public void DeviceGroup_actor_must_be_able_to_list_active_devices_after_one_shuts_down()
{
var sys = ActorSystem.Create("mysys");
var probe = new TestKit().CreateTestProbe();
var groupActor = sys.ActorOf(DeviceGroup.Props("group"));
groupActor.Tell(new RequestTrackDevice("group", "device1"), probe.Ref);
probe.ExpectMsg <DeviceRegistered>();
var toShutDown = probe.LastSender;
groupActor.Tell(new RequestTrackDevice("group", "device2"), probe.Ref);
probe.ExpectMsg <DeviceRegistered>();
groupActor.Tell(new RequestDeviceList(requestId: 0), probe.Ref);
probe.ExpectMsg <ReplyDeviceList>(s => s.RequestId == 0 &&
s.Ids.Contains("device1") &&
s.Ids.Contains("device2"));
probe.Watch(toShutDown);
toShutDown.Tell(PoisonPill.Instance);
probe.ExpectTerminated(toShutDown);
// using awaitAssert to retry because it might take longer for the groupActor
// to see the Terminated, that order is undefined
probe.AwaitAssert(() =>
{
groupActor.Tell(new RequestDeviceList(requestId: 1), probe.Ref);
probe.ExpectMsg <ReplyDeviceList>(s => s.RequestId == 1 && s.Ids.Contains("device2") &&
!s.Ids.Contains("device1"));
});
}