diff --git a/tests/contrib/test_flask_util.py b/tests/contrib/test_flask_util.py
index b80e08c..d542036 100644
--- a/tests/contrib/test_flask_util.py
+++ b/tests/contrib/test_flask_util.py
@@ -229,8 +229,8 @@ class FlaskOAuth2Tests(unittest2.TestCase):
             with mock.patch(
                     'oauth2client.transport.get_http_object') as new_http:
                 # Set-up mock.
-                new_http.return_value = http = http_mock.HttpMock(
-                    data=DEFAULT_RESP)
+                http = http_mock.HttpMock(data=DEFAULT_RESP)
+                new_http.return_value = http
                 # Run tests.
                 state = self._setup_callback_state(client)
 
diff --git a/tests/contrib/test_metadata.py b/tests/contrib/test_metadata.py
index a8544e3..5af4ab9 100644
--- a/tests/contrib/test_metadata.py
+++ b/tests/contrib/test_metadata.py
@@ -32,9 +32,9 @@ EXPECTED_KWARGS = dict(headers=_metadata.METADATA_HEADERS)
 
 
 def request_mock(status, content_type, content):
-    resp = http_mock.ResponseMock(
+    response = http_mock.ResponseMock(
         {'status': status, 'content-type': content_type})
-    return mock.Mock(return_value=(resp, content.encode('utf-8')))
+    return mock.Mock(return_value=(response, content.encode('utf-8')))
 
 
 class TestMetadata(unittest2.TestCase):
diff --git a/tests/http_mock.py b/tests/http_mock.py
index 34dc5e5..70d0e97 100644
--- a/tests/http_mock.py
+++ b/tests/http_mock.py
@@ -15,6 +15,9 @@
 """HTTP helpers mock functionality."""
 
 
+from six.moves import http_client
+
+
 class ResponseMock(dict):
     """Mock HTTP response"""
 
@@ -22,7 +25,7 @@ class ResponseMock(dict):
         if vals is None:
             vals = {}
         self.update(vals)
-        self.status = int(self.get('status', 200))
+        self.status = int(self.get('status', http_client.OK))
 
 
 class HttpMock(object):
@@ -35,7 +38,7 @@ class HttpMock(object):
             headers: dict, header to return with response
         """
         if headers is None:
-            headers = {'status': '200'}
+            headers = {'status': http_client.OK}
         self.data = data
         self.response_headers = headers
         self.headers = None
diff --git a/tests/test_client.py b/tests/test_client.py
index 64a7d7b..be5994f 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -908,7 +908,7 @@ class BasicCredentialsTests(unittest2.TestCase):
             self.assertEqual(token_response, self.credentials.token_response)
 
     def test_recursive_authorize(self):
-        # Tests that OAuth2Credentials doesn't intro. new method constraints.
+        # Tests that OAuth2Credentials doesn't introduce new method constraints.
         # Formerly, OAuth2Credentials.authorize monkeypatched the request method
         # of the passed in HTTP object with a wrapper annotated with
         # @util.positional(1). Since the original method has no such annotation,