Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\Backend_v.004\vendor\reliese\laravel\tests\Coders\Model\Relations\RelationHelperTest.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\Backend_v.004\vendor\reliese\laravel\tests\Coders\Model\Relations\RelationHelperTest.php on line 6