How do I add to wishlist in magento 1.9 by programatically?

$wishlist = Mage::getModel('wishlist/wishlist')->loadByCustomer($customerId, true);
$product = Mage::getModel('catalog/product')->load($productId);

$buyRequest = new Varien_Object(array()); // any possible options that are configurable and you want to save with the product

$result = $wishlist->addNewItem($product, $buyRequest);
$wishlist->save();