Mockito scala验证测试不起作用(播放框架)

class TaskQueueConfig(conf: Configuration) {
  val schedulingEnabled = conf.getBoolean("schedulingEnabled").get
  val processingEnabled = conf.getBoolean("processingEnabled").get
  val queueName = conf.getString("queue").get
}

我正在使用play 2.1.1的默认测试设置来测试它：

class ConfigTestSpec extends Specification with Mockito with CalledMatchers {
  "TaskQueueConfig" should {
     "verify calls" in {
      val tqConf = mock[Configuration]
      tqConf.getString("queue") returns Some("queueName")
      tqConf.getBoolean("schedulingEnabled") returns Some(true)
      tqConf.getBoolean("processingEnabled") returns Some(true)
      Logger.error("setup done")

      val config = new TaskQueueConfig(tqConf)

      there was one(tqConf).getString("queue")
      there were two(tqConf).getBoolean(any[String])
      there were one(tqConf).getBoolean("schedulingEnabled")
      there were one(tqConf).getBoolean("processingEnabled")
    }
  }
}

我收到以下错误：

[error] x verify calls
[error]    The mock was not called as expected:
[error]    configuration.getString$default$2();
[error]    Wanted 1 time:
[error]    -> at config.ConfigTestSpec$$anonfun$2$$anonfun$apply$4$$anonfun$apply$12.apply(ConfigTestSpec.scala:61)
[error]    But was 2 times. Undesired invocation:
[error]    -> at config.TaskQueueConfig.<init>(TaskQueueConfig.scala:10) (ConfigTestSpec.scala:61)

这很奇怪,因为代码非常孤立,在TaskQueueConfig中显然只有1个conf.getString调用.第10行是带有getString方法的行.第61行是“有一个(tQConf).getString”的行

我该如何解决这个问题？

(和之间没有区别).

PS：我知道这个例子对于测试是没有用的,但我有更复杂的配置,其中有一些规则需要测试.

更新1
getString方法有两个参数,第二个参数的默认值为None(它的类型是Option [Set [String]]).当我明确地将None添加到设置和验证时,它仍然不起作用.但是当我添加null时,我会让它工作.

val tqConf = mock[Configuration]

  tqConf.getString("queue",null) returns Some("queueName")
  tqConf.getBoolean("schedulingEnabled") returns Some(true)
  tqConf.getBoolean("processingEnabled") returns Some(true)

  val c = new TaskQueueConfig(tqConf)

  there was one(tqConf).getString("queue",null)
  there was one(tqConf).getString(any[String],any[Option[Set[String]]])
  there were two(tqConf).getBoolean(any[String])
  there was one(tqConf).getBoolean("schedulingEnabled")
  there was one(tqConf).getBoolean("processingEnabled")

  c.processingEnabled must beTrue
  c.schedulingEnabled must beTrue
  c.queueName must be("queueName")

所以我想现在的问题是,为什么我必须使用null？