Hello, I have a.`sealed class Either` which either a `Left` or a `Right` But actually no, because in...

# mockk

[jmfayard]

Hello,
I have a.sealed class Either which either a Left or a Right
But actually no, because in my unit tests, mockk creates a subclass of Either which is neither Left nor Right and break the contract of my type
Is there a way to forbit mockkk to create a subclass of a sealed class?

[eurycea]

Do you need to mock an Either or are you wanting a warning/error when you try to mock a sealed class?

[jmfayard]

I want Koin to crash

[ephemient]

currently no

[ephemient]

in the near future https://youtrack.jetbrains.com/issue/KT-41214 will enable JVM support for sealed classes to prevent unauthorized subclasses even through reflective means

[jmfayard]

Thanks, I +1ed the issue

Wouldn't it be possible in the meantime to add to the sealed class an interface or an annotation like @ForbidMockk to tell explicitely that the class is not to be mocked?

[jmfayard]

I've found an acceptable solution

JvmMockKGateway.anyValueGeneratorFactory = { voidInstance ->
    object : JvmAnyValueGenerator(voidInstance) {
        override fun anyValue(cls: KClass<*>, isNullable: Boolean, orInstantiateVia: () -> Any?): Any? {
            if (cls == Either::class) return Either.Left(MockingError)
            return super.anyValue(cls, isNullable, orInstantiateVia)
        }
    }
}