Example using static

example1.cs

[Collection("EventStream Tests")]
public class DeadLetterTests
{
    [Fact]
    public void WhenActorStopped_MessagesGoToDeadLetter()
    {
        bool deadLetterEventReceived = false;
        EventStream.Instance.Subscribe<DeadLetterEvent>(@event => deadLetterEventReceived = true);

        var props = Actor.FromProducer(() => new DoNothingActor())
                         .WithMailbox(() => new TestMailbox());
        var pid = Actor.Spawn(props);
        pid.Stop();
        pid.Tell("did you die?");

        Assert.True(deadLetterEventReceived);
    }
}