Great book! If you want to know Unit Testing in Swift, then read this book. This book has been a great help for me to setup and understang Unit Testing in my company iOS project.
It's a great book for context on the way testing in iOS works, having a good testing background on other languages helps a lot, because the author emphasises the fact that testing in iOS might be a little different than other platforms due to the story of apples platforms.
It also touches up on beginner concepts, so it's a great place to start and also a great place to improve
Another great book from Paul. If you’ve been wondering about unit tests or haven’t had the courage to tackle Test Driven Development yet, I definitely recommend this book.
"Too many companies suffer from what I call Ready, Fire, Aim – they have a great team and a great idea, but charge off writing production code without taking the time to plan a more careful approach."