CODEWITHSUNDEEP
testingakkaactor
Asad Iqbal
Asad Iqbal

Reputation: 3321

Testing a method with Akka Actor parameters

I have a task, which I need to test. This task takes some actors as parameters, so I created a test with a TestActor as follows:

Few questions: 1. Is it a normal practice to create ActorSystem for test purposes? 2. The code doesn't end. I have tried to 

val system = ActorSystem("TestRoutingSystem")
val actorRef = system.actorOf(Props(new TestActor), name = "testActor")


var poisonReceived = false
var workReceived = 0
class TestActor extends Actor with Logging {
  def receive = {
    case msg: WorkerMessage =>
      workReceived += 1
    case x: Boolean => {
      poisonReceived = true
    }
  }
}

val t = new java.util.Timer()
val task = new TestTask(...)
task.run()
t.schedule(task, 10, 10)
system.shutdown()



Thread.sleep(150)
println(poisonReceived )
println(workReceived)

Upvotes: 0

Views: 261

Answers (1)

zella
zella

Reputation: 4685

As @nafr said, it's better to use akka-testkit

I'm not familiar with scalatest, so I write example in junit style. For example we should test some class, that send two messages to actor:

  class TimerTask(actorRef: ActorRef) {

    def run(): Unit = {
      actorRef ! "some msg"
      actorRef ! "some other msg"
    }
  }

Complete test will look like this:

import akka.actor.{ActorRef, ActorSystem}
import akka.testkit.{TestKit, TestProbe}
import org.junit.{After, Before, Test}

class TestExample {

  protected implicit var system: ActorSystem = _

  @Before
  def setup(): Unit = {
    system = ActorSystem.create("test")
  }

  @After
  def tearDown(): Unit = {
    TestKit.shutdownActorSystem(system)
  }

  @Test
  def example(): Unit = {
    val testProbe = TestProbe()

    val source = new TimerTask(testProbe.ref)

    source.run()

    testProbe.expectMsg("some msg")
    testProbe.expectMsg("some other msg")
  }
}

So answers on your question:
1) It's the only true way to test something, where actors participate
2) Use TestKit.shutdownActorSystem(system)

Upvotes: 1

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