单元测试 – 使用Mokito模拟Akka Actor的日志对象

class LogWriter extends Actor{
  def receive{
    case x:Timing => log.info(x toString)
    case x:Event => log.info(x toString)
    case x:Any => log.warning("Improper message sent to LogWriter,%s".format(x toString))
  }
}

但是尝试使用Specs2和Mockito支持进行单元测试,其中包括以下内容：

class LogWriterSpec extends Mokito with Specification{
  val mockedLog = mock[Logger]

  class MockedLogWriter extends LogWriter{
    @transient override val log = mockedLog
  }

  val writer = actorOf(new MockedLogWriter).start

  def testTiming = {
    val message = Timing("testTiming",15 seconds)
    writer !! (message,400)
    there was one(mockedLog).info(message toString)
  }

  def is = "A LogWriter" ^
    "should write a Timing message to log.info" ! testTiming ^
  end
}

在编译上述NullPointerException的结果时：

[akka:event-driven:dispatcher:global-10] ERROR akka.actor.Actor$- Problem
java.lang.NullPointerException
    at akka.util.Logger.warning_$qmark(Logging.scala:43)
    at akka.util.Logger.warning(Logging.scala:117)

我尝试改变它以使用一些mixin特性,它覆盖了Akka Logging特性的“log”对象,但是编译器不允许它.编译器的回复类似于“我们不希望你犯下无意的错误”.啊!我想要那个“错误”.

有人知道另一种方式吗？我不会坚持Mockito并欢迎任何建议.