public void SubscribeBeforeSetParam() { var server = new ParameterServer(new Uri("http://localhost")); var slave = new SlaveServer("test", 0, new TopicContainer()); var observer = new ReplaySubject<KeyValuePair<string, object>>(); slave.ParameterUpdated += (key, value) => observer.OnNext(new KeyValuePair<string, object>(key, value)); server.SubscribeParam("test", slave.SlaveUri.ToString(), "test_param"); server.SetParam("test", "test_param", 5678); observer.First().Key.Is("test_param"); observer.First().Value.Is(5678); }