How do you test repositories which touch network inside? mockwebserver+json files?

for unit tests fake implementation of API abstraction

you can use #mockk to achieve what @gildor mentioned

Mock/stub/fake depending on how complex API is and what it should do

so you manually write all the ApiFooResponse objects and contents? ughh, I wanted to avoid that

Yes, but how it's different from mocked webserver? Isn't it exactly the same, you have to provide some response data

well yes that was my original idea, grabbing the response jsons and inject them via mockwebserver

But if you have retrofit you already have interface, which can be replaced with stab implementation, which can return any data to you repository

yes not problem here, I'm just lazy to manually write the response objects which in my stupid api are n-levels deep, 20vals each etc; with jsons I could just grab those from curl and run it through moshi

You can do this in your stab