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_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_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_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_volumes_actions.py b/tempest/api/volume/test_volumes_actions.py
index e42ea40..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
@@ -96,6 +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
@@ -118,6 +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
@@ -131,6 +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_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()