Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app/htdocs/lidia/vendor/symfony/dependency-injection/Tests/Extension/ExtensionTest.php:18 Stack trace: #0 {main} thrown in /home/app/htdocs/lidia/vendor/symfony/dependency-injection/Tests/Extension/ExtensionTest.php on line 18