Oh my gosh... This project and its readme are amazing. I gotta try this at work tomorrow, I hope my co-workers can bear with me.

Edit: I just found the release notes... I love it

In Rust, the tests usually sit right next to the source code, even in the same file. That’s partly because the compiler can just strip the tests from the final binary, and I assume partly just conventional. In Python, you usually want to keep the tests out of the final sdist/wheel, so the setup you described is probably the most common in bigger projects.