Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\vlucas\phpdotenv\tests\Dotenv\Loader\LoaderTest.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\vlucas\phpdotenv\tests\Dotenv\Loader\LoaderTest.php on line 17