diff -r 04ff1cc40d62 Lib/test/test_dict.py
--- a/Lib/test/test_dict.py	Fri Oct 04 11:38:59 2013 -0400
+++ b/Lib/test/test_dict.py	Fri Oct 04 23:47:03 2013 +0800
@@ -45,6 +45,9 @@
         self.assertEqual(set(d.keys()), set())
         d = {'a': 1, 'b': 2}
         k = d.keys()
+        self.assertEqual(set(k), {'a', 'b'})
+        self.assertIn('a', k)
+        self.assertIn('b', k)
         self.assertIn('a', d)
         self.assertIn('b', d)
         self.assertRaises(TypeError, d.keys, None)