I have a multiplatform project and am writing unit tests for kotlinlang #multiplatform

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

06/05/2020, 5:40 PM

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

❤️ 1

Andrew

06/05/2020, 6:03 PM

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

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Arkadii Ivanov

06/05/2020, 10:40 PM

Don't mock, write fakes 😊

👍 3

Rachid

06/08/2020, 7:25 PM

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.

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.

@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

I'm happy to hear more advice or tips 🙂

Andrew

06/08/2020, 7:50 PM

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

06/08/2020, 8:23 PM

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

👍 1

Andrew

06/08/2020, 9:39 PM

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.

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