diff --git a/graphene/core/classtypes/tests/test_objecttype.py b/graphene/core/classtypes/tests/test_objecttype.py
index ba20928d..609975f2 100644
--- a/graphene/core/classtypes/tests/test_objecttype.py
+++ b/graphene/core/classtypes/tests/test_objecttype.py
@@ -54,16 +54,18 @@ def test_object_type_set_properties():
     assert h.readonly_prop == 'readonly'
     assert h.write_prop == 'custom'
 
+
 def test_object_type_set_private_attributes():
     class Human(ObjectType):
         _private_state = None
-    
+
     h = Human(_private_state='custom')
     assert h._private_state == 'custom'
-    
+
     with raises(TypeError):
         Human(_other_private_state='My name')
 
+
 def test_object_type_container_invalid_kwarg():
     class Human(ObjectType):
         name = String()