[2.1.4] nextStateData during onTransition

[Marius Stroe]

Hi,

I have this code: https://gist.github.com/Marius-Stroe/621ca2a49509e9928d76  Unfortunately, the output is: https://gist.github.com/Marius-Stroe/2976d93ff98ebdf86cc4

It seems I can't access "nextStateData" inside "onTransition". Is it a bug or am I doing something wrong? Thank you.

Kind regards,

-- Marius

[Marius Stroe]

The output comes when running a test with specs2. The setup is:

val actorRef = TestFSMRef(spy(new FSMActor))

val fsm = actorRef.underlyingActor.asInstanceOf[FSMActor]

doReturn(testActor).when(fsm).child("childName")

Another issue is that "actorRef.underlyingActor" returns "scala.Nothing" and I can't spy the underlying actor. Nevertheless, spying the underlying non-FSM actor works with "TestActorRef". I would expect the TestFSMRef to work exactly like TestActorRef. I've created another thread for this issue.

Kind regards,

-- Marius

[Roland Kuhn]

Hi Marius,

while I don’t see what’s wrong in your case (or whether you have cut out too much in the code you show), here is our test case which verifies this:

  class OtherFSM(target: ActorRef) extends Actor with FSM[Int, Int] {

    startWith(0, 0)

    when(0) {

      case Event("tick", _) ⇒ goto(1) using (1)

    }

    when(1) {

      case _ ⇒ stay

    }

    onTransition {

      case 0 -> 1 ⇒ target ! ((stateData, nextStateData))

    }

  }

Methods like “spy” look suspicious by definition ;-)

Regards,

Roland

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Dr. Roland Kuhn
Akka Tech Lead
Typesafe – Reactive apps on the JVM.
twitter: @rolandkuhn

[Marius Stroe]

Hi Roland,

I agree, I've seen the tests for FSMs. I wanted to use the TestFSMRef which I don't remember to be seen used in any test on Akka repository.

I think it's related to the other topic: https://groups.google.com/forum/#!topic/akka-user/_vyn98faY0w  I'll wait to give that fix a try and see what happens.

Kind regards,

--

Marius

[Marius Stroe]

It seems that nextStateData is not available using Mockito's spy().

It works with:

val actorRef = TestFSMRef(new FSMActor, "test-fsm")

but it doesn't work with:

val actorRef = TestFSMRef(spy(new FSMActor), "test-fsm")

val actorRef = TestActorRef(spy(new FSMActor), "test-fsm")

Sometimes, it can be useful to spy and stub some functions :-) Is Akka team considering this an issue? As a side note, spy() works well with TestActorRef and a normal actor.

Kind regards,

[Patrik Nordwall]

On Mon, Jun 24, 2013 at 11:30 PM, Marius Stroe <laurent...@gmail.com> wrote:

It seems that nextStateData is not available using Mockito's spy().

It works with:

val actorRef = TestFSMRef(new FSMActor, "test-fsm")

but it doesn't work with:

val actorRef = TestFSMRef(spy(new FSMActor), "test-fsm")

val actorRef = TestActorRef(spy(new FSMActor), "test-fsm")

Sometimes, it can be useful to spy and stub some functions :-) Is Akka team considering this an issue?

Mockito spy documentation comes with a lot of warnings and gotchas. I'm don't what kind of problem it introduces with TestFSMRef and it is not something we will investigate. Feel free to submit suggestion of how to make TestFSMRef spy friendly if it is of importance for you.

/Patrik

--

Patrik Nordwall
Typesafe -  The software stack for applications that scale
Twitter: @patriknw