Master PHP unit testing with PHPUnit in this comprehensive tutorial. Learn essential techniques including setting up tests, making assertions, handling failures, and using color-coded feedback. Explore object and class testing, '@test' annotations, and filtering options for individual test runs. Configure PHPUnit using phpunit.xml, implement autoloading for test classes, and understand test scopes. Dive into setUp() and tearDown() methods, error and exception testing, and advanced concepts like test doubles, mock objects, and method mocking. Discover how to inject mock test dependencies, verify method call frequency, and organize tests into groups. Access source code on GitHub and enhance your PHP testing skills with practical examples and expert guidance.