def test_noPayloadSERVICE_ACCEPT(self):
        """
        Some commercial SSH servers don't send a payload with the
        SERVICE_ACCEPT message.  Conch pretends that it got the correct
        name of the service.
        """
        self.proto.instance = MockService()
        self.proto.ssh_SERVICE_ACCEPT(b'') # no payload
        self.assertTrue(self.proto.instance.started)
        self.assertEqual(len(self.packets), 0) # not disconnected

        Some commercial SSH servers don't send a payload with the
        SERVICE_ACCEPT message.  Conch pretends that it got the correct
        name of the service.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_transport.py