def test_answerless(self):
        servers = {
            ('1.1.2.3', 53): {
                ('example.com', A): {
                    },
                },
            }
        resolver = self._getResolver(servers)
        d = resolver.lookupAddress('example.com')
        return self.assertFailure(d, ResolverError)
If a query is responded to with no answers or nameserver records, the
dataset/ETHPy150Open twisted/twisted/twisted/names/test/test_rootresolve.py/RootResolverTests.test_answerless