Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/html/test-project/my-app/vendor/symfony/translation-contracts/Test/TranslatorTest.php:31 Stack trace: #0 {main} thrown in /var/www/html/test-project/my-app/vendor/symfony/translation-contracts/Test/TranslatorTest.php on line 31