There are solutions which provide the ability to automatically run your tests as you code. This tutorial shows how to use a Ruby gem, called watchr to monitor your code and automatically run the appropriate tests whenever you save your work. This is how you can automated Test-Driven Development (TDD) on your PHP code. The watchr gem is an executable program written in Ruby, and it wraps around features found in an operating system’s file system to provide the ability to watch for changes made to a specific file or folder. The tutorial provides a step by step approach on how to use it and integrate it in your PHP coding activities.