Akka.Tests.Actor.SupervisorHierarchySpec.A_supervisor_hierarchy_must_resume_children_after_Resume C# (CSharp) Method

        public void A_supervisor_hierarchy_must_resume_children_after_Resume()
        {
            //Build this hierarchy:
            //     boss
            //      |
            //    middle
            //      |
            //    worker
            var boss = ActorOf<Resumer>("resumer");
            boss.Tell("spawn:middle");
            var middle = ExpectMsg<IActorRef>();
            middle.Tell("spawn:worker");
            var worker = ExpectMsg<IActorRef>();

            //Check everything is in place by sending ping to worker and expect it to respond with pong
            worker.Tell("ping");
            ExpectMsg("pong");
            EventFilter.Warning("expected").ExpectOne(() => //expected exception is thrown by the boss when it crashes
            {
                middle.Tell("fail");    //Throws an exception, and then it's resumed
            });

            //verify that middle answers
            middle.Tell("ping");
            ExpectMsg("pong");

            //verify worker (child to middle) is up
            worker.Tell("ping");
            ExpectMsg("pong");

        }
        [Fact]