Mike Naberezny has posted about some improvements that were made to the PHPUnit testing software lately (support for TestNG-style groupings) and how, with a few of his own suggestions it was made a bit more flexible.

At my company, we typically organize our test case classes into high-level groups such as unit and functional. Method-level group annotations are inconvenient for us because we'd need to annotate every method of every test case class.

He includes an example of their use - commenting a testing class and running it through the phpunit command line tool with a call to the testing group's name.