diff -r 850cbd54cc73 Lib/test/test_curses.py
--- a/Lib/test/test_curses.py	Sun May 17 14:56:20 2015 -0400
+++ b/Lib/test/test_curses.py	Sun May 17 20:56:18 2015 -0400
@@ -377,6 +377,17 @@
         # can be called.
         curses.update_lines_cols()
 
+    def test_haskey_replacement(self):
+        # if _curses lacks has_key, curses imports curses.has_hey.has_key
+        import _curses
+        keep = _curses.has_key
+        del keep
+        del sys.modules['curses']
+        from curses.has_key import has_key
+        import curses
+        self.assertEqual(curses.has_key, has_key)
+        _curses.has_key = keep
+
 
 if __name__ == '__main__':
     unittest.main()