@Paul Woitaschek Have you tried the

kotlin-allopen

plugin?

That will make everything all-open, not just the tests

allopen is only for classes with an annotation that you specify, so you could annotate only the types you want to mock

Then I could just Mark them as open

@Paul Woitaschek You also must mark all the mocked methods as open, allopen can help with it

@Paul Woitaschek there's no difference if all your data classes are open or not, it will only work through reflection, you still can't inherit from it in your normal code