def test_noneAuthentication(self):
        """
        A client may request a list of authentication 'method name' values
        that may continue by using the "none" authentication 'method name'.

        See RFC 4252 Section 5.2.
        """
        d = self.authServer.ssh_USERAUTH_REQUEST(NS(b'foo') + NS(b'service') +
                                                 NS(b'none'))
        return d.addCallback(self._checkFailed)

        A client may request a list of authentication 'method name' values
        that may continue by using the "none" authentication 'method name'.

        See RFC 4252 Section 5.2.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_userauth.py