Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\swiftmailer-bundle\Tests\DependencyInjection\SwiftmailerExtensionTest.php:24 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\swiftmailer-bundle\Tests\DependencyInjection\SwiftmailerExtensionTest.php on line 24