Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app/htdocs/message_gateway/vendor/symfony/http-kernel/Tests/HttpCache/SubRequestHandlerTest.php:20 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/symfony/http-kernel/Tests/HttpCache/SubRequestHandlerTest.php on line 20