Hi guys! 🙂 We recently updated mockk from

1.13.2

to

1.13.5

and we started having issues with some of our espresso tests (we have a bunch of mocked classes injected in those with

Koin

):

java.lang.IncompatibleClassChangeError

(zero problems in our ~2000 unit tests though) We could fix some of those by replacing the type of the mock with the concrete implementation eg

val mockedClass = mockk<Interface>()

by

val mockedClass = mockk<Implementation>()

But that doesn’t work for libraries that generate code from interfaces eg Retrofit

val mockBackendApi = mockk<BackendApi>

and we were stuck with the

IncompatibleClassChangeError

for those I know it is a bit vague so let me know if I can provide additional details. For now, we reverted back to 1.13.2, the tests are running like they used to but I’m curious if this is a mockk thing or if it’s just highlighting a problem that was already in our codebase Thanks! 🙂

maybe this error? https://kotlinlang.slack.com/archives/C9EJFT6DB/p1679676082899189

Exactly the same error! Damn, I did search the github for issues before posting, guess I was a bit too quick 🤦 😅 Thanks 🙏