diff --git a/tempest/api/baremetal/admin/test_nodes.py b/tempest/api/baremetal/admin/test_nodes.py
index 8cc4d05..2c44665 100644
--- a/tempest/api/baremetal/admin/test_nodes.py
+++ b/tempest/api/baremetal/admin/test_nodes.py
@@ -138,14 +138,14 @@
         body = self.client.get_node_boot_device(self.node['uuid'])
         self.assertIn('boot_device', body)
         self.assertIn('persistent', body)
-        self.assertTrue(isinstance(body['boot_device'], six.string_types))
-        self.assertTrue(isinstance(body['persistent'], bool))
+        self.assertIsInstance(body['boot_device'], six.string_types)
+        self.assertIsInstance(body['persistent'], bool)
 
     @test.idempotent_id('3622bc6f-3589-4bc2-89f3-50419c66b133')
     def test_get_node_supported_boot_devices(self):
         body = self.client.get_node_supported_boot_devices(self.node['uuid'])
         self.assertIn('supported_boot_devices', body)
-        self.assertTrue(isinstance(body['supported_boot_devices'], list))
+        self.assertIsInstance(body['supported_boot_devices'], list)
 
     @test.idempotent_id('f63b6288-1137-4426-8cfe-0d5b7eb87c06')
     def test_get_console(self):
diff --git a/tempest/tests/common/test_dynamic_creds.py b/tempest/tests/common/test_dynamic_creds.py
index 5ef1eb3..a49612d 100644
--- a/tempest/tests/common/test_dynamic_creds.py
+++ b/tempest/tests/common/test_dynamic_creds.py
@@ -58,8 +58,8 @@
 
     def test_tempest_client(self):
         creds = dynamic_creds.DynamicCredentialProvider(**self.fixed_params)
-        self.assertTrue(isinstance(creds.identity_admin_client,
-                                   json_iden_client.IdentityClient))
+        self.assertIsInstance(creds.identity_admin_client,
+                              json_iden_client.IdentityClient)
 
     def _get_fake_admin_creds(self):
         return credentials.get_credentials(
diff --git a/tempest/tests/common/test_preprov_creds.py b/tempest/tests/common/test_preprov_creds.py
index 7188e5f..7af8654 100644
--- a/tempest/tests/common/test_preprov_creds.py
+++ b/tempest/tests/common/test_preprov_creds.py
@@ -325,7 +325,7 @@
                                                     'id': 'fake-id',
                                                     'label': 'network-2'}]}):
             creds = test_accounts_class.get_creds_by_roles(['role-7'])
-        self.assertTrue(isinstance(creds, cred_provider.TestResources))
+        self.assertIsInstance(creds, cred_provider.TestResources)
         network = creds.network
         self.assertIsNotNone(network)
         self.assertIn('name', network)
diff --git a/tempest/tests/test_glance_http.py b/tempest/tests/test_glance_http.py
index 1811141..f6076ca 100644
--- a/tempest/tests/test_glance_http.py
+++ b/tempest/tests/test_glance_http.py
@@ -93,29 +93,29 @@
         self.assertEqual(httplib.HTTPConnection, conn_class)
 
     def test_get_connection_http(self):
-        self.assertTrue(isinstance(self.client._get_connection(),
-                                   httplib.HTTPConnection))
+        self.assertIsInstance(self.client._get_connection(),
+                              httplib.HTTPConnection)
 
     def test_get_connection_https(self):
         endpoint = 'https://fake_url.com'
         self.fake_auth.base_url = mock.MagicMock(return_value=endpoint)
         self.client = glance_http.HTTPClient(self.fake_auth, {})
-        self.assertTrue(isinstance(self.client._get_connection(),
-                                   glance_http.VerifiedHTTPSConnection))
+        self.assertIsInstance(self.client._get_connection(),
+                              glance_http.VerifiedHTTPSConnection)
 
     def test_get_connection_ipv4_https(self):
         endpoint = 'https://127.0.0.1'
         self.fake_auth.base_url = mock.MagicMock(return_value=endpoint)
         self.client = glance_http.HTTPClient(self.fake_auth, {})
-        self.assertTrue(isinstance(self.client._get_connection(),
-                                   glance_http.VerifiedHTTPSConnection))
+        self.assertIsInstance(self.client._get_connection(),
+                              glance_http.VerifiedHTTPSConnection)
 
     def test_get_connection_ipv6_https(self):
         endpoint = 'https://[::1]'
         self.fake_auth.base_url = mock.MagicMock(return_value=endpoint)
         self.client = glance_http.HTTPClient(self.fake_auth, {})
-        self.assertTrue(isinstance(self.client._get_connection(),
-                                   glance_http.VerifiedHTTPSConnection))
+        self.assertIsInstance(self.client._get_connection(),
+                              glance_http.VerifiedHTTPSConnection)
 
     def test_get_connection_url_not_fount(self):
         self.useFixture(mockpatch.PatchObject(self.client, 'connection_class',