def test_Quit(self):
        """
        Issuing QUIT should return a 221 message.

        @return: L{Deferred} of command response
        """
        d = self._anonymousLogin()
        return self.assertCommandResponse(
            'QUIT',
            ['221 Goodbye.'],
            chainDeferred=d)

        Issuing QUIT should return a 221 message.

        @return: L{Deferred} of command response
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_ftp.py