Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\m-api\vendor\symfony\mailer\Test\TransportFactoryTestCase.php:29 Stack trace: #0 {main} thrown in C:\xampp\htdocs\m-api\vendor\symfony\mailer\Test\TransportFactoryTestCase.php on line 29