We're happy to have your bug fixes, corrections or other contributions.
If you're submitting code changes we'd ask that you use Composer to install PHPUnit, then run our existing tests:
$ curl -s https://getcomposer.org/installer | php
$ php composer.phar install --dev
$ vendor/phpunit/phpunit/phpunit Tests/
If you're adding new functionality, we'd love it if you could include tests. We understand not everyone is comfortable writing tests, so submit a pull request and we can help you with the tests.
The current code is inconsistent but we'd like to try to follow the PEAR coding standards.
If you want to do style cleanups, put them in separate commits from functional changes so the patches are easier to review.