Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/html/wiki_2023/extensions/TimedMediaHandler/tests/phpunit/TimedText/VttWriterTest.php:14 Stack trace: #0 {main} thrown in /var/www/html/wiki_2023/extensions/TimedMediaHandler/tests/phpunit/TimedText/VttWriterTest.php on line 14