diff --git a/graphene/core/types/tests/test_custom_scalars.py b/graphene/core/types/tests/test_custom_scalars.py
index ee09447d..b16c00f5 100644
--- a/graphene/core/types/tests/test_custom_scalars.py
+++ b/graphene/core/types/tests/test_custom_scalars.py
@@ -8,7 +8,6 @@ from ..custom_scalars import DateTime
 def test_date_time():
     test_iso_string = "2016-04-29T18:34:12.502Z"
 
-
     def check_datetime(test_dt):
         assert test_dt.tzinfo == iso8601.UTC
         assert test_dt.year == 2016