diff --git a/cinder/tests/unit/objects/test_base.py b/cinder/tests/unit/objects/test_base.py
index 191834c33fd..993983081f3 100644
--- a/cinder/tests/unit/objects/test_base.py
+++ b/cinder/tests/unit/objects/test_base.py
@@ -698,7 +698,7 @@ class TestCinderObjectConditionalUpdate(test.TestCase):
         # is not relevant).
         self.assertEqual(1, update.call_count)
         arg = update.call_args[0][0]
-        self.assertTrue(isinstance(arg, dict))
+        self.assertIsInstance(arg, dict)
         self.assertEqual(set(values.keys()), set(arg.keys()))
 
     def test_conditional_update_multitable_fail(self):
diff --git a/cinder/tests/unit/test_ssh_utils.py b/cinder/tests/unit/test_ssh_utils.py
index 155b8934a36..88ade3b2ac8 100644
--- a/cinder/tests/unit/test_ssh_utils.py
+++ b/cinder/tests/unit/test_ssh_utils.py
@@ -302,8 +302,8 @@ class SSHPoolTestCase(test.TestCase):
                                     max_size=1)
 
         with sshpool.item() as ssh:
-            self.assertTrue(isinstance(ssh.get_policy(),
-                                       paramiko.RejectPolicy))
+            self.assertIsInstance(ssh.get_policy(),
+                                  paramiko.RejectPolicy)
 
     @mock.patch('six.moves.builtins.open')
     @mock.patch('paramiko.SSHClient')
@@ -322,5 +322,5 @@ class SSHPoolTestCase(test.TestCase):
                                     max_size=1)
 
         with sshpool.item() as ssh:
-            self.assertTrue(isinstance(ssh.get_policy(),
-                                       paramiko.AutoAddPolicy))
+            self.assertIsInstance(ssh.get_policy(),
+                                  paramiko.AutoAddPolicy)
diff --git a/cinder/tests/unit/volume/drivers/emc/vnx/test_taskflows.py b/cinder/tests/unit/volume/drivers/emc/vnx/test_taskflows.py
index 74cd18f26c6..9fa244687c3 100644
--- a/cinder/tests/unit/volume/drivers/emc/vnx/test_taskflows.py
+++ b/cinder/tests/unit/volume/drivers/emc/vnx/test_taskflows.py
@@ -165,7 +165,7 @@ class TestTaskflow(test.TestCase):
                                        store=store_spec)
         engine.run()
         snap_name = engine.storage.fetch('new_cg_snap_name')
-        self.assertTrue(isinstance(snap_name, res_mock.StorageObjectMock))
+        self.assertIsInstance(snap_name, res_mock.StorageObjectMock)
 
     @res_mock.patch_client
     def test_create_cg_snapshot_task_revert(self, client, mocked):