Convert bare assert to unittest assertion

Author: Ryan P Kilby

tests/test_backends.py

@@ -60,15 +60,15 @@ class SimpleViewSet(views.FilterFieldsUserViewSet):
         </form>
         """)
 
-    def test_request_obj_is_passed(self):
+    def test_request_obj_is_passed(test):
         """
         Ensure that the request object is passed from the backend to the filterset.
         See: https://github.com/philipn/django-rest-framework-filters/issues/149
         """
         class RequestCheck(FilterSet):
             def __init__(self, *args, **kwargs):
                 super(RequestCheck, self).__init__(*args, **kwargs)
-                assert self.request is not None
+                test.assertIsNotNone(self.request)
 
             class Meta:
                 model = models.User