#19166: use an unused var in a test. Patch by Vajrasky Kok.

Lib/test/test_dict.py

@@ -45,6 +45,9 @@ class DictTest(unittest.TestCase):
         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)