public void NotSubscribed() { using (var pub = new XPublisherSocket()) using (var sub = new XSubscriberSocket()) { var port = pub.BindRandomPort("tcp://127.0.0.1"); sub.Connect("tcp://127.0.0.1:" + port); // let the subscriber connect to the publisher before sending a message Thread.Sleep(500); pub.SendFrame("Hello"); Assert.IsFalse(sub.TrySkipFrame()); } }