diff --git a/graphene/core/types/tests/test_custom_scalars.py b/graphene/core/types/tests/test_custom_scalars.py
index 4f252bcf..31cb7855 100644
--- a/graphene/core/types/tests/test_custom_scalars.py
+++ b/graphene/core/types/tests/test_custom_scalars.py
@@ -30,10 +30,10 @@ def test_json_string():
     test_json_string = '{"foo": "bar"}'
 
     test_object = JSONString().parse_value(test_json_string)
-    assert test_object == { 'foo': 'bar' }
+    assert test_object == {'foo': 'bar'}
 
     assert JSONString.serialize(test_object) == test_json_string
 
     node = StringValue(test_json_string)
     test_object = JSONString.parse_literal(node)
-    assert test_object == { 'foo': 'bar' }
+    assert test_object == {'foo': 'bar'}