def test_delegationLookupError(self):
        servers = {
            ('1.1.2.3', 53): {
                ('example.com', A): {
                    'authority': [('example.com', Record_NS('ns1.example.com'))],
                    },
                ('ns1.example.com', A): {
                    'rCode': ENAME,
                    },
                },
            }
        resolver = self._getResolver(servers)
        d = resolver.lookupAddress('example.com')
        return self.assertFailure(d, DNSNameError)
If there is an error resolving the nameserver in a delegation response,
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/names/test/test_rootresolve.py/RootResolverTests.test_delegationLookupError