Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\vendor\squizlabs\php_codesniffer\tests\Core\Ruleset\ShowSniffDeprecationsTest.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\squizlabs\php_codesniffer\tests\Core\Ruleset\ShowSniffDeprecationsTest.php on line 22