CODEWITHSUNDEEP
scalamockitospecs2playframework-2.4
aveuiller
aveuiller

Reputation: 1551

Call doAnswer with function as argument in scala play 2.4

I want to mock a method taking a callback in argument let's say:

methodToMock[T](callback: (String, String) => T)

With play 2.3, (specs2 version 2.3.8) I managed to do it with the method doAnswer from mockito:

doAnswer({ invocation =>
  val method = invocation.asInstanceOf[(String, String) => Any] // L.34
  method(role, key)
}).when(myMock).methodToMock[Any](any)

But since play 2.4 (using special dependency specs2, version 2.4.2), the previous code won't work, telling me:

[Ljava.lang.Object; cannot be cast to scala.Function2 (MySpec.scala:34)

I don't really understand why mockito start using Java objects in my code, since I'm using the specs2 implementation and didn't find any documentation about modifications on doAnswer, nor usage example of my use case.

Do you have any idea of what I did wrong and a way to solve this?

EDIT:

I wanted to show a simplified case, but that deleted the source of the problem... The real definition of the method also takes an implicit arguments list:

methodToMock[T](callback: (String, String) => T)(implicit value: String)

Which means that specs2 seems to return an array instead of a single element (its behaviour really changed between the two versions though).

The following code now works 

doAnswer({ invocation =>
  val firstArgList = invocation.asInstanceOf[Array[Object]](0)
  val method = firstArgList.asInstanceOf[(String, String) => Any] // L.34
  method(role, key)
}).when(myMock).methodToMock[Any](any)(any)

Upvotes: 1

Views: 1740

Answers (1)

Eric
Eric

Reputation: 15557

Which version of specs2 are you using? With 3.6.5 (the latest) the following works fine

case class T() {
  def methodToMock[A](callback: (String, String) => A) = 1
}

val m = mock[T]

doAnswer({ invocation =>
  val method = invocation.asInstanceOf[(String, String) => Any] // L.34
  method("role", "key")
}).when(m).methodToMock[Any](any)

m.methodToMock((s: Any, s2: Any) => s.toString.size + s2.toString.size) === 7

Upvotes: 1

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