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Does anyone know how I can mock functions when writing unit tests?

Mockk has some experimental support of mocking for Kotlin JS
<http://mockk.io/>

But why do you need this?
Usually it’s a bad sign if you want to mock top level function

If I have  a class calling methods from another class, I don't care about the operations in that class, just the return values, shouldn't I be mocking the methods being called?

But this is a mocking of methods, it’s not the same as mocking top level functions

Ah yes. Sorry, I was using the wrong terminology. I want to mock methods, not top level functions.