Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\programs\xampp\htdocs\laravel-blog-api\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php:16 Stack trace: #0 {main} thrown in D:\programs\xampp\htdocs\laravel-blog-api\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php on line 16