def test_notFoundChild(self):
        """
        L{ResourceScriptDirectory.getChild} returns a resource which renders an
        response with the HTTP I{NOT FOUND} status code if the indicated child
        does not exist as an entry in the directory used to initialized the
        L{ResourceScriptDirectory}.
        """
        path = self.mktemp()
        os.makedirs(path)
        resource = ResourceScriptDirectory(path)
        request = DummyRequest([b'foo'])
        child = resource.getChild("foo", request)
        d = _render(child, request)
        def cbRendered(ignored):
            self.assertEqual(request.responseCode, NOT_FOUND)
        d.addCallback(cbRendered)
        return d

        L{ResourceScriptDirectory.getChild} returns a resource which renders an
        response with the HTTP I{NOT FOUND} status code if the indicated child
        does not exist as an entry in the directory used to initialized the
        L{ResourceScriptDirectory}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_script.py