):
         """Update quota for a project.
 
@@ -28,12 +50,14 @@
         uri = '/quotas/%s' % tenant_id
         return self.update_resource(uri, put_body)
 
+    @_warning_deprecate_tenant_id
     def reset_quotas(self, tenant_id):  # noqa
         # NOTE: This noqa is for passing T111 check and we cannot rename
         #       to keep backwards compatibility.
         uri = '/quotas/%s' % tenant_id
         return self.delete_resource(uri)
 
+    @_warning_deprecate_tenant_id
     def show_quotas(self, tenant_id, **fields):
         """Show quota for a project.
 
@@ -54,11 +78,13 @@
         uri = '/quotas'
         return self.list_resources(uri, **filters)
 
+    @_warning_deprecate_tenant_id
     def show_default_quotas(self, tenant_id):
         """List default quotas for a project."""
         uri = '/quotas/%s/default' % tenant_id
         return self.show_resource(uri)
 
+    @_warning_deprecate_tenant_id
     def show_quota_details(self, tenant_id):
         """Show quota details for a project."""
         uri = '/quotas/%s/details.json' % tenant_id
diff --git a/tempest/lib/services/volume/v3/backups_client.py b/tempest/lib/services/volume/v3/backups_client.py
index 970471e..1df45fa 100644
--- a/tempest/lib/services/volume/v3/backups_client.py
+++ b/tempest/lib/services/volume/v3/backups_client.py
@@ -16,6 +16,7 @@
 from oslo_serialization import jsonutils as json
 from six.moves.urllib import parse as urllib
 
+from tempest.lib.api_schema.response.volume import backups as schema
 from tempest.lib.common import rest_client
 from tempest.lib import exceptions as lib_exc
 from tempest.lib.services.volume import base_client
@@ -34,7 +35,7 @@
         post_body = json.dumps({'backup': kwargs})
         resp, body = self.post('backups', post_body)
         body = json.loads(body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.create_backup, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def update_backup(self, backup_id, **kwargs):
@@ -47,7 +48,7 @@
         put_body = json.dumps({'backup': kwargs})
         resp, body = self.put('backups/%s' % backup_id, put_body)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.update_backup, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def restore_backup(self, backup_id, **kwargs):
@@ -60,13 +61,13 @@
         post_body = json.dumps({'restore': kwargs})
         resp, body = self.post('backups/%s/restore' % (backup_id), post_body)
         body = json.loads(body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.restore_backup, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def delete_backup(self, backup_id):
         """Delete a backup of volume."""
         resp, body = self.delete('backups/%s' % backup_id)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.delete_backup, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def show_backup(self, backup_id):
@@ -74,7 +75,7 @@
         url = "backups/%s" % backup_id
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_backup, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def list_backups(self, detail=False, **params):
@@ -86,13 +87,15 @@
         https://docs.openstack.org/api-ref/block-storage/v3/index.html#list-backups-with-detail
         """
         url = "backups"
+        list_backups_schema = schema.list_backups_no_detail
         if detail:
             url += "/detail"
+            list_backups_schema = schema.list_backups_with_detail
         if params:
             url += '?%s' % urllib.urlencode(params)
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(list_backups_schema, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def export_backup(self, backup_id):
@@ -100,7 +103,7 @@
         url = "backups/%s/export_record" % backup_id
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.export_backup, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def import_backup(self, **kwargs):
@@ -113,14 +116,14 @@
         post_body = json.dumps({'backup-record': kwargs})
         resp, body = self.post("backups/import_record", post_body)
         body = json.loads(body)
-        self.expected_success(201, resp.status)
+        self.validate_response(schema.import_backup, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def reset_backup_status(self, backup_id, status):
         """Reset the specified backup's status."""
         post_body = json.dumps({'os-reset_status': {"status": status}})
         resp, body = self.post('backups/%s/action' % backup_id, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.reset_backup_status, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def is_resource_deleted(self, id):
diff --git a/tempest/lib/services/volume/v3/group_snapshots_client.py b/tempest/lib/services/volume/v3/group_snapshots_client.py
index e425a3f..4051c06 100644
--- a/tempest/lib/services/volume/v3/group_snapshots_client.py
+++ b/tempest/lib/services/volume/v3/group_snapshots_client.py
@@ -16,6 +16,7 @@
 from oslo_serialization import jsonutils as json
 from six.moves.urllib import parse as urllib
 
+from tempest.lib.api_schema.response.volume import group_snapshots as schema
 from tempest.lib.common import rest_client
 from tempest.lib import exceptions as lib_exc
 from tempest.lib.services.volume import base_client
@@ -34,7 +35,7 @@
         post_body = json.dumps({'group_snapshot': kwargs})
         resp, body = self.post('group_snapshots', post_body)
         body = json.loads(body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.create_group_snapshot, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def delete_group_snapshot(self, group_snapshot_id):
@@ -44,7 +45,7 @@
         https://docs.openstack.org/api-ref/block-storage/v3/#delete-group-snapshot
         """
         resp, body = self.delete('group_snapshots/%s' % group_snapshot_id)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.delete_group_snapshot, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def show_group_snapshot(self, group_snapshot_id):
@@ -56,7 +57,7 @@
         url = "group_snapshots/%s" % str(group_snapshot_id)
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_group_snapshot, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def list_group_snapshots(self, detail=False, **params):
@@ -67,13 +68,15 @@
         https://docs.openstack.org/api-ref/block-storage/v3/#list-group-snapshots-with-details
         """
         url = "group_snapshots"
+        list_group_snapshots = schema.list_group_snapshots_no_detail
         if detail:
             url += "/detail"
+            list_group_snapshots = schema.list_group_snapshots_with_detail
         if params:
             url += '?%s' % urllib.urlencode(params)
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(list_group_snapshots, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def reset_group_snapshot_status(self, group_snapshot_id, status_to_set):
@@ -85,7 +88,7 @@
         post_body = json.dumps({'reset_status': {'status': status_to_set}})
         resp, body = self.post('group_snapshots/%s/action' % group_snapshot_id,
                                post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.reset_group_snapshot_status, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def is_resource_deleted(self, id):
diff --git a/tempest/lib/services/volume/v3/group_types_client.py b/tempest/lib/services/volume/v3/group_types_client.py
index e0bf5e2..1dcd508 100644
--- a/tempest/lib/services/volume/v3/group_types_client.py
+++ b/tempest/lib/services/volume/v3/group_types_client.py
@@ -73,7 +73,7 @@
         url = 'group_types/default'
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_default_group_type, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def show_group_type(self, group_type_id):
diff --git a/tempest/lib/services/volume/v3/groups_client.py b/tempest/lib/services/volume/v3/groups_client.py
index ffae232..3d8523d 100644
--- a/tempest/lib/services/volume/v3/groups_client.py
+++ b/tempest/lib/services/volume/v3/groups_client.py
@@ -16,6 +16,7 @@
 from oslo_serialization import jsonutils as json
 from six.moves.urllib import parse as urllib
 
+from tempest.lib.api_schema.response.volume import groups as schema
 from tempest.lib.common import rest_client
 from tempest.lib import exceptions as lib_exc
 from tempest.lib.services.volume import base_client
@@ -23,6 +24,7 @@
 
 class GroupsClient(base_client.BaseClient):
     """Client class to send CRUD Volume Group API requests"""
+    api_version = 'v3'
 
     def create_group(self, **kwargs):
         """Creates a group.
@@ -35,7 +37,7 @@
         post_body = json.dumps({'group': kwargs})
         resp, body = self.post('groups', post_body)
         body = json.loads(body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.create_group, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def delete_group(self, group_id, delete_volumes=True):
@@ -49,7 +51,7 @@
         post_body = json.dumps({'delete': post_body})
         resp, body = self.post('groups/%s/action' % group_id,
                                post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.delete_group, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def show_group(self, group_id):
@@ -62,7 +64,7 @@
         url = "groups/%s" % str(group_id)
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_group, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def list_groups(self, detail=False, **params):
@@ -74,13 +76,15 @@
         https://docs.openstack.org/api-ref/block-storage/v3/#list-groups-with-details
         """
         url = "groups"
+        schema_list_groups = schema.list_groups_no_detail
         if detail:
             url += "/detail"
+            schema_list_groups = schema.list_groups_with_detail
         if params:
             url += '?%s' % urllib.urlencode(params)
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema_list_groups, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def create_group_from_source(self, **kwargs):
@@ -93,7 +97,7 @@
         post_body = json.dumps({'create-from-src': kwargs})
         resp, body = self.post('groups/action', post_body)
         body = json.loads(body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.create_group_from_source, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def update_group(self, group_id, **kwargs):
@@ -105,7 +109,7 @@
         """
         put_body = json.dumps({'group': kwargs})
         resp, body = self.put('groups/%s' % group_id, put_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.update_group, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def reset_group_status(self, group_id, status_to_set):
@@ -116,7 +120,7 @@
         """
         post_body = json.dumps({'reset_status': {'status': status_to_set}})
         resp, body = self.post('groups/%s/action' % group_id, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.reset_group_status, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def is_resource_deleted(self, id):
diff --git a/tempest/lib/services/volume/v3/versions_client.py b/tempest/lib/services/volume/v3/versions_client.py
index aa6c867..4ac4112 100644
--- a/tempest/lib/services/volume/v3/versions_client.py
+++ b/tempest/lib/services/volume/v3/versions_client.py
@@ -54,8 +54,9 @@
         """
 
         version_url = urljoin(self._get_base_version_url(), version + '/')
-        resp, body = self.raw_request(version_url, 'GET',
-                                      {'X-Auth-Token': self.token})
+        headers = self.get_headers()
+        headers['X-Auth-Token'] = self.token
+        resp, body = self.raw_request(version_url, 'GET', headers=headers)
         self._error_checker(resp, body)
         body = json.loads(body)
         self.validate_response(schema.volume_api_version_details, resp, body)
diff --git a/tempest/lib/services/volume/v3/volume_manage_client.py b/tempest/lib/services/volume/v3/volume_manage_client.py
index 85b1b82..f6642c5 100644
--- a/tempest/lib/services/volume/v3/volume_manage_client.py
+++ b/tempest/lib/services/volume/v3/volume_manage_client.py
@@ -15,6 +15,7 @@
 
 from oslo_serialization import jsonutils as json
 
+from tempest.lib.api_schema.response.volume import manage_volume as schema
 from tempest.lib.common import rest_client
 
 
@@ -30,6 +31,6 @@
         """
         post_body = json.dumps({'volume': kwargs})
         resp, body = self.post('os-volume-manage', post_body)
-        self.expected_success(202, resp.status)
         body = json.loads(body)
+        self.validate_response(schema.manage_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
diff --git a/tempest/lib/services/volume/v3/volumes_client.py b/tempest/lib/services/volume/v3/volumes_client.py
index 4fb6d2e..b8535d8 100644
--- a/tempest/lib/services/volume/v3/volumes_client.py
+++ b/tempest/lib/services/volume/v3/volumes_client.py
@@ -17,6 +17,7 @@
 import six
 from six.moves.urllib import parse as urllib
 
+from tempest.lib.api_schema.response.volume import volumes as schema
 from tempest.lib.common import rest_client
 from tempest.lib import exceptions as lib_exc
 from tempest.lib.services.volume import base_client
@@ -55,14 +56,16 @@
         https://docs.openstack.org/api-ref/block-storage/v3/index.html#list-accessible-volumes
         """
         url = 'volumes'
+        list_schema = schema.list_volumes_no_detail
         if detail:
+            list_schema = schema.list_volumes_with_detail
             url += '/detail'
         if params:
             url += '?%s' % self._prepare_params(params)
 
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(list_schema, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def migrate_volume(self, volume_id, **kwargs):
@@ -83,7 +86,7 @@
         url = "volumes/%s" % volume_id
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def create_volume(self, **kwargs):
@@ -96,7 +99,7 @@
         post_body = json.dumps({'volume': kwargs})
         resp, body = self.post('volumes', post_body)
         body = json.loads(body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.create_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def update_volume(self, volume_id, **kwargs):
@@ -109,7 +112,7 @@
         put_body = json.dumps({'volume': kwargs})
         resp, body = self.put('volumes/%s' % volume_id, put_body)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.update_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def delete_volume(self, volume_id, **params):
@@ -123,7 +126,7 @@
         if params:
             url += '?%s' % urllib.urlencode(params)
         resp, body = self.delete(url)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.delete_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def show_volume_summary(self, **params):
@@ -138,7 +141,7 @@
             url += '?%s' % urllib.urlencode(params)
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_volume_summary, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def upload_volume(self, volume_id, **kwargs):
@@ -152,6 +155,10 @@
         url = 'volumes/%s/action' % (volume_id)
         resp, body = self.post(url, post_body)
         body = json.loads(body)
+        # TODO(zhufl): This is under discussion, so will be merged
+        # in a seperate patch.
+        # https://bugs.launchpad.net/cinder/+bug/1880566
+        # self.validate_response(schema.upload_volume, resp, body)
         self.expected_success(202, resp.status)
         return rest_client.ResponseBody(resp, body)
 
@@ -165,7 +172,7 @@
         post_body = json.dumps({'os-attach': kwargs})
         url = 'volumes/%s/action' % (volume_id)
         resp, body = self.post(url, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.attach_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def set_bootable_volume(self, volume_id, **kwargs):
@@ -178,7 +185,7 @@
         post_body = json.dumps({'os-set_bootable': kwargs})
         url = 'volumes/%s/action' % (volume_id)
         resp, body = self.post(url, post_body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.set_bootable_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def detach_volume(self, volume_id):
@@ -186,7 +193,7 @@
         post_body = json.dumps({'os-detach': {}})
         url = 'volumes/%s/action' % (volume_id)
         resp, body = self.post(url, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.detach_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def reserve_volume(self, volume_id):
@@ -194,7 +201,7 @@
         post_body = json.dumps({'os-reserve': {}})
         url = 'volumes/%s/action' % (volume_id)
         resp, body = self.post(url, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.reserve_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def unreserve_volume(self, volume_id):
@@ -202,7 +209,7 @@
         post_body = json.dumps({'os-unreserve': {}})
         url = 'volumes/%s/action' % (volume_id)
         resp, body = self.post(url, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.unreserve_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def is_resource_deleted(self, id):
@@ -219,7 +226,7 @@
         if volume["volume"]["status"] == "error_deleting":
             raise lib_exc.DeleteErrorException(
                 "Volume %s failed to delete and is in error_deleting status" %
-                volume['id'])
+                volume['volume']['id'])
         return False
 
     @property
@@ -237,7 +244,7 @@
         post_body = json.dumps({'os-extend': kwargs})
         url = 'volumes/%s/action' % (volume_id)
         resp, body = self.post(url, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.extend_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def reset_volume_status(self, volume_id, **kwargs):
@@ -249,7 +256,7 @@
         """
         post_body = json.dumps({'os-reset_status': kwargs})
         resp, body = self.post('volumes/%s/action' % volume_id, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.reset_volume_status, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def update_volume_readonly(self, volume_id, **kwargs):
@@ -262,14 +269,14 @@
         post_body = json.dumps({'os-update_readonly_flag': kwargs})
         url = 'volumes/%s/action' % (volume_id)
         resp, body = self.post(url, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.update_volume_readonly, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def force_delete_volume(self, volume_id):
         """Force Delete Volume."""
         post_body = json.dumps({'os-force_delete': {}})
         resp, body = self.post('volumes/%s/action' % volume_id, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.force_delete_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def create_volume_metadata(self, volume_id, metadata):
@@ -283,7 +290,7 @@
         url = "volumes/%s/metadata" % volume_id
         resp, body = self.post(url, put_body)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.create_volume_metadata, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def show_volume_metadata(self, volume_id):
@@ -291,7 +298,7 @@
         url = "volumes/%s/metadata" % volume_id
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_volume_metadata, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def update_volume_metadata(self, volume_id, metadata):
@@ -305,7 +312,7 @@
         url = "volumes/%s/metadata" % volume_id
         resp, body = self.put(url, put_body)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.update_volume_metadata, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def show_volume_metadata_item(self, volume_id, id):
@@ -313,7 +320,7 @@
         url = "volumes/%s/metadata/%s" % (volume_id, id)
         resp, body = self.get(url)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_volume_metadata_item, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def update_volume_metadata_item(self, volume_id, id, meta_item):
@@ -322,14 +329,14 @@
         url = "volumes/%s/metadata/%s" % (volume_id, id)
         resp, body = self.put(url, put_body)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.update_volume_metadata_item, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def delete_volume_metadata_item(self, volume_id, id):
         """Delete metadata item for the volume."""
         url = "volumes/%s/metadata/%s" % (volume_id, id)
         resp, body = self.delete(url)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.delete_volume_metadata_item, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def retype_volume(self, volume_id, **kwargs):
@@ -341,7 +348,7 @@
         """
         post_body = json.dumps({'os-retype': kwargs})
         resp, body = self.post('volumes/%s/action' % volume_id, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.retype_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def force_detach_volume(self, volume_id, **kwargs):
@@ -354,7 +361,7 @@
         post_body = json.dumps({'os-force_detach': kwargs})
         url = 'volumes/%s/action' % volume_id
         resp, body = self.post(url, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.force_detach_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def update_volume_image_metadata(self, volume_id, **kwargs):
@@ -368,7 +375,7 @@
         url = "volumes/%s/action" % (volume_id)
         resp, body = self.post(url, post_body)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.update_volume_image_metadata, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def delete_volume_image_metadata(self, volume_id, key_name):
@@ -376,7 +383,7 @@
         post_body = json.dumps({'os-unset_image_metadata': {'key': key_name}})
         url = "volumes/%s/action" % (volume_id)
         resp, body = self.post(url, post_body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.delete_volume_image_metadata, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def show_volume_image_metadata(self, volume_id):
@@ -385,7 +392,7 @@
         url = "volumes/%s/action" % volume_id
         resp, body = self.post(url, post_body)
         body = json.loads(body)
-        self.expected_success(200, resp.status)
+        self.validate_response(schema.show_volume_image_metadata, resp, body)
         return rest_client.ResponseBody(resp, body)
 
     def unmanage_volume(self, volume_id):
@@ -397,5 +404,5 @@
         """
         post_body = json.dumps({'os-unmanage': {}})
         resp, body = self.post('volumes/%s/action' % volume_id, post_body)
-        self.expected_success(202, resp.status)
+        self.validate_response(schema.unmanage_volume, resp, body)
         return rest_client.ResponseBody(resp, body)
diff --git a/tempest/manager.py b/tempest/manager.py
index e3174d4..b485ef2 100644
--- a/tempest/manager.py
+++ b/tempest/manager.py
@@ -33,7 +33,7 @@
 
     def __init__(self, credentials, scope='project'):
         msg = ("tempest.manager.Manager is not a stable interface and as such "
-               "it should not imported directly. It will be removed as "
+               "it should not be imported directly. It will be removed as "
                "soon as the client manager becomes available in tempest.lib.")
         LOG.warning(msg)
         dscv = CONF.identity.disable_ssl_certificate_validation
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 8591771..ff860d5 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -14,6 +14,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import os
 import subprocess
 
 import netaddr
@@ -90,10 +91,32 @@
             volume_microversion=self.volume_request_microversion,
             placement_microversion=self.placement_request_microversion))
 
+    def setup_compute_client(cls):
+        """Compute and Compute security groups client"""
+        cls.compute_images_client = cls.os_primary.compute_images_client
+        cls.keypairs_client = cls.os_primary.keypairs_client
+        cls.compute_security_groups_client = (
+            cls.os_primary.compute_security_groups_client)
+        cls.compute_security_group_rules_client = (
+            cls.os_primary.compute_security_group_rules_client)
+        cls.servers_client = cls.os_primary.servers_client
+        cls.interface_client = cls.os_primary.interfaces_client
+
+    def setup_network_client(cls):
+        """Neutron network client"""
+        cls.networks_client = cls.os_primary.networks_client
+        cls.ports_client = cls.os_primary.ports_client
+        cls.routers_client = cls.os_primary.routers_client
+        cls.subnets_client = cls.os_primary.subnets_client
+        cls.floating_ips_client = cls.os_primary.floating_ips_client
+        cls.security_groups_client = cls.os_primary.security_groups_client
+        cls.security_group_rules_client = (
+            cls.os_primary.security_group_rules_client)
+
     @classmethod
     def setup_clients(cls):
+        """This setup the service clients for the tests"""
         super(ScenarioTest, cls).setup_clients()
-        # Clients (in alphabetical order)
         cls.flavors_client = cls.os_primary.flavors_client
         cls.compute_floating_ips_client = (
             cls.os_primary.compute_floating_ips_client)
@@ -107,37 +130,20 @@
                 raise lib_exc.InvalidConfiguration(
                     'Either api_v1 or api_v2 must be True in '
                     '[image-feature-enabled].')
-        # Compute image client
-        cls.compute_images_client = cls.os_primary.compute_images_client
-        cls.keypairs_client = cls.os_primary.keypairs_client
-        # Nova security groups client
-        cls.compute_security_groups_client = (
-            cls.os_primary.compute_security_groups_client)
-        cls.compute_security_group_rules_client = (
-            cls.os_primary.compute_security_group_rules_client)
-        cls.servers_client = cls.os_primary.servers_client
-        cls.interface_client = cls.os_primary.interfaces_client
-        # Neutron network client
-        cls.networks_client = cls.os_primary.networks_client
-        cls.ports_client = cls.os_primary.ports_client
-        cls.routers_client = cls.os_primary.routers_client
-        cls.subnets_client = cls.os_primary.subnets_client
-        cls.floating_ips_client = cls.os_primary.floating_ips_client
-        cls.security_groups_client = cls.os_primary.security_groups_client
-        cls.security_group_rules_client = (
-            cls.os_primary.security_group_rules_client)
-        # Use the latest available volume clients
+
+        cls.setup_compute_client(cls)
+        cls.setup_network_client(cls)
         if CONF.service_available.cinder:
             cls.volumes_client = cls.os_primary.volumes_client_latest
             cls.snapshots_client = cls.os_primary.snapshots_client_latest
             cls.backups_client = cls.os_primary.backups_client_latest
 
     # ## Test functions library
-    #
     # The create_[resource] functions only return body and discard the
     # resp part which is not used in scenario tests
 
     def create_port(self, network_id, client=None, **kwargs):
+        """Creates port"""
         if not client:
             client = self.ports_client
         name = data_utils.rand_name(self.__class__.__name__)
@@ -155,6 +161,13 @@
         return port
 
     def create_keypair(self, client=None):
+        """Creates keypair
+
+        Keypair is a public key of OpenSSH key pair used for accessing
+        and create servers
+        Keypair can also be created by a private key for the same purpose
+        Here, the keys are randomly generated[public/private]
+        """
         if not client:
             client = self.keypairs_client
         name = data_utils.rand_name(self.__class__.__name__)
@@ -294,6 +307,13 @@
 
     def create_volume(self, size=None, name=None, snapshot_id=None,
                       imageRef=None, volume_type=None):
+        """Creates volume
+
+        This wrapper utility creates volume and waits for volume to be
+        in 'available' state.
+        This method returns the volume's full representation by GET request.
+        """
+
         if size is None:
             size = CONF.volume.volume_size
         if imageRef:
@@ -333,6 +353,11 @@
     def create_backup(self, volume_id, name=None, description=None,
                       force=False, snapshot_id=None, incremental=False,
                       container=None):
+        """Creates backup
+
+        This wrapper utility creates backup and waits for backup to be
+        in 'available' state.
+        """
 
         name = name or data_utils.rand_name(
             self.__class__.__name__ + "-backup")
@@ -350,6 +375,12 @@
         return backup
 
     def restore_backup(self, backup_id):
+        """Restore backup
+
+        This wrapper utility restores backup and waits for backup to be
+        in 'available' state.
+        """
+
         restore = self.backups_client.restore_backup(backup_id)['restore']
         self.addCleanup(self.volumes_client.delete_volume,
                         restore['volume_id'])
@@ -361,8 +392,31 @@
         self.assertEqual(backup_id, restore['backup_id'])
         return restore
 
+    def rebuild_server(self, server_id, image=None,
+                       preserve_ephemeral=False, wait=True,
+                       rebuild_kwargs=None):
+        if image is None:
+            image = CONF.compute.image_ref
+        rebuild_kwargs = rebuild_kwargs or {}
+        LOG.debug("Rebuilding server (id: %s, image: %s, preserve eph: %s)",
+                  server_id, image, preserve_ephemeral)
+        self.servers_client.rebuild_server(
+            server_id=server_id,
+            image_ref=image,
+            preserve_ephemeral=preserve_ephemeral,
+            **rebuild_kwargs)
+        if wait:
+            waiters.wait_for_server_status(self.servers_client,
+                                           server_id, 'ACTIVE')
+
     def create_volume_snapshot(self, volume_id, name=None, description=None,
                                metadata=None, force=False):
+        """Creates volume
+
+        This wrapper utility creates volume snapshot and waits for backup
+        to be in 'available' state.
+        """
+
         name = name or data_utils.rand_name(
             self.__class__.__name__ + '-snapshot')
         snapshot = self.snapshots_client.create_snapshot(
@@ -371,6 +425,7 @@
             display_name=name,
             description=description,
             metadata=metadata)['snapshot']
+
         self.addCleanup(self.snapshots_client.wait_for_resource_deletion,
                         snapshot['id'])
         self.addCleanup(self.snapshots_client.delete_snapshot, snapshot['id'])
@@ -400,6 +455,23 @@
         admin_volume_type_client.delete_volume_type(volume_type['id'])
 
     def create_volume_type(self, client=None, name=None, backend_name=None):
+        """Creates volume type
+
+        In a multiple-storage back-end configuration,
+        each back end has a name (volume_backend_name).
+        The name of the back end is declared as an extra-specification
+        of a volume type (such as, volume_backend_name=LVM).
+        When a volume is created, the scheduler chooses an
+        appropriate back end to handle the request, according
+        to the volume type specified by the user.
+        The scheduler uses volume types to explicitly create volumes on
+        specific back ends.
+
+        Before using volume type, a volume type has to be declared
+        to Block Storage. In addition to that, an extra-specification
+        has to be created to link the volume type to a back end name.
+        """
+
         if not client:
             client = self.os_admin.volume_types_client_latest
         if not name:
@@ -415,6 +487,7 @@
 
         volume_type = client.create_volume_type(
             name=randomized_name, extra_specs=extra_specs)['volume_type']
+        self.assertIn('id', volume_type)
         self.addCleanup(self._cleanup_volume_type, volume_type)
         return volume_type
 
@@ -455,7 +528,7 @@
         return rules
 
     def _create_security_group(self):
-        # Create security group
+        """Create security group and add rules to security group"""
         sg_name = data_utils.rand_name(self.__class__.__name__)
         sg_desc = sg_name + " description"
         secgroup = self.compute_security_groups_client.create_security_group(
@@ -469,7 +542,6 @@
 
         # Add rules to the security group
         self._create_loginable_secgroup_rule(secgroup['id'])
-
         return secgroup
 
     def get_remote_client(self, ip_address, username=None, private_key=None,
@@ -501,68 +573,60 @@
         linux_client.validate_authentication()
         return linux_client
 
-    def _image_create(self, name, fmt, path,
-                      disk_format=None, properties=None):
-        if properties is None:
-            properties = {}
-        name = data_utils.rand_name('%s-' % name)
-        params = {
-            'name': name,
-            'container_format': fmt,
-            'disk_format': disk_format or fmt,
-        }
-        if CONF.image_feature_enabled.api_v1:
-            params['is_public'] = 'False'
-            params['properties'] = properties
-            params = {'headers': common_image.image_meta_to_headers(**params)}
-        else:
-            params['visibility'] = 'private'
-            # Additional properties are flattened out in the v2 API.
-            params.update(properties)
-        body = self.image_client.create_image(**params)
-        image = body['image'] if 'image' in body else body
-        self.addCleanup(self.image_client.delete_image, image['id'])
-        self.assertEqual("queued", image['status'])
-        with open(path, 'rb') as image_file:
-            if CONF.image_feature_enabled.api_v1:
-                self.image_client.update_image(image['id'], data=image_file)
-            else:
-                self.image_client.store_image_file(image['id'], image_file)
-        return image['id']
-
-    def glance_image_create(self):
-        img_path = CONF.scenario.img_dir + "/" + CONF.scenario.img_file
-        aki_img_path = CONF.scenario.img_dir + "/" + CONF.scenario.aki_img_file
-        ari_img_path = CONF.scenario.img_dir + "/" + CONF.scenario.ari_img_file
-        ami_img_path = CONF.scenario.img_dir + "/" + CONF.scenario.ami_img_file
+    def image_create(self, name='scenario-img'):
+        img_path = CONF.scenario.img_file
+        if not os.path.exists(img_path):
+            # TODO(kopecmartin): replace LOG.warning for rasing
+            # InvalidConfiguration exception after tempest 25.0.0 is
+            # released - there will be one release which accepts both
+            # behaviors in order to avoid many failures across CIs and etc.
+            LOG.warning(
+                'Starting Tempest 25.0.0 release, CONF.scenario.img_file need '
+                'a full path for the image. CONF.scenario.img_dir was '
+                'deprecated and will be removed in the next release. Till '
+                'Tempest 25.0.0, old behavior is maintained and keep working '
+                'but starting Tempest 26.0.0, you need to specify the full '
+                'path in CONF.scenario.img_file config option.')
+            img_path = os.path.join(CONF.scenario.img_dir, img_path)
         img_container_format = CONF.scenario.img_container_format
         img_disk_format = CONF.scenario.img_disk_format
         img_properties = CONF.scenario.img_properties
         LOG.debug("paths: img: %s, container_format: %s, disk_format: %s, "
-                  "properties: %s, ami: %s, ari: %s, aki: %s",
+                  "properties: %s",
                   img_path, img_container_format, img_disk_format,
-                  img_properties, ami_img_path, ari_img_path, aki_img_path)
-        try:
-            image = self._image_create('scenario-img',
-                                       img_container_format,
-                                       img_path,
-                                       disk_format=img_disk_format,
-                                       properties=img_properties)
-        except IOError:
-            LOG.warning(
-                "A(n) %s image was not found. Retrying with uec image.",
-                img_disk_format)
-            kernel = self._image_create('scenario-aki', 'aki', aki_img_path)
-            ramdisk = self._image_create('scenario-ari', 'ari', ari_img_path)
-            properties = {'kernel_id': kernel, 'ramdisk_id': ramdisk}
-            image = self._image_create('scenario-ami', 'ami',
-                                       path=ami_img_path,
-                                       properties=properties)
-        LOG.debug("image:%s", image)
-
-        return image
+                  img_properties)
+        if img_properties is None:
+            img_properties = {}
+        name = data_utils.rand_name('%s-' % name)
+        params = {
+            'name': name,
+            'container_format': img_container_format,
+            'disk_format': img_disk_format or img_container_format,
+        }
+        if CONF.image_feature_enabled.api_v1:
+            params['is_public'] = 'False'
+            if img_properties:
+                params['properties'] = img_properties
+            params = {'headers': common_image.image_meta_to_headers(**params)}
+        else:
+            params['visibility'] = 'private'
+            # Additional properties are flattened out in the v2 API.
+            if img_properties:
+                params.update(img_properties)
+        body = self.image_client.create_image(**params)
+        image = body['image'] if 'image' in body else body
+        self.addCleanup(self.image_client.delete_image, image['id'])
+        self.assertEqual("queued", image['status'])
+        with open(img_path, 'rb') as image_file:
+            if CONF.image_feature_enabled.api_v1:
+                self.image_client.update_image(image['id'], data=image_file)
+            else:
+                self.image_client.store_image_file(image['id'], image_file)
+        LOG.debug("image:%s", image['id'])
+        return image['id']
 
     def _log_console_output(self, servers=None, client=None):
+        """Console log output"""
         if not CONF.compute_feature_enabled.console_output:
             LOG.debug('Console output not supported, cannot log')
             return
@@ -581,11 +645,12 @@
                           "for the console log", server['id'])
 
     def _log_net_info(self, exc):
-        # network debug is called as part of ssh init
+        """network debug is called as part of ssh init"""
         if not isinstance(exc, lib_exc.SSHTimeout):
             LOG.debug('Network information on a devstack host')
 
     def create_server_snapshot(self, server, name=None):
+        """Creates server snapshot"""
         # Glance client
         _image_client = self.image_client
         # Compute client
@@ -603,7 +668,7 @@
                         _image_client.delete_image, image_id)
 
         if CONF.image_feature_enabled.api_v1:
-            # In glance v1 the additional properties are stored in the headers.
+            # In glance v1 the additional properties are stored in the headers
             resp = _image_client.check_image(image_id)
             snapshot_image = common_image.get_image_meta_from_headers(resp)
             image_props = snapshot_image.get('properties', {})
@@ -633,22 +698,34 @@
         return snapshot_image
 
     def nova_volume_attach(self, server, volume_to_attach):
+        """Compute volume attach
+
+        This utility attaches volume from compute and waits for the
+        volume status to be 'in-use' state.
+        """
         volume = self.servers_client.attach_volume(
             server['id'], volumeId=volume_to_attach['id'])['volumeAttachment']
         self.assertEqual(volume_to_attach['id'], volume['id'])
         waiters.wait_for_volume_resource_status(self.volumes_client,
                                                 volume['id'], 'in-use')
-
         # Return the updated volume after the attachment
         return self.volumes_client.show_volume(volume['id'])['volume']
 
     def nova_volume_detach(self, server, volume):
+        """Compute volume detach
+
+        This utility detaches volume from compute and check whether the
+        volume status is 'available' state, and if not, an exception
+        will be thrown.
+        """
         self.servers_client.detach_volume(server['id'], volume['id'])
         waiters.wait_for_volume_resource_status(self.volumes_client,
                                                 volume['id'], 'available')
+        volume = self.volumes_client.show_volume(volume['id'])['volume']
 
     def ping_ip_address(self, ip_address, should_succeed=True,
                         ping_timeout=None, mtu=None, server=None):
+        """ping ip address"""
         timeout = ping_timeout or CONF.validation.ping_timeout
         cmd = ['ping', '-c1', '-w1']
 
@@ -709,6 +786,7 @@
         :raises: AssertError if the result of the connectivity check does
             not match the value of the should_connect param
         """
+
         LOG.debug('checking network connections to IP %s with user: %s',
                   ip_address, username)
         if should_connect:
@@ -732,7 +810,7 @@
                 LOG.exception(extra_msg)
                 raise
 
-    def create_floating_ip(self, thing, pool_name=None):
+    def create_floating_ip(self, server, pool_name=None):
         """Create a floating IP and associates to a server on Nova"""
 
         if not pool_name:
@@ -743,11 +821,17 @@
                         self.compute_floating_ips_client.delete_floating_ip,
                         floating_ip['id'])
         self.compute_floating_ips_client.associate_floating_ip_to_server(
-            floating_ip['ip'], thing['id'])
+            floating_ip['ip'], server['id'])
         return floating_ip
 
     def create_timestamp(self, ip_address, dev_name=None, mount_path='/mnt',
                          private_key=None, server=None):
+        """Creates timestamp
+
+        This wrapper utility does ssh, creates timestamp and returns the
+        created timestamp.
+        """
+
         ssh_client = self.get_remote_client(ip_address,
                                             private_key=private_key,
                                             server=server)
@@ -765,6 +849,11 @@
 
     def get_timestamp(self, ip_address, dev_name=None, mount_path='/mnt',
                       private_key=None, server=None):
+        """Returns timestamp
+
+        This wrapper utility does ssh and returns the timestamp.
+        """
+
         ssh_client = self.get_remote_client(ip_address,
                                             private_key=private_key,
                                             server=server)
@@ -782,6 +871,7 @@
         Based on the configuration we're in, return a correct ip
         address for validating that a guest is up.
         """
+
         if CONF.validation.connect_method == 'floating':
             # The tests calling this method don't have a floating IP
             # and can't make use of the validation resources. So the
@@ -807,6 +897,8 @@
 
     @classmethod
     def get_host_for_server(cls, server_id):
+        """Gets host of server"""
+
         server_details = cls.os_admin.servers_client.show_server(server_id)
         return server_details['server']['OS-EXT-SRV-ATTR:host']
 
@@ -825,6 +917,12 @@
                                     security_group=None,
                                     delete_on_termination=False,
                                     name=None):
+        """Boot instance from resource
+
+        This wrapper utility boots instance from resource with block device
+        mapping with source info passed in arguments
+        """
+
         create_kwargs = dict()
         if keypair:
             create_kwargs['key_name'] = keypair['name']
@@ -841,6 +939,7 @@
         return self.create_server(image_id='', **create_kwargs)
 
     def create_volume_from_image(self):
+        """Create volume from image"""
         img_uuid = CONF.compute.image_ref
         vol_name = data_utils.rand_name(
             self.__class__.__name__ + '-volume-origin')
@@ -868,15 +967,15 @@
             raise cls.skipException('Neutron not available')
 
     def _create_network(self, networks_client=None,
-                        tenant_id=None,
+                        project_id=None,
                         namestart='network-smoke-',
                         port_security_enabled=True, **net_dict):
         if not networks_client:
             networks_client = self.networks_client
-        if not tenant_id:
-            tenant_id = networks_client.tenant_id
+        if not project_id:
+            project_id = networks_client.project_id
         name = data_utils.rand_name(namestart)
-        network_kwargs = dict(name=name, tenant_id=tenant_id)
+        network_kwargs = dict(name=name, project_id=project_id)
         if net_dict:
             network_kwargs.update(net_dict)
         # Neutron disables port security by default so we have to check the
@@ -896,19 +995,28 @@
                       namestart='subnet-smoke', **kwargs):
         """Create a subnet for the given network
 
+        This utility creates subnet for the given network
         within the cidr block configured for tenant networks.
+
+        :param **kwargs:
+            See extra parameters below
+
+        :Keyword Arguments:
+
+            * *ip_version = ip version of the given network,
         """
+
         if not subnets_client:
             subnets_client = self.subnets_client
 
-        def cidr_in_use(cidr, tenant_id):
+        def cidr_in_use(cidr, project_id):
             """Check cidr existence
 
             :returns: True if subnet with cidr already exist in tenant
                   False else
             """
             cidr_in_use = self.os_admin.subnets_client.list_subnets(
-                tenant_id=tenant_id, cidr=cidr)['subnets']
+                project_id=project_id, cidr=cidr)['subnets']
             return len(cidr_in_use) != 0
 
         ip_version = kwargs.pop('ip_version', 4)
@@ -927,13 +1035,13 @@
         # blocks until an unallocated block is found.
         for subnet_cidr in tenant_cidr.subnet(num_bits):
             str_cidr = str(subnet_cidr)
-            if cidr_in_use(str_cidr, tenant_id=network['tenant_id']):
+            if cidr_in_use(str_cidr, project_id=network['project_id']):
                 continue
 
             subnet = dict(
                 name=data_utils.rand_name(namestart),
                 network_id=network['id'],
-                tenant_id=network['tenant_id'],
+                project_id=network['project_id'],
                 cidr=str_cidr,
                 ip_version=ip_version,
                 **kwargs
@@ -1000,22 +1108,23 @@
                             "Unable to get network by name: %s" % network_name)
         return net[0]
 
-    def create_floating_ip(self, thing, external_network_id=None,
+    def create_floating_ip(self, server, external_network_id=None,
                            port_id=None, client=None):
         """Create a floating IP and associates to a resource/port on Neutron"""
+
         if not external_network_id:
             external_network_id = CONF.network.public_network_id
         if not client:
             client = self.floating_ips_client
         if not port_id:
-            port_id, ip4 = self._get_server_port_id_and_ip4(thing)
+            port_id, ip4 = self._get_server_port_id_and_ip4(server)
         else:
             ip4 = None
 
         kwargs = {
             'floating_network_id': external_network_id,
             'port_id': port_id,
-            'tenant_id': thing['tenant_id'],
+            'tenant_id': server.get('project_id') or server['tenant_id'],
             'fixed_ip_address': ip4,
         }
         if CONF.network.subnet_id:
@@ -1035,6 +1144,7 @@
         :param status: target status
         :raises: AssertionError if status doesn't match
         """
+
         floatingip_id = floating_ip['id']
 
         def refresh():
@@ -1061,6 +1171,7 @@
                                           private_key,
                                           should_connect=True,
                                           servers_for_debug=None):
+        """Checks tenant network connectivity"""
         if not CONF.network.project_networks_reachable:
             msg = 'Tenant networks not configured to be reachable.'
             LOG.info(msg)
@@ -1093,6 +1204,7 @@
         :returns: True, if the connection succeeded and it was expected to
             succeed. False otherwise.
         """
+
         method_name = '%s_check' % protocol
         connectivity_checker = getattr(source, method_name)
 
@@ -1122,18 +1234,18 @@
         self.fail(msg)
 
     def _create_security_group(self, security_group_rules_client=None,
-                               tenant_id=None,
+                               project_id=None,
                                namestart='secgroup-smoke',
                                security_groups_client=None):
         if security_group_rules_client is None:
             security_group_rules_client = self.security_group_rules_client
         if security_groups_client is None:
             security_groups_client = self.security_groups_client
-        if tenant_id is None:
-            tenant_id = security_groups_client.tenant_id
+        if project_id is None:
+            project_id = security_groups_client.project_id
         secgroup = self._create_empty_security_group(
             namestart=namestart, client=security_groups_client,
-            tenant_id=tenant_id)
+            project_id=project_id)
 
         # Add rules to the security group
         rules = self._create_loginable_secgroup_rule(
@@ -1141,11 +1253,11 @@
             secgroup=secgroup,
             security_groups_client=security_groups_client)
         for rule in rules:
-            self.assertEqual(tenant_id, rule['tenant_id'])
+            self.assertEqual(project_id, rule['project_id'])
             self.assertEqual(secgroup['id'], rule['security_group_id'])
         return secgroup
 
-    def _create_empty_security_group(self, client=None, tenant_id=None,
+    def _create_empty_security_group(self, client=None, project_id=None,
                                      namestart='secgroup-smoke'):
         """Create a security group without rules.
 
@@ -1153,23 +1265,24 @@
          - IPv4 egress to any
          - IPv6 egress to any
 
-        :param tenant_id: secgroup will be created in this tenant
+        :param project_id: secgroup will be created in this project
         :returns: the created security group
         """
+
         if client is None:
             client = self.security_groups_client
-        if not tenant_id:
-            tenant_id = client.tenant_id
+        if not project_id:
+            project_id = client.project_id
         sg_name = data_utils.rand_name(namestart)
         sg_desc = sg_name + " description"
         sg_dict = dict(name=sg_name,
                        description=sg_desc)
-        sg_dict['tenant_id'] = tenant_id
+        sg_dict['project_id'] = project_id
         result = client.create_security_group(**sg_dict)
 
         secgroup = result['security_group']
         self.assertEqual(secgroup['name'], sg_name)
-        self.assertEqual(tenant_id, secgroup['tenant_id'])
+        self.assertEqual(project_id, secgroup['project_id'])
         self.assertEqual(secgroup['description'], sg_desc)
 
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
@@ -1178,15 +1291,15 @@
 
     def _create_security_group_rule(self, secgroup=None,
                                     sec_group_rules_client=None,
-                                    tenant_id=None,
+                                    project_id=None,
                                     security_groups_client=None, **kwargs):
         """Create a rule from a dictionary of rule parameters.
 
         Create a rule in a secgroup. if secgroup not defined will search for
-        default secgroup in tenant_id.
+        default secgroup in project_id.
 
         :param secgroup: the security group.
-        :param tenant_id: if secgroup not passed -- the tenant in which to
+        :param project_id: if secgroup not passed -- the tenant in which to
             search for default secgroup
         :param kwargs: a dictionary containing rule parameters:
             for example, to allow incoming ssh:
@@ -1197,22 +1310,23 @@
                     port_range_max: 22
                     }
         """
+
         if sec_group_rules_client is None:
             sec_group_rules_client = self.security_group_rules_client
         if security_groups_client is None:
             security_groups_client = self.security_groups_client
-        if not tenant_id:
-            tenant_id = security_groups_client.tenant_id
+        if not project_id:
+            project_id = security_groups_client.project_id
         if secgroup is None:
-            # Get default secgroup for tenant_id
+            # Get default secgroup for project_id
             default_secgroups = security_groups_client.list_security_groups(
-                name='default', tenant_id=tenant_id)['security_groups']
-            msg = "No default security group for tenant %s." % (tenant_id)
+                name='default', project_id=project_id)['security_groups']
+            msg = "No default security group for project %s." % (project_id)
             self.assertNotEmpty(default_secgroups, msg)
             secgroup = default_secgroups[0]
 
         ruleset = dict(security_group_id=secgroup['id'],
-                       tenant_id=secgroup['tenant_id'])
+                       project_id=secgroup['project_id'])
         ruleset.update(kwargs)
 
         sg_rule = sec_group_rules_client.create_security_group_rule(**ruleset)
@@ -1278,7 +1392,7 @@
 
         return rules
 
-    def _get_router(self, client=None, tenant_id=None):
+    def _get_router(self, client=None, project_id=None):
         """Retrieve a router for the given tenant id.
 
         If a public router has been configured, it will be returned.
@@ -1287,10 +1401,11 @@
         network has, a tenant router will be created and returned that
         routes traffic to the public network.
         """
+
         if not client:
             client = self.routers_client
-        if not tenant_id:
-            tenant_id = client.tenant_id
+        if not project_id:
+            project_id = client.project_id
         router_id = CONF.network.public_router_id
         network_id = CONF.network.public_network_id
         if router_id:
@@ -1300,7 +1415,7 @@
             router = client.create_router(
                 name=data_utils.rand_name(self.__class__.__name__ + '-router'),
                 admin_state_up=True,
-                tenant_id=tenant_id,
+                project_id=project_id,
                 external_gateway_info=dict(network_id=network_id))['router']
             self.addCleanup(test_utils.call_and_ignore_notfound_exc,
                             client.delete_router, router['id'])
@@ -1311,14 +1426,14 @@
 
     def create_networks(self, networks_client=None,
                         routers_client=None, subnets_client=None,
-                        tenant_id=None, dns_nameservers=None,
+                        project_id=None, dns_nameservers=None,
                         port_security_enabled=True, **net_dict):
         """Create a network with a subnet connected to a router.
 
         The baremetal driver is a special case since all nodes are
         on the same shared network.
 
-        :param tenant_id: id of tenant to create resources in.
+        :param project_id: id of project to create resources in.
         :param dns_nameservers: list of dns servers to send to subnet.
         :param port_security_enabled: whether or not port_security is enabled
         :param net_dict: a dict containing experimental network information in
@@ -1327,6 +1442,7 @@
                                    'provider:segmentation_id': '42'}
         :returns: network, subnet, router
         """
+
         if CONF.network.shared_physical_network:
             # NOTE(Shrews): This exception is for environments where tenant
             # credential isolation is available, but network separation is
@@ -1343,11 +1459,11 @@
         else:
             network = self._create_network(
                 networks_client=networks_client,
-                tenant_id=tenant_id,
+                project_id=project_id,
                 port_security_enabled=port_security_enabled,
                 **net_dict)
             router = self._get_router(client=routers_client,
-                                      tenant_id=tenant_id)
+                                      project_id=project_id)
             subnet_kwargs = dict(network=network,
                                  subnets_client=subnets_client)
             # use explicit check because empty list is a valid option
@@ -1383,6 +1499,7 @@
     def create_encryption_type(self, client=None, type_id=None, provider=None,
                                key_size=None, cipher=None,
                                control_location=None):
+        """Creates an encryption type for volume"""
         if not client:
             client = self.admin_encryption_types_client
         if not type_id:
@@ -1396,6 +1513,7 @@
     def create_encrypted_volume(self, encryption_provider, volume_type,
                                 key_size=256, cipher='aes-xts-plain64',
                                 control_location='front-end'):
+        """Creates an encrypted volume"""
         volume_type = self.create_volume_type(name=volume_type)
         self.create_encryption_type(type_id=volume_type['id'],
                                     provider=encryption_provider,
@@ -1436,11 +1554,12 @@
         cls.object_client = cls.os_operator.object_client
 
     def get_swift_stat(self):
-        """get swift status for our user account."""
+        """Get swift status for our user account."""
         self.account_client.list_account_containers()
         LOG.debug('Swift status information obtained successfully')
 
     def create_container(self, container_name=None):
+        """Creates container"""
         name = container_name or data_utils.rand_name(
             'swift-scenario-container')
         self.container_client.update_container(name)
@@ -1453,10 +1572,12 @@
         return name
 
     def delete_container(self, container_name):
+        """Deletes container"""
         self.container_client.delete_container(container_name)
         LOG.debug('Container %s deleted', container_name)
 
     def upload_object_to_container(self, container_name, obj_name=None):
+        """Uploads object to container"""
         obj_name = obj_name or data_utils.rand_name('swift-scenario-object')
         obj_data = data_utils.random_bytes()
         self.object_client.create_object(container_name, obj_name, obj_data)
@@ -1467,6 +1588,7 @@
         return obj_name, obj_data
 
     def delete_object(self, container_name, filename):
+        """Deletes object"""
         self.object_client.delete_object(container_name, filename)
         self.list_and_check_container_objects(container_name,
                                               not_present_obj=[filename])
@@ -1474,8 +1596,13 @@
     def list_and_check_container_objects(self, container_name,
                                          present_obj=None,
                                          not_present_obj=None):
-        # List objects for a given container and assert which are present and
-        # which are not.
+        """List and verify objects for a given container
+
+        This utility lists objects for a given container
+        and asserts which are present and
+        which are not
+        """
+
         if present_obj is None:
             present_obj = []
         if not_present_obj is None:
@@ -1490,5 +1617,6 @@
                 self.assertNotIn(obj, object_list)
 
     def download_and_verify(self, container_name, obj_name, expected_data):
+        """Asserts the object and expected data to verify if they are same"""
         _, obj = self.object_client.get_object(container_name, obj_name)
         self.assertEqual(obj, expected_data)
diff --git a/tempest/scenario/test_encrypted_cinder_volumes.py b/tempest/scenario/test_encrypted_cinder_volumes.py
index 008d1ae..fc93a5e 100644
--- a/tempest/scenario/test_encrypted_cinder_volumes.py
+++ b/tempest/scenario/test_encrypted_cinder_volumes.py
@@ -44,7 +44,7 @@
             raise cls.skipException('Encrypted volume attach is not supported')
 
     def launch_instance(self):
-        image = self.glance_image_create()
+        image = self.image_create()
         keypair = self.create_keypair()
 
         return self.create_server(image_id=image, key_name=keypair['name'])
diff --git a/tempest/scenario/test_minbw_allocation_placement.py b/tempest/scenario/test_minbw_allocation_placement.py
index e7085f6..5eab1da 100644
--- a/tempest/scenario/test_minbw_allocation_placement.py
+++ b/tempest/scenario/test_minbw_allocation_placement.py
@@ -124,8 +124,11 @@
             resources1='%s:%s' % (self.INGRESS_RESOURCE_CLASS,
                                   self.SMALLEST_POSSIBLE_BW))
         if len(alloc_candidates['provider_summaries']) == 0:
-            self.fail('No allocation candidates are available for %s:%s' %
-                      (self.INGRESS_RESOURCE_CLASS, self.SMALLEST_POSSIBLE_BW))
+            # Skip if the backend does not support QoS minimum bandwidth
+            # allocation in Placement API
+            raise self.skipException(
+                'No allocation candidates are available for %s:%s' %
+                (self.INGRESS_RESOURCE_CLASS, self.SMALLEST_POSSIBLE_BW))
 
         # Just to be sure check with impossible high (placement max_int),
         # allocation
diff --git a/tempest/scenario/test_minimum_basic.py b/tempest/scenario/test_minimum_basic.py
index 4cd860d..fe42583 100644
--- a/tempest/scenario/test_minimum_basic.py
+++ b/tempest/scenario/test_minimum_basic.py
@@ -106,7 +106,7 @@
     @decorators.idempotent_id('bdbb5441-9204-419d-a225-b4fdbfb1a1a8')
     @utils.services('compute', 'volume', 'image', 'network')
     def test_minimum_basic_scenario(self):
-        image = self.glance_image_create()
+        image = self.image_create()
         keypair = self.create_keypair()
 
         server = self.create_server(image_id=image, key_name=keypair['name'])
diff --git a/tempest/scenario/test_network_advanced_server_ops.py b/tempest/scenario/test_network_advanced_server_ops.py
index b1919d4..e26dc9d 100644
--- a/tempest/scenario/test_network_advanced_server_ops.py
+++ b/tempest/scenario/test_network_advanced_server_ops.py
@@ -262,7 +262,7 @@
         self._wait_server_status_and_check_network_connectivity(
             server, keypair, floating_ip)
 
-    @decorators.skip_because(bug='1836595')
+    @decorators.unstable_test(bug='1836595')
     @decorators.idempotent_id('25b188d7-0183-4b1e-a11d-15840c8e2fd6')
     @testtools.skipUnless(CONF.compute_feature_enabled.cold_migration,
                           'Cold migration is not available.')
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index d8584ec..6c1b3fa 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -297,9 +297,19 @@
         ip_mask = CONF.network.project_network_mask_bits
         # check if the address is not already in use, if not, set it
         if ' ' + ip_address + '/' + str(ip_mask) not in ip_output:
-            ssh_client.exec_command("sudo ip addr add %s/%s dev %s" % (
-                                    ip_address, ip_mask, new_nic))
-            ssh_client.exec_command("sudo ip link set %s up" % new_nic)
+            try:
+                ssh_client.exec_command("sudo ip addr add %s/%s dev %s" % (
+                                        ip_address, ip_mask, new_nic))
+                ssh_client.exec_command("sudo ip link set %s up" % new_nic)
+            except exceptions.SSHExecCommandFailed as exc:
+                if 'RTNETLINK answers: File exists' in str(exc):
+                    LOG.debug(
+                        'IP address %(ip_address)s is already set in device '
+                        '%(device)s\nPrevious "ip a" output: %(ip_output)s',
+                        {'ip_address': ip_address, 'device': new_nic,
+                         'ip_output': ip_output})
+                else:
+                    raise exc
 
     def _get_server_nics(self, ssh_client):
         reg = re.compile(r'(?P<num>\d+): (?P<nic_name>\w+)[@]?.*:')
@@ -321,7 +331,7 @@
         internal_ips = (
             p['fixed_ips'][0]['ip_address'] for p in
             self.os_admin.ports_client.list_ports(
-                tenant_id=server['tenant_id'],
+                project_id=server['tenant_id'],
                 network_id=network['id'])['ports']
             if p['device_owner'].startswith('network') or
             p['device_owner'].startswith('compute')
diff --git a/tempest/scenario/test_network_v6.py b/tempest/scenario/test_network_v6.py
index 8de6614..14f24c7 100644
--- a/tempest/scenario/test_network_v6.py
+++ b/tempest/scenario/test_network_v6.py
@@ -130,7 +130,7 @@
             key_name=self.keypair['name'],
             security_groups=[{'name': self.sec_grp['name']}],
             networks=[{'uuid': n['id']} for n in networks])
-        fip = self.create_floating_ip(thing=srv)
+        fip = self.create_floating_ip(server=srv)
         ips = self.define_server_ips(srv=srv)
         ssh = self.get_remote_client(
             ip_address=fip['floating_ip_address'],
diff --git a/tempest/scenario/test_security_groups_basic_ops.py b/tempest/scenario/test_security_groups_basic_ops.py
index 9cbd831..3fc93e4 100644
--- a/tempest/scenario/test_security_groups_basic_ops.py
+++ b/tempest/scenario/test_security_groups_basic_ops.py
@@ -176,7 +176,7 @@
         cls.primary_tenant = cls.TenantProperties(cls.os_primary)
         cls.alt_tenant = cls.TenantProperties(cls.os_alt)
         for tenant in [cls.primary_tenant, cls.alt_tenant]:
-            cls.tenants[tenant.creds.tenant_id] = tenant
+            cls.tenants[tenant.creds.project_id] = tenant
 
         cls.floating_ip_access = not CONF.network.public_router_id
 
@@ -199,14 +199,14 @@
     def _create_tenant_security_groups(self, tenant):
         access_sg = self._create_empty_security_group(
             namestart='secgroup_access-',
-            tenant_id=tenant.creds.tenant_id,
+            project_id=tenant.creds.project_id,
             client=tenant.manager.security_groups_client
         )
 
         # don't use default secgroup since it allows in-project traffic
         def_sg = self._create_empty_security_group(
             namestart='secgroup_general-',
-            tenant_id=tenant.creds.tenant_id,
+            project_id=tenant.creds.project_id,
             client=tenant.manager.security_groups_client
         )
         tenant.security_groups.update(access=access_sg, default=def_sg)
@@ -536,7 +536,7 @@
         # Create empty security group and add icmp rule in it
         new_sg = self._create_empty_security_group(
             namestart='secgroup_new-',
-            tenant_id=new_tenant.creds.tenant_id,
+            project_id=new_tenant.creds.project_id,
             client=new_tenant.manager.security_groups_client)
         icmp_rule = dict(
             protocol='icmp',
diff --git a/tempest/test_discover/test_discover.py b/tempest/test_discover/test_discover.py
index 143c6e1..5816ab1 100644
--- a/tempest/test_discover/test_discover.py
+++ b/tempest/test_discover/test_discover.py
@@ -30,8 +30,8 @@
     base_path = os.path.split(os.path.dirname(os.path.abspath(__file__)))[0]
     base_path = os.path.split(base_path)[0]
     # Load local tempest tests
-    for test_dir in ['tempest/api', 'tempest/scenario']:
-        full_test_dir = os.path.join(base_path, test_dir)
+    for test_dir in ['api', 'scenario']:
+        full_test_dir = os.path.join(base_path, 'tempest', test_dir)
         if not pattern:
             suite.addTests(loader.discover(full_test_dir,
                                            top_level_dir=base_path))
diff --git a/tempest/tests/cmd/sample_streams/calls.subunit b/tempest/tests/cmd/subunit_describe_calls_data/calls.subunit
similarity index 100%
rename from tempest/tests/cmd/sample_streams/calls.subunit
rename to tempest/tests/cmd/subunit_describe_calls_data/calls.subunit
Binary files differ
diff --git a/tempest/tests/cmd/subunit_describe_calls_data/calls_subunit_expected.json b/tempest/tests/cmd/subunit_describe_calls_data/calls_subunit_expected.json
new file mode 100644
index 0000000..53976ee
--- /dev/null
+++ b/tempest/tests/cmd/subunit_describe_calls_data/calls_subunit_expected.json
@@ -0,0 +1,87 @@
+{"bar":[
+      {
+         "name":"AgentsAdminTestJSON:setUp",
+         "request_body":"{\"agent\": {\"url\": \"xxx://xxxx/xxx/xxx\", \"hypervisor\": \"common\", \"md5hash\": \"add6bb58e139be103324d04d82d8f545\", \"version\": \"7.0\", \"architecture\": \"tempest-x86_64-424013832\", \"os\": \"linux\"}}",
+         "request_headers":"{'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+         "response_body":"{\"agent\": {\"url\": \"xxx://xxxx/xxx/xxx\", \"hypervisor\": \"common\", \"md5hash\": \"add6bb58e139be103324d04d82d8f545\", \"version\": \"7.0\", \"architecture\": \"tempest-x86_64-424013832\", \"os\": \"linux\", \"agent_id\": 1}}",
+         "response_headers":"{'status': '200', 'content-length': '203', 'x-compute-request-id': 'req-25ddaae2-0ef1-40d1-8228-59bd64a7e75b', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': 'application/json'}",
+         "service":"Nova",
+         "status_code":"200",
+         "url":"v2.1/<id>/os-agents",
+         "verb":"POST"
+},
+      {
+         "name":"AgentsAdminTestJSON:test_create_agent",
+         "request_body":"{\"agent\": {\"url\": \"xxx://xxxx/xxx/xxx\", \"hypervisor\": \"kvm\", \"md5hash\": \"add6bb58e139be103324d04d82d8f545\", \"version\": \"7.0\", \"architecture\": \"tempest-x86-252246646\", \"os\": \"win\"}}",
+         "request_headers":"{'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+         "response_body":"{\"agent\": {\"url\": \"xxx://xxxx/xxx/xxx\", \"hypervisor\": \"kvm\", \"md5hash\": \"add6bb58e139be103324d04d82d8f545\", \"version\": \"7.0\", \"architecture\": \"tempest-x86-252246646\", \"os\": \"win\", \"agent_id\": 2}}",
+         "response_headers":"{'status': '200', 'content-length': '195', 'x-compute-request-id': 'req-b4136f06-c015-4e7e-995f-c43831e3ecce', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': 'application/json'}",
+         "service":"Nova",
+         "status_code":"200",
+         "url":"v2.1/<id>/os-agents",
+         "verb":"POST"
+},
+      {
+         "name":"AgentsAdminTestJSON:tearDown",
+         "request_body":"None",
+         "request_headers":"{'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+         "response_body":"",
+         "response_headers":"{'status': '200', 'content-length': '0', 'x-compute-request-id': 'req-ee905fd6-a5b5-4da4-8c37-5363cb25bd9d', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': 'application/json'}",
+         "service":"Nova",
+         "status_code":"200",
+         "url":"v2.1/<id>/os-agents/1",
+         "verb":"DELETE"
+},
+      {
+         "name":"AgentsAdminTestJSON:_run_cleanups",
+         "request_body":"None",
+         "request_headers":"{'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+         "response_headers":"{'status': '200', 'content-length': '0', 'x-compute-request-id': 'req-e912cac0-63e0-4679-a68a-b6d18ddca074', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': 'application/json'}",
+         "service":"Nova",
+         "status_code":"200",
+         "url":"v2.1/<id>/os-agents/2",
+         "verb":"DELETE"
+}], "foo":[
+      {
+         "name":"AgentsAdminTestJSON:setUp",
+         "request_body":"{\"agent\": {\"url\": \"xxx://xxxx/xxx/xxx\", \"hypervisor\": \"common\", \"md5hash\": \"add6bb58e139be103324d04d82d8f545\", \"version\": \"7.0\", \"architecture\": \"tempest-x86_64-948635295\", \"os\": \"linux\"}}",
+         "request_headers":"{'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+         "response_body":"{\"agent\": {\"url\": \"xxx://xxxx/xxx/xxx\", \"hypervisor\": \"common\", \"md5hash\": \"add6bb58e139be103324d04d82d8f545\", \"version\": \"7.0\", \"architecture\": \"tempest-x86_64-948635295\", \"os\": \"linux\", \"agent_id\": 3}}",
+         "response_headers":"{'status': '200', 'content-length': '203', 'x-compute-request-id': 'req-ccd2116d-04b1-4ffe-ae32-fb623f68bf1c', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': 'application/json'}",
+         "service":"Nova",
+         "status_code":"200",
+         "url":"v2.1/<id>/os-agents",
+         "verb":"POST"
+},
+      {
+         "name":"AgentsAdminTestJSON:test_delete_agent",
+         "request_body":"None",
+         "request_headers":"{'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+         "response_body":"",
+         "response_headers":"{'status': '200', 'content-length': '0', 'x-compute-request-id': 'req-6e7fa28f-ae61-4388-9a78-947c58bc0588', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': 'application/json'}",
+         "service":"Nova",
+         "status_code":"200",
+         "url":"v2.1/<id>/os-agents/3",
+         "verb":"DELETE"
+},
+      {
+         "name":"AgentsAdminTestJSON:test_delete_agent",
+         "request_body":"None",
+         "request_headers":"{'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+         "response_body":"{\"agents\": []}",
+         "response_headers":"{'status': '200', 'content-length': '14', 'content-location': 'http://23.253.76.97:8774/v2.1/cf6b1933fe5b476fbbabb876f6d1b924/os-agents', 'x-compute-request-id': 'req-e41aa9b4-41a6-4138-ae04-220b768eb644', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': 'application/json'}",
+         "service":"Nova",
+         "status_code":"200",
+         "url":"v2.1/<id>/os-agents",
+         "verb":"GET"
+},
+      {
+         "name":"AgentsAdminTestJSON:tearDown",
+         "request_body":"None",
+         "request_headers":"{'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+         "response_headers":"{'status': '404', 'content-length': '82', 'x-compute-request-id': 'req-e297aeea-91cf-4f26-b49c-8f46b1b7a926', 'vary': 'X-OpenStack-Nova-API-Version', 'connection': 'close', 'x-openstack-nova-api-version': '2.1', 'date': 'Tue, 02 Feb 2016 03:27:02 GMT', 'content-type': 'application/json; charset=UTF-8'}",
+         "service":"Nova",
+         "status_code":"404",
+         "url":"v2.1/<id>/os-agents/3",
+         "verb":"DELETE"
+}]}
\ No newline at end of file
diff --git a/tempest/tests/cmd/test_account_generator.py b/tempest/tests/cmd/test_account_generator.py
index d15cd26..7d764be 100644
--- a/tempest/tests/cmd/test_account_generator.py
+++ b/tempest/tests/cmd/test_account_generator.py
@@ -337,3 +337,24 @@
     def setUp(self):
         self.mock_domains()
         super(TestDumpAccountsV3, self).setUp()
+
+
+class TestAccountGeneratorCliCheck(base.TestCase):
+
+    def setUp(self):
+        super(TestAccountGeneratorCliCheck, self).setUp()
+        self.account_generator = account_generator.TempestAccountGenerator(
+            app=mock.Mock(), app_args=mock.Mock())
+        self.parser = self.account_generator.get_parser("generator")
+
+    def test_account_generator_zero_concurrency(self):
+        error = self.assertRaises(
+            SystemExit, lambda: self.parser.parse_args(
+                ['-r', '0', 'accounts_file.yaml']))
+        self.assertTrue(error.code != 0)
+
+    def test_account_generator_negative_concurrency(self):
+        error = self.assertRaises(
+            SystemExit, lambda: self.parser.parse_args(
+                ['-r', '-1', 'accounts_file.yaml']))
+        self.assertTrue(error.code != 0)
diff --git a/tempest/tests/cmd/test_cleanup_services.py b/tempest/tests/cmd/test_cleanup_services.py
index 7bf7315..fc44793 100644
--- a/tempest/tests/cmd/test_cleanup_services.py
+++ b/tempest/tests/cmd/test_cleanup_services.py
@@ -511,7 +511,8 @@
             },
             {
                 "id": "aa77asdf-1234",
-                "name": "saved-volume"
+                "name": "saved-volume",
+                "links": [],
             }
         ]
     }
diff --git a/tempest/tests/cmd/test_subunit_describe_calls.py b/tempest/tests/cmd/test_subunit_describe_calls.py
index cb34ba6..4fed84a 100644
--- a/tempest/tests/cmd/test_subunit_describe_calls.py
+++ b/tempest/tests/cmd/test_subunit_describe_calls.py
@@ -14,220 +14,422 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import argparse
+from io import StringIO
 import os
+import shutil
 import subprocess
+import sys
 import tempfile
+from unittest import mock
+from unittest.mock import patch
 
+
+from oslo_serialization import jsonutils as json
 from tempest.cmd import subunit_describe_calls
 from tempest.tests import base
 
 
-class TestSubunitDescribeCalls(base.TestCase):
-    def test_return_code(self):
-        subunit_file = os.path.join(
-            os.path.dirname(os.path.abspath(__file__)),
-            'sample_streams/calls.subunit')
-        p = subprocess.Popen([
-            'subunit-describe-calls', '-s', subunit_file,
-            '-o', tempfile.mkstemp()[1]], stdin=subprocess.PIPE)
-        p.communicate()
-        self.assertEqual(0, p.returncode)
+class TestArgumentParser(base.TestCase):
+    def test_init(self):
+        test_object = subunit_describe_calls.ArgumentParser()
+        self.assertEqual("subunit-describe-calls", test_object.prog)
+        self.assertEqual(subunit_describe_calls.DESCRIPTION,
+                         test_object.description)
 
-    def test_verbose(self):
-        subunit_file = os.path.join(
-            os.path.dirname(os.path.abspath(__file__)),
-            'sample_streams/calls.subunit')
-        p = subprocess.Popen([
-            'subunit-describe-calls', '-s', subunit_file,
-            '-v'], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
-        stdout = p.communicate()
-        self.assertEqual(0, p.returncode)
-        self.assertIn(b'- request headers:', stdout[0])
-        self.assertIn(b'- request body:', stdout[0])
-        self.assertIn(b'- response headers:', stdout[0])
-        self.assertIn(b'- response body:', stdout[0])
 
-    def test_return_code_no_output(self):
-        subunit_file = os.path.join(
+class TestUrlParser(base.TestCase):
+    services_custom_ports = {
+        "18776": "Block Storage",
+        "18774": "Nova",
+        "18773": "Nova-API",
+        "18386": "Sahara",
+        "35358": "Keystone",
+        "19292": "Glance",
+        "19696": "Neutron",
+        "16000": "Swift",
+        "18004": "Heat",
+        "18777": "Ceilometer",
+        "10080": "Horizon",
+        "18080": "Swift",
+        "1873": "rsync",
+        "13260": "iSCSI",
+        "13306": "MySQL",
+        "15672": "AMQP",
+        "18082": "murano"}
+
+    def setUp(self):
+        super(TestUrlParser, self).setUp()
+        self.test_object = subunit_describe_calls.UrlParser()
+
+    def test_get_service_default_ports(self):
+        base_url = "http://site.something.com:"
+        for port in self.test_object.services:
+            url = base_url + port + "/v2/action"
+            service = self.test_object.services[port]
+            self.assertEqual(service, self.test_object.get_service(url))
+
+    def test_get_service_custom_ports(self):
+        self.test_object = subunit_describe_calls.\
+            UrlParser(services=self.services_custom_ports)
+        base_url = "http://site.something.com:"
+        for port in self.services_custom_ports:
+            url = base_url + port + "/v2/action"
+            service = self.services_custom_ports[port]
+            self.assertEqual(service, self.test_object.get_service(url))
+
+    def test_get_service_port_not_found(self):
+        url = "https://site.somewhere.com:1234/v2/action"
+        self.assertEqual("Unknown", self.test_object.get_service(url))
+        self.assertEqual("Unknown", self.test_object.get_service(""))
+
+    def test_parse_details_none(self):
+        self.assertIsNone(self.test_object.parse_details(None))
+
+    def test_url_path_ports(self):
+        uuid_sample1 = "3715e0bb-b1b3-4291-aa13-2c86c3b9ec93"
+        uuid_sample2 = "2715e0bb-b1b4-4291-aa13-2c86c3b9ec88"
+
+        # test http url
+        host = "http://host.company.com"
+        url = host + ":8776/v3/" + uuid_sample1 + "/types/" + \
+            uuid_sample2 + "/extra_specs"
+        self.assertEqual("v3/<uuid>/types/<uuid>/extra_specs",
+                         self.test_object.url_path(url))
+        url = host + ":8774/v2.1/servers/" + uuid_sample1
+        self.assertEqual("v2.1/servers/<uuid>",
+                         self.test_object.url_path(url))
+        # test https url
+        host = "https://host.company.com"
+        url = host + ":8776/v3/" + uuid_sample1 + "/types/" + \
+            uuid_sample2 + "/extra_specs"
+        self.assertEqual("v3/<uuid>/types/<uuid>/extra_specs",
+                         self.test_object.url_path(url))
+        url = host + ":8774/v2.1/servers/" + uuid_sample1
+        self.assertEqual("v2.1/servers/<uuid>",
+                         self.test_object.url_path(url))
+
+    def test_url_path_no_match(self):
+        host_port = 'https://host.company.com:1234/'
+        url = 'v2/action/no/special/data'
+        self.assertEqual(url, self.test_object.url_path(host_port + url))
+        url = 'data'
+        self.assertEqual(url, self.test_object.url_path(url))
+
+
+class TestCliBase(base.TestCase):
+    """Base class for share code on all CLI sub-process testing"""
+
+    def setUp(self):
+        super(TestCliBase, self).setUp()
+        self._subunit_file = os.path.join(
             os.path.dirname(os.path.abspath(__file__)),
-            'sample_streams/calls.subunit')
+            'subunit_describe_calls_data', 'calls.subunit')
+
+    def _bytes_to_string(self, data):
+        if isinstance(data, (bytes, bytearray)):
+            data = str(data, 'utf-8')
+        return data
+
+    def _assert_cli_message(self, data):
+        data = self._bytes_to_string(data)
+        self.assertIn("Running subunit_describe_calls ...", data)
+
+    def _assert_deprecated_warning(self, stdout):
+        self.assertIn(
+            b"Use of: 'subunit-describe-calls' is deprecated, "
+            b"please use: 'tempest subunit-describe-calls'", stdout)
+
+    def _assert_expect_json(self, json_data):
+        expected_file_name = os.path.join(
+            os.path.dirname(os.path.abspath(__file__)),
+            'subunit_describe_calls_data', 'calls_subunit_expected.json')
+        with open(expected_file_name, "rb") as read_file:
+            expected_result = json.load(read_file)
+        self.assertDictEqual(expected_result, json_data)
+
+    def _assert_headers_and_bodies(self, data):
+        data = self._bytes_to_string(data)
+        self.assertIn('- request headers:', data)
+        self.assertIn('- request body:', data)
+        self.assertIn('- response headers:', data)
+        self.assertIn('- response body:', data)
+
+    def _assert_methods_details(self, data):
+        data = self._bytes_to_string(data)
+        self.assertIn('foo', data)
+        self.assertIn('- 200 POST request for Nova to v2.1/<id>/',
+                      data)
+        self.assertIn('- 200 DELETE request for Nova to v2.1/<id>/',
+                      data)
+        self.assertIn('- 200 GET request for Nova to v2.1/<id>/',
+                      data)
+        self.assertIn('- 404 DELETE request for Nova to v2.1/<id>/',
+                      data)
+
+    def _assert_mutual_exclusive_message(self, stderr):
+        self.assertIn(b"usage: subunit-describe-calls "
+                      b"[-h] [-s [<subunit file>]]", stderr)
+        self.assertIn(b"[-n <non subunit name>] [-o <output file>]",
+                      stderr)
+        self.assertIn(b"[-p <ports file>] [-v | -a]", stderr)
+        self.assertIn(
+            b"subunit-describe-calls: error: argument -v/--verbose: "
+            b"not allowed with argument -a/--all-stdout", stderr)
+
+    def _assert_no_headers_and_bodies(self, data):
+        data = self._bytes_to_string(data)
+        self.assertNotIn('- request headers:', data)
+        self.assertNotIn('- request body:', data)
+        self.assertNotIn('- response headers:', data)
+        self.assertNotIn('- response body:', data)
+
+
+class TestMainCli(TestCliBase):
+    """Test cases that use subunit_describe_calls module main interface
+
+    via subprocess calls to make sure the total user experience
+    is well defined and tested. This interface is deprecated.
+    Note: these test do not affect code coverage percentages.
+    """
+
+    def test_main_output_file(self):
+        temp_file = tempfile.mkstemp()[1]
         p = subprocess.Popen([
-            'subunit-describe-calls', '-s', subunit_file],
-            stdin=subprocess.PIPE, stdout=subprocess.PIPE)
-        stdout = p.communicate()
+            'subunit-describe-calls', '-s', self._subunit_file,
+            '-o', temp_file], stdin=subprocess.PIPE,
+            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
         self.assertEqual(0, p.returncode)
-        self.assertIn(b'foo', stdout[0])
-        self.assertIn(b'- 200 POST request for Nova to v2.1/<id>/',
-                      stdout[0])
-        self.assertIn(b'- 200 DELETE request for Nova to v2.1/<id>/',
-                      stdout[0])
-        self.assertIn(b'- 200 GET request for Nova to v2.1/<id>/',
-                      stdout[0])
-        self.assertIn(b'- 404 DELETE request for Nova to v2.1/<id>/',
-                      stdout[0])
-        self.assertNotIn(b'- request headers:', stdout[0])
-        self.assertNotIn(b'- request body:', stdout[0])
-        self.assertNotIn(b'- response headers:', stdout[0])
-        self.assertNotIn(b'- response body:', stdout[0])
+        self._assert_cli_message(stdout)
+        self._assert_deprecated_warning(stdout)
+        with open(temp_file, 'r') as file:
+            data = json.loads(file.read())
+        self._assert_expect_json(data)
+
+    def test_main_verbose(self):
+        p = subprocess.Popen([
+            'subunit-describe-calls', '-s', self._subunit_file,
+            '-v'], stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
+        self.assertEqual(0, p.returncode)
+        self._assert_cli_message(stdout)
+        self._assert_deprecated_warning(stdout)
+        self._assert_methods_details(stdout)
+        self._assert_headers_and_bodies(stdout)
+
+    def test_main_all_stdout(self):
+        p = subprocess.Popen([
+            'subunit-describe-calls', '-s', self._subunit_file,
+            '--all-stdout'], stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
+        self.assertEqual(0, p.returncode)
+        self._assert_cli_message(stdout)
+        self._assert_deprecated_warning(stdout)
+        self._assert_methods_details(stdout)
+        self._assert_headers_and_bodies(stdout)
+
+    def test_main(self):
+        p = subprocess.Popen([
+            'subunit-describe-calls', '-s', self._subunit_file],
+            stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
+        self.assertEqual(0, p.returncode)
+        self._assert_cli_message(stdout)
+        self._assert_deprecated_warning(stdout)
+        self._assert_methods_details(stdout)
+        self._assert_no_headers_and_bodies(stdout)
+
+    def test_main_verbose_and_all_stdout(self):
+        p = subprocess.Popen([
+            'subunit-describe-calls', '-s', self._subunit_file,
+            '-a', '-v'],
+            stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
+        self.assertEqual(2, p.returncode)
+        self._assert_cli_message(stdout)
+        self._assert_deprecated_warning(stdout)
+        self._assert_mutual_exclusive_message(stderr)
+
+
+class TestCli(TestCliBase):
+    """Test cases that use tempest subunit_describe_calls cliff interface
+
+    via subprocess calls to make sure the total user experience
+    is well defined and tested.
+    Note: these test do not affect code coverage percentages.
+    """
+
+    def _assert_cliff_verbose(self, stdout):
+        self.assertIn(b'tempest initialize_app', stdout)
+        self.assertIn(b'prepare_to_run_command TempestSubunitDescribeCalls',
+                      stdout)
+        self.assertIn(b'tempest clean_up TempestSubunitDescribeCalls',
+                      stdout)
+
+    def test_run_all_stdout(self):
+        p = subprocess.Popen(['tempest', 'subunit-describe-calls',
+                              '-s', self._subunit_file, '-a'],
+                             stdin=subprocess.PIPE,
+                             stdout=subprocess.PIPE,
+                             stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
+        self.assertEqual(0, p.returncode)
+        self._assert_cli_message(stdout)
+        self._assert_methods_details(stdout)
+        self._assert_headers_and_bodies(stdout)
+
+    def test_run_verbose(self):
+        p = subprocess.Popen(['tempest', 'subunit-describe-calls',
+                              '-s', self._subunit_file, '-v'],
+                             stdin=subprocess.PIPE,
+                             stdout=subprocess.PIPE,
+                             stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
+        self.assertEqual(0, p.returncode)
+        self._assert_cli_message(stdout)
+        self._assert_methods_details(stdout)
+        self._assert_no_headers_and_bodies(stdout)
+        self._assert_cliff_verbose(stderr)
+
+    def test_run_min(self):
+        p = subprocess.Popen(['tempest', 'subunit-describe-calls',
+                              '-s', self._subunit_file],
+                             stdin=subprocess.PIPE,
+                             stdout=subprocess.PIPE,
+                             stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
+        self.assertEqual(0, p.returncode)
+        self._assert_cli_message(stdout)
+        self._assert_methods_details(stdout)
+        self._assert_no_headers_and_bodies(stdout)
+
+    def test_run_verbose_all_stdout(self):
+        """Test Cliff -v argument
+
+        Since Cliff framework has a argument at the
+        abstract command level the -v or --verbose for
+        this command is not processed as a boolean.
+        So the use of verbose only exists for the
+        deprecated main CLI interface.  When the
+        main is deleted this test would not be needed.
+        """
+        p = subprocess.Popen(['tempest', 'subunit-describe-calls',
+                              '-s', self._subunit_file, '-a', '-v'],
+                             stdin=subprocess.PIPE,
+                             stdout=subprocess.PIPE,
+                             stderr=subprocess.PIPE)
+        stdout, stderr = p.communicate()
+        self.assertEqual(0, p.returncode)
+        self._assert_cli_message(stdout)
+        self._assert_cliff_verbose(stderr)
+        self._assert_methods_details(stdout)
+
+
+class TestSubunitDescribeCalls(TestCliBase):
+    """Test cases use the subunit_describe_calls module interface
+
+    and effect code coverage reporting
+    """
+
+    def setUp(self):
+        super(TestSubunitDescribeCalls, self).setUp()
+        self.test_object = subunit_describe_calls.TempestSubunitDescribeCalls(
+            app=mock.Mock(),
+            app_args=mock.Mock(spec=argparse.Namespace))
 
     def test_parse(self):
-        subunit_file = os.path.join(
-            os.path.dirname(os.path.abspath(__file__)),
-            'sample_streams/calls.subunit')
-        parser = subunit_describe_calls.parse(
-            open(subunit_file), "pythonlogging", None)
-        expected_result = {
-            'bar': [{
-                'name': 'AgentsAdminTestJSON:setUp',
-                'request_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
-                '"hypervisor": "common", "md5hash": '
-                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
-                '"architecture": "tempest-x86_64-424013832", "os": "linux"}}',
-                'request_headers': "{'Content-Type': 'application/json', "
-                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
-                'response_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
-                '"hypervisor": "common", "md5hash": '
-                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
-                '"architecture": "tempest-x86_64-424013832", "os": "linux", '
-                '"agent_id": 1}}',
-                'response_headers': "{'status': '200', 'content-length': "
-                "'203', 'x-compute-request-id': "
-                "'req-25ddaae2-0ef1-40d1-8228-59bd64a7e75b', 'vary': "
-                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
-                "'x-openstack-nova-api-version': '2.1', 'date': "
-                "'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': "
-                "'application/json'}",
-                'service': 'Nova',
-                'status_code': '200',
-                'url': 'v2.1/<id>/os-agents',
-                'verb': 'POST'}, {
-                'name': 'AgentsAdminTestJSON:test_create_agent',
-                'request_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
-                '"hypervisor": "kvm", "md5hash": '
-                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
-                '"architecture": "tempest-x86-252246646", "os": "win"}}',
-                'request_headers': "{'Content-Type': 'application/json', "
-                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
-                'response_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
-                '"hypervisor": "kvm", "md5hash": '
-                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
-                '"architecture": "tempest-x86-252246646", "os": "win", '
-                '"agent_id": 2}}',
-                'response_headers': "{'status': '200', 'content-length': "
-                "'195', 'x-compute-request-id': "
-                "'req-b4136f06-c015-4e7e-995f-c43831e3ecce', 'vary': "
-                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
-                "'x-openstack-nova-api-version': '2.1', 'date': "
-                "'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': "
-                "'application/json'}",
-                'service': 'Nova',
-                'status_code': '200',
-                'url': 'v2.1/<id>/os-agents',
-                'verb': 'POST'}, {
-                'name': 'AgentsAdminTestJSON:tearDown',
-                'request_body': 'None',
-                'request_headers': "{'Content-Type': 'application/json', "
-                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
-                'response_body': '',
-                'response_headers': "{'status': '200', 'content-length': "
-                "'0', 'x-compute-request-id': "
-                "'req-ee905fd6-a5b5-4da4-8c37-5363cb25bd9d', 'vary': "
-                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
-                "'x-openstack-nova-api-version': '2.1', 'date': "
-                "'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': "
-                "'application/json'}",
-                'service': 'Nova',
-                'status_code': '200',
-                'url': 'v2.1/<id>/os-agents/1',
-                'verb': 'DELETE'}, {
-                'name': 'AgentsAdminTestJSON:_run_cleanups',
-                'request_body': 'None',
-                'request_headers': "{'Content-Type': 'application/json', "
-                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
-                'response_headers': "{'status': '200', 'content-length': "
-                "'0', 'x-compute-request-id': "
-                "'req-e912cac0-63e0-4679-a68a-b6d18ddca074', 'vary': "
-                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
-                "'x-openstack-nova-api-version': '2.1', 'date': "
-                "'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': "
-                "'application/json'}",
-                'service': 'Nova',
-                'status_code': '200',
-                'url': 'v2.1/<id>/os-agents/2',
-                'verb': 'DELETE'}],
-            'foo': [{
-                'name': 'AgentsAdminTestJSON:setUp',
-                'request_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
-                '"hypervisor": "common", "md5hash": '
-                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
-                '"architecture": "tempest-x86_64-948635295", "os": "linux"}}',
-                'request_headers': "{'Content-Type': 'application/json', "
-                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
-                'response_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
-                '"hypervisor": "common", "md5hash": '
-                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
-                '"architecture": "tempest-x86_64-948635295", "os": "linux", '
-                '"agent_id": 3}}',
-                'response_headers': "{'status': '200', 'content-length': "
-                "'203', 'x-compute-request-id': "
-                "'req-ccd2116d-04b1-4ffe-ae32-fb623f68bf1c', 'vary': "
-                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
-                "'x-openstack-nova-api-version': '2.1', 'date': "
-                "'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': "
-                "'application/json'}",
-                'service': 'Nova',
-                'status_code': '200',
-                'url': 'v2.1/<id>/os-agents',
-                'verb': 'POST'}, {
-                'name': 'AgentsAdminTestJSON:test_delete_agent',
-                'request_body': 'None',
-                'request_headers': "{'Content-Type': 'application/json', "
-                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
-                'response_body': '',
-                'response_headers': "{'status': '200', 'content-length': "
-                "'0', 'x-compute-request-id': "
-                "'req-6e7fa28f-ae61-4388-9a78-947c58bc0588', 'vary': "
-                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
-                "'x-openstack-nova-api-version': '2.1', 'date': "
-                "'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': "
-                "'application/json'}",
-                'service': 'Nova',
-                'status_code': '200',
-                'url': 'v2.1/<id>/os-agents/3',
-                'verb': 'DELETE'}, {
-                'name': 'AgentsAdminTestJSON:test_delete_agent',
-                'request_body': 'None',
-                'request_headers': "{'Content-Type': 'application/json', "
-                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
-                'response_body': '{"agents": []}',
-                'response_headers': "{'status': '200', 'content-length': "
-                "'14', 'content-location': "
-                "'http://23.253.76.97:8774/v2.1/"
-                "cf6b1933fe5b476fbbabb876f6d1b924/os-agents', "
-                "'x-compute-request-id': "
-                "'req-e41aa9b4-41a6-4138-ae04-220b768eb644', 'vary': "
-                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
-                "'x-openstack-nova-api-version': '2.1', 'date': "
-                "'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': "
-                "'application/json'}",
-                'service': 'Nova',
-                'status_code': '200',
-                'url': 'v2.1/<id>/os-agents',
-                'verb': 'GET'}, {
-                'name': 'AgentsAdminTestJSON:tearDown',
-                'request_body': 'None',
-                'request_headers': "{'Content-Type': 'application/json', "
-                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
-                'response_headers': "{'status': '404', 'content-length': "
-                "'82', 'x-compute-request-id': "
-                "'req-e297aeea-91cf-4f26-b49c-8f46b1b7a926', 'vary': "
-                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
-                "'x-openstack-nova-api-version': '2.1', 'date': "
-                "'Tue, 02 Feb 2016 03:27:02 GMT', 'content-type': "
-                "'application/json; charset=UTF-8'}",
-                'service': 'Nova',
-                'status_code': '404',
-                'url': 'v2.1/<id>/os-agents/3',
-                'verb': 'DELETE'}]}
+        with open(self._subunit_file, 'r') as read_file:
+            parser = subunit_describe_calls.parse(
+                read_file, "pythonlogging", None)
+        self._assert_expect_json(parser.test_logs)
 
-        self.assertEqual(expected_result, parser.test_logs)
+    def test_get_description(self):
+        self.assertEqual(subunit_describe_calls.DESCRIPTION,
+                         self.test_object.get_description())
+
+    def test_get_parser_default_min(self):
+        parser = self.test_object.get_parser('NAME')
+        parsed_args = parser.parse_args([])
+        self.assertIsNone(parsed_args.output_file)
+        self.assertIsNone(parsed_args.ports)
+        self.assertFalse(parsed_args.all_stdout)
+        self.assertEqual(parsed_args.subunit, sys.stdin)
+
+    def test_get_parser_default_max(self):
+        temp_dir = tempfile.mkdtemp(prefix="parser")
+        self.addCleanup(shutil.rmtree, temp_dir, ignore_errors=True)
+        outfile_name = os.path.join(temp_dir, 'output.json')
+        open(outfile_name, 'a').close()
+        portfile_name = os.path.join(temp_dir, 'ports.json')
+        open(portfile_name, 'a').close()
+
+        parser = self.test_object.get_parser('NAME')
+        parsed_args = parser.parse_args(["-a", "-o " + outfile_name,
+                                         "-p " + portfile_name])
+
+        self.assertIsNotNone(parsed_args.output_file)
+        self.assertIsNotNone(parsed_args.ports)
+        self.assertTrue(parsed_args.all_stdout)
+        self.assertEqual(parsed_args.subunit, sys.stdin)
+
+    def test_take_action_min(self):
+        parser = self.test_object.get_parser('NAME')
+        parsed_args = parser.parse_args(["-s" + self._subunit_file],)
+        with patch('sys.stdout', new=StringIO()) as mock_stdout:
+            self.test_object.take_action(parsed_args)
+
+        stdout_data = mock_stdout.getvalue()
+        self._assert_methods_details(stdout_data)
+        self._assert_no_headers_and_bodies(stdout_data)
+
+    def test_take_action_all_stdout(self):
+        parser = self.test_object.get_parser('NAME')
+        parsed_args = parser.parse_args(["-as" + self._subunit_file],)
+        with patch('sys.stdout', new=StringIO()) as mock_stdout:
+            self.test_object.take_action(parsed_args)
+
+        stdout_data = mock_stdout.getvalue()
+        self._assert_methods_details(stdout_data)
+        self._assert_headers_and_bodies(stdout_data)
+
+    def test_take_action_outfile_files(self):
+        temp_file = tempfile.mkstemp()[1]
+        parser = self.test_object.get_parser('NAME')
+        parsed_args = parser.parse_args(
+            ["-as" + self._subunit_file, '-o', temp_file], )
+        with patch('sys.stdout', new=StringIO()) as mock_stdout:
+            self.test_object.take_action(parsed_args)
+        stdout_data = mock_stdout.getvalue()
+        self._assert_cli_message(stdout_data)
+        with open(temp_file, 'r') as file:
+            data = json.loads(file.read())
+        self._assert_expect_json(data)
+
+    def test_take_action_no_items(self):
+        temp_file = tempfile.mkstemp()[1]
+        parser = self.test_object.get_parser('NAME')
+        parsed_args = parser.parse_args(
+            ["-as" + temp_file], )
+        with patch('sys.stdout', new=StringIO()) as mock_stdout:
+            self.test_object.take_action(parsed_args)
+        stdout_data = mock_stdout.getvalue()
+        self._assert_cli_message(stdout_data)
+
+    def test_take_action_exception(self):
+        parser = self.test_object.get_parser('NAME')
+        parsed_args = parser.parse_args(["-s" + self._subunit_file],)
+        with patch('sys.stderr', new=StringIO()) as mock_stderr:
+            with patch('tempest.cmd.subunit_describe_calls.entry_point') \
+                    as mock_method:
+                mock_method.side_effect = OSError()
+                self.assertRaises(OSError, self.test_object.take_action,
+                                  parsed_args)
+                stderr_data = mock_stderr.getvalue()
+
+        self.assertIn("Traceback (most recent call last):", stderr_data)
+        self.assertIn("entry_point(parsed_args)", stderr_data)
diff --git a/tempest/tests/cmd/test_tempest_init.py b/tempest/tests/cmd/test_tempest_init.py
index 9042b12..fce0882 100644
--- a/tempest/tests/cmd/test_tempest_init.py
+++ b/tempest/tests/cmd/test_tempest_init.py
@@ -40,7 +40,7 @@
 
     def test_generate_sample_config(self):
         local_dir = self.useFixture(fixtures.TempDir())
-        etc_dir_path = os.path.join(local_dir.path, 'etc/')
+        etc_dir_path = os.path.join(local_dir.path, 'etc')
         os.mkdir(etc_dir_path)
         init_cmd = init.TempestInit(None, None)
         local_sample_conf_file = os.path.join(etc_dir_path,
@@ -56,7 +56,7 @@
 
     def test_update_local_conf(self):
         local_dir = self.useFixture(fixtures.TempDir())
-        etc_dir_path = os.path.join(local_dir.path, 'etc/')
+        etc_dir_path = os.path.join(local_dir.path, 'etc')
         os.mkdir(etc_dir_path)
         lock_dir = os.path.join(local_dir.path, 'tempest_lock')
         config_path = os.path.join(etc_dir_path, 'tempest.conf')
diff --git a/tempest/tests/cmd/test_verify_tempest_config.py b/tempest/tests/cmd/test_verify_tempest_config.py
index dad31b4..277e049 100644
--- a/tempest/tests/cmd/test_verify_tempest_config.py
+++ b/tempest/tests/cmd/test_verify_tempest_config.py
@@ -579,7 +579,7 @@
                           os, 'fakeservice')
 
     def test_get_config_file(self):
-        conf_dir = os.path.join(os.getcwd(), 'etc/')
+        conf_dir = os.path.join(os.getcwd(), 'etc')
         conf_file = "tempest.conf.sample"
         local_sample_conf_file = os.path.join(conf_dir, conf_file)
 
@@ -629,3 +629,23 @@
     def test_contains_version_negative_data(self):
         self.assertFalse(
             verify_tempest_config.contains_version('v5.', ['v1.0', 'v2.0']))
+
+    def test_check_service_availability(self):
+        class FakeAuthProvider:
+            def get_auth(self):
+                return ('token',
+                        {'serviceCatalog': [{'type': 'compute'},
+                                            {'type': 'image'},
+                                            {'type': 'volumev3'},
+                                            {'type': 'network'},
+                                            {'type': 'object-store'}]})
+
+        class Fake_os:
+            auth_provider = FakeAuthProvider()
+            auth_version = 'v2'
+        verify_tempest_config.CONF._config = fake_config.FakePrivate()
+        services = verify_tempest_config.check_service_availability(
+            Fake_os(), True)
+        self.assertEqual(
+            sorted(['nova', 'glance', 'neutron', 'swift', 'cinder']),
+            sorted(services))
diff --git a/tempest/tests/cmd/test_workspace.py b/tempest/tests/cmd/test_workspace.py
index 7a6b576..eae6202 100644
--- a/tempest/tests/cmd/test_workspace.py
+++ b/tempest/tests/cmd/test_workspace.py
@@ -16,12 +16,12 @@
 import shutil
 import subprocess
 import tempfile
-
-from mock import patch
+from unittest.mock import patch
 try:
     from StringIO import StringIO
 except ImportError:
     from io import StringIO
+
 from tempest.cmd import workspace
 from tempest.lib.common.utils import data_utils
 from tempest.tests import base
diff --git a/tempest/tests/common/test_waiters.py b/tempest/tests/common/test_waiters.py
index 5f8b990..73924bd 100755
--- a/tempest/tests/common/test_waiters.py
+++ b/tempest/tests/common/test_waiters.py
@@ -234,6 +234,29 @@
                                     mock.call(volume_id)])
         mock_sleep.assert_called_once_with(1)
 
+    def test_wait_for_volume_attachment_create(self):
+        vol_detached = {'volume': {'attachments': []}}
+        vol_attached = {'volume': {'attachments': [
+                       {'id': uuids.volume_id,
+                        'attachment_id': uuids.attachment_id,
+                        'server_id': uuids.server_id,
+                        'volume_id': uuids.volume_id}]}}
+        show_volume = mock.MagicMock(side_effect=[
+            vol_detached, vol_detached, vol_attached])
+        client = mock.Mock(spec=volumes_client.VolumesClient,
+                           build_interval=1,
+                           build_timeout=5,
+                           show_volume=show_volume)
+        self.patch('time.time')
+        self.patch('time.sleep')
+        att = waiters.wait_for_volume_attachment_create(
+            client, uuids.volume_id, uuids.server_id)
+        assert att == vol_attached['volume']['attachments'][0]
+        # Assert that show volume is called until the attachment is removed.
+        show_volume.assert_has_calls([mock.call(uuids.volume_id),
+                                      mock.call(uuids.volume_id),
+                                      mock.call(uuids.volume_id)])
+
     def test_wait_for_volume_attachment(self):
         vol_detached = {'volume': {'attachments': []}}
         vol_attached = {'volume': {'attachments': [
@@ -249,9 +272,9 @@
         waiters.wait_for_volume_attachment_remove(client, uuids.volume_id,
                                                   uuids.attachment_id)
         # Assert that show volume is called until the attachment is removed.
-        show_volume.assert_has_calls = [mock.call(uuids.volume_id),
-                                        mock.call(uuids.volume_id),
-                                        mock.call(uuids.volume_id)]
+        show_volume.assert_has_calls([mock.call(uuids.volume_id),
+                                      mock.call(uuids.volume_id),
+                                      mock.call(uuids.volume_id)])
 
     def test_wait_for_volume_attachment_timeout(self):
         show_volume = mock.MagicMock(return_value={
diff --git a/tempest/tests/lib/cmd/__init__.py b/tempest/tests/lib/cmd/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/tests/lib/cmd/__init__.py
diff --git a/tempest/tests/lib/cmd/test_check_uuid.py b/tempest/tests/lib/cmd/test_check_uuid.py
new file mode 100644
index 0000000..28ebca1
--- /dev/null
+++ b/tempest/tests/lib/cmd/test_check_uuid.py
@@ -0,0 +1,181 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import importlib
+import os
+import sys
+import tempfile
+from unittest import mock
+
+import fixtures
+
+from tempest.lib.cmd import check_uuid
+from tempest.tests import base
+
+
+class TestCLInterface(base.TestCase):
+    CODE = "import unittest\n" \
+           "class TestClass(unittest.TestCase):\n" \
+           "    def test_tests(self):\n" \
+           "        pass"
+
+    def create_tests_file(self, directory):
+        with open(directory + "/__init__.py", "w"):
+            pass
+
+        tests_file = directory + "/tests.py"
+        with open(tests_file, "w") as fake_file:
+            fake_file.write(TestCLInterface.CODE)
+
+        return tests_file
+
+    def test_fix_argument_no(self):
+        temp_dir = self.useFixture(fixtures.TempDir(rootdir="."))
+        tests_file = self.create_tests_file(temp_dir.path)
+
+        sys.argv = [sys.argv[0]] + ["--package",
+                                    os.path.relpath(temp_dir.path)]
+
+        self.assertRaises(SystemExit, check_uuid.run)
+        with open(tests_file, "r") as f:
+            self.assertTrue(TestCLInterface.CODE == f.read())
+
+    def test_fix_argument_yes(self):
+        temp_dir = self.useFixture(fixtures.TempDir(rootdir="."))
+        tests_file = self.create_tests_file(temp_dir.path)
+
+        sys.argv = [sys.argv[0]] + ["--fix", "--package",
+                                    os.path.relpath(temp_dir.path)]
+
+        check_uuid.run()
+        with open(tests_file, "r") as f:
+            self.assertTrue(TestCLInterface.CODE != f.read())
+
+
+class TestSourcePatcher(base.TestCase):
+    def test_add_patch(self):
+        patcher = check_uuid.SourcePatcher()
+        fake_file = tempfile.NamedTemporaryFile("w+t", delete=False)
+        file_contents = 'first_line\nsecond_line'
+        fake_file.write(file_contents)
+        fake_file.close()
+        patcher.add_patch(fake_file.name, 'patch', 2)
+
+        source_file = patcher.source_files[fake_file.name]
+        self.assertEqual(1, len(patcher.patches))
+        (patch_id, patch), = patcher.patches.items()
+        self.assertEqual(patcher._quote('patch\n'), patch)
+        self.assertEqual('first_line\n{%s:s}second_line' % patch_id,
+                         patcher._unquote(source_file))
+
+    def test_apply_patches(self):
+        fake_file = tempfile.NamedTemporaryFile("w+t")
+        patcher = check_uuid.SourcePatcher()
+        patcher.patches = {'fake-uuid': patcher._quote('patch\n')}
+        patcher.source_files = {
+            fake_file.name: patcher._quote('first_line\n') +
+            '{fake-uuid:s}second_line'}
+        with mock.patch('sys.stdout'):
+            patcher.apply_patches()
+
+        lines = fake_file.read().split('\n')
+        fake_file.close()
+        self.assertEqual(['first_line', 'patch', 'second_line'], lines)
+        self.assertFalse(patcher.patches)
+        self.assertFalse(patcher.source_files)
+
+
+class TestTestChecker(base.TestCase):
+    def _test_add_uuid_to_test(self, source_file):
+        class Fake_test_node():
+            lineno = 1
+            col_offset = 4
+        patcher = check_uuid.SourcePatcher()
+        checker = check_uuid.TestChecker(importlib.import_module('tempest'))
+        fake_file = tempfile.NamedTemporaryFile("w+t", delete=False)
+        fake_file.write(source_file)
+        fake_file.close()
+        checker._add_uuid_to_test(patcher, Fake_test_node(), fake_file.name)
+
+        self.assertEqual(1, len(patcher.patches))
+        self.assertEqual(1, len(patcher.source_files))
+        (patch_id, patch), = patcher.patches.items()
+        changed_source_file, = patcher.source_files.values()
+        self.assertEqual('{%s:s}%s' % (patch_id, patcher._quote(source_file)),
+                         changed_source_file)
+        expected_patch_start = patcher._quote(
+            '    ' + check_uuid.DECORATOR_TEMPLATE.split('(')[0])
+        self.assertTrue(patch.startswith(expected_patch_start))
+
+    def test_add_uuid_to_test_def(self):
+        source_file = ("    def test_test():\n"
+                       "        pass")
+        self._test_add_uuid_to_test(source_file)
+
+    def test_add_uuid_to_test_decorator(self):
+        source_file = ("    @decorators.idempotent_id\n"
+                       "    def test_test():\n"
+                       "        pass")
+        self._test_add_uuid_to_test(source_file)
+
+    def test_add_import_for_test_uuid_no_tempest(self):
+        patcher = check_uuid.SourcePatcher()
+        checker = check_uuid.TestChecker(importlib.import_module('tempest'))
+        fake_file = tempfile.NamedTemporaryFile("w+t")
+
+        class Fake_src_parsed():
+            body = ['test_node']
+        checker._import_name = mock.Mock(return_value='fake_module')
+
+        checker._add_import_for_test_uuid(patcher, Fake_src_parsed(),
+                                          fake_file.name)
+        (patch_id, patch), = patcher.patches.items()
+        self.assertEqual(patcher._quote('\n' + check_uuid.IMPORT_LINE + '\n'),
+                         patch)
+        self.assertEqual('{%s:s}' % patch_id,
+                         patcher.source_files[fake_file.name])
+
+    def test_add_import_for_test_uuid_tempest(self):
+        patcher = check_uuid.SourcePatcher()
+        checker = check_uuid.TestChecker(importlib.import_module('tempest'))
+        fake_file = tempfile.NamedTemporaryFile("w+t", delete=False)
+        test1 = ("    def test_test():\n"
+                 "        pass\n")
+        test2 = ("    def test_another_test():\n"
+                 "        pass\n")
+        source_code = test1 + test2
+        fake_file.write(source_code)
+        fake_file.close()
+
+        def fake_import_name(node):
+            return node.name
+        checker._import_name = fake_import_name
+
+        class Fake_node():
+            def __init__(self, lineno, col_offset, name):
+                self.lineno = lineno
+                self.col_offset = col_offset
+                self.name = name
+
+        class Fake_src_parsed():
+            body = [Fake_node(1, 4, 'tempest.a_fake_module'),
+                    Fake_node(3, 4, 'another_fake_module')]
+
+        checker._add_import_for_test_uuid(patcher, Fake_src_parsed(),
+                                          fake_file.name)
+        (patch_id, patch), = patcher.patches.items()
+        self.assertEqual(patcher._quote(check_uuid.IMPORT_LINE + '\n'),
+                         patch)
+        expected_source = patcher._quote(test1) + '{' + patch_id + ':s}' +\
+            patcher._quote(test2)
+        self.assertEqual(expected_source,
+                         patcher.source_files[fake_file.name])
diff --git a/tempest/tests/lib/services/network/test_quotas_client.py b/tempest/tests/lib/services/network/test_quotas_client.py
index aa6c1a1..7dce4e1 100644
--- a/tempest/tests/lib/services/network/test_quotas_client.py
+++ b/tempest/tests/lib/services/network/test_quotas_client.py
@@ -52,7 +52,7 @@
         }
     }
 
-    FAKE_QUOTA_TENANT_ID = "bab7d5c60cd041a0a36f7c4b6e1dd978"
+    FAKE_QUOTA_PROJECT_ID = "bab7d5c60cd041a0a36f7c4b6e1dd978"
 
     FAKE_QUOTA_DETAILS = {
         "quota": {
@@ -115,7 +115,7 @@
             self.FAKE_PROJECT_QUOTAS,
             bytes_body,
             200,
-            tenant_id=self.FAKE_QUOTA_TENANT_ID)
+            project_id=self.FAKE_QUOTA_PROJECT_ID)
 
     def _test_show_default_quotas(self, bytes_body=False):
         self.check_service_client_function(
@@ -124,7 +124,7 @@
             self.FAKE_PROJECT_QUOTAS,
             bytes_body,
             200,
-            tenant_id=self.FAKE_QUOTA_TENANT_ID)
+            project_id=self.FAKE_QUOTA_PROJECT_ID)
 
     def _test_update_quotas(self, bytes_body=False):
         self.check_service_client_function(
@@ -133,7 +133,7 @@
             self.FAKE_PROJECT_QUOTAS,
             bytes_body,
             200,
-            tenant_id=self.FAKE_QUOTA_TENANT_ID)
+            project_id=self.FAKE_QUOTA_PROJECT_ID)
 
     def _test_show_quota_details(self, bytes_body=False):
         self.check_service_client_function(
@@ -142,7 +142,7 @@
             self.FAKE_QUOTA_DETAILS,
             bytes_body,
             200,
-            tenant_id=self.FAKE_QUOTA_TENANT_ID)
+            project_id=self.FAKE_QUOTA_PROJECT_ID)
 
     def test_reset_quotas(self):
         self.check_service_client_function(
@@ -150,7 +150,7 @@
             "tempest.lib.common.rest_client.RestClient.delete",
             {},
             status=204,
-            tenant_id=self.FAKE_QUOTA_TENANT_ID)
+            project_id=self.FAKE_QUOTA_PROJECT_ID)
 
     def test_list_quotas_with_str_body(self):
         self._test_list_quotas()
diff --git a/tempest/tests/lib/services/volume/v3/test_backups_client.py b/tempest/tests/lib/services/volume/v3/test_backups_client.py
index 97e1132..ca7918a 100644
--- a/tempest/tests/lib/services/volume/v3/test_backups_client.py
+++ b/tempest/tests/lib/services/volume/v3/test_backups_client.py
@@ -45,6 +45,8 @@
                 "availability_zone": "az1",
                 "container": "volumebackups",
                 "created_at": "2013-04-02T10:35:27.000000",
+                "updated_at": "2013-04-02T10:39:27.000000",
+                "data_timestamp": "2013-04-02T10:35:27.000000",
                 "description": None,
                 "fail_reason": None,
                 "id": "2ef47aee-8844-490c-804d-2a8efe561c65",
@@ -64,7 +66,6 @@
                 "user_id": "515ba0dd59f84f25a6a084a45d8d93b2",
                 "size": 1,
                 "status": "available",
-                "updated_at": "2013-04-02T10:35:27.000000",
                 "volume_id": "e5185058-943a-4cb4-96d9-72c184c337d6",
                 "is_incremental": True,
                 "has_dependent_backups": False
diff --git a/tempest/tests/lib/services/volume/v3/test_volume_manage_client.py b/tempest/tests/lib/services/volume/v3/test_volume_manage_client.py
index d4313a2..3d47caf 100644
--- a/tempest/tests/lib/services/volume/v3/test_volume_manage_client.py
+++ b/tempest/tests/lib/services/volume/v3/test_volume_manage_client.py
@@ -54,7 +54,6 @@
                 }
             ],
             "availability_zone": "nova",
-            "os-vol-host-attr:host": "controller1@rbd#rbd",
             "encrypted": False,
             "updated_at": None,
             "replication_status": None,
@@ -62,15 +61,12 @@
             "id": "c07cd4a4-b52b-4511-a176-fbaa2011a227",
             "size": 0,
             "user_id": "142d8663efce464c89811c63e45bd82e",
-            "os-vol-tenant-attr:tenant_id": "f21a9c86d7114bf99c711f4874d80474",
-            "os-vol-mig-status-attr:migstat": None,
             "metadata": {},
             "status": "creating",
             "description": "volume-manage-description",
             "multiattach": False,
             "source_volid": None,
             "consistencygroup_id": None,
-            "os-vol-mig-status-attr:name_id": None,
             "name": "volume-managed",
             "bootable": "false",
             "created_at": "2017-07-11T09:14:01.000000",
diff --git a/tempest/tests/lib/services/volume/v3/test_volumes_client.py b/tempest/tests/lib/services/volume/v3/test_volumes_client.py
index 56c1a35..6bd75d9 100644
--- a/tempest/tests/lib/services/volume/v3/test_volumes_client.py
+++ b/tempest/tests/lib/services/volume/v3/test_volumes_client.py
@@ -26,10 +26,6 @@
         "volume-summary": {
             "total_size": 4,
             "total_count": 4,
-            "metadata": {
-                "key1": ["value1", "value2"],
-                "key2": ["value2"]
-            }
         }
     }
 
diff --git a/tools/generate-tempest-plugins-list.py b/tools/generate-tempest-plugins-list.py
index 5ffef3e..618c388 100644
--- a/tools/generate-tempest-plugins-list.py
+++ b/tools/generate-tempest-plugins-list.py
@@ -41,7 +41,7 @@
     'x/intel-nfv-ci-tests',  # https://review.opendev.org/#/c/634640/
     'openstack/networking-generic-switch',
     # https://review.opendev.org/#/c/634846/
-    'openstack/networking-l2gw-tempest-plugin',
+    'x/networking-l2gw-tempest-plugin',
     # https://review.opendev.org/#/c/635093/
     'openstack/networking-midonet',  # https://review.opendev.org/#/c/635096/
     'x/networking-plumgrid',  # https://review.opendev.org/#/c/635096/
@@ -52,6 +52,8 @@
     'x/tap-as-a-service',  # To avoid sanity-job failure
     'x/valet',  # https://review.opendev.org/#/c/638339/
     'x/kingbird',  # https://bugs.launchpad.net/kingbird/+bug/1869722
+    # vmware-nsx is blacklisted since https://review.opendev.org/#/c/736952
+    'x/vmware-nsx-tempest-plugin',
 ]
 
 url = 'https://review.opendev.org/projects/'
diff --git a/tools/tempest-plugin-sanity.sh b/tools/tempest-plugin-sanity.sh
index 2ff4aea..c983da9 100644
--- a/tools/tempest-plugin-sanity.sh
+++ b/tools/tempest-plugin-sanity.sh
@@ -66,7 +66,7 @@
 # function to create virtualenv to perform sanity operation
 function prepare_workspace {
     SANITY_DIR=$(pwd)
-    virtualenv -p python3 --clear "$SANITY_DIR"/.venv
+    python3 -m venv "$SANITY_DIR"/.venv
     export TVENV="$SANITY_DIR/tools/with_venv.sh"
     cd "$SANITY_DIR"
 
diff --git a/tox.ini b/tox.ini
index 0477d6f..031a400 100644
--- a/tox.ini
+++ b/tox.ini
@@ -282,15 +282,31 @@
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
 commands =
+  sphinx-apidoc -f -o doc/source/tests/compute tempest/api/compute
+  sphinx-apidoc -f -o doc/source/tests/identity tempest/api/identity
+  sphinx-apidoc -f -o doc/source/tests/image tempest/api/image
+  sphinx-apidoc -f -o doc/source/tests/network tempest/api/network
+  sphinx-apidoc -f -o doc/source/tests/object_storage tempest/api/object_storage
+  sphinx-apidoc -f -o doc/source/tests/scenario tempest/scenario
+  sphinx-apidoc -f -o doc/source/tests/volume tempest/api/volume
   rm -rf doc/build
   sphinx-build -W -b html doc/source doc/build/html
-whitelist_externals = rm
+whitelist_externals =
+    rm
 
 [testenv:pdf-docs]
 deps = {[testenv:docs]deps}
 whitelist_externals =
+   rm
    make
 commands =
+   sphinx-apidoc -f -o doc/source/tests/compute tempest/api/compute
+   sphinx-apidoc -f -o doc/source/tests/identity tempest/api/identity
+   sphinx-apidoc -f -o doc/source/tests/image tempest/api/image
+   sphinx-apidoc -f -o doc/source/tests/network tempest/api/network
+   sphinx-apidoc -f -o doc/source/tests/object_storage tempest/api/object_storage
+   sphinx-apidoc -f -o doc/source/tests/scenario tempest/scenario
+   sphinx-apidoc -f -o doc/source/tests/volume tempest/api/volume
    sphinx-build -W -b latex doc/source doc/build/pdf
    make -C doc/build/pdf