Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/devmindz/public_html/laravel/catalog_admin/vendor/sebastian/diff/tests/DiffTest.php:20 Stack trace: #0 {main} thrown in /home/devmindz/public_html/laravel/catalog_admin/vendor/sebastian/diff/tests/DiffTest.php on line 20