Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\print\vendor\symfony\css-selector\Tests\Parser\Shortcut\ClassParserTest.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print\vendor\symfony\css-selector\Tests\Parser\Shortcut\ClassParserTest.php on line 21