def test_roundtripValue(self):
        """
        C{self.value} can be round-tripped over an XMLRPC method call/response.
        """
        d = self.proxy.callRemote('defer', self.value)
        d.addCallback(self.assertEqual, self.value)
        return d

        C{self.value} can be round-tripped over an XMLRPC method call/response.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_xmlrpc.py