Mocking a method in an actor class

For doing unit tests, I am trying to mock a method which is defined in an actor class.
This is something I am trying to do

Actor actor = mock(Actor.class)
// This prints 1 and hence it works

However, this is pretty much useless to me. What I am more interested about is,

TestActorRef ref = TestActorRef.create(testSystem,props, “testA”);
Actor actor = ref.underlyingActor()
// This throws a Nullpointer exception

Actor actor = mock(ref.underlyingActor()) // This also throws an error

The reason why I was trying to do something like this is because my unit test tries to execute the actor with ref.tell(msg, testActor()) and I need to mock the method from an instance of the Actor Class

Any help will be appreciated

Why not subclass the Actor and have the subclass override the method to return 0? I’ve found test subclasses to be incredibly useful, especially when I want to use a TestProbe in place of a child actor that the production class creates.


That’s sounds pretty cool. Could you provide example code?