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- [Chris] Imagine this scenario. You're a PHP developer who has an old legacy code base that you need to fix bugs and add new features to. This code is old and crufty, and you are often afraid to change anything out of fear of breaking it. You also know that you should be writing tests for this application, because you've heard so many other people talk about unit testing, but have no idea where to start. Test-driven development sounds great, but you have all this existing code to worry about. Wouldn't it be great if you knew someone who could guide you through all the concepts you need to understand, and show you how to actually build these testing scenarios and then turn them into working tests? I'm that person. My name is Chris Hartjes, and I'm here to help you learn how to write tests for legacy PHP code bases. I've been using PHP since 1998 and talking to folks about writing tests for their code since 2003. In this course, I want to teach you the fundamental concepts and skills…