You have to mock whatever is inside the inline call

# mockk

[LeoColman]

You have to mock whatever is inside the inline call

[v79]

Oh dear. There is a lot of code in that function... And it's the code inside that I want to test.

[LeoColman]

What do you mean?

[LeoColman]

The thing is: the inline modifier makes the function not exist in bytecode. It only exists in the source code

[LeoColman]

Because everything inside it is replaced at compile time

[LeoColman]

If the function is big, I'd suggest extracting every bit you can out of it

[LeoColman]

And if inline is not really necessary, remove it alltogether

[v79]

I have to say, this is beyond me. Kotlin encourages all these inline functions and lambdas, but testing code which uses them hurts my brain.

[LeoColman]

I suspect that perhaps you're misusing lambdas and inline functions

[LeoColman]

They're easy to test

[LeoColman]

But you should test what they do, not how they do

[LeoColman]

If you test that every call is called and that it calls the static methods in that exact order, everything will turn into hard to test!

[LeoColman]

I use and abuse Lambdas and Inlines at #kotlintest and at my work, and I never had a problem with them

[LeoColman]

Perhaps you're placing too many calls inside the inline functions? Perhaps you're trying to mock a part of code that should be executed, not mocked?

[LeoColman]

I usually only mock external dependencies, not lambdas or inlines

[v79]

All I want to do is mock my way around reading a directory of files...

project.dirs.sources.walk().forEachIndexed { index, mdFile ->
	val inputStream = mdFile.inputStream()
	val document = parseMarkdown(inputStream)
}

[LeoColman]

In this cases I usually have that reading in a class or function, such as readInputStream(file)

[LeoColman]

And I mock that function

[LeoColman]

And it's not inlined, as that won't use any of inline features

[LeoColman]

I will never mock the forEachIndexed function

[v79]

OK, I've got a lot to learn it seems. Kotlin makes it very easy to just through yourself in, but working alone also means it's easy to pick up bad habits.

[v79]

Thanks for your time 🙂