The other day I was reading about TDD when I’ve found a cool repository in Github about this topic done by Luca Minudel. I read his paper which I recommend if you are interested to know more about his study.
After reading the exercises in that repository I though it could be a good idea to convert the Kata into Swift to do the exercises later with the aim to improve the skills in Swift, TDD and Refactoring legacy code.
In this link you can find the Kata in Swift and here the slides with the instructions. If you do it, ping me with your solution!