Akka FSM和TestKit将共享测试放入Trait中，使发送者成为最后期限

Question

我试图将一些常见的Akka FSM代码的一些常见测试纳入一个特征，但是发送者引用正在变成deadletters。使用以下FSM代码：

import akka.actor.FSM
import akka.testkit.TestFSMRef
import akka.testkit.TestKit
import akka.actor.ActorSystem
import org.scalatest.Matchers
import org.scalatest.WordSpecLike
import akka.testkit.ImplicitSender

sealed trait MyState
case object StateA extends MyState
case object StateB extends MyState

case class MyData(ignored: Option[Int] = None)

class MyFSM extends FSM[MyState, MyData] {
  startWith(StateA, MyData())

  val common: StateFunction = {
    case Event(_, _) =>
      System.err.println(s"sender is $sender")
      sender ! s"hello $stateName"
      stay
  }

  when(StateA)(common)

  when(StateB)(common)
}

class StateASpec extends TestKit(ActorSystem()) with WordSpecLike with Matchers with ImplicitSender {

  def testCommonBehaviour(testState: MyState) {
    val fsm = TestFSMRef(new MyFSM())
    fsm.setState(testState, MyData())
    fsm ! "hello fsm"
    expectMsg("hello StateA")
  }

  "StateA" should {
    "respond to common test case" in {
      testCommonBehaviour(StateA)
    }
  }
}

class StateBSpec extends TestKit(ActorSystem()) with WordSpecLike with Matchers with ImplicitSender {

  def testCommonBehaviour(testState: MyState) {
    val fsm = TestFSMRef(new MyFSM())
    fsm.setState(testState, MyData())
    fsm ! "hello fsm"
    expectMsg("hello StateB")
  }

  "StateB" should {
    "respond to common test case" in {
      testCommonBehaviour(StateB)
    }
  }
}

当我尝试将常见的测试逻辑转换成一个特征时：

trait TraitOfTests {
  self: TestKit with ImplicitSender =>

  def testCommonBehaviour(testState: MyState) {
    val fsm = TestFSMRef(new MyFSM())
    fsm.setState(testState, MyData())
    fsm ! "hello fsm"
    expectMsg("hello $testState")
  }
}

class StateASpec extends TestKit(ActorSystem()) with WordSpecLike with Matchers with ImplicitSender  with TraitOfTests {

  "StateA" should {
    "respond to common test case" in {
      testCommonBehaviour(StateA)
    }
  }
}

class StateBSpec extends TestKit(ActorSystem()) with WordSpecLike with Matchers with ImplicitSender  with TraitOfTests {

  "StateB" should {
    "respond to common test case" in {
      testCommonBehaviour(StateB)
    }
  }
}

回复给了截止日期演员：

发件人是参与者[Akka://default/deadletters][INFO][11/30/2014 16:15:49.812][default-Akka.actor.default-dispatcher-2][Akka://default/deadletters]从TestActor[Akka://default/user/$$b]到参与者[Akka://default/deadletters]的消息[java.lang.string]未传递。[1]遇到的一纸空文。可以通过配置设置'Akka.log-dead-letters'和'Akka.log-dead-letters-dhider-shutdown'关闭或调整此日志记录。

Answer 1

解决这个问题的一个方法是对您的共同特征进行轻微的重新设计，如下所示：

trait TraitOfTests {
  self: TestKit =>

  def testCommonBehaviour(testState: MyState)(implicit sender:ActorRef) {
    val fsm = TestFSMRef(new MyFSM())
    fsm.setState(testState, MyData())
    fsm ! "hello fsm"
    expectMsg("hello $testState")
  }
}

如果您在TestCommonBehavior上定义了隐式发送器，那么您可以确信它将正确地从通过ImplicitSender使其可用的测试中提取它