Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\filp\whoops\tests\Whoops\Util\SystemFacadeTest.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\filp\whoops\tests\Whoops\Util\SystemFacadeTest.php on line 6