Fatal error: Uncaught Error: Class "Symfony\Bundle\FrameworkBundle\Test\KernelTestCase" not found in /home/flighto/e-commerce/vendor/sylius/mailer-bundle/src/Bundle/tests/Functional/DefaultSenderTest.php:21 Stack trace: #0 {main} thrown in /home/flighto/e-commerce/vendor/sylius/mailer-bundle/src/Bundle/tests/Functional/DefaultSenderTest.php on line 21