diff --git a/tests/oauth2/test_credentials.py b/tests/oauth2/test_credentials.py
index 6d72012cf..7d2a9b872 100644
--- a/tests/oauth2/test_credentials.py
+++ b/tests/oauth2/test_credentials.py
@@ -290,9 +290,7 @@ def test_refresh_with_refresh_token_and_refresh_handler(
         refresh_handler.assert_not_called()
 
     @mock.patch("google.auth._helpers.utcnow", return_value=datetime.datetime.min)
-    def test_refresh_with_refresh_handler_success_scopes(
-        self, unused_utcnow
-    ):
+    def test_refresh_with_refresh_handler_success_scopes(self, unused_utcnow):
         expected_expiry = datetime.datetime.min + datetime.timedelta(seconds=2800)
         refresh_handler = mock.Mock(return_value=("ACCESS_TOKEN", expected_expiry))
         scopes = ["email", "profile"]
@@ -320,9 +318,7 @@ def test_refresh_with_refresh_handler_success_scopes(
         refresh_handler.assert_called_with(request, scopes=scopes)
 
     @mock.patch("google.auth._helpers.utcnow", return_value=datetime.datetime.min)
-    def test_refresh_with_refresh_handler_success_default_scopes(
-        self, unused_utcnow
-    ):
+    def test_refresh_with_refresh_handler_success_default_scopes(self, unused_utcnow):
         expected_expiry = datetime.datetime.min + datetime.timedelta(seconds=2800)
         original_refresh_handler = mock.Mock(
             return_value=("UNUSED_TOKEN", expected_expiry)