def test_getClientAddressWithoutClient(self):
        """
        L{DummyRequest.getClientAddress} returns an L{IAddress}
        provider no C{client} has been set.
        """
        request = DummyRequest([])
        null = request.getClientAddress()
        verify.verifyObject(IAddress, null)

        L{DummyRequest.getClientAddress} returns an L{IAddress}
        provider no C{client} has been set.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/requesthelper.py