Mockito matchers, scala value class and NullPointException

[Marek Kliś]

Hi all,

I'm using mockito with scalatest. I have following problem when using matchers with value class.

import org.scalatest.FlatSpec
import org.scalatest.mock.MockitoSugar
import org.mockito.BDDMockito._
import org.mockito.Matchers.any

case class FirstId(val value: String) extends AnyVal
case class SecondId(val value: String) extends AnyVal

trait MockedClass {
  def someMethods(firstId: FirstId, secondId: SecondId): Int
}

class ValueClassSpec() extends FlatSpec with MockitoSugar {

  val mockedClass = mock[MockedClass]
  val secondId = SecondId("secondId")

  "Matchers" should "work for value class" in {
    // given
    given(mockedClass.someMethods(any[FirstId], org.mockito.Matchers.eq(secondId))).willReturn(3)
    // when
    val result = mockedClass.someMethods(FirstId("firstId"), secondId)
    // then
    assert(result == 3)
  }
}

and the result is:

ValueClassSpec:
Matchers
- should work for value class *** FAILED ***
  java.lang.NullPointerException:
  at io.scalac.fow.party.ValueClassSpec$$anonfun$1.apply$mcV$sp(ValueClassSpec.scala:22)
  at io.scalac.fow.party.ValueClassSpec$$anonfun$1.apply(ValueClassSpec.scala:20)
  at io.scalac.fow.party.ValueClassSpec$$anonfun$1.apply(ValueClassSpec.scala:20)
  at org.scalatest.Transformer$$anonfun$apply$1.apply(Transformer.scala:22)
  at org.scalatest.Transformer$$anonfun$apply$1.apply(Transformer.scala:22)
  at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
  at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
  at org.scalatest.Transformer.apply(Transformer.scala:22)
  at org.scalatest.Transformer.apply(Transformer.scala:20)
  at org.scalatest.FlatSpecLike$$anon$1.apply(FlatSpecLike.scala:1639)
  ...

I found similar question on stackoverflow (http://stackoverflow.com/questions/19974493/scala-value-classes-and-mockito-matchers-dont-play-together) but without any advice.

Is there any posibility to use mockito matchers with scala value class?

Lib versions: scala 2.11.2, mockito 1.10.8, scalatest 2.1.6

I posted it to stackoverflow too - http://stackoverflow.com/questions/27289757/mockito-matchers-scala-value-class-and-nullpointexception

Best regards,
Marek Kliś

[Szczepan Faber]

Hey,

I'm not sure, I'm not using scala too much these days. any() returns
null just like majority of matcher methods. You might work around the
problem by using anyObject() matcher. I'm open to changes (pull
requests ;) that help with scala integration.

Cheers!

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--
Szczepan Faber
Core dev@gradle; Founder@mockito

[Marek Kliś]

Hi,

I found solution:

val anyFirstId: FirstId = any[String].asInstanceOf[FirstId]

val eqSecondId: SecondId = org.mockito.Matchers.eq[String](secondId.value).asInstanceOf[SecondId]

given(mockedClass.someMethods(anyFirstId, eqSecondId)).willReturn(3)

Best regards,

Marek Kliś

[Przemek Piotrowski]

Has somebody found workaround to the case, when value class wraps an Int or Long? 

http://stackoverflow.com/questions/28111015/mockito-stubbing-method-with-value-class-argument-fails-with-nullpointerexceptio