diff --git a/oslo_messaging/tests/drivers/test_amqp_driver.py b/oslo_messaging/tests/drivers/test_amqp_driver.py
index d1ca36ce7..cc1202cf6 100644
--- a/oslo_messaging/tests/drivers/test_amqp_driver.py
+++ b/oslo_messaging/tests/drivers/test_amqp_driver.py
@@ -1337,10 +1337,10 @@ class TestAddressing(test_utils.BaseTestCase):
         # simply check that the correct addresser is provided based on the
         # identity of the messaging back-end
         self.config(addressing_mode='dynamic', group="oslo_messaging_amqp")
-        self.assertTrue(isinstance(self._dynamic_test("router"),
-                                   RoutableAddresser))
-        self.assertTrue(isinstance(self._dynamic_test("qpid-cpp"),
-                                   LegacyAddresser))
+        self.assertIsInstance(self._dynamic_test("router"),
+                              RoutableAddresser)
+        self.assertIsInstance(self._dynamic_test("qpid-cpp"),
+                              LegacyAddresser)
 
 
 class FakeBroker(threading.Thread):
diff --git a/oslo_messaging/tests/drivers/zmq/test_zmq_async.py b/oslo_messaging/tests/drivers/zmq/test_zmq_async.py
index 702e39b4b..5d8159deb 100644
--- a/oslo_messaging/tests/drivers/zmq/test_zmq_async.py
+++ b/oslo_messaging/tests/drivers/zmq/test_zmq_async.py
@@ -59,14 +59,14 @@ class TestGetPoller(test_utils.BaseTestCase):
 
         poller = zmq_async.get_poller()
 
-        self.assertTrue(isinstance(poller, green_poller.GreenPoller))
+        self.assertIsInstance(poller, green_poller.GreenPoller)
 
     def test_when_eventlet_is_unavailable_then_return_ThreadingPoller(self):
         zmq_async.eventletutils.is_monkey_patched = lambda _: False
 
         poller = zmq_async.get_poller()
 
-        self.assertTrue(isinstance(poller, threading_poller.ThreadingPoller))
+        self.assertIsInstance(poller, threading_poller.ThreadingPoller)
 
 
 class TestGetExecutor(test_utils.BaseTestCase):
@@ -80,7 +80,7 @@ class TestGetExecutor(test_utils.BaseTestCase):
 
         executor = zmq_async.get_executor('any method')
 
-        self.assertTrue(isinstance(executor, green_poller.GreenExecutor))
+        self.assertIsInstance(executor, green_poller.GreenExecutor)
         self.assertEqual('any method', executor._method)
 
     def test_when_eventlet_is_unavailable_then_return_ThreadingExecutor(self):
@@ -88,6 +88,6 @@ class TestGetExecutor(test_utils.BaseTestCase):
 
         executor = zmq_async.get_executor('any method')
 
-        self.assertTrue(isinstance(executor,
-                                   threading_poller.ThreadingExecutor))
+        self.assertIsInstance(executor,
+                              threading_poller.ThreadingExecutor)
         self.assertEqual('any method', executor._method)
diff --git a/oslo_messaging/tests/test_config_opts_proxy.py b/oslo_messaging/tests/test_config_opts_proxy.py
index e51794cf4..0733c5363 100644
--- a/oslo_messaging/tests/test_config_opts_proxy.py
+++ b/oslo_messaging/tests/test_config_opts_proxy.py
@@ -51,8 +51,8 @@ class TestConfigOptsProxy(test_utils.BaseTestCase):
         self.assertRaises(cfg.NoSuchOptError,
                           conf.__getattr__,
                           'unknown_group')
-        self.assertTrue(isinstance(getattr(conf, group),
-                                   conf.GroupAttrProxy))
+        self.assertIsInstance(getattr(conf, group),
+                              conf.GroupAttrProxy)
         self.assertEqual(1, conf.oslo_messaging_rabbit.rabbit_retry_interval)
         self.assertEqual(2,
                          conf.oslo_messaging_rabbit.rabbit_qos_prefetch_count)