CODEWITHSUNDEEP
scalaakka
bsky
bsky

Reputation: 20222

not found: value expectMsg

I have the following test for an Akka component:

import somePackage.SomeActor
import akka.actor.{ActorSystem, Props}
import org.scalatest.{FlatSpec, Matchers}

class SomeActorSpec extends FlatSpec with Matchers {

  val system = ActorSystem()
  val someActorRef = system.actorOf(Props(classOf[SomeActor]))


  it should "check the id" in {
    someActorRef ! CheckIfJobIsRunning(UUID.randomUUID)
    expectMsg(SomeOtherMessage(List()))
  }

}

I get the error:

 not found: value expectMsg
[error]     expectMsg(SomeOtherMessage(List()))

I have two questions:

1.How can I use expectMsg?

2.Where do I define, SomeOtherMessage, which should be received by the test class?

Upvotes: 1

Views: 113

Answers (1)

Nikita
Nikita

Reputation: 4515

Use TestKit scope. Your example should look like:

class SomeActorSpec extends FlatSpec with Matchers {
  it should "check the id" in new Scope {
    someActorRef ! CheckIfJobIsRunning(UUID.randomUUID)
    expectMsg(SomeOtherMessage(List()))
  }

  abstract class Scope extends TestKit(ActorSystem()) {
    val someActorRef = system.actorOf(Props(classOf[SomeActor]))
  }
}

More info in docs. Regarding your questions:

  1. Use expectMsg to test that actor sends SomeOtherMessage to some other actor when it receives CheckIfJobIsRunning
  2. Define CheckIfJobIsRunning, SomeOtherMessage and others in some Protocol-like file which contains all messages related to your actor. I personally use companion object of actor to specify all these messasges.

Upvotes: 2

Related Questions