PHPUnit is a great tool to protect us developers from introducing new defects when adding new features or re-factoring code. However there is one HUGE downside to PHPUnit; it must be installed using PEAR. Personally, I don't like 'auto-installers', I'd prefer to know what exactly is happening behind the scenes with regards to which libraries are required and how they are being called. [...] After breaking down the PHPUnit source code, I realized it could be installed without going through PEAR, and without too much headache.

He walks you through the directories you'll need to set up (test/vendor), the commands you'll need to get the latest version and unpack it, changes to set up some symlinks and updating the PHPUnit source to modify the autoloader, bootstrap and phpunit executable.