setupSteps() public static method

Set up CheckoutPage_Controller decorators for managing steps
public static setupSteps ( $steps = null )
 public function setUp()
 {
     parent::setUp();
     ShopTest::setConfiguration();
     //set up steps
     SteppedCheckout::setupSteps();
     //use default steps
     $this->socks = $this->objFromFixture("Product", "socks");
     $this->socks->publish('Stage', 'Live');
     $checkoutpage = $this->objFromFixture("CheckoutPage", "checkout");
     $checkoutpage->publish('Stage', 'Live');
     $this->checkout = new CheckoutPage_Controller();
     $this->checkout->handleRequest(new SS_HTTPRequest("GET", "checkout"), DataModel::inst());
     $this->cart = $this->objFromFixture("Order", "cart");
     ShoppingCart::singleton()->setCurrent($this->cart);
 }
<?php

define('SHOP_DIR', basename(__DIR__));
define('SHOP_PATH', BASE_PATH . DIRECTORY_SEPARATOR . SHOP_DIR);
Object::useCustomClass('Currency', 'ShopCurrency', true);
if ($checkoutsteps = CheckoutPage::config()->steps) {
    SteppedCheckout::setupSteps($checkoutsteps);
}