Fatal error: Uncaught Error: Class "Symfony\Bundle\FrameworkBundle\Test\WebTestCase" not found in C:\xampp\htdocs\electronica\vendor\sensio\framework-extra-bundle\Tests\Functional\NullableAnnotationTest.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\electronica\vendor\sensio\framework-extra-bundle\Tests\Functional\NullableAnnotationTest.php on line 8