Fatal error: Uncaught Error: Class "PHP_CodeSniffer\Tests\Core\Tokenizer\AbstractTokenizerTestCase" not found in C:\xampp\htdocs\vendor\squizlabs\php_codesniffer\tests\Core\Tokenizer\StableCommentWhitespaceTest.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\squizlabs\php_codesniffer\tests\Core\Tokenizer\StableCommentWhitespaceTest.php on line 20