This project is the code behind a Future Mind's blog article.
The SchedulersTest.kt class is the one to look for. It contains a reactive chain and a set of tests to verify that specific operations (represented by animals) are made on appropriate schedulers (represented by animal classes).
It's written in Kotlin and uses RxJava 2.
You're not in the mood of running any tests and would rather just grab a pretty, colorful PDF, frame it and put over the fireplace?
Sometimes Android Studio has problems with building pure Kotlin projects (no Android dependencies). You may have to build this project from command line (gradle build) to run the tests.