def test_OPTS(self):
        """
        When the server receives 'OPTS something', it should report
        that the FTP server does not support the option called 'something'.
        """
        d = self._anonymousLogin()
        self.assertCommandFailed(
            'OPTS something',
            ["502 Option 'something' not implemented."],
            chainDeferred=d,
            )
        return d

        When the server receives 'OPTS something', it should report
        that the FTP server does not support the option called 'something'.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_ftp.py