def test_serviceDefaultReactor(self):
        """
        L{strports.service} will use the default reactor when none is provided
        as an argument.
        """
        from twisted.internet import reactor as globalReactor
        aService = strports.service("tcp:80", None)
        self.assertIs(aService.endpoint._reactor, globalReactor)

        L{strports.service} will use the default reactor when none is provided
        as an argument.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_strports.py