Support nested value classes

[aSemy]

Value class support is being improved in #849

However there are issues when a value class is nested, for example

@JvmInline
value class DummyValue(val value: Int)

@JvmInline
value class DummyValueWrapper(val value: DummyValue)

Stubbing methods which use wrapped types causes exceptions

Caused by: java.lang.ClassCastException: io.mockk.it.ValueClassNestedTest$Companion$DummyValue cannot be cast to java.lang.Integer
	at io.mockk.it.ValueClassNestedTest$Companion$DummyValue.getValue(ValueClassNestedTest.kt:471)

And using any()

Failed matching mocking signature for
SignedCall(retValue=0, isRetValueMock=false, retType=class kotlin.Int, self=DummyService(#1087), method=argWrapperReturnValueClass-_ACQZD0(Int), args=[-1016248876], invocationStr=DummyService(#1087).argWrapperReturnValueClass-_ACQZD0(-1016248876))
left matchers: [any()]
io.mockk.MockKException: Failed matching mocking signature for
SignedCall(retValue=0, isRetValueMock=false, retType=class kotlin.Int, self=DummyService(#1087), method=argWrapperReturnValueClass-_ACQZD0(Int), args=[-1016248876], invocationStr=DummyService(#1087).argWrapperReturnValueClass-_ACQZD0(-1016248876))
left matchers: [any()]

And using slot()

Failed matching mocking signature for
SignedCall(retValue=, isRetValueMock=true, retType=class io.mockk.it.ValueClassNestedTest$Companion$DummyValue, self=DummyService(#1086), method=argWrapperReturnWrapper-QYKvEyQ(Int), args=[376729697], invocationStr=DummyService(#1086).argWrapperReturnWrapper-QYKvEyQ(376729697))
SignedCall(retValue=0, isRetValueMock=false, retType=class kotlin.Int, self=, method=getValue(), args=[], invocationStr=DummyValue(temporary mock).getValue())
left matchers: [slotCapture<DummyValueWrapper>()]
io.mockk.MockKException: Failed matching mocking signature for
SignedCall(retValue=, isRetValueMock=true, retType=class io.mockk.it.ValueClassNestedTest$Companion$DummyValue, self=DummyService(#1086), method=argWrapperReturnWrapper-QYKvEyQ(Int), args=[376729697], invocationStr=DummyService(#1086).argWrapperReturnWrapper-QYKvEyQ(376729697))
SignedCall(retValue=0, isRetValueMock=false, retType=class kotlin.Int, self=, method=getValue(), args=[], invocationStr=DummyValue(temporary mock).getValue())
left matchers: [slotCapture<DummyValueWrapper>()]

I've added tests as part of #849, but disabled them so nested value class support can be added later.

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[fleboulch]

I got the same issue. Is it planned to be fixed?

[aSemy]

I got the same issue. Is it planned to be fixed?

There are no plans as far as I know. I hope that this would be easy to fix. The helper functions in ValueClassSupport need to be updated to recursively unbox value classes.

https://github.com/mockk/mockk/blob/219ddafc94869feec4d808e2b1108db9a3ce005f/modules/mockk-core/src/jvmMain/kotlin/io/mockk/core/ValueClassSupport.kt

Feel free to give it a go!