Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/astechc1/public_html/vendor/symfony/swiftmailer-bundle/Tests/DependencyInjection/SwiftmailerExtensionTest.php:24 Stack trace: #0 {main} thrown in /home/astechc1/public_html/vendor/symfony/swiftmailer-bundle/Tests/DependencyInjection/SwiftmailerExtensionTest.php on line 24