Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\sabberworm\php-css-parser\tests\CSSList\DocumentTest.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\sabberworm\php-css-parser\tests\CSSList\DocumentTest.php on line 14