fix lookup of __ceil__
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 297cc35..0979880 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -1581,6 +1581,7 @@
             ("__format__", format, format_impl, set(), {}),
             ("__floor__", math.floor, zero, set(), {}),
             ("__trunc__", math.trunc, zero, set(), {}),
+            ("__ceil__", math.ceil, zero, set(), {}),
             ]
 
         class Checker(object):