I've upgraded PHPUnit to 3.5.0 and found this:
phpunit works normal until "--repeat" option is used. With "--repeat 2" I got:
PHP Fatal error: Class 'PHPUnit_Extensions_RepeatedTest' not found in
/usr/share/pear/PHPUnit/TextUI/TestRunner.php on line 166
without it - it works.
And, btw, requiring 'PHPUnit/Extensions/TestDecorator.php' from within test didn't fix the problem.
Fixed in 0fe6936.