diff --git a/releasenotes/notes/12.2.0-clients_module-16f3025f515bf9ec.yaml b/releasenotes/notes/12.2.0-clients_module-16f3025f515bf9ec.yaml
index 53741da..484d543 100644
--- a/releasenotes/notes/12.2.0-clients_module-16f3025f515bf9ec.yaml
+++ b/releasenotes/notes/12.2.0-clients_module-16f3025f515bf9ec.yaml
@@ -8,7 +8,7 @@
     access service clients defined in Tempest as well as service clients
     defined in all loaded plugins.
     The new ServiceClients class only exposes for now the service clients
-    which are in tempest.lib, i.e. compute, network and image. The remaing
+    which are in tempest.lib, i.e. compute, network and image. The remaining
     service clients (identity, volume and object-storage) will be added in
     future updates.
 deprecations:
diff --git a/requirements.txt b/requirements.txt
index 07dd1c1..ea73180 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-pbr>=1.6 # Apache-2.0
+pbr>=1.8 # Apache-2.0
 cliff>=2.2.0 # Apache-2.0
 jsonschema!=2.5.0,<3.0.0,>=2.0.0 # MIT
 testtools>=1.4.0 # MIT
diff --git a/tempest/api/compute/admin/test_agents.py b/tempest/api/compute/admin/test_agents.py
index 61359f1..40cb523 100644
--- a/tempest/api/compute/admin/test_agents.py
+++ b/tempest/api/compute/admin/test_agents.py
@@ -90,7 +90,8 @@
         body = self.client.create_agent(**self.params_agent)['agent']
         self.addCleanup(self.client.delete_agent, body['agent_id'])
         agents = self.client.list_agents()['agents']
-        self.assertTrue(len(agents) > 0, 'Cannot get any agents.(%s)' % agents)
+        self.assertGreater(len(agents), 0,
+                           'Cannot get any agents.(%s)' % agents)
         self.assertIn(body['agent_id'], map(lambda x: x['agent_id'], agents))
 
     @test.idempotent_id('eabadde4-3cd7-4ec4-a4b5-5a936d2d4408')
@@ -108,7 +109,8 @@
         agent_id_xen = agent_xen['agent_id']
         agents = (self.client.list_agents(hypervisor=agent_xen['hypervisor'])
                   ['agents'])
-        self.assertTrue(len(agents) > 0, 'Cannot get any agents.(%s)' % agents)
+        self.assertGreater(len(agents), 0,
+                           'Cannot get any agents.(%s)' % agents)
         self.assertIn(agent_id_xen, map(lambda x: x['agent_id'], agents))
         self.assertNotIn(body['agent_id'], map(lambda x: x['agent_id'],
                                                agents))
diff --git a/tempest/api/compute/admin/test_aggregates_negative.py b/tempest/api/compute/admin/test_aggregates_negative.py
index 3c4e313..609eae6 100644
--- a/tempest/api/compute/admin/test_aggregates_negative.py
+++ b/tempest/api/compute/admin/test_aggregates_negative.py
@@ -40,6 +40,13 @@
                  for host in hosts_all if host['service'] == 'compute'])
         cls.host = hosts[0]
 
+    def _create_test_aggregate(self):
+        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
+        aggregate = (self.client.create_aggregate(name=aggregate_name)
+                     ['aggregate'])
+        self.addCleanup(self.client.delete_aggregate, aggregate['id'])
+        return aggregate
+
     @test.attr(type=['negative'])
     @test.idempotent_id('86a1cb14-da37-4a70-b056-903fd56dfe29')
     def test_aggregate_create_as_user(self):
@@ -70,24 +77,16 @@
     @test.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
-        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
-        aggregate = self.client.create_aggregate(name=aggregate_name)
-        self.addCleanup(self.client.delete_aggregate,
-                        aggregate['aggregate']['id'])
-
+        aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.Conflict,
                           self.client.create_aggregate,
-                          name=aggregate_name)
+                          name=aggregate['name'])
 
     @test.attr(type=['negative'])
     @test.idempotent_id('cd6de795-c15d-45f1-8d9e-813c6bb72a3d')
     def test_aggregate_delete_as_user(self):
         # Regular user is not allowed to delete an aggregate.
-        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
-        aggregate = (self.client.create_aggregate(name=aggregate_name)
-                     ['aggregate'])
-        self.addCleanup(self.client.delete_aggregate, aggregate['id'])
-
+        aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.Forbidden,
                           self.user_client.delete_aggregate,
                           aggregate['id'])
@@ -103,11 +102,7 @@
     @test.idempotent_id('557cad12-34c9-4ff4-95f0-22f0dfbaf7dc')
     def test_aggregate_get_details_as_user(self):
         # Regular user is not allowed to get aggregate details.
-        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
-        aggregate = (self.client.create_aggregate(name=aggregate_name)
-                     ['aggregate'])
-        self.addCleanup(self.client.delete_aggregate, aggregate['id'])
-
+        aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.Forbidden,
                           self.user_client.show_aggregate,
                           aggregate['id'])
@@ -136,12 +131,7 @@
             non_exist_host = data_utils.rand_name('nonexist_host')
             if non_exist_host not in hosts:
                 break
-
-        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
-        aggregate = (self.client.create_aggregate(name=aggregate_name)
-                     ['aggregate'])
-        self.addCleanup(self.client.delete_aggregate, aggregate['id'])
-
+        aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.NotFound, self.client.add_host,
                           aggregate['id'], host=non_exist_host)
 
@@ -149,11 +139,7 @@
     @test.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.
-        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
-        aggregate = (self.client.create_aggregate(name=aggregate_name)
-                     ['aggregate'])
-        self.addCleanup(self.client.delete_aggregate, aggregate['id'])
-
+        aggregate = self._create_test_aggregate()
         self.assertRaises(lib_exc.Forbidden,
                           self.user_client.add_host,
                           aggregate['id'], host=self.host)
@@ -162,10 +148,7 @@
     @test.idempotent_id('19dd44e1-c435-4ee1-a402-88c4f90b5950')
     def test_aggregate_add_existent_host(self):
         self.useFixture(fixtures.LockFixture('availability_zone'))
-        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
-        aggregate = (self.client.create_aggregate(name=aggregate_name)
-                     ['aggregate'])
-        self.addCleanup(self.client.delete_aggregate, aggregate['id'])
+        aggregate = self._create_test_aggregate()
 
         self.client.add_host(aggregate['id'], host=self.host)
         self.addCleanup(self.client.remove_host, aggregate['id'],
@@ -179,10 +162,8 @@
     def test_aggregate_remove_host_as_user(self):
         # Regular user is not allowed to remove a host from an aggregate.
         self.useFixture(fixtures.LockFixture('availability_zone'))
-        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
-        aggregate = (self.client.create_aggregate(name=aggregate_name)
-                     ['aggregate'])
-        self.addCleanup(self.client.delete_aggregate, aggregate['id'])
+        aggregate = self._create_test_aggregate()
+
         self.client.add_host(aggregate['id'], host=self.host)
         self.addCleanup(self.client.remove_host, aggregate['id'],
                         host=self.host)
@@ -194,11 +175,8 @@
     @test.attr(type=['negative'])
     @test.idempotent_id('95d6a6fa-8da9-4426-84d0-eec0329f2e4d')
     def test_aggregate_remove_nonexistent_host(self):
-        non_exist_host = data_utils.rand_name('nonexist_host')
-        aggregate_name = data_utils.rand_name(self.aggregate_name_prefix)
-        aggregate = (self.client.create_aggregate(name=aggregate_name)
-                     ['aggregate'])
-        self.addCleanup(self.client.delete_aggregate, aggregate['id'])
+        aggregate = self._create_test_aggregate()
 
+        non_exist_host = data_utils.rand_name('nonexist_host')
         self.assertRaises(lib_exc.NotFound, self.client.remove_host,
                           aggregate['id'], host=non_exist_host)
diff --git a/tempest/api/compute/admin/test_auto_allocate_network.py b/tempest/api/compute/admin/test_auto_allocate_network.py
index ee8ed14..4eb3376 100644
--- a/tempest/api/compute/admin/test_auto_allocate_network.py
+++ b/tempest/api/compute/admin/test_auto_allocate_network.py
@@ -66,7 +66,6 @@
     @classmethod
     def setup_clients(cls):
         super(AutoAllocateNetworkTest, cls).setup_clients()
-        cls.servers_client = cls.servers_client
         cls.networks_client = cls.os.networks_client
         cls.routers_client = cls.os.routers_client
         cls.subnets_client = cls.os.subnets_client
diff --git a/tempest/api/compute/admin/test_floating_ips_bulk.py b/tempest/api/compute/admin/test_floating_ips_bulk.py
index e207aed..a4695b0 100644
--- a/tempest/api/compute/admin/test_floating_ips_bulk.py
+++ b/tempest/api/compute/admin/test_floating_ips_bulk.py
@@ -17,6 +17,7 @@
 
 from tempest.api.compute import base
 from tempest import config
+from tempest.lib.common.utils import test_utils
 from tempest.lib import exceptions
 from tempest import test
 
@@ -54,12 +55,6 @@
                 raise exceptions.InvalidConfiguration(msg)
         return
 
-    def _delete_floating_ips_bulk(self, ip_range):
-        try:
-            self.client.delete_floating_ips_bulk(ip_range)
-        except Exception:
-            pass
-
     @test.idempotent_id('2c8f145f-8012-4cb8-ac7e-95a587f0e4ab')
     @test.services('network')
     def test_create_list_delete_floating_ips_bulk(self):
@@ -73,7 +68,8 @@
                                                      pool,
                                                      interface)
                 ['floating_ips_bulk_create'])
-        self.addCleanup(self._delete_floating_ips_bulk, self.ip_range)
+        self.addCleanup(test_utils.call_and_ignore_notfound_exc,
+                        self.client.delete_floating_ips_bulk, self.ip_range)
         self.assertEqual(self.ip_range, body['ip_range'])
         ips_list = self.client.list_floating_ips_bulk()['floating_ip_info']
         self.assertNotEqual(0, len(ips_list))
diff --git a/tempest/api/compute/admin/test_hosts.py b/tempest/api/compute/admin/test_hosts.py
index 29e1eb8..3797b29 100644
--- a/tempest/api/compute/admin/test_hosts.py
+++ b/tempest/api/compute/admin/test_hosts.py
@@ -28,7 +28,7 @@
     @test.idempotent_id('9bfaf98d-e2cb-44b0-a07e-2558b2821e4f')
     def test_list_hosts(self):
         hosts = self.client.list_hosts()['hosts']
-        self.assertTrue(len(hosts) >= 2, str(hosts))
+        self.assertGreaterEqual(len(hosts), 2, str(hosts))
 
     @test.idempotent_id('5dc06f5b-d887-47a2-bb2a-67762ef3c6de')
     def test_list_hosts_with_zone(self):
diff --git a/tempest/api/compute/admin/test_hosts_negative.py b/tempest/api/compute/admin/test_hosts_negative.py
index c270829..3821b22 100644
--- a/tempest/api/compute/admin/test_hosts_negative.py
+++ b/tempest/api/compute/admin/test_hosts_negative.py
@@ -13,7 +13,6 @@
 #    under the License.
 
 from tempest.api.compute import base
-from tempest.common.utils import data_utils
 from tempest.lib import exceptions as lib_exc
 from tempest import test
 
@@ -27,11 +26,13 @@
         cls.client = cls.os_adm.hosts_client
         cls.non_admin_client = cls.os.hosts_client
 
-    def _get_host_name(self):
-        hosts = self.client.list_hosts()['hosts']
-        self.assertGreaterEqual(len(hosts), 1)
-        hostname = hosts[0]['host_name']
-        return hostname
+    @classmethod
+    def resource_setup(cls):
+        super(HostsAdminNegativeTestJSON, cls).resource_setup()
+        hosts = cls.client.list_hosts()['hosts']
+        if not hosts:
+            raise lib_exc.NotFound("no host found")
+        cls.hostname = hosts[0]['host_name']
 
     @test.attr(type=['negative'])
     @test.idempotent_id('dd032027-0210-4d9c-860e-69b1b8deed5f')
@@ -42,27 +43,22 @@
     @test.attr(type=['negative'])
     @test.idempotent_id('e75b0a1a-041f-47a1-8b4a-b72a6ff36d3f')
     def test_show_host_detail_with_nonexistent_hostname(self):
-        nonexitent_hostname = data_utils.rand_name('rand_hostname')
         self.assertRaises(lib_exc.NotFound,
-                          self.client.show_host, nonexitent_hostname)
+                          self.client.show_host, 'nonexistent_hostname')
 
     @test.attr(type=['negative'])
     @test.idempotent_id('19ebe09c-bfd4-4b7c-81a2-e2e0710f59cc')
     def test_show_host_detail_with_non_admin_user(self):
-        hostname = self._get_host_name()
-
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.show_host,
-                          hostname)
+                          self.hostname)
 
     @test.attr(type=['negative'])
     @test.idempotent_id('e40c72b1-0239-4ed6-ba21-81a184df1f7c')
     def test_update_host_with_non_admin_user(self):
-        hostname = self._get_host_name()
-
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.update_host,
-                          hostname,
+                          self.hostname,
                           status='enable',
                           maintenance_mode='enable')
 
@@ -70,11 +66,9 @@
     @test.idempotent_id('fbe2bf3e-3246-4a95-a59f-94e4e298ec77')
     def test_update_host_with_invalid_status(self):
         # 'status' can only be 'enable' or 'disable'
-        hostname = self._get_host_name()
-
         self.assertRaises(lib_exc.BadRequest,
                           self.client.update_host,
-                          hostname,
+                          self.hostname,
                           status='invalid',
                           maintenance_mode='enable')
 
@@ -82,11 +76,9 @@
     @test.idempotent_id('ab1e230e-5e22-41a9-8699-82b9947915d4')
     def test_update_host_with_invalid_maintenance_mode(self):
         # 'maintenance_mode' can only be 'enable' or 'disable'
-        hostname = self._get_host_name()
-
         self.assertRaises(lib_exc.BadRequest,
                           self.client.update_host,
-                          hostname,
+                          self.hostname,
                           status='enable',
                           maintenance_mode='invalid')
 
@@ -94,73 +86,57 @@
     @test.idempotent_id('0cd85f75-6992-4a4a-b1bd-d11e37fd0eee')
     def test_update_host_without_param(self):
         # 'status' or 'maintenance_mode' needed for host update
-        hostname = self._get_host_name()
-
         self.assertRaises(lib_exc.BadRequest,
                           self.client.update_host,
-                          hostname)
+                          self.hostname)
 
     @test.attr(type=['negative'])
     @test.idempotent_id('23c92146-2100-4d68-b2d6-c7ade970c9c1')
     def test_update_nonexistent_host(self):
-        nonexitent_hostname = data_utils.rand_name('rand_hostname')
-
         self.assertRaises(lib_exc.NotFound,
                           self.client.update_host,
-                          nonexitent_hostname,
+                          'nonexistent_hostname',
                           status='enable',
                           maintenance_mode='enable')
 
     @test.attr(type=['negative'])
     @test.idempotent_id('0d981ac3-4320-4898-b674-82b61fbb60e4')
     def test_startup_nonexistent_host(self):
-        nonexitent_hostname = data_utils.rand_name('rand_hostname')
-
         self.assertRaises(lib_exc.NotFound,
                           self.client.startup_host,
-                          nonexitent_hostname)
+                          'nonexistent_hostname')
 
     @test.attr(type=['negative'])
     @test.idempotent_id('9f4ebb7e-b2ae-4e5b-a38f-0fd1bb0ddfca')
     def test_startup_host_with_non_admin_user(self):
-        hostname = self._get_host_name()
-
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.startup_host,
-                          hostname)
+                          self.hostname)
 
     @test.attr(type=['negative'])
     @test.idempotent_id('9e637444-29cf-4244-88c8-831ae82c31b6')
     def test_shutdown_nonexistent_host(self):
-        nonexitent_hostname = data_utils.rand_name('rand_hostname')
-
         self.assertRaises(lib_exc.NotFound,
                           self.client.shutdown_host,
-                          nonexitent_hostname)
+                          'nonexistent_hostname')
 
     @test.attr(type=['negative'])
     @test.idempotent_id('a803529c-7e3f-4d3c-a7d6-8e1c203d27f6')
     def test_shutdown_host_with_non_admin_user(self):
-        hostname = self._get_host_name()
-
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.shutdown_host,
-                          hostname)
+                          self.hostname)
 
     @test.attr(type=['negative'])
     @test.idempotent_id('f86bfd7b-0b13-4849-ae29-0322e83ee58b')
     def test_reboot_nonexistent_host(self):
-        nonexitent_hostname = data_utils.rand_name('rand_hostname')
-
         self.assertRaises(lib_exc.NotFound,
                           self.client.reboot_host,
-                          nonexitent_hostname)
+                          'nonexistent_hostname')
 
     @test.attr(type=['negative'])
     @test.idempotent_id('02d79bb9-eb57-4612-abf6-2cb38897d2f8')
     def test_reboot_host_with_non_admin_user(self):
-        hostname = self._get_host_name()
-
         self.assertRaises(lib_exc.Forbidden,
                           self.non_admin_client.reboot_host,
-                          hostname)
+                          self.hostname)
diff --git a/tempest/api/compute/admin/test_hypervisor.py b/tempest/api/compute/admin/test_hypervisor.py
index 92a9135..55134b1 100644
--- a/tempest/api/compute/admin/test_hypervisor.py
+++ b/tempest/api/compute/admin/test_hypervisor.py
@@ -31,7 +31,7 @@
         return hypers
 
     def assertHypervisors(self, hypers):
-        self.assertTrue(len(hypers) > 0, "No hypervisors found: %s" % hypers)
+        self.assertGreater(len(hypers), 0, "No hypervisors found: %s" % hypers)
 
     @test.idempotent_id('7f0ceacd-c64d-4e96-b8ee-d02943142cc5')
     def test_get_hypervisor_list(self):
diff --git a/tempest/api/compute/admin/test_quotas.py b/tempest/api/compute/admin/test_quotas.py
index 7d97ce2..ce0adb4 100644
--- a/tempest/api/compute/admin/test_quotas.py
+++ b/tempest/api/compute/admin/test_quotas.py
@@ -74,7 +74,8 @@
                          'ram': 10240, 'floating_ips': 20, 'fixed_ips': 10,
                          'key_pairs': 200, 'injected_file_path_bytes': 512,
                          'instances': 20, 'security_group_rules': 20,
-                         'cores': 2, 'security_groups': 20}
+                         'cores': 2, 'security_groups': 20,
+                         'server_groups': 20, 'server_group_members': 20}
         # Update limits for all quota resources
         quota_set = self.adm_client.update_quota_set(
             self.demo_tenant_id,
@@ -82,13 +83,6 @@
             **new_quota_set)['quota_set']
 
         default_quota_set.pop('id')
-        # NOTE(PhilDay) The following is safe as we're not updating these
-        # two quota values yet.  Once the Nova change to add these is merged
-        # and the client updated to support them this can be removed
-        if 'server_groups' in default_quota_set:
-            default_quota_set.pop('server_groups')
-        if 'server_group_members' in default_quota_set:
-            default_quota_set.pop('server_group_members')
         self.addCleanup(self.adm_client.update_quota_set,
                         self.demo_tenant_id, **default_quota_set)
         for quota in new_quota_set:
diff --git a/tempest/api/compute/admin/test_quotas_negative.py b/tempest/api/compute/admin/test_quotas_negative.py
index d6aba5b..015e14d 100644
--- a/tempest/api/compute/admin/test_quotas_negative.py
+++ b/tempest/api/compute/admin/test_quotas_negative.py
@@ -40,6 +40,17 @@
         # tenant most of them should be skipped if we can't do that
         cls.demo_tenant_id = cls.client.tenant_id
 
+    def _update_quota(self, quota_item, quota_value):
+        quota_set = (self.adm_client.show_quota_set(self.demo_tenant_id)
+                     ['quota_set'])
+        default_quota_value = quota_set[quota_item]
+
+        self.adm_client.update_quota_set(self.demo_tenant_id,
+                                         force=True,
+                                         **{quota_item: quota_value})
+        self.addCleanup(self.adm_client.update_quota_set, self.demo_tenant_id,
+                        **{quota_item: default_quota_value})
+
     @test.attr(type=['negative'])
     @test.idempotent_id('733abfe8-166e-47bb-8363-23dbd7ff3476')
     def test_update_quota_normal_user(self):
@@ -54,17 +65,7 @@
     @test.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
-        quota_set = (self.adm_client.show_quota_set(self.demo_tenant_id)
-                     ['quota_set'])
-        default_vcpu_quota = quota_set['cores']
-        vcpu_quota = 0  # Set the quota to zero to conserve resources
-
-        self.adm_client.update_quota_set(self.demo_tenant_id,
-                                         force=True,
-                                         cores=vcpu_quota)
-
-        self.addCleanup(self.adm_client.update_quota_set, self.demo_tenant_id,
-                        cores=default_vcpu_quota)
+        self._update_quota('cores', 0)
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.create_test_server)
 
@@ -72,17 +73,7 @@
     @test.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
-        quota_set = (self.adm_client.show_quota_set(self.demo_tenant_id)
-                     ['quota_set'])
-        default_mem_quota = quota_set['ram']
-        mem_quota = 0  # Set the quota to zero to conserve resources
-
-        self.adm_client.update_quota_set(self.demo_tenant_id,
-                                         force=True,
-                                         ram=mem_quota)
-
-        self.addCleanup(self.adm_client.update_quota_set, self.demo_tenant_id,
-                        ram=default_mem_quota)
+        self._update_quota('ram', 0)
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.create_test_server)
 
@@ -90,16 +81,7 @@
     @test.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
-        quota_set = (self.adm_client.show_quota_set(self.demo_tenant_id)
-                     ['quota_set'])
-        default_instances_quota = quota_set['instances']
-        instances_quota = 0  # Set quota to zero to disallow server creation
-
-        self.adm_client.update_quota_set(self.demo_tenant_id,
-                                         force=True,
-                                         instances=instances_quota)
-        self.addCleanup(self.adm_client.update_quota_set, self.demo_tenant_id,
-                        instances=default_instances_quota)
+        self._update_quota('instances', 0)
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.create_test_server)
 
@@ -109,22 +91,10 @@
     @test.services('network')
     def test_security_groups_exceed_limit(self):
         # Negative test: Creation Security Groups over limit should FAIL
-
-        quota_set = (self.adm_client.show_quota_set(self.demo_tenant_id)
-                     ['quota_set'])
-        default_sg_quota = quota_set['security_groups']
-
         # Set the quota to number of used security groups
         sg_quota = self.limits_client.show_limits()['limits']['absolute'][
             'totalSecurityGroupsUsed']
-
-        self.adm_client.update_quota_set(self.demo_tenant_id,
-                                         force=True,
-                                         security_groups=sg_quota)
-
-        self.addCleanup(self.adm_client.update_quota_set,
-                        self.demo_tenant_id,
-                        security_groups=default_sg_quota)
+        self._update_quota('security_groups', sg_quota)
 
         # Check we cannot create anymore
         # A 403 Forbidden or 413 Overlimit (old behaviour) exception
@@ -141,19 +111,7 @@
     def test_security_groups_rules_exceed_limit(self):
         # Negative test: Creation of Security Group Rules should FAIL
         # when we reach limit maxSecurityGroupRules
-
-        quota_set = (self.adm_client.show_quota_set(self.demo_tenant_id)
-                     ['quota_set'])
-        default_sg_rules_quota = quota_set['security_group_rules']
-        sg_rules_quota = 0  # Set the quota to zero to conserve resources
-
-        self.adm_client.update_quota_set(self.demo_tenant_id,
-                                         force=True,
-                                         security_group_rules=sg_rules_quota)
-
-        self.addCleanup(self.adm_client.update_quota_set,
-                        self.demo_tenant_id,
-                        security_group_rules=default_sg_rules_quota)
+        self._update_quota('security_group_rules', 0)
 
         s_name = data_utils.rand_name('securitygroup')
         s_description = data_utils.rand_name('description')
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index b738e82..d8294f7 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -365,7 +365,7 @@
                     return address['addr']
             raise exceptions.ServerUnreachable(server_id=server['id'])
         else:
-            raise exceptions.InvalidConfiguration()
+            raise lib_exc.InvalidConfiguration()
 
     def setUp(self):
         super(BaseV2ComputeTest, self).setUp()
diff --git a/tempest/api/compute/images/test_image_metadata.py b/tempest/api/compute/images/test_image_metadata.py
index 999233d..26d4efe 100644
--- a/tempest/api/compute/images/test_image_metadata.py
+++ b/tempest/api/compute/images/test_image_metadata.py
@@ -20,7 +20,7 @@
 from tempest.common.utils import data_utils
 from tempest.common import waiters
 from tempest import config
-from tempest import exceptions
+from tempest.lib import exceptions
 from tempest import test
 
 CONF = config.CONF
diff --git a/tempest/api/compute/images/test_images.py b/tempest/api/compute/images/test_images.py
index 154d717..a06f4a7 100644
--- a/tempest/api/compute/images/test_images.py
+++ b/tempest/api/compute/images/test_images.py
@@ -38,7 +38,6 @@
     def setup_clients(cls):
         super(ImagesTestJSON, cls).setup_clients()
         cls.client = cls.compute_images_client
-        cls.servers_client = cls.servers_client
 
     @test.idempotent_id('aa06b52b-2db5-4807-b218-9441f75d74e3')
     def test_delete_saving_image(self):
diff --git a/tempest/api/compute/images/test_images_negative.py b/tempest/api/compute/images/test_images_negative.py
index 8db094d..7035401 100644
--- a/tempest/api/compute/images/test_images_negative.py
+++ b/tempest/api/compute/images/test_images_negative.py
@@ -39,7 +39,6 @@
     def setup_clients(cls):
         super(ImagesNegativeTestJSON, cls).setup_clients()
         cls.client = cls.compute_images_client
-        cls.servers_client = cls.servers_client
 
     @test.attr(type=['negative'])
     @test.idempotent_id('6cd5a89d-5b47-46a7-93bc-3916f0d84973')
diff --git a/tempest/api/compute/images/test_images_oneserver.py b/tempest/api/compute/images/test_images_oneserver.py
index 6c417f1..19e2880 100644
--- a/tempest/api/compute/images/test_images_oneserver.py
+++ b/tempest/api/compute/images/test_images_oneserver.py
@@ -45,35 +45,18 @@
         super(ImagesOneServerTestJSON, cls).setup_clients()
         cls.client = cls.compute_images_client
 
-    @classmethod
-    def resource_setup(cls):
-        super(ImagesOneServerTestJSON, cls).resource_setup()
-        server = cls.create_test_server(wait_until='ACTIVE')
-        cls.server_id = server['id']
-
     def _get_default_flavor_disk_size(self, flavor_id):
         flavor = self.flavors_client.show_flavor(flavor_id)['flavor']
         return flavor['disk']
 
-    @classmethod
-    def _rebuild_server_when_fails(cls, server_id):
-        try:
-            waiters.wait_for_server_status(cls.servers_client,
-                                           server_id, 'ACTIVE')
-        except Exception:
-            LOG.exception('server %s timed out to become ACTIVE. rebuilding'
-                          % server_id)
-            # Rebuild server if cannot reach the ACTIVE state
-            # Usually it means the server had a serious accident
-            cls.server_id = cls.rebuild_server(server_id)
-
     @test.idempotent_id('3731d080-d4c5-4872-b41a-64d0d0021314')
     def test_create_delete_image(self):
+        server_id = self.create_test_server(wait_until='ACTIVE')['id']
 
         # Create a new image
         name = data_utils.rand_name('image')
         meta = {'image_type': 'test'}
-        body = self.client.create_image(self.server_id, name=name,
+        body = self.client.create_image(server_id, name=name,
                                         metadata=meta)
         image_id = data_utils.parse_image_id(body.response['location'])
         self.addCleanup(test_utils.call_and_ignore_notfound_exc,
@@ -98,10 +81,11 @@
         # Verify the image was deleted correctly
         self.client.delete_image(image_id)
         self.client.wait_for_resource_deletion(image_id)
-        self.addCleanup(self._rebuild_server_when_fails, self.server_id)
 
     @test.idempotent_id('3b7c6fe4-dfe7-477c-9243-b06359db51e6')
     def test_create_image_specify_multibyte_character_image_name(self):
+        server_id = self.create_test_server(wait_until='ACTIVE')['id']
+
         # prefix character is:
         # http://www.fileformat.info/info/unicode/char/1F4A9/index.htm
 
@@ -109,7 +93,6 @@
         # #1370954 in glance which will 500 if mysql is used as the
         # backend and it attempts to store a 4 byte utf-8 character
         utf8_name = data_utils.rand_name('\xe2\x82\xa1')
-        body = self.client.create_image(self.server_id, name=utf8_name)
+        body = self.client.create_image(server_id, name=utf8_name)
         image_id = data_utils.parse_image_id(body.response['location'])
         self.addCleanup(self.client.delete_image, image_id)
-        self.addCleanup(self._rebuild_server_when_fails, self.server_id)
diff --git a/tempest/api/compute/keypairs/test_keypairs.py b/tempest/api/compute/keypairs/test_keypairs.py
index be6f615..562a508 100644
--- a/tempest/api/compute/keypairs/test_keypairs.py
+++ b/tempest/api/compute/keypairs/test_keypairs.py
@@ -57,8 +57,8 @@
         self.assertEqual(key_name, k_name,
                          "The created keypair name is not equal "
                          "to the requested name")
-        self.assertTrue(private_key is not None,
-                        "Field private_key is empty or not found.")
+        self.assertIsNotNone(private_key,
+                             "Field private_key is empty or not found.")
 
     @test.idempotent_id('a4233d5d-52d8-47cc-9a25-e1864527e3df')
     def test_get_keypair_detail(self):
@@ -72,8 +72,8 @@
                          "The created keypair name is not equal "
                          "to requested name")
         public_key = keypair_detail['public_key']
-        self.assertTrue(public_key is not None,
-                        "Field public_key is empty or not found.")
+        self.assertIsNotNone(public_key,
+                             "Field public_key is empty or not found.")
 
     @test.idempotent_id('39c90c6a-304a-49dd-95ec-2366129def05')
     def test_keypair_create_with_pub_key(self):
@@ -89,7 +89,7 @@
                    "XcPojYN56tI0OlrGqojbediJYD0rUsJu4weZpbn8vilb3JuDY+jws"
                    "snSA8wzBx3A/8y9Pp1B nova@ubuntu")
         keypair = self._create_keypair(k_name, pub_key)
-        self.assertFalse('private_key' in keypair,
+        self.assertNotIn('private_key', keypair,
                          "Field private_key is not empty!")
         key_name = keypair['name']
         self.assertEqual(key_name, k_name,
diff --git a/tempest/api/compute/servers/test_server_actions.py b/tempest/api/compute/servers/test_server_actions.py
index 9077801..50910ec 100644
--- a/tempest/api/compute/servers/test_server_actions.py
+++ b/tempest/api/compute/servers/test_server_actions.py
@@ -131,8 +131,8 @@
                 server=server,
                 servers_client=self.client)
             new_boot_time = linux_client.get_boot_time()
-            self.assertTrue(new_boot_time > boot_time,
-                            '%s > %s' % (new_boot_time, boot_time))
+            self.assertGreater(new_boot_time, boot_time,
+                               '%s > %s' % (new_boot_time, boot_time))
 
     @test.attr(type='smoke')
     @test.idempotent_id('2cb1baf6-ac8d-4429-bf0d-ba8a0ba53e32')
@@ -458,8 +458,8 @@
 
             # NOTE: This test tries to get full length console log, and the
             # length should be bigger than the one of test_get_console_output.
-            self.assertTrue(lines > 10, "Cannot get enough console log length."
-                                        " (lines: %s)" % lines)
+            self.assertGreater(lines, 10, "Cannot get enough console log "
+                                          "length. (lines: %s)" % lines)
 
         self.wait_for(_check_full_length_console_log)
 
diff --git a/tempest/api/compute/servers/test_server_metadata.py b/tempest/api/compute/servers/test_server_metadata.py
index cb66e81..847b7a1 100644
--- a/tempest/api/compute/servers/test_server_metadata.py
+++ b/tempest/api/compute/servers/test_server_metadata.py
@@ -23,7 +23,6 @@
     def setup_clients(cls):
         super(ServerMetadataTestJSON, cls).setup_clients()
         cls.client = cls.servers_client
-        cls.quotas = cls.quotas_client
 
     @classmethod
     def resource_setup(cls):
diff --git a/tempest/api/compute/servers/test_server_metadata_negative.py b/tempest/api/compute/servers/test_server_metadata_negative.py
index aae9101..62b8962 100644
--- a/tempest/api/compute/servers/test_server_metadata_negative.py
+++ b/tempest/api/compute/servers/test_server_metadata_negative.py
@@ -25,7 +25,6 @@
     def setup_clients(cls):
         super(ServerMetadataNegativeTestJSON, cls).setup_clients()
         cls.client = cls.servers_client
-        cls.quotas = cls.quotas_client
 
     @classmethod
     def resource_setup(cls):
@@ -134,7 +133,8 @@
         # A 403 Forbidden or 413 Overlimit (old behaviour) exception
         # will be raised while exceeding metadata items limit for
         # tenant.
-        quota_set = self.quotas.show_quota_set(self.tenant_id)['quota_set']
+        quota_set = self.quotas_client.show_quota_set(
+            self.tenant_id)['quota_set']
         quota_metadata = quota_set['metadata_items']
         if quota_metadata == -1:
             raise self.skipException("No limit for metadata_items")
diff --git a/tempest/api/compute/volumes/test_volume_snapshots.py b/tempest/api/compute/volumes/test_volume_snapshots.py
index 460c882..01718cc 100644
--- a/tempest/api/compute/volumes/test_volume_snapshots.py
+++ b/tempest/api/compute/volumes/test_volume_snapshots.py
@@ -13,6 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import testtools
+
 from tempest.api.compute import base
 from tempest.common.utils import data_utils
 from tempest.common import waiters
@@ -39,6 +41,8 @@
         cls.snapshots_client = cls.snapshots_extensions_client
 
     @test.idempotent_id('cd4ec87d-7825-450d-8040-6e2068f2da8f')
+    @testtools.skipUnless(CONF.volume_feature_enabled.snapshot,
+                          'Cinder volume snapshots are disabled')
     def test_volume_snapshot_create_get_list_delete(self):
         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 d599431..7549d4a 100644
--- a/tempest/api/compute/volumes/test_volumes_get.py
+++ b/tempest/api/compute/volumes/test_volumes_get.py
@@ -54,8 +54,8 @@
         self.assertEqual(volume['displayName'], v_name,
                          "The created volume name is not equal "
                          "to the requested name")
-        self.assertTrue(volume['id'] is not None,
-                        "Field volume id is empty or not found.")
+        self.assertIsNotNone(volume['id'],
+                             "Field volume id is empty or not found.")
         # Wait for Volume status to become ACTIVE
         waiters.wait_for_volume_status(self.client, volume['id'], 'available')
         # GET Volume
diff --git a/tempest/api/identity/admin/v2/test_services.py b/tempest/api/identity/admin/v2/test_services.py
index 3ed51f0..7973a03 100644
--- a/tempest/api/identity/admin/v2/test_services.py
+++ b/tempest/api/identity/admin/v2/test_services.py
@@ -38,7 +38,7 @@
         service_data = self.services_client.create_service(
             name=name, type=s_type,
             description=description)['OS-KSADM:service']
-        self.assertFalse(service_data['id'] is None)
+        self.assertIsNotNone(service_data['id'])
         self.addCleanup(self._del_service, service_data['id'])
         # Verifying response body of create service
         self.assertIn('id', service_data)
diff --git a/tempest/api/image/v1/test_images.py b/tempest/api/image/v1/test_images.py
index 7d52695..9fbdcd7 100644
--- a/tempest/api/image/v1/test_images.py
+++ b/tempest/api/image/v1/test_images.py
@@ -238,7 +238,7 @@
     def test_index_max_size(self):
         images_list = self.client.list_images(size_max=42)['images']
         for image in images_list:
-            self.assertTrue(image['size'] <= 42)
+            self.assertLessEqual(image['size'], 42)
         result_set = set(map(lambda x: x['id'], images_list))
         self.assertTrue(self.size42_set <= result_set)
         self.assertFalse(self.created_set - self.size42_set <= result_set)
@@ -261,7 +261,7 @@
         top_size = images_list[0]['size']  # We have non-zero sized images
         for image in images_list:
             size = image['size']
-            self.assertTrue(size <= top_size)
+            self.assertLessEqual(size, top_size)
             top_size = size
             self.assertEqual(image['status'], 'active')
 
diff --git a/tempest/api/image/v2/test_images.py b/tempest/api/image/v2/test_images.py
index 6f8d239..5cf8084 100644
--- a/tempest/api/image/v2/test_images.py
+++ b/tempest/api/image/v2/test_images.py
@@ -224,9 +224,10 @@
         image_size_list = map(lambda x: x['size'], images_list)
 
         for image_size in image_size_list:
-            self.assertTrue(image_size >= params['size_min'] and
-                            image_size <= params['size_max'],
-                            "Failed to get images by size_min and size_max")
+            self.assertGreaterEqual(image_size, params['size_min'],
+                                    "Failed to get images by size_min")
+            self.assertLessEqual(image_size, params['size_max'],
+                                 "Failed to get images by size_max")
 
     @test.idempotent_id('7fc9e369-0f58-4d05-9aa5-0969e2d59d15')
     def test_list_images_param_status(self):
diff --git a/tempest/api/network/admin/test_routers_dvr.py b/tempest/api/network/admin/test_routers_dvr.py
index 66feba8..aaac921 100644
--- a/tempest/api/network/admin/test_routers_dvr.py
+++ b/tempest/api/network/admin/test_routers_dvr.py
@@ -98,15 +98,22 @@
         attribute will be set to True
         """
         name = data_utils.rand_name('router')
+        tenant_id = self.routers_client.tenant_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)
+                                                         ha=False,
+                                                         tenant_id=tenant_id)
+        router_id = router['router']['id']
         self.addCleanup(self.admin_routers_client.delete_router,
-                        router['router']['id'])
+                        router_id)
         self.assertFalse(router['router']['distributed'])
         router = self.admin_routers_client.update_router(
-            router['router']['id'], distributed=True)
+            router_id, distributed=True)
         self.assertTrue(router['router']['distributed'])
+        show_body = self.admin_routers_client.show_router(router_id)
+        self.assertTrue(show_body['router']['distributed'])
+        show_body = self.routers_client.show_router(router_id)
+        self.assertNotIn('distributed', show_body['router'])
diff --git a/tempest/api/network/test_networks.py b/tempest/api/network/test_networks.py
index 6b0c20f..d2056c4 100644
--- a/tempest/api/network/test_networks.py
+++ b/tempest/api/network/test_networks.py
@@ -27,39 +27,11 @@
 CONF = config.CONF
 
 
-class NetworksTest(base.BaseNetworkTest):
-    """Tests the following operations in the Neutron API:
-
-        create a network for a project
-        list project's networks
-        show a project network details
-        create a subnet for a project
-        list project's subnets
-        show a project subnet details
-        network update
-        subnet update
-        delete a network also deletes its subnets
-        list external networks
-
-        All subnet tests are run once with ipv4 and once with ipv6.
-
-    v2.0 of the Neutron API is assumed. It is also assumed that the following
-    options are defined in the [network] section of etc/tempest.conf:
-
-        project_network_cidr with a block of cidr's from which smaller blocks
-        can be allocated for project ipv4 subnets
-
-        project_network_v6_cidr is the equivalent for ipv6 subnets
-
-        project_network_mask_bits with the mask bits to be used to partition
-        the block defined by project_network_cidr
-
-        project_network_v6_mask_bits is the equivalent for ipv6 subnets
-    """
+class BaseNetworkTestResources(base.BaseNetworkTest):
 
     @classmethod
     def resource_setup(cls):
-        super(NetworksTest, cls).resource_setup()
+        super(BaseNetworkTestResources, cls).resource_setup()
         cls.network = cls.create_network()
         cls.name = cls.network['name']
         cls.subnet = cls._create_subnet_with_last_subnet_block(cls.network,
@@ -171,6 +143,37 @@
         self.networks.pop()
         self.subnets.pop()
 
+
+class NetworksTest(BaseNetworkTestResources):
+    """Tests the following operations in the Neutron API:
+
+        create a network for a project
+        list project's networks
+        show a project network details
+        create a subnet for a project
+        list project's subnets
+        show a project subnet details
+        network update
+        subnet update
+        delete a network also deletes its subnets
+        list external networks
+
+        All subnet tests are run once with ipv4 and once with ipv6.
+
+    v2.0 of the Neutron API is assumed. It is also assumed that the following
+    options are defined in the [network] section of etc/tempest.conf:
+
+        project_network_cidr with a block of cidr's from which smaller blocks
+        can be allocated for project ipv4 subnets
+
+        project_network_v6_cidr is the equivalent for ipv6 subnets
+
+        project_network_mask_bits with the mask bits to be used to partition
+        the block defined by project_network_cidr
+
+        project_network_v6_mask_bits is the equivalent for ipv6 subnets
+    """
+
     @test.attr(type='smoke')
     @test.idempotent_id('0e269138-0da6-4efc-a46d-578161e7b221')
     def test_create_update_delete_network_subnet(self):
@@ -559,7 +562,9 @@
                              'Subnet are not in the same network')
 
 
-class NetworksIpV6TestAttrs(NetworksIpV6Test):
+class NetworksIpV6TestAttrs(BaseNetworkTestResources):
+
+    _ip_version = 6
 
     @classmethod
     def skip_checks(cls):
diff --git a/tempest/api/network/test_routers.py b/tempest/api/network/test_routers.py
index de2e71f..ed6a302 100644
--- a/tempest/api/network/test_routers.py
+++ b/tempest/api/network/test_routers.py
@@ -390,35 +390,3 @@
 
 class RoutersIpV6Test(RoutersTest):
     _ip_version = 6
-
-
-class DvrRoutersTest(base.BaseRouterTest):
-
-    @classmethod
-    def skip_checks(cls):
-        super(DvrRoutersTest, cls).skip_checks()
-        if not test.is_extension_enabled('dvr', 'network'):
-            msg = "DVR extension not enabled."
-            raise cls.skipException(msg)
-
-    @test.idempotent_id('141297aa-3424-455d-aa8d-f2d95731e00a')
-    def test_create_distributed_router(self):
-        name = data_utils.rand_name('router')
-        create_body = self.admin_routers_client.create_router(
-            name=name, distributed=True)
-        self.addCleanup(self._delete_router,
-                        create_body['router']['id'],
-                        self.admin_routers_client)
-        self.assertTrue(create_body['router']['distributed'])
-
-    @test.idempotent_id('644d7a4a-01a1-4b68-bb8d-0c0042cb1729')
-    def test_convert_centralized_router(self):
-        router = self._create_router()
-        self.assertNotIn('distributed', router)
-        update_body = self.admin_routers_client.update_router(router['id'],
-                                                              distributed=True)
-        self.assertTrue(update_body['router']['distributed'])
-        show_body = self.admin_routers_client.show_router(router['id'])
-        self.assertTrue(show_body['router']['distributed'])
-        show_body = self.routers_client.show_router(router['id'])
-        self.assertNotIn('distributed', show_body['router'])
diff --git a/tempest/api/object_storage/test_account_bulk.py b/tempest/api/object_storage/test_account_bulk.py
index 7292ee9..a75ed98 100644
--- a/tempest/api/object_storage/test_account_bulk.py
+++ b/tempest/api/object_storage/test_account_bulk.py
@@ -66,7 +66,7 @@
         self.assertNotIn(container_name, body)
 
     @test.idempotent_id('a407de51-1983-47cc-9f14-47c2b059413c')
-    @test.requires_ext(extension='bulk', service='object')
+    @test.requires_ext(extension='bulk_upload', service='object')
     def test_extract_archive(self):
         # Test bulk operation of file upload with an archived file
         filepath, container_name, object_name = self._create_archive()
@@ -102,7 +102,7 @@
         self.assertIn(object_name, [c['name'] for c in contents_list])
 
     @test.idempotent_id('c075e682-0d2a-43b2-808d-4116200d736d')
-    @test.requires_ext(extension='bulk', service='object')
+    @test.requires_ext(extension='bulk_delete', service='object')
     def test_bulk_delete(self):
         # Test bulk operation of deleting multiple files
         filepath, container_name, object_name = self._create_archive()
@@ -129,7 +129,7 @@
         self._check_contents_deleted(container_name)
 
     @test.idempotent_id('dbea2bcb-efbb-4674-ac8a-a5a0e33d1d79')
-    @test.requires_ext(extension='bulk', service='object')
+    @test.requires_ext(extension='bulk_delete', service='object')
     def test_bulk_delete_by_POST(self):
         # Test bulk operation of deleting multiple files
         filepath, container_name, object_name = self._create_archive()
diff --git a/tempest/api/object_storage/test_account_services.py b/tempest/api/object_storage/test_account_services.py
index 33e5852..eda4568 100644
--- a/tempest/api/object_storage/test_account_services.py
+++ b/tempest/api/object_storage/test_account_services.py
@@ -121,7 +121,7 @@
         self.assertHeaders(resp, 'Account', 'GET')
         self.assertIsNotNone(container_list)
         self.assertEqual(container_list.tag, 'account')
-        self.assertTrue('name' in container_list.keys())
+        self.assertIn('name', container_list.keys())
         self.assertEqual(container_list.find(".//container").tag, 'container')
         self.assertEqual(container_list.find(".//name").tag, 'name')
         self.assertEqual(container_list.find(".//count").tag, 'count')
@@ -209,7 +209,8 @@
                 self.account_client.list_account_containers(params=params)
             self.assertHeaders(resp, 'Account', 'GET')
 
-            self.assertTrue(len(container_list) <= limit, str(container_list))
+            self.assertLessEqual(len(container_list), limit,
+                                 str(container_list))
 
     @test.idempotent_id('888a3f0e-7214-4806-8e50-5e0c9a69bb5e')
     def test_list_containers_with_limit_and_end_marker(self):
diff --git a/tempest/api/object_storage/test_container_services.py b/tempest/api/object_storage/test_container_services.py
index dbe8b4a..9ce1b18 100644
--- a/tempest/api/object_storage/test_container_services.py
+++ b/tempest/api/object_storage/test_container_services.py
@@ -205,7 +205,7 @@
 
         self.assertIsNotNone(object_list)
         self.assertEqual(object_list.tag, 'container')
-        self.assertTrue('name' in object_list.keys())
+        self.assertIn('name', object_list.keys())
         self.assertEqual(object_list.find(".//object").tag, 'object')
         self.assertEqual(object_list.find(".//name").tag, 'name')
         self.assertEqual(object_list.find(".//hash").tag, 'hash')
diff --git a/tempest/api/orchestration/stacks/test_nova_keypair_resources.py b/tempest/api/orchestration/stacks/test_nova_keypair_resources.py
index 160bf6f..16d8180 100644
--- a/tempest/api/orchestration/stacks/test_nova_keypair_resources.py
+++ b/tempest/api/orchestration/stacks/test_nova_keypair_resources.py
@@ -83,7 +83,7 @@
                       output_map['KeyPairDontSavePrivate_PublicKey'])
         self.assertIn(u'KeyPairDontSavePrivate_PrivateKey', output_map)
         private_key = output_map['KeyPairDontSavePrivate_PrivateKey']
-        self.assertTrue(len(private_key) == 0)
+        self.assertEqual(0, len(private_key))
 
 
 class NovaKeyPairResourcesAWSTest(NovaKeyPairResourcesYAMLTest):
diff --git a/tempest/api/volume/admin/test_multi_backend.py b/tempest/api/volume/admin/test_multi_backend.py
index 120dbb1..5703313 100644
--- a/tempest/api/volume/admin/test_multi_backend.py
+++ b/tempest/api/volume/admin/test_multi_backend.py
@@ -129,7 +129,7 @@
         volume1_host = volume['os-vol-host-attr:host']
         msg = ("multi-backend reporting incorrect values for volume %s" %
                volume_id)
-        self.assertTrue(len(volume1_host.split("@")) > 1, msg)
+        self.assertGreater(len(volume1_host.split("@")), 1, msg)
 
     def _test_backend_name_distinction(self, volume_id_list):
         # this test checks that the volumes created at setUp don't
diff --git a/tempest/api/volume/admin/test_volume_hosts.py b/tempest/api/volume/admin/test_volume_hosts.py
index b58c525..f6de9a6 100644
--- a/tempest/api/volume/admin/test_volume_hosts.py
+++ b/tempest/api/volume/admin/test_volume_hosts.py
@@ -22,8 +22,8 @@
     @test.idempotent_id('d5f3efa2-6684-4190-9ced-1c2f526352ad')
     def test_list_hosts(self):
         hosts = self.admin_hosts_client.list_hosts()['hosts']
-        self.assertTrue(len(hosts) >= 2, "No. of hosts are < 2,"
-                        "response of list hosts is: % s" % hosts)
+        self.assertGreaterEqual(len(hosts), 2, "No. of hosts are < 2,"
+                                "response of list hosts is: % s" % hosts)
 
 
 class VolumeHostsAdminV1TestsJSON(VolumeHostsAdminV2TestsJSON):
diff --git a/tempest/api/volume/admin/test_volume_types.py b/tempest/api/volume/admin/test_volume_types.py
index 99f0a6b..3098cab 100644
--- a/tempest/api/volume/admin/test_volume_types.py
+++ b/tempest/api/volume/admin/test_volume_types.py
@@ -51,8 +51,7 @@
                   'size': CONF.volume.volume_size}
 
         # Create volume
-        volume = self.volumes_client.create_volume(**params)['volume']
-        self.addCleanup(self.delete_volume, self.volumes_client, volume['id'])
+        volume = self.create_volume(**params)
         self.assertEqual(volume_types[0]['name'], volume["volume_type"])
         self.assertEqual(volume[self.name_field], vol_name,
                          "The created volume name is not equal "
@@ -102,8 +101,8 @@
         self.assertEqual(description, body['description'],
                          "The created volume_type_description name is "
                          "not equal to the requested name")
-        self.assertTrue(body['id'] is not None,
-                        "Field volume_type id is empty or not found.")
+        self.assertIsNotNone(body['id'],
+                             "Field volume_type id is empty or not found.")
         fetched_volume_type = self.admin_volume_types_client.show_volume_type(
             body['id'])['volume_type']
         self.assertEqual(name, fetched_volume_type['name'],
diff --git a/tempest/api/volume/admin/v2/test_volume_type_access.py b/tempest/api/volume/admin/v2/test_volume_type_access.py
index 91ff5af..80dbf12 100644
--- a/tempest/api/volume/admin/v2/test_volume_type_access.py
+++ b/tempest/api/volume/admin/v2/test_volume_type_access.py
@@ -16,7 +16,6 @@
 import operator
 
 from tempest.api.volume import base
-from tempest.common import waiters
 from tempest import config
 from tempest.lib import exceptions as lib_exc
 from tempest import test
@@ -52,13 +51,7 @@
                         project=self.volumes_client.tenant_id)
 
         # Creating a volume from primary tenant
-        volume = self.volumes_client.create_volume(
-            volume_type=volume_type['id'],
-            size=CONF.volume.volume_size)['volume']
-        self.addCleanup(self.delete_volume, self.volumes_client, volume['id'])
-        waiters.wait_for_volume_status(self.volumes_client, volume['id'],
-                                       'available')
-
+        volume = self.create_volume(volume_type=volume_type['id'])
         # Validating the created volume is based on the volume type
         self.assertEqual(volume_type['name'], volume['volume_type'])
 
diff --git a/tempest/api/volume/admin/v3/test_user_messages.py b/tempest/api/volume/admin/v3/test_user_messages.py
index 39a5dfa..257a434 100755
--- a/tempest/api/volume/admin/v3/test_user_messages.py
+++ b/tempest/api/volume/admin/v3/test_user_messages.py
@@ -15,9 +15,7 @@
 
 from tempest.api.volume.v3 import base
 from tempest.common.utils import data_utils
-from tempest.common import waiters
 from tempest import config
-from tempest import exceptions
 from tempest import test
 
 CONF = config.CONF
@@ -47,21 +45,11 @@
                        'vendor_name': bad_vendor}
         vol_type_name = data_utils.rand_name(
             self.__class__.__name__ + '-volume-type')
-        bogus_type = self.admin_volume_types_client.create_volume_type(
-            name=vol_type_name,
-            extra_specs=extra_specs)['volume_type']
-        self.addCleanup(self.admin_volume_types_client.delete_volume_type,
-                        bogus_type['id'])
+        bogus_type = self.create_volume_type(
+            name=vol_type_name, extra_specs=extra_specs)
         params = {'volume_type': bogus_type['id'],
                   'size': CONF.volume.volume_size}
-        volume = self.volumes_client.create_volume(**params)['volume']
-        self.addCleanup(self.delete_volume, self.volumes_client, volume['id'])
-        try:
-            waiters.wait_for_volume_status(self.volumes_client, volume['id'],
-                                           'error')
-        except exceptions.VolumeBuildErrorException:
-            # Error state is expected and desired
-            pass
+        volume = self.create_volume(wait_until="error", **params)
         messages = self.messages_client.list_messages()['messages']
         message_id = None
         for message in messages:
diff --git a/tempest/api/volume/base.py b/tempest/api/volume/base.py
index f36fe4a..cf8a450 100644
--- a/tempest/api/volume/base.py
+++ b/tempest/api/volume/base.py
@@ -108,8 +108,11 @@
         super(BaseVolumeTest, cls).resource_cleanup()
 
     @classmethod
-    def create_volume(cls, **kwargs):
-        """Wrapper utility that returns a test volume."""
+    def create_volume(cls, wait_until='available', **kwargs):
+        """Wrapper utility that returns a test volume.
+
+           :param wait_until: wait till volume status.
+        """
         if 'size' not in kwargs:
             kwargs['size'] = CONF.volume.volume_size
 
@@ -120,8 +123,8 @@
 
         volume = cls.volumes_client.create_volume(**kwargs)['volume']
         cls.volumes.append(volume)
-        waiters.wait_for_volume_status(cls.volumes_client,
-                                       volume['id'], 'available')
+        waiters.wait_for_volume_status(cls.volumes_client, volume['id'],
+                                       wait_until)
         return volume
 
     @classmethod
diff --git a/tempest/api/volume/test_volumes_get.py b/tempest/api/volume/test_volumes_get.py
index 07f799b..51de2be 100644
--- a/tempest/api/volume/test_volumes_get.py
+++ b/tempest/api/volume/test_volumes_get.py
@@ -54,8 +54,8 @@
         self.assertEqual(volume[self.name_field], v_name,
                          "The created volume name is not equal "
                          "to the requested name")
-        self.assertTrue(volume['id'] is not None,
-                        "Field volume id is empty or not found.")
+        self.assertIsNotNone(volume['id'],
+                             "Field volume id is empty or not found.")
         # Get Volume information
         fetched_volume = self.client.show_volume(volume['id'])['volume']
         self.assertEqual(v_name,
diff --git a/tempest/api/volume/v2/test_volumes_list.py b/tempest/api/volume/v2/test_volumes_list.py
index 60a35b0..03996af 100644
--- a/tempest/api/volume/v2/test_volumes_list.py
+++ b/tempest/api/volume/v2/test_volumes_list.py
@@ -73,11 +73,13 @@
             val0 = fetched_volume[0][sort_key]
             val1 = fetched_volume[1][sort_key]
             if sort_dir == 'asc':
-                self.assertTrue(val0 < val1,
-                                "%s < %s" % (val0, val1))
+                self.assertLess(val0, val1,
+                                "list is not in asc order with sort_key: %s."
+                                " %s" % (sort_key, fetched_volume))
             elif sort_dir == 'desc':
-                self.assertTrue(val0 > val1,
-                                "%s > %s" % (val0, val1))
+                self.assertGreater(val0, val1,
+                                   "list is not in desc order with sort_key: "
+                                   "%s. %s" % (sort_key, fetched_volume))
 
         _list_details_with_multiple_params()
         _list_details_with_multiple_params(sort_dir='desc')
diff --git a/tempest/api/volume/v3/base.py b/tempest/api/volume/v3/base.py
index e38f947..31fc1eb 100644
--- a/tempest/api/volume/v3/base.py
+++ b/tempest/api/volume/v3/base.py
@@ -52,7 +52,8 @@
             self.request_microversion))
 
 
-class VolumesV3AdminTest(VolumesV3Test):
+class VolumesV3AdminTest(VolumesV3Test,
+                         base.BaseVolumeAdminTest):
     """Base test case class for all v3 Volume Admin API tests."""
 
     credentials = ['primary', 'admin']
diff --git a/tempest/common/waiters.py b/tempest/common/waiters.py
index 92bce5f..0cf8154 100644
--- a/tempest/common/waiters.py
+++ b/tempest/common/waiters.py
@@ -176,7 +176,7 @@
         time.sleep(client.build_interval)
         body = client.show_volume(volume_id)['volume']
         volume_status = body['status']
-        if volume_status == 'error':
+        if volume_status == 'error' and status != 'error':
             raise exceptions.VolumeBuildErrorException(volume_id=volume_id)
         if volume_status == 'error_restoring':
             raise exceptions.VolumeRestoreErrorException(volume_id=volume_id)
diff --git a/tempest/lib/services/compute/tenant_usages_client.py b/tempest/lib/services/compute/tenant_usages_client.py
index 5a748c7..d0eb1c9 100644
--- a/tempest/lib/services/compute/tenant_usages_client.py
+++ b/tempest/lib/services/compute/tenant_usages_client.py
@@ -24,6 +24,12 @@
 class TenantUsagesClient(base_compute_client.BaseComputeClient):
 
     def list_tenant_usages(self, **params):
+        """List Tenant Usage For All Tenants.
+
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/compute/#list-tenant-usage-for-all-tenants
+        """
         url = 'os-simple-tenant-usage'
         if params:
             url += '?%s' % urllib.urlencode(params)
@@ -34,6 +40,12 @@
         return rest_client.ResponseBody(resp, body)
 
     def show_tenant_usage(self, tenant_id, **params):
+        """Show Usage Details For Tenant.
+
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/compute/#show-usage-details-for-tenant
+        """
         url = 'os-simple-tenant-usage/%s' % tenant_id
         if params:
             url += '?%s' % urllib.urlencode(params)
diff --git a/tempest/lib/services/volume/v1/backups_client.py b/tempest/lib/services/volume/v1/backups_client.py
index 2728c67..8677913 100644
--- a/tempest/lib/services/volume/v1/backups_client.py
+++ b/tempest/lib/services/volume/v1/backups_client.py
@@ -26,8 +26,9 @@
     def create_backup(self, **kwargs):
         """Creates a backup of volume.
 
-        Available params: see http://developer.openstack.org/
-                              api-ref-blockstorage-v2.html#createBackup
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/block-storage/v2/#create-backup
         """
         post_body = json.dumps({'backup': kwargs})
         resp, body = self.post('backups', post_body)
@@ -38,8 +39,9 @@
     def restore_backup(self, backup_id, **kwargs):
         """Restore volume from backup.
 
-        Available params: see http://developer.openstack.org/
-                              api-ref-blockstorage-v2.html#restoreBackup
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/block-storage/v2/#restore-backup
         """
         post_body = json.dumps({'restore': kwargs})
         resp, body = self.post('backups/%s/restore' % (backup_id), post_body)
diff --git a/tempest/lib/services/volume/v1/qos_client.py b/tempest/lib/services/volume/v1/qos_client.py
index 65ae274..e247b7b 100644
--- a/tempest/lib/services/volume/v1/qos_client.py
+++ b/tempest/lib/services/volume/v1/qos_client.py
@@ -41,8 +41,9 @@
     def create_qos(self, **kwargs):
         """Create a QoS Specification.
 
-        Available params: see http://developer.openstack.org/
-                              api-ref-blockstorage-v2.html#createQoSSpec
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/block-storage/v2/#create-qos-specification
         """
         post_body = json.dumps({'qos_specs': kwargs})
         resp, body = self.post('qos-specs', post_body)
@@ -76,8 +77,9 @@
     def set_qos_key(self, qos_id, **kwargs):
         """Set the specified keys/values of QoS specification.
 
-        Available params: see http://developer.openstack.org/
-                              api-ref-blockstorage-v2.html#setQoSKey
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/block-storage/v2/#set-keys-in-qos-specification
         """
         put_body = json.dumps({"qos_specs": kwargs})
         resp, body = self.put('qos-specs/%s' % qos_id, put_body)
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 2c4be97..8b86267 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -141,6 +141,9 @@
         if clients is None:
             clients = self.manager
 
+        if name is None:
+            name = data_utils.rand_name(self.__class__.__name__ + "-server")
+
         vnic_type = CONF.network.port_vnic_type
 
         # If vnic_type is configured create port for
@@ -408,7 +411,7 @@
                 LOG.debug('Console output for %s\nbody=\n%s',
                           server['id'], console_output)
             except lib_exc.NotFound:
-                LOG.debug("Server %s disappeared(deleted) while looking"
+                LOG.debug("Server %s disappeared(deleted) while looking "
                           "for the console log", server['id'])
 
     def _log_net_info(self, exc):
@@ -1018,7 +1021,7 @@
             if sg['tenant_id'] == tenant_id and sg['name'] == 'default'
         ]
         msg = "No default security group for tenant %s." % (tenant_id)
-        self.assertTrue(len(sgs) > 0, msg)
+        self.assertGreater(len(sgs), 0, msg)
         return sgs[0]
 
     def _create_security_group_rule(self, secgroup=None,
diff --git a/tempest/scenario/test_network_advanced_server_ops.py b/tempest/scenario/test_network_advanced_server_ops.py
index 60b030d..0605902 100644
--- a/tempest/scenario/test_network_advanced_server_ops.py
+++ b/tempest/scenario/test_network_advanced_server_ops.py
@@ -35,6 +35,12 @@
     """
 
     @classmethod
+    def setup_clients(cls):
+        super(TestNetworkAdvancedServerOps, cls).setup_clients()
+        cls.admin_servers_client = cls.os_adm.servers_client
+        cls.admin_hosts_client = cls.os_adm.hosts_client
+
+    @classmethod
     def skip_checks(cls):
         super(TestNetworkAdvancedServerOps, cls).skip_checks()
         if not (CONF.network.project_networks_reachable
@@ -94,6 +100,10 @@
                                        'ACTIVE')
         self._check_network_connectivity(server, keypair, floating_ip)
 
+    def _get_host_for_server(self, server_id):
+        body = self.admin_servers_client.show_server(server_id)['server']
+        return body['OS-EXT-SRV-ATTR:host']
+
     @test.idempotent_id('61f1aa9a-1573-410e-9054-afa557cab021')
     @test.services('compute', 'network')
     def test_server_connectivity_stop_start(self):
@@ -184,3 +194,29 @@
         self.servers_client.confirm_resize_server(server['id'])
         self._wait_server_status_and_check_network_connectivity(
             server, keypair, floating_ip)
+
+    @test.idempotent_id('a4858f6c-401e-4155-9a49-d5cd053d1a2f')
+    @testtools.skipUnless(CONF.compute_feature_enabled.cold_migration,
+                          'Cold migration is not available.')
+    @test.services('compute', 'network')
+    def test_server_connectivity_cold_migration(self):
+        if CONF.compute.min_compute_nodes < 2:
+            msg = "Less than 2 compute nodes, skipping multinode tests."
+            raise self.skipException(msg)
+
+        keypair = self.create_keypair()
+        server = self._setup_server(keypair)
+        floating_ip = self._setup_network(server, keypair)
+        src_host = self._get_host_for_server(server['id'])
+        self._wait_server_status_and_check_network_connectivity(
+            server, keypair, floating_ip)
+
+        self.admin_servers_client.migrate_server(server['id'])
+        waiters.wait_for_server_status(self.servers_client, server['id'],
+                                       'VERIFY_RESIZE')
+        self.servers_client.confirm_resize_server(server['id'])
+        self._wait_server_status_and_check_network_connectivity(
+            server, keypair, floating_ip)
+        dst_host = self._get_host_for_server(server['id'])
+
+        self.assertNotEqual(src_host, dst_host)
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index e177cb0..af313a5 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -19,7 +19,6 @@
 from oslo_log import log as logging
 import testtools
 
-from tempest.common.utils import data_utils
 from tempest.common import waiters
 from tempest import config
 from tempest.lib.common.utils import test_utils
@@ -116,8 +115,7 @@
             self.port_id = self._create_port(self.network['id'])['id']
             self.ports.append({'port': self.port_id})
 
-        name = data_utils.rand_name('server-smoke')
-        server = self._create_server(name, self.network, self.port_id)
+        server = self._create_server(self.network, self.port_id)
         self._check_tenant_network_connectivity()
 
         floating_ip = self.create_floating_ip(server)
@@ -151,7 +149,7 @@
             self.assertIn(self.router['id'],
                           seen_router_ids)
 
-    def _create_server(self, name, network, port_id=None):
+    def _create_server(self, network, port_id=None):
         keypair = self.create_keypair()
         self.keypairs[keypair['name']] = keypair
         security_groups = [{'name': self.security_group['name']}]
@@ -160,7 +158,6 @@
             network['port'] = port_id
 
         server = self.create_server(
-            name=name,
             networks=[network],
             key_name=keypair['name'],
             security_groups=security_groups,
@@ -220,9 +217,8 @@
 
     def _reassociate_floating_ips(self):
         floating_ip, server = self.floating_ip_tuple
-        name = data_utils.rand_name('new_server-smoke')
         # create a new server for the floating ip
-        server = self._create_server(name, self.network)
+        server = self._create_server(self.network)
         self._associate_floating_ip(floating_ip, server)
         self.floating_ip_tuple = Floating_IP_tuple(
             floating_ip, server)
@@ -459,8 +455,7 @@
         self._check_network_internal_connectivity(network=self.network)
         self._check_network_external_connectivity()
         self._create_new_network(create_gateway=True)
-        name = data_utils.rand_name('server-smoke')
-        self._create_server(name, self.new_net)
+        self._create_server(self.new_net)
         self._check_network_internal_connectivity(network=self.new_net,
                                                   should_connect=False)
         router_id = self.router['id']
@@ -688,8 +683,7 @@
 
         # Boot another server with the same port to make sure nothing was
         # left around that could cause issues.
-        name = data_utils.rand_name('reuse-port')
-        server = self._create_server(name, self.network, port['id'])
+        server = self._create_server(self.network, port['id'])
         port_list = self._list_ports(device_id=server['id'],
                                      network_id=self.network['id'])
         self.assertEqual(1, len(port_list),
@@ -813,8 +807,7 @@
         ssh_client = self.get_remote_client(fip['floating_ip_address'],
                                             private_key=private_key)
         spoof_nic = ssh_client.get_nic_name_by_mac(spoof_port["mac_address"])
-        name = data_utils.rand_name('peer')
-        peer = self._create_server(name, self.new_net)
+        peer = self._create_server(self.new_net)
         peer_address = peer['addresses'][self.new_net['name']][0]['addr']
         self._check_remote_connectivity(ssh_client, dest=peer_address,
                                         nic=spoof_nic, should_succeed=True)
diff --git a/tempest/test.py b/tempest/test.py
index b75ae48..93fbed3 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -610,10 +610,10 @@
             cred_provider, networks_client, CONF.compute.fixed_network_name)
 
     def assertEmpty(self, list, msg=None):
-        self.assertTrue(len(list) == 0, msg)
+        self.assertEqual(0, len(list), msg)
 
     def assertNotEmpty(self, list, msg=None):
-        self.assertTrue(len(list) > 0, msg)
+        self.assertGreater(len(list), 0, msg)
 
 
 call_until_true = debtcollector.moves.moved_function(
diff --git a/tempest/tests/common/test_custom_matchers.py b/tempest/tests/common/test_custom_matchers.py
index 07867fc..1053d86 100644
--- a/tempest/tests/common/test_custom_matchers.py
+++ b/tempest/tests/common/test_custom_matchers.py
@@ -25,11 +25,11 @@
         matches = self.matches_matches
         mismatches = self.matches_mismatches
         for candidate in matches:
-            self.assertEqual(None, matcher.match(candidate))
+            self.assertIsNone(matcher.match(candidate))
         for candidate in mismatches:
             mismatch = matcher.match(candidate)
-            self.assertNotEqual(None, mismatch)
-            self.assertNotEqual(None, getattr(mismatch, 'describe', None))
+            self.assertIsNotNone(mismatch)
+            self.assertIsNotNone(getattr(mismatch, 'describe', None))
 
     def test__str__(self):
         # [(expected, object to __str__)].
diff --git a/tempest/tests/common/test_waiters.py b/tempest/tests/common/test_waiters.py
index b113c04..46f9526 100644
--- a/tempest/tests/common/test_waiters.py
+++ b/tempest/tests/common/test_waiters.py
@@ -37,7 +37,7 @@
         waiters.wait_for_image_status(self.client, 'fake_image_id', 'active')
         end_time = int(time.time())
         # Ensure waiter returns before build_timeout
-        self.assertTrue((end_time - start_time) < 10)
+        self.assertLess((end_time - start_time), 10)
 
     def test_wait_for_image_status_timeout(self):
         time_mock = self.patch('time.time')
diff --git a/test-requirements.txt b/test-requirements.txt
index 9e3165c..3260915 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-hacking<0.12,>=0.11.0 # Apache-2.0
+hacking>=0.12.0,<0.13  # Apache-2.0
 # needed for doc build
 sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
 oslosphinx>=4.7.0 # Apache-2.0