Missing documentation for running unit tests

For the purposes of this ticket I am a phpbb user who wants to participate in development. In particular I see a request for help in to fix some failing test cases. I decided to run the test suite to see whether I can fix some of the failures.

I see no documentation for how to run tests. I change to tests directory and see one php file in it. I run it.

[code]
pie@snap tests % php all_tests.php

Warning: require_once(PHPUnit/Runner/Version.php): failed to open stream: No such file or directory in /home/pie/apps/phpbb3/tests/test_framework/framework.php on line 29

Fatal error: require_once(): Failed opening required 'PHPUnit/Runner/Version.php' (include_path='.:/usr/local/share/pear') in /home/pie/apps/phpbb3/tests/test_framework/framework.php on line 29
[/code]

Actual result: error above

Expected result: a readme file in tests directory explaining what prerequisite software I need to run the tests, and how to run the tests.