I recommend reading The Art of Unit Testing -> https://www.manning.com/books/the-art-of-unit-testing https://www.manning.com/books/the-art-of-unit-testing . At

I recommend reading The Art of Unit Testing -> https://www.manning.com/books/the-art-of-unit-testing https://www.manning.com/books/the-art-of-unit-testing . At least this is the book I learned TDD from more than 10 years ago and the knowledge I gained from the book has proven to be timeless.