Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/vincent/http/concrete5/concrete/vendor/symfony/config/Tests/Definition/NormalizationTest.php:18 Stack trace: #0 {main} thrown in /home/vincent/http/concrete5/concrete/vendor/symfony/config/Tests/Definition/NormalizationTest.php on line 18