Removing a routee test

RemovingRouteeTest.cs

  [Fact]
        public async void RoundRobinGroupRouter_RouteesCanBeRemoved()
        {
            var routee1 = Actor.Spawn(MyActorProps);
            var routee2 = Actor.Spawn(MyActorProps);
            var routee3 = Actor.Spawn(MyActorProps);

            var routerProps = Router.NewRoundRobinGroup(Actor.FromProducer(() => new MyTestActor())
                                                       .WithMailbox(() => new TestMailbox()), routee1, routee2, routee3)
                              .WithMailbox(() => new TestMailbox());
            var router = Actor.Spawn(routerProps);

            router.Tell("0");
            router.Tell("1");
            router.Tell("2");

            Assert.Equal("0", await routee1.RequestAsync<string>("received?", TimeSpan.FromMilliseconds(250)));
            Assert.Equal("1", await routee2.RequestAsync<string>("received?", TimeSpan.FromMilliseconds(250)));
            Assert.Equal("2", await routee3.RequestAsync<string>("received?", TimeSpan.FromMilliseconds(250)));
            
            router.Tell(new RouterRemoveRoutee { PID = routee1 });
           
            router.Tell("3");
            router.Tell("4");

            Assert.Equal("3", await routee2.RequestAsync<string>("received?", TimeSpan.FromMilliseconds(250)));
            Assert.Equal("4", await routee3.RequestAsync<string>("received?", TimeSpan.FromMilliseconds(250)));

            router.Tell("5");
            Assert.Equal("5", await routee2.RequestAsync<string>("received?", TimeSpan.FromMilliseconds(250)));
        }