Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\Apache24\www\sciegen\backend\vendor\symfony\mailer\Test\TransportFactoryTestCase.php:29 Stack trace: #0 {main} thrown in D:\Apache24\www\sciegen\backend\vendor\symfony\mailer\Test\TransportFactoryTestCase.php on line 29