'L{SyslogObserver.emit} uses the value of the C{\'system\'} key to prefix
the logged message.'

def test_emitCustomSystem(self):

    self.observer.emit({'message': ('hello,    world',), 'isError': False, 'system': 'nonDefaultSystem'})
    self.assertEqual(self.events, [(stdsyslog.LOG_INFO, '[nonDefaultSystem]    hello,    world')])
