Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/includes/php-ffmpeg/vendor/symfony/cache/Tests/Adapter/NullAdapterTest.php:21 Stack trace: #0 {main} thrown in /var/www/html/includes/php-ffmpeg/vendor/symfony/cache/Tests/Adapter/NullAdapterTest.php on line 21