Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\masterminds\html5\test\HTML5\TestCase.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\masterminds\html5\test\HTML5\TestCase.php on line 8