def test_simpleReprs(self):
        """
        Verify that the various Box objects repr properly, for debugging.
        """
        self.assertEqual(type(repr(amp._SwitchBox('a'))), str)
        self.assertEqual(type(repr(amp.QuitBox())), str)
        self.assertEqual(type(repr(amp.AmpBox())), str)
        self.assertIn("AmpBox", repr(amp.AmpBox()))

        Verify that the various Box objects repr properly, for debugging.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_amp.py