测试预期消息的模式匹配 [英] Pattern matching on testing expected message

问题描述

如果我不知道所有消息的详细信息，如何使用akka testkit测试预期的消息？我可以使用下划线 _吗？

How can I test expected message with akka testkit if I don't know all message details? Can I use somehow underscore "_"?

示例我可以测试：

echoActor ! "hello world"
expectMsg("hello world")

我要测试的示例

case class EchoWithRandom(msg: String, random: Int)

echoWithRandomActor ! "hi again"
expectMsg(EchoWithRandom("hi again", _))

The我不想使用的方式：

The way i don't want to use:

echoWithRandomActor ! "hi again"
val msg = receiveOne(1.second)
msg match {
    case EchoWithRandom("hi again", _) => //ok
    case _ => fail("something wrong")
}

推荐答案

您似乎对此无能为力，因为 expectMsg 使用 == 幕后

It doesn't look like you can do much about it, because expectMsg uses == behind the scenes.

您可以尝试使用 expectMsgPF ，其中PF来自 PartialFunction ：

echoWithRandomActor ! "hi again"
expectMsgPF() {
  case EchoWithRandom("hi again", _) => ()
}

更新

在最新版本（当前为 2.5.x ）中，您需要 TestProbe 。

Update

In recent versions (2.5.x at the moment) you need a TestProbe.

您还可以从 expectMsgPF 返回一个对象。可能是您要进行模式匹配的对象或对象的一部分。这样，您可以在 expectMsgPF 成功返回后进行进一步检查。

You can also return an object from the expectMsgPF. It could be the object you are pattern matching against or parts of it. This way you can inspect it further after expectMsgPF returns successfully.

import akka.testkit.TestProbe

val probe = TestProbe()

echoWithRandomActor ! "hi again"

val expectedMessage = testProbe.expectMsgPF() { 
    // pattern matching only
    case ok@EchoWithRandom("hi again", _) => ok 
    // assertion and pattern matching at the same time
    case ok@EchoWithRandom("also acceptable", r) if r > 0 => ok
}

// more assertions and inspections on expectedMessage

有关更多信息，请参见 Akka测试。

See Akka Testing for more info.

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