public async Task Test_Add_Existence_Fail()
{
var sys = Setup();
var testActor = ActorOf(BlackHoleActor.Props);
var reply = await sys.Containers[0].Ask<Message.AddReply>(new Message.Add(10, testActor));
Assert.Equal(10, reply.Id);
Assert.Equal(testActor, reply.Actor);
Assert.Equal(true, reply.Added);
var reply2 = await sys.Containers[1].Ask<Message.AddReply>(new Message.Add(10, testActor));
Assert.Equal(10, reply2.Id);
Assert.Equal(testActor, reply2.Actor);
Assert.Equal(false, reply2.Added);
}