I have a similar request to @ephemient: It would be useful to have kotlinx-coroutines-test on the playground. It is important part of coroutines, and adding that would help writers present how to test coroutines on articles (for example https://kt.academy/article/cc-testing). I would also like to make a free course "Testing coroutines", and sending links to playground would be a better experience than forcing to setup a project.

@marcinmoskala sounds good! Feel free to follow KT-49831 to be notified about the progress.