I have a multiplatform project and am writing unit...

# multiplatform

[Rachid]

I have a multiplatform project and am writing unit tests for common code. It appears that Mockk isn't supported yet. Does anyone know how to mock classes in common source sets?

[Himanshu Sharma]

you can provide your own test implementation of the classes and mock your implementation
something like 👇
https://github.com/android/architecture-samples/tree/master/app/src/mock/java/com/example/android/architecture/blueprints/todoapp

[Andrew]

No idea if this works, but is it possible to do the testing on a platform side like JVM?

[Arkadii Ivanov]

Don't mock, write fakes 😊

[Rachid]

Yeah I did end up writing a "test" Impl for this test. But in general it's faster and less code to just inject a Mock and verify interaction with the Mock.

[Rachid]

Don't mock, write fakes - @Arkadii Ivanov for higher level tests I can agree on that. But for most unit tests this seems like more unnecessary effort/code.

[Rachid]

@Andrew, I could test my code on JVM only, but then I have no tests covering the code for the JS target for example. I'm new to multiplatform, but I thought it would be wise to cover all targets

[Rachid]

I'm happy to hear more advice or tips 🙂

[Andrew]

I don't know enough about JS to answer this, but if you had a pure JS library can you mock unit test that? If so you might be able to do that in Kotlin on the JS module.

[Arkadii Ivanov]

My favorite article https://medium.com/@june.pravin/mocking-is-not-practical-use-fakes-e30cc6eaaf4e 😀

[Andrew]

You can also get the best of both by extending a mock class to include default behavior + convenience methods for simpler setup of common setup boilerplate.

[Andrew]

Although not applicable to the current question since mock isn't available