Hi. This is a simplified version of the issue I ha...

# mockk

[Raul]

Hi. This is a simplified version of the issue I have. I've got this in an Android project

class A(){
   val flow: Flow<Boolean> = flowOf(true)
}

class B (a: A) {
   val otherFlow = a.flow
}

and in one test:

@RelaxedMockK //or MockK, I've tried both
    protected lateinit var a: A
    
    protected lateinit var b: B
    
    @Before
    fun setUp() {
        MockKAnnotations.init(this, relaxed = true)
        b = B(a)
    }

This is working fine with MockK 1.13.3, but after updating to 1.13.4 I'm getting the error

java.lang.IncompatibleClassChangeError: Superclass kotlinx.coroutines.flow.Flow of kotlinx.coroutines.flow.Flow_1_Proxy is an interface (declaration of 'kotlinx.coroutines.flow.Flow_1_Proxy' appears in /data/user/0/com.mypackage.myapp.debug/app_dxmaker_cache/Generated_2115397682.jar)

Am I missing something? 🤷 🤔

[Raul]

it's working in Unit test, and failing in instrumental test, if that info rings anyone's bell

[Jonas]

We have a similar issue on our side. Also downgraded to 1.13.3 for the time being. Will check again later if it is the exact same issue.

[Jonas]

Yes, same issue:

java.lang.IncompatibleClassChangeError: Superclass kotlinx.coroutines.flow.StateFlow of kotlinx.coroutines.flow.StateFlow_1_Proxy is an interface (declaration of 'kotlinx.coroutines.flow.StateFlow_1_Proxy' appears in

[Jonas]

Any idea what could have changed @Mattia Tommasone?

[Mattia Tommasone]

no idea off the top of my head, let me investigate

[Mattia Tommasone]

it appears to be because of incompatible class versions
what kotlin version are you on?

[Jonas]

1.8.10

atm

[Mattia Tommasone]

weird
can you do a test with 1.8.0?

[Jonas]

yes - give me a second

[Jonas]

same issue

[Jonas]

Is there anything else I can test for you?

[Jonas]

For future reference:
https://github.com/mockk/mockk/issues/1035