Matthew Turland has posted about some of his experience with PHPT tests with PHPUnit.

Recently, I wrote some for a project and realized that I wasn't aware of how to generate code coverage reports. Many thanks to the very helpful patrons in the #pear channel on EFNet for helping me to get this working.

He show his setup process (on Kubuntu) - grabbing the PEAR package, installing it and how to get a runner script to integrate the PHPT testing into PHPUnit.