silverstripe-framework/tests/php/Security/SecurityTest/SecuredController.php

<?php

namespace SilverStripe\Security\Tests\SecurityTest;

use SilverStripe\Control\Controller;
use SilverStripe\Dev\TestOnly;
use SilverStripe\Security\Permission;
use SilverStripe\Security\Security;

class SecuredController extends Controller implements TestOnly
{
	private static $allowed_actions = array('index');

	public function index()
	{
		if (!Permission::check('ADMIN')) {
			return Security::permissionFailure($this);
		}

		return 'Success';
	}

	public function Link($action = null)
	{
		return Controller::join_links('SecurityTest_SecuredController', $action, '/');
	}
}