def METHOD_NAME(
    self,
) -> Generator["Deferred[object]", object, None]:
    dns_client_mock = Mock()
    dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
    service_name = b"test_service.example.com"
    entry = Mock(spec_set=["expires", "priority", "weight"])
    entry.expires = 0
    entry.priority = 0
    entry.weight = 0
    cache = {service_name: [cast(Server, entry)]}
    resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
    servers: List[Server]
    servers = yield defer.ensureDeferred(
        resolver.resolve_service(service_name)
    )  # type: ignore[assignment]
    dns_client_mock.lookupService.assert_called_once_with(service_name)
    self.assertEqual(len(servers), 1)
    self.assertEqual(servers, cache[service_name])