diff --git a/tests/queryset/test_queryset.py b/tests/queryset/test_queryset.py
index 1a15a114..5add0750 100644
--- a/tests/queryset/test_queryset.py
+++ b/tests/queryset/test_queryset.py
@@ -872,17 +872,15 @@ class TestQueryset(unittest.TestCase):
         self.Person.objects.create(name="Foo", age=11)
 
         bob = self.Person.objects.as_pymongo().first()
-        assert 'age' in bob
-        assert bob['age'] == 11
+        assert "age" in bob
+        assert bob["age"] == 11
 
-        self.Person.objects(name="Foo").update(
-            rename__age='person_age'
-        )
+        self.Person.objects(name="Foo").update(rename__age="person_age")
 
         bob = self.Person.objects.as_pymongo().first()
-        assert 'age' not in bob
-        assert 'person_age' in bob
-        assert bob['person_age'] == 11
+        assert "age" not in bob
+        assert "person_age" in bob
+        assert bob["person_age"] == 11
 
     def test_save_and_only_on_fields_with_default(self):
         class Embed(EmbeddedDocument):