sebastianbergmann/phpunit — pull request #1282 by dg (2014-06-06 03:54:08+00:00)
Title: Travis checks if PHPUnit correctly fails.

This may seem like nonsense, but there are a lot of places where I can make a mistake and PHPUnit will always report that everything is OK. Example: https://github.com/dg/phpunit/commit/541db3b3c78c8564fbe184f8f0003269eaad095b

Therefore, it is necessary to test that PHPUnit can fail too.