Vladimir Khorikov is the author of the book Unit Testing Principles, Practices, and Patterns: https://amzn.to/2QXS2ch He has been professionally involved in software development for over 15 years, including mentoring teams on the ins and outs of unit testing. He's also the founder of the Enterprise Craftsmanship blog, where he reaches 500 thousand software developers yearly. He started as an adviser on general programming topics, but lately has shifted his focus to unit testing with a central message of teaching software developers how to make unit testing painless.