Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/GameAPI/Mailer/mailjet-apiv3-php-no-composer/vendor/sebastian/diff/tests/DifferTest.php:27 Stack trace: #0 {main} thrown in /var/www/html/GameAPI/Mailer/mailjet-apiv3-php-no-composer/vendor/sebastian/diff/tests/DifferTest.php on line 27