Just figured out it works somehow in the

jvmTest

source set when adding

io.ktor:ktor-client-mock-jvm:$ktor_version

to the

jvmTest.dependencies

closure. Not really what I wanted, since I’d like to test it for all targets, not just jvm. Furthermore I figured out, I can’t write the test I want to. My idea was to test an

interceptor

I added, which adds an query param to the

defaultRequest

by using the

MockEngine

and checking the correct url is called. But a) I can’t replace the engine of a client and b) even if I could, the interceptor I wrote is part of the

engine

and would have been overwritten if I could use the

MockEngine

🤔

So two questions: 1) How can I write a test using the

MockEngine

in

commonTest

? 2) How would I test the above mentioned interceptor?