“Insanity is doing the same thing over and over and expecting different results.”
Why should we test the code that hasn't changed over and over again? We thought the same. That is why we developed a tool in Swift that would run only tests relevant to your changeset.
Let's make your PR checks time faster, at the same time saving on your CI bill and CO₂ emission. On the way, we can have great fun exploring the Xcode project format, Swift Package Manager output parsing, and recursive graph algorithms. Get in and let's go!

Demo Slides https://github.com/mikeger/blog/raw/main/presentations/test_what_changed/test_what_changed.pdf