How to test ReceiveTimeout in Akka typed

[Urs Peter]

Hi,

I'm struggling with testing Behaviour/Actor termination in Akka typed. The examples below should be self explanatory:

- test actor termination in the classic way works as expected

However, I could not figure out how to do the same test with Akka typed, especially:

- testing behaviour/ typed actor termination with the ActorTestKit

- testing behaviour/ typed actor termination with the BehaviorTestKit

Help would be much appreciated!

Urs

import akka.actor.testkit.typed.Effect.ReceiveTimeoutSet
import akka.actor.testkit.typed.javadsl.BehaviorTestKit
import akka.actor.{Actor, ActorSystem, PoisonPill, Props, ReceiveTimeout}
import akka.actor.testkit.typed.scaladsl.ActorTestKit
import akka.actor.typed.{Behavior, Terminated}
import akka.actor.typed.scaladsl.Behaviors
import org.scalatest.BeforeAndAfterAll
import org.scalatest.matchers.should.Matchers
import org.scalatest.wordspec.AnyWordSpecLike

import scala.concurrent.duration._

class ReceiveTimeoutSpec extends AnyWordSpecLike with Matchers with BeforeAndAfterAll {


  "Works fine: Classic ReceiveTimeout" should {

    "terminate classic actor - works as expected" in {
      val classic = ActorSystem("classic")
      val classicTestKit = new TestKit(classic)
      class TimeoutActor extends Actor {
        context.setReceiveTimeout(500 millis)

        override def receive: Receive = {
          case ReceiveTimeout => self ! PoisonPill
        }
      }
      val timeoutActor = classic.actorOf(Props(new TimeoutActor()))
      classicTestKit.watch(timeoutActor)
      classicTestKit.expectTerminated(timeoutActor)
    }
  }

  "Questions: ??? Typed ReceiveTimeout ???" should {
    val timeoutBehavior: Behavior[String] = Behaviors.setup[String] { context =>
      context.setReceiveTimeout(500 millis, "terminated")
      Behaviors.receiveMessage {
        case "terminated" => Behaviors.stopped
      }
    }
    "??? terminate typed actor with ActorTestKit - but how ???" in {
      val actorTestKit = ActorTestKit()
      val timeout = actorTestKit.spawn(timeoutBehavior)
      //how to watch that behaviour has terminated???
    }
    "??? terminate typed actor with BehaviorTestKit - but how ???" in {
      val behaviorTestKit = BehaviorTestKit.create(timeoutBehavior)
      //works ...
      behaviorTestKit.expectEffect(ReceiveTimeoutSet(500 millis, "terminated"))
      //...but how to intercept the actual termination (-> Stopped) without sending a message???


    }
  }
}

[Urs Peter]

Answering part of my own question: 

I figured out how to watch termination of a typed actor, relying on the classic converters which requires the following import import akka.actor.typed.scaladsl.adapter._:

"!!! terminate typed actor with ActorTestKit - that's how !!!" in {
  import akka.actor.typed.scaladsl.adapter._
  val actorTestKit = ActorTestKit()
  implicit val classicActorSystem = actorTestKit.system.toClassic
  val probe = TestProbe()
  val timeout = actorTestKit.spawn(timeoutBehavior)
  probe.watch(timeout.toClassic)
  probe.expectTerminated(timeout.toClassic)
}

I assume that's the way to go. If not please let me know. 

Concerning the BehaviorTestKit approach I would still look for an answer.

[Roland Kuhn]

Hi Urs,

you can use isAlive to check whether the behavior in the BehaviorTestKit has terminated or not. You’ll have to manually feed the actor the "terminated" message (making the test timing-independent as a bonus), then you can check for termination.

Regards,

Roland

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