Interface INoImplicitSender

Normally test classes has TestActor as implicit sender. So when no sender is specified when sending messages, TestActor is used. When a a test class implements INoImplicitSender this behavior is removed and the normal behavior is restored, i.e. NoSender is used as sender when no sender has been specified. 

public class WithImplicitSender : TestKit
{
   public void TheTestMethod()
   {
      ...
      someActor.Tell("message");             //TestActor is used as Sender
      someActor.Tell("message", TestActor);  //TestActor is used as Sender
   }
}

public class WithNoImplicitSender : TestKit, INoImplicitSender
{
   public void TheTestMethod()
   {
      ...
      someActor.Tell("message");    //ActorRefs.NoSender is used as Sender
   }
}

Namespace: Akka.TestKit
Assembly: Akka.TestKit.dll
Syntax
public interface INoImplicitSender

Extension Methods