diff --git a/tempest/api/identity/admin/v2/test_users.py b/tempest/api/identity/admin/v2/test_users.py
index 8e63498..4a4b51a 100644
--- a/tempest/api/identity/admin/v2/test_users.py
+++ b/tempest/api/identity/admin/v2/test_users.py
@@ -234,4 +234,4 @@
         # Validate the updated password through getting a token.
         body = self.token_client.auth(user['name'], new_pass,
                                       tenant['name'])
-        self.assertTrue('id' in body['token'])
+        self.assertIn('id', body['token'])
diff --git a/tempest/api/orchestration/stacks/test_nova_keypair_resources.py b/tempest/api/orchestration/stacks/test_nova_keypair_resources.py
index 0400e76..8d12e75 100644
--- a/tempest/api/orchestration/stacks/test_nova_keypair_resources.py
+++ b/tempest/api/orchestration/stacks/test_nova_keypair_resources.py
@@ -72,10 +72,10 @@
         for outputs in stack['outputs']:
             output_map[outputs['output_key']] = outputs['output_value']
         # Test that first key generated public and private keys
-        self.assertTrue('KeyPair_PublicKey' in output_map)
-        self.assertTrue("Generated" in output_map['KeyPair_PublicKey'])
-        self.assertTrue('KeyPair_PrivateKey' in output_map)
-        self.assertTrue('-----BEGIN' in output_map['KeyPair_PrivateKey'])
+        self.assertIn('KeyPair_PublicKey', output_map)
+        self.assertIn("Generated", output_map['KeyPair_PublicKey'])
+        self.assertIn('KeyPair_PrivateKey', output_map)
+        self.assertIn('-----BEGIN', output_map['KeyPair_PrivateKey'])
         # Test that second key generated public key, and private key is not
         # in the output due to save_private_key = false
         self.assertTrue('KeyPairDontSavePrivate_PublicKey' in output_map)
diff --git a/tempest/tests/negative/test_negative_generators.py b/tempest/tests/negative/test_negative_generators.py
index 2e45ef7..7e1ee2c 100644
--- a/tempest/tests/negative/test_negative_generators.py
+++ b/tempest/tests/negative/test_negative_generators.py
@@ -107,7 +107,7 @@
 
     def _validate_result(self, valid_schema, invalid_schema):
         for k, v in six.iteritems(valid_schema):
-            self.assertTrue(k in invalid_schema)
+            self.assertIn(k, invalid_schema)
 
     def test_generator_mandatory_functions(self):
         for data_type in self.types: