StatefulnessBetweenTestsWithImplicitSenderSpec.scala

package utils

import akka.actor.{Actor, ActorSystem}
import akka.testkit.{ImplicitSender, TestActorRef, TestKit}
import org.scalatest.FunSuiteLike

import scala.concurrent.duration._

class StatefulnessBetweenTestsWithImplicitSenderSpec extends TestKit(ActorSystem("MyTestSystem"))
with FunSuiteLike
with ImplicitSender {

  test("1st test") {

    val testActorRef: TestActorRef[MyActorWithState] = TestActorRef[MyActorWithState]
    testActorRef ! "Hello"

    //sending the message and watching asserting the right state of the underlying actor
    //the answer is not being consumed by some expect-method
    assert(testActorRef.underlyingActor.state == "Hello")
  }

  test("2nd test") {

    val testActorRef: TestActorRef[MyActorWithState] = TestActorRef[MyActorWithState]
    testActorRef ! "World"

    //expecting a message --> taking the first message off the mailbox
    val answer = expectMsgType[String](10.milliseconds)
    assert(answer == "World")
  }
}

class MyActorWithState extends Actor {
  var state: String = _

  override def receive: Receive = {
    case x: String =>
      state = x
      sender() ! state
  }
}


/*
Test-Output

[info] StatefulnessBetweenTestsWithImplicitSenderSpec:
[info] - 1st test
[info] - 2nd test *** FAILED ***
[info]   "[Hello]" did not equal "[World]" (StatefulnessBetweenTestsWithImplicitSenderSpec.scala:30)

 */