Improve the `get_queryset` overriding test readability.

tests/test_relations.py

@@ -177,9 +177,11 @@ class TestSlugRelatedField(APISimpleTestCase):
         assert representation == self.instance.name
 
     def test_no_queryset_init(self):
+        qs = self.queryset
+
         class NoQuerySetSlugRelatedField(serializers.SlugRelatedField):
-            def get_queryset(this):
-                return self.queryset
+            def get_queryset(self):
+                return qs
 
         field = NoQuerySetSlugRelatedField(slug_field='name')
         field.to_internal_value(self.instance.name)