Mockito matchers, scala value class and NullPointerException

Question

I'm using mockito with scalatest. I have following problem when using matcher 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…

Accepted Answer

The proper solution is:

```
case class StringValue(val text: String) extends AnyVal
case class LongValue(val value: Long) extends AnyVal

val eqFirst: StringValue = StringValue(org.mockito.Matchers.eq("first"))
val anySecond: StringValue = StringValue(org.mockito.Matchers.any[String])

val eqFirst: LongValue = LongValue(org.mockito.Matchers.eq(1L))
val anySecond: LongValue = LongValue(org.mockito.Matchers.any[Long])
```

Mockito matchers, scala value class and NullPointerException

Solution

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