-    define('PHPUNIT_COMPOSER_INSTALL', dirname(__DIR__).'/vendor/autoload.php');
-    require PHPUNIT_COMPOSER_INSTALL;
-    PHPUnit\TextUI\Command::main();
+    if (PHP_VERSION_ID >= 80000) {
+        require dirname(__DIR__).'/vendor/phpunit/phpunit/phpunit';
+    } else {
+        define('PHPUNIT_COMPOSER_INSTALL', dirname(__DIR__).'/vendor/autoload.php');
+        require PHPUNIT_COMPOSER_INSTALL;
+        PHPUnit\TextUI\Command::main();
+    }