I really struggled getting a kotlin multiplatform project working with tdd nicely, it seemed a lot of the documentation was well out of date so I wrote a substack blog post series on it :
https://ronnev.substack.com/
and the barebones project I have is here:
https://github.com/vextorspace/KotlinMultiplatformTesting
This includes the ability to load common resource files from commonTest/resources in all the different test targets.
I hope it helps someone!