public void MonitorActor_SubjectActorUp_Monitored()
{
var discoveryActor = ActorOf(Props.Create(() => new ClusterActorDiscovery(null)));
discoveryActor.Tell(new ClusterActorDiscoveryMessage.MonitorActor("test"));
discoveryActor.Tell(new ClusterActorDiscoveryMessage.RegisterActor(TestActor, "test"));
ExpectMsg<ClusterActorDiscoveryMessage.ActorUp>();
}