Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\Application\www\E-Tracking\vendor\symfony\http-kernel\Tests\HttpCache\SubRequestHandlerTest.php:20 Stack trace: #0 {main} thrown in D:\Application\www\E-Tracking\vendor\symfony\http-kernel\Tests\HttpCache\SubRequestHandlerTest.php on line 20