Checkout Success Page Tester

gistfile1.php

<?php
class Ifuel_Successtest_IndexController extends Mage_Core_Controller_Front_Action
{
    /**
    * Success page redirect
    */
    public function testAction()
    {
        if (!Mage::helper('core')->isDevAllowed()) {
            $this->_forward('noroute');
            return;
        }

        $orderId = (int)$this->getRequest()->getParam('order_id');

        // Load the order
        $order = Mage::getModel('sales/order')->load($orderId);
        Mage::getSingleton('checkout/type_onepage')->getCheckout()
            ->setLastOrderId($order->getId())
            ->setLastSuccessQuoteId($order->getQuoteId())
            ->setLastQuoteId($order->getQuoteId());

        $this->_redirectUrl('/checkout/onepage/success/');

        return;
    }
}