Good morning. I have a problem migrating my small integration test suite to Kotest. I have a custom

MockAppExtension

(previously

MockAppRule

) that sets up Koin with Ktor’s `MockEngine`s and in-memory SqlDelight database. I have 3 test classes with 17 tests in total. If I run a single class, all of them pass with no problem, but if I run tests for the whole module, 2 out of 17 fail with

io.ktor.serialization.JsonConvertException: Illegal input

on a network request I wonder what could make the difference 🤔 I tried with different `IsolationMode`s

I gave up on Ktor's mockserver, I found everything needs to be done manually... I ended up using WireMock with a kotlin wrapper lib I found, it encourages to write better tests and constraints.

I don’t have experience with WireMock, but I found Ktor-mock excellent! The MockEngine is not very versatile, but with a small trick, I’ve been able to: • Have “static” and isolated `MockEngine`s, like

TraktAuthEngine

,

TmdbMovieEngine

,etc, that can be reused easily for Unit tests • Merge multiple `MockEngine`s into a single one, to use for Integration tests • Add dynamic handlers to override a single request If you’re interested, here are my utils; still need some refactor, specially regarding

MockEngine.plus

where there is some code duplicated from below, but it does its job https://github.com/4face-studi0/CineScout/blob/main/cinescout/network/src/commonMain/kotlin/cinescout/network/testutil/ktorEngineUtils.kt

Nice! I tried starting with something like that, but I found it much easier to use this: https://github.com/marcinziolo/kotlin-wiremock

Thanks! Looks cool!