Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\backend\vendor\slim\psr7\tests\UploadedFileTest.php:45 Stack trace: #0 {main} thrown in C:\xampp\htdocs\backend\vendor\slim\psr7\tests\UploadedFileTest.php on line 45