correctly lookup __dir__
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index aafe428..c74e232 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -1595,6 +1595,7 @@
             # probably not worth it.
             # ("__enter__", run_context, iden),
             # ("__exit__", run_context, iden),
+            ("__dir__", dir, empty_seq, set(), {}),
             ]
 
         class Checker(object):