Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/v2appclykk/public_html/mail_manager/vendor/symfony/service-contracts/Test/ServiceLocatorTestCase.php:18 Stack trace: #0 {main} thrown in /home/v2appclykk/public_html/mail_manager/vendor/symfony/service-contracts/Test/ServiceLocatorTestCase.php on line 18