'If a query is responded to with no answers or nameserver records, the
L{Deferred} returned by L{Resolver.lookupAddress} fires with
L{ResolverError}.'

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)
