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