Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/mysaferhost/laravelproject.com/l10-task-list/vendor/symfony/mailer/Test/TransportFactoryTestCase.php:29 Stack trace: #0 {main} thrown in /home/mysaferhost/laravelproject.com/l10-task-list/vendor/symfony/mailer/Test/TransportFactoryTestCase.php on line 29