Here's an older post from 2015 (also from Jane Street) explaining the same process https://blog.janestreet.com/testing-with-expectations/ https://blog.janestree

Here's an older post from 2015 (also from Jane Street) explaining the same process https://blog.janestreet.com/testing-with-expectations/ https://blog.janestreet.com/testing-with-expectations/, but at the infancy of the method. It looks like they heavily polished it! I like the approach, and I was indeed copy-pasting the result from my console...