Reenable assertion in assert_query_equality

tests/test_utils.py

@@ -9,8 +9,7 @@ def assert_query_equality(left_query, right_query):
         if isinstance(lookup, Prefetch) and isinstance(right_lookup, Prefetch):
             assert_query_equality(lookup.queryset, right_lookup.queryset)
         elif isinstance(lookup, Prefetch):
-            # assert str(lookup.queryset.query) == right_lookup
-            pass
+            assert str(lookup.queryset.query) == right_lookup
         elif isinstance(right_lookup, Prefetch):
             assert lookup == str(right_lookup.queryset.query)
         else: