def METHOD_NAME(self):
    """
    L{SyslogObserver.emit} uses the value of the C{'syslogPriority'} as the
    syslog priority, if that key is present in the event dictionary.
    """
    self.observer.emit(
        {
            "message": ("hello, world",),
            "isError": False,
            "system": "-",
            "syslogFacility": stdsyslog.LOG_CRON,
        }
    )
    self.assertEqual(
        self.events, [(stdsyslog.LOG_INFO | stdsyslog.LOG_CRON, "[-] hello, world")]
    )