Integrate PHPT test cases with PHPUnit

How can I get PHPUnit to run my PHPT test cases and integrate the pass/fail status into the overall metrics? I am already aware of how to run these tests using run-phpt from the command line, but I want to run them from within PHPUnit with my other tests.

I'm aware that the PHPUnit_Extensions_PhptTestCase exists but I couldn't find any samples on how to use it.