diff --git a/glanceclient/tests/unit/v1/test_images.py b/glanceclient/tests/unit/v1/test_images.py
index 90849d1f..1de85ce9 100644
--- a/glanceclient/tests/unit/v1/test_images.py
+++ b/glanceclient/tests/unit/v1/test_images.py
@@ -554,7 +554,7 @@ class ImageManagerTest(testtools.TestCase):
         except IOError as e:
             self.assertEqual(errno.EPIPE, e.errno)
             msg = 'was fd7c5c4fdaa97163ee4ba8842baa537a expected wrong'
-            self.assertTrue(msg in str(e))
+            self.assertIn(msg, str(e))
 
     def test_data_req_id(self):
         params = {
@@ -897,7 +897,7 @@ class ImageTest(testtools.TestCase):
         except IOError as e:
             self.assertEqual(errno.EPIPE, e.errno)
             msg = 'was fd7c5c4fdaa97163ee4ba8842baa537a expected wrong'
-            self.assertTrue(msg in str(e))
+            self.assertIn(msg, str(e))
 
     def test_data_with_checksum(self):
         image = self.mgr.get('3')
@@ -959,5 +959,5 @@ class UrlParameterTest(testtools.TestCase):
         shell.do_image_list(self.gc, FakeArg({"is_public": "True"}))
         parts = parse.urlparse(self.api.url)
         qs_dict = parse.parse_qs(parts.query)
-        self.assertTrue('is_public' in qs_dict)
+        self.assertIn('is_public', qs_dict)
         self.assertTrue(qs_dict['is_public'][0].lower() == "true")
diff --git a/glanceclient/tests/unit/v1/test_shell.py b/glanceclient/tests/unit/v1/test_shell.py
index 342dce14..4c74ca0d 100644
--- a/glanceclient/tests/unit/v1/test_shell.py
+++ b/glanceclient/tests/unit/v1/test_shell.py
@@ -466,7 +466,7 @@ class ShellStdinHandlingTests(testtools.TestCase):
 
             self._do_update('44d2c7e1-de4e-4612-8aa2-ba26610c444f')
 
-            self.assertTrue('data' in self.collected_args[1])
+            self.assertIn('data', self.collected_args[1])
             self.assertIsInstance(self.collected_args[1]['data'], file_type)
             self.assertEqual('Some Data',
                              self.collected_args[1]['data'].read())
@@ -491,7 +491,7 @@ class ShellStdinHandlingTests(testtools.TestCase):
 
             self._do_update('44d2c7e1-de4e-4612-8aa2-ba26610c444f')
 
-            self.assertTrue('data' in self.collected_args[1])
+            self.assertIn('data', self.collected_args[1])
             self.assertIsInstance(self.collected_args[1]['data'], file_type)
             self.assertEqual('Some Data\n',
                              self.collected_args[1]['data'].read())
diff --git a/glanceclient/tests/unit/v2/test_images.py b/glanceclient/tests/unit/v2/test_images.py
index 7fc7558e..26ee792f 100644
--- a/glanceclient/tests/unit/v2/test_images.py
+++ b/glanceclient/tests/unit/v2/test_images.py
@@ -826,7 +826,7 @@ class TestController(testtools.TestCase):
         except IOError as e:
             self.assertEqual(errno.EPIPE, e.errno)
             msg = 'was 9d3d9048db16a7eee539e93e3618cbe7 expected wrong'
-            self.assertTrue(msg in str(e))
+            self.assertIn(msg, str(e))
 
     def test_data_with_checksum(self):
         body = self.controller.data('1b1c6366-dd57-11e1-af0f-02163e68b1d8',
@@ -989,17 +989,17 @@ class TestController(testtools.TestCase):
         e = self.assertRaises(exc.HTTPBadRequest,
                               self.controller.add_location,
                               image_id, url, meta)
-        self.assertTrue(estr in str(e))
+        self.assertIn(estr, str(e))
 
         e = self.assertRaises(exc.HTTPBadRequest,
                               self.controller.delete_locations,
                               image_id, set([url]))
-        self.assertTrue(estr in str(e))
+        self.assertIn(estr, str(e))
 
         e = self.assertRaises(exc.HTTPBadRequest,
                               self.controller.update_location,
                               image_id, url, meta)
-        self.assertTrue(estr in str(e))
+        self.assertIn(estr, str(e))
 
     def _empty_get(self, image_id):
         return ('GET', '/v2/images/%s' % image_id, {}, None)
@@ -1052,7 +1052,7 @@ class TestController(testtools.TestCase):
         err = self.assertRaises(exc.HTTPNotFound,
                                 self.controller.delete_locations,
                                 image_id, url_set)
-        self.assertTrue(err_str in str(err))
+        self.assertIn(err_str, str(err))
 
     def test_update_location(self):
         image_id = 'a2b83adc-888e-11e3-8872-78acc0b951d8'
@@ -1095,4 +1095,4 @@ class TestController(testtools.TestCase):
         err = self.assertRaises(exc.HTTPNotFound,
                                 self.controller.update_location,
                                 image_id, **new_loc)
-        self.assertTrue(err_str in str(err))
+        self.assertIn(err_str, str(err))