Also, it seems like Optics is VERY handy for cleanly setting up fixtures in unit tests... but for now I'd rather not have all the deps of optics included in the main app, just the

@optics

annotation and have optics generate even the data classes from the main app code only for the testing environment. Is that possible?

Yes, that should be possible. KSP is the tool that decides where the code is generated. I remember doing this somewhere, but its been a long time I can’t remember where or where I left the code :/

So just using

kspTest

will generate everything in the testing module (even from the main module), or does this need a special setup?

You can rely on arrow-annotations for just the annotation.

It would be sooo nice if the docs for each module would have it's maven module/s there for handy reference... part of them are in getting started, but when one is reading the docs about optics, obviously they'd want to include that in their build, whereas not everyone getting started would.