Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\vendor\symfony\css-selector\Tests\Parser\Handler\AbstractHandlerTest.php:22 Stack trace: #0 {main} thrown in E:\xampp\htdocs\vendor\symfony\css-selector\Tests\Parser\Handler\AbstractHandlerTest.php on line 22