def test_applicationDataBeforeSimpleCommand(self):
        """
        Application bytes received before a command are delivered before the
        command is processed.
        """
        self._deliver(
            b'x' + telnet.IAC + telnet.NOP,
            ('bytes', b'x'), ('command', telnet.NOP, None))

        Application bytes received before a command are delivered before the
        command is processed.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_telnet.py