Fatal error: Uncaught Error: Class "Masterminds\HTML5\Tests\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\masterminds\html5\test\HTML5\Serializer\OutputRulesTest.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\masterminds\html5\test\HTML5\Serializer\OutputRulesTest.php on line 9