Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app3/public_html/service/vendor/symfony/var-dumper/Tests/HtmlDumperTest.php:21 Stack trace: #0 {main} thrown in /home/app3/public_html/service/vendor/symfony/var-dumper/Tests/HtmlDumperTest.php on line 21