def test_failedPasswordAuthentication(self):
        """
        When provided with invalid authentication details, the server should
        respond by sending a MSG_USERAUTH_FAILURE message which states whether
        the authentication was partially successful, and provides other, open
        options for authentication.

        See RFC 4252, Section 5.1.
        """
        # packet = username, next_service, authentication type, FALSE, password
        packet = b''.join([NS(b'foo'), NS(b'none'), NS(b'password'), chr(0),
                           NS(b'bar')])
        self.authServer.clock = task.Clock()
        d = self.authServer.ssh_USERAUTH_REQUEST(packet)
        self.assertEqual(self.authServer.transport.packets, [])
        self.authServer.clock.advance(2)
        return d.addCallback(self._checkFailed)

        When provided with invalid authentication details, the server should
        respond by sending a MSG_USERAUTH_FAILURE message which states whether
        the authentication was partially successful, and provides other, open
        options for authentication.

        See RFC 4252, Section 5.1.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_userauth.py