如何在akka演员中测试公共方法？

Question

我有一个akka演员:

class MyActor extends Actor {
  def recieve { ... }

  def getCount(id: String): Int = {
    //do a lot of stuff
    proccess(id)
    //do more stuff and return
  }
}

我正在尝试为getCount方法创建单元测试:

it should "count" in {
    val system = ActorSystem("Test")
    val myActor = system.actorOf(Props(classOf[MyActor]), "MyActor")

    myActor.asInstanceOf[MyActor].getCount("1522021") should be >= (28000)
}

但它不起作用:

  java.lang.ClassCastException: akka.actor.RepointableActorRef cannot be cast to com.playax.MyActor

我该如何测试这种方法？

Answer 1

做这样的事情:

import org.scalatest._
import akka.actor.ActorSystem
import akka.testkit.TestActorRef
import akka.testkit.TestKit

class YourTestClassTest extends TestKit(ActorSystem("Testsystem")) with FlatSpecLike with Matchers {

  it should "count plays" in {
    val actorRef = TestActorRef(new MyActor)
    val actor = actorRef.underlyingActor
    actor.getCount("1522021") should be >= (28000)
  }
}

Answer 2

我通常建议将由Actor执行的任何"业务逻辑"分解为一个单独的类,该类作为构造函数参数提供或通过Cake组件提供.这样做简化了Actor,只留下了保护长期可变状态和处理传入消息的责任.它还有助于测试业务逻辑(通过使其单独用于单元测试)以及Actor如何通过在测试Actor本身时提供模拟/间谍实例或组件来与该逻辑交互.