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