Fatal error: Uncaught Error: Class "PHP_CodeSniffer\Tests\Core\Tokenizer\AbstractTokenizerTestCase" not found in C:\xampp\htdocs\vendor\squizlabs\php_codesniffer\tests\Core\Tokenizer\BackfillReadonlyTest.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\squizlabs\php_codesniffer\tests\Core\Tokenizer\BackfillReadonlyTest.php on line 12