Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /mnt/volume_lon1_01/backend/admin/vendor/phar-io/manifest/tests/values/PhpExtensionRequirementTest.php:18 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/phar-io/manifest/tests/values/PhpExtensionRequirementTest.php on line 18