Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\form\Test\FormIntegrationTestCase.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\form\Test\FormIntegrationTestCase.php on line 21