fix: autoload helpers in test bootstrap

Author: kenjis

system/Test/bootstrap.php

@@ -75,6 +75,7 @@
 
 // Initialize and register the loader with the SPL autoloader stack.
 Services::autoloader()->initialize(new Autoload(), new Modules())->register();
+Services::autoloader()->loadHelpers();
 
 // Now load Composer's if it's available
 if (is_file(COMPOSER_PATH)) {