Hi @Mark unfortunately I dont know any materials apart from official docs (https://www.jetbrains.org/intellij/sdk/docs/basics/getting_started.html), but I did something similar in the past like writing my own test framework for kotlin and later writing plugin for intellij idea for it. So if anything I can show you how I did that https://github.com/ghostbuster91/nspek-intellij-plugin I hope that it will help you, also I will be glad to answer your questions about my code.

Awesome, thank you so much, that’ll be extremely helpful.