Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/pataplou/www/patrick/pataplouf/vendor/symfony/flex/tests/Update/DiffHelperTest.php:17 Stack trace: #0 {main} thrown in /home/pataplou/www/patrick/pataplouf/vendor/symfony/flex/tests/Update/DiffHelperTest.php on line 17