爲expectMsg類型不匹配，需要詮釋

Question

我有一個演員以下測試類：

class SomeActorSpec extends TestKit(ActorSystem("testSystem")) 
    with ImplicitSender 
    with WordSpecLike with MustMatchers { 

    it should "check the id of a submitted job" { 
    val tester = TestProbe() 
    val someActorRef = system.actorOf(Props(classOf[SomeActor])) 

    tester.send(someActorRef, SomeMessage(UUID.randomUUID)) 
    tester.expectMsg(SomeReply("Not running")) 
    } 

} 

我得到這個錯誤：

type mismatch; 
[error] found : your.package.SomeReply 
[error] required: Int 
[error]  tester.expectMsg(SomeReply("Not running")) 

爲什麼會expectMsg需要Int？ 我查看了使用expectMsg的不同示例，並且它能夠接收Message類的子類型。

Answer 1

奇怪，它從另一個範圍加載隱式。我建議你寫的（如你剛纔的問題）是這樣的：

import java.util.UUID 

import akka.actor.{Actor, ActorSystem, Props} 
import akka.testkit.{TestKit, TestProbe} 
import org.scalatest.FlatSpec 

class SomeActorSpec extends FlatSpec { 

    it should "check the id of a submitted job" in new TestScope { 
    val tester = TestProbe() 

    tester.send(someActorRef, SomeMessage(UUID.randomUUID)) 
    tester.expectMsg(SomeReply("Not running")) 
    } 

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

case class SomeMessage(v: UUID) 
case class SomeReply(msg: String) 

class SomeActor() extends Actor { 
    def receive = { 
    case msg => sender() ! SomeReply("Not running") 
    } 
}