diff --git a/tempest/api/volume/admin/test_groups.py b/tempest/api/volume/admin/test_groups.py
index 2f6eb6b..e67b985 100644
--- a/tempest/api/volume/admin/test_groups.py
+++ b/tempest/api/volume/admin/test_groups.py
@@ -23,12 +23,15 @@
 
 
 class GroupsTest(base.BaseVolumeAdminTest):
+    """Tests of volume groups with microversion greater than 3.12"""
+
     _api_version = 3
     min_microversion = '3.13'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('4b111d28-b73d-4908-9bd2-03dc2992e4d4')
     def test_group_create_show_list_delete(self):
+        """Test creating, showing, listing and deleting of volume group"""
         # Create volume type
         volume_type = self.create_volume_type()
 
@@ -95,6 +98,7 @@
 
     @decorators.idempotent_id('4a8a6fd2-8b3b-4641-8f54-6a6f99320006')
     def test_group_update(self):
+        """Test updating volume group"""
         # Create volume type
         volume_type = self.create_volume_type()
 
@@ -150,12 +154,15 @@
 
 
 class GroupsV314Test(base.BaseVolumeAdminTest):
+    """Tests of volume groups with microversion greater than 3.13"""
+
     _api_version = 3
     min_microversion = '3.14'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('2424af8c-7851-4888-986a-794b10c3210e')
     def test_create_group_from_group(self):
+        """Test creating volume group from volume group"""
         # Create volume type
         volume_type = self.create_volume_type()
 
@@ -185,12 +192,15 @@
 
 
 class GroupsV320Test(base.BaseVolumeAdminTest):
+    """Tests of volume groups with microversion greater than 3.19"""
+
     _api_version = 3
     min_microversion = '3.20'
     max_microversion = 'latest'
 
     @decorators.idempotent_id('b20c696b-0cbc-49a5-8b3a-b1fb9338f45c')
     def test_reset_group_status(self):
+        """Test resetting volume group status to creating/available/error"""
         # Create volume type
         volume_type = self.create_volume_type()
 
diff --git a/tempest/api/volume/admin/test_snapshot_manage.py b/tempest/api/volume/admin/test_snapshot_manage.py
index 37a47ec..ab0aa38 100644
--- a/tempest/api/volume/admin/test_snapshot_manage.py
+++ b/tempest/api/volume/admin/test_snapshot_manage.py
@@ -48,6 +48,7 @@
 
     @decorators.idempotent_id('0132f42d-0147-4b45-8501-cc504bbf7810')
     def test_unmanage_manage_snapshot(self):
+        """Test unmanaging and managing volume snapshot"""
         # Create a volume
         volume = self.create_volume()
 
diff --git a/tempest/api/volume/admin/test_user_messages.py b/tempest/api/volume/admin/test_user_messages.py
index 8048017..096709c 100644
--- a/tempest/api/volume/admin/test_user_messages.py
+++ b/tempest/api/volume/admin/test_user_messages.py
@@ -22,6 +22,8 @@
 
 
 class UserMessagesTest(base.BaseVolumeAdminTest):
+    """Test volume messages with microversion greater than 3.2"""
+
     _api_version = 3
     min_microversion = '3.3'
     max_microversion = 'latest'
@@ -51,6 +53,7 @@
 
     @decorators.idempotent_id('50f29e6e-f363-42e1-8ad1-f67ae7fd4d5a')
     def test_list_show_messages(self):
+        """Test listing and showing volume messages"""
         message_id = self._create_user_message()
         self.addCleanup(self.messages_client.delete_message, message_id)
 
@@ -62,6 +65,7 @@
 
     @decorators.idempotent_id('c6eb6901-cdcc-490f-b735-4fe251842aed')
     def test_delete_message(self):
+        """Test deleting volume messages"""
         message_id = self._create_user_message()
         self.messages_client.delete_message(message_id)
         self.messages_client.wait_for_resource_deletion(message_id)
diff --git a/tempest/api/volume/admin/test_volume_hosts.py b/tempest/api/volume/admin/test_volume_hosts.py
index 83c27e1..e4e15c5 100644
--- a/tempest/api/volume/admin/test_volume_hosts.py
+++ b/tempest/api/volume/admin/test_volume_hosts.py
@@ -18,9 +18,11 @@
 
 
 class VolumeHostsAdminTestsJSON(base.BaseVolumeAdminTest):
+    """Test fetching volume hosts info by admin users"""
 
     @decorators.idempotent_id('d5f3efa2-6684-4190-9ced-1c2f526352ad')
     def test_list_hosts(self):
+        """Test listing volume hosts"""
         hosts = self.admin_hosts_client.list_hosts()['hosts']
         self.assertGreaterEqual(len(hosts), 2,
                                 "The count of volume hosts is < 2, "
@@ -28,6 +30,7 @@
 
     @decorators.idempotent_id('21168d57-b373-4b71-a3ac-f2c88f0c5d31')
     def test_show_host(self):
+        """Test getting volume host details"""
         hosts = self.admin_hosts_client.list_hosts()['hosts']
         self.assertGreaterEqual(len(hosts), 2,
                                 "The count of volume hosts is < 2, "
diff --git a/tempest/api/volume/admin/test_volume_manage.py b/tempest/api/volume/admin/test_volume_manage.py
index 4b352e0..1e4e7cb 100644
--- a/tempest/api/volume/admin/test_volume_manage.py
+++ b/tempest/api/volume/admin/test_volume_manage.py
@@ -24,6 +24,7 @@
 
 
 class VolumeManageAdminTest(base.BaseVolumeAdminTest):
+    """Test volume manage by admin users"""
 
     @classmethod
     def skip_checks(cls):
@@ -39,6 +40,7 @@
 
     @decorators.idempotent_id('70076c71-0ce1-4208-a8ff-36a66e65cc1e')
     def test_unmanage_manage_volume(self):
+        """Test unmanaging and managing volume"""
         # Create original volume
         org_vol_id = self.create_volume()['id']
         org_vol_info = self.admin_volume_client.show_volume(
diff --git a/tempest/api/volume/admin/test_volume_pools.py b/tempest/api/volume/admin/test_volume_pools.py
index 744bc01..9424994 100644
--- a/tempest/api/volume/admin/test_volume_pools.py
+++ b/tempest/api/volume/admin/test_volume_pools.py
@@ -21,6 +21,8 @@
 
 
 class VolumePoolsAdminTestsJSON(base.BaseVolumeAdminTest):
+    """Test getting volume pools by admin users"""
+
     def _assert_pools(self, with_detail=False):
         cinder_pools = self.admin_scheduler_stats_client.list_pools(
             detail=with_detail)['pools']
@@ -33,8 +35,10 @@
 
     @decorators.idempotent_id('0248a46c-e226-4933-be10-ad6fca8227e7')
     def test_get_pools_without_details(self):
+        """Test getting volume pools without detail"""
         self._assert_pools()
 
     @decorators.idempotent_id('d4bb61f7-762d-4437-b8a4-5785759a0ced')
     def test_get_pools_with_details(self):
+        """Test getting volume pools with detail"""
         self._assert_pools(with_detail=True)
diff --git a/tempest/api/volume/admin/test_volume_quotas_negative.py b/tempest/api/volume/admin/test_volume_quotas_negative.py
index 5c7ab15..937d28b 100644
--- a/tempest/api/volume/admin/test_volume_quotas_negative.py
+++ b/tempest/api/volume/admin/test_volume_quotas_negative.py
@@ -24,6 +24,7 @@
 
 
 class VolumeQuotasNegativeTestJSON(base.BaseVolumeAdminTest):
+    """Negative tests of volume quotas"""
 
     @classmethod
     def setup_credentials(cls):
@@ -52,6 +53,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('bf544854-d62a-47f2-a681-90f7a47d86b6')
     def test_quota_volumes(self):
+        """Creating more volume than allowed quota will fail"""
         self.admin_quotas_client.update_quota_set(self.demo_tenant_id,
                                                   volumes=1, gigabytes=-1)
         self.assertRaises(lib_exc.OverLimit,
@@ -61,6 +63,7 @@
     @decorators.attr(type='negative')
     @decorators.idempotent_id('2dc27eee-8659-4298-b900-169d71a91374')
     def test_quota_volume_gigabytes(self):
+        """Creating volume with size larger than allowed quota will fail"""
         self.admin_quotas_client.update_quota_set(
             self.demo_tenant_id, gigabytes=CONF.volume.volume_size, volumes=-1)
         self.assertRaises(lib_exc.OverLimit,
@@ -70,6 +73,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('d321dc21-d8c6-401f-95fe-49f4845f1a6d')
     def test_volume_extend_gigabytes_quota_deviation(self):
+        """Extending volume with size larger than allowed quota will fail"""
         self.admin_quotas_client.update_quota_set(
             self.demo_tenant_id, gigabytes=CONF.volume.volume_size)
         self.assertRaises(lib_exc.OverLimit,
diff --git a/tempest/api/volume/admin/test_volume_types_negative.py b/tempest/api/volume/admin/test_volume_types_negative.py
index ae29049..174cf9e 100644
--- a/tempest/api/volume/admin/test_volume_types_negative.py
+++ b/tempest/api/volume/admin/test_volume_types_negative.py
@@ -20,11 +20,12 @@
 
 
 class VolumeTypesNegativeTest(base.BaseVolumeAdminTest):
+    """Negative tests of volume type"""
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('878b4e57-faa2-4659-b0d1-ce740a06ae81')
     def test_create_with_empty_name(self):
-        # Should not be able to create volume type with an empty name.
+        """Test creating volume type with an empty name will fail"""
         self.assertRaises(
             lib_exc.BadRequest,
             self.admin_volume_types_client.create_volume_type, name='')
@@ -32,7 +33,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('994610d6-0476-4018-a644-a2602ef5d4aa')
     def test_get_nonexistent_type_id(self):
-        # Should not be able to get volume type with nonexistent type id.
+        """Test getting volume type with nonexistent type id will fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.admin_volume_types_client.show_volume_type,
                           data_utils.rand_uuid())
@@ -40,7 +41,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('6b3926d2-7d73-4896-bc3d-e42dfd11a9f6')
     def test_delete_nonexistent_type_id(self):
-        # Should not be able to delete volume type with nonexistent type id.
+        """Test deleting volume type with nonexistent type id will fail"""
         self.assertRaises(lib_exc.NotFound,
                           self.admin_volume_types_client.delete_volume_type,
                           data_utils.rand_uuid())
@@ -48,7 +49,7 @@
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('8c09f849-f225-4d78-ba87-bffd9a5e0c6f')
     def test_create_volume_with_private_volume_type(self):
-        # Should not be able to create volume with private volume type.
+        """Test creating volume with private volume type will fail"""
         params = {'os-volume-type-access:is_public': False}
         volume_type = self.create_volume_type(**params)
         self.assertRaises(lib_exc.NotFound,
diff --git a/tempest/api/volume/admin/test_volumes_actions.py b/tempest/api/volume/admin/test_volumes_actions.py
index 5bac3d8..33e503f 100644
--- a/tempest/api/volume/admin/test_volumes_actions.py
+++ b/tempest/api/volume/admin/test_volumes_actions.py
@@ -23,6 +23,8 @@
 
 
 class VolumesActionsTest(base.BaseVolumeAdminTest):
+    """Test volume actions"""
+
     create_default_network = True
 
     def _create_reset_and_force_delete_temp_volume(self, status=None):
@@ -38,7 +40,10 @@
 
     @decorators.idempotent_id('d063f96e-a2e0-4f34-8b8a-395c42de1845')
     def test_volume_reset_status(self):
-        # test volume reset status : available->error->available->maintenance
+        """Test resetting volume status
+
+        Reset volume status to available->error->available->maintenance
+        """
         volume = self.create_volume()
         self.addCleanup(waiters.wait_for_volume_resource_status,
                         self.volumes_client, volume['id'], 'available')
@@ -52,27 +57,28 @@
 
     @decorators.idempotent_id('21737d5a-92f2-46d7-b009-a0cc0ee7a570')
     def test_volume_force_delete_when_volume_is_creating(self):
-        # test force delete when status of volume is creating
+        """Test force deleting volume when its status is creating"""
         self._create_reset_and_force_delete_temp_volume('creating')
 
     @decorators.idempotent_id('db8d607a-aa2e-4beb-b51d-d4005c232011')
     def test_volume_force_delete_when_volume_is_attaching(self):
-        # test force delete when status of volume is attaching
+        """Test force deleting volume when its status is attaching"""
         self._create_reset_and_force_delete_temp_volume('attaching')
 
     @decorators.idempotent_id('3e33a8a8-afd4-4d64-a86b-c27a185c5a4a')
     def test_volume_force_delete_when_volume_is_error(self):
-        # test force delete when status of volume is error
+        """Test force deleting volume when its status is error"""
         self._create_reset_and_force_delete_temp_volume('error')
 
     @decorators.idempotent_id('b957cabd-1486-4e21-90cf-a9ed3c39dfb2')
     def test_volume_force_delete_when_volume_is_maintenance(self):
-        # test force delete when status of volume is maintenance
+        """Test force deleting volume when its status is maintenance"""
         self._create_reset_and_force_delete_temp_volume('maintenance')
 
     @decorators.idempotent_id('d38285d9-929d-478f-96a5-00e66a115b81')
     @utils.services('compute')
     def test_force_detach_volume(self):
+        """Test force detaching volume when its status is error"""
         # Create a server and a volume
         server_id = self.create_server()['id']
         volume_id = self.create_volume()['id']