def test_defaultReactor(self):
        """
        Giving no reactor argument to L{http.HTTPFactory.__init__} means it
        will select the global reactor.
        """
        from twisted.internet import reactor
        factory = http.HTTPFactory()
        self.assertIs(factory._reactor, reactor)

        Giving no reactor argument to L{http.HTTPFactory.__init__} means it
        will select the global reactor.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_web.py