static Money fakeShipperTotal(Shipper* shipper)
{
	return initMoney(0);
}
static void fakeShipperAddItem(Shipper* shipper, const char* sku, int quantity, Weight weight)
{
}
ShipperBehavior fakeBehavior = { &fakeShipperTotal, &fakeShipperAddItem };
Shipper* fakeShipperCreate(const char* orderId, ShippingOption option)
{
	Shipper* result = shipperCreate(orderId, option);
	result->behavior = &fakeBehavior;
	return result;
}

• The first one takes a Shipper as an argument.
• The second one creates the Shipper object and passes it into the first one.
• We then code our tests against the first one.

// ShippingOrder.c
void shippingOrderPrepareToShipWithShipper(ShippingOrder *shippingOrder, Shipper *shipper)
{
	LineItem *item = orderGetItems(shippingOrder->m_baseOrder);
	while (item != NULL)
	{
		shipperAddItem(shipper, lineItemGetSku(item), lineItemGetQuantity(item), 
				lineItemGetExtendedWeight(item));
		item = item->m_nextItem;
	}
	shippingOrder->m_shippingTotal = shipperTotal(shipper);
}
void shippingOrderPrepareToShip(ShippingOrder* shippingOrder)
{
	Shipper* shipper = shipperCreate(orderGetOrderId(shippingOrder->m_baseOrder), 
			shippingOrder->m_option);
	shippingOrderPrepareToShipWithShipper(shippingOrder, shipper);
	shipperDestroy(shipper);
}

static Shipper* shipper = NULL;
static void setUp(void)
{
	…
	shipper = fakeShipperCreate(orderGetOrderId(baseOrder), ShippingOption_AIR);
}
static void tearDown(void)
{
	shippingOrderDestroy(shippingOrder);
	shipperDestroy(shipper);
}
...
static void testShippingAmountSingle(void)
{
	orderAdd(baseOrder, oneLarge);
	shippingOrderPrepareToShipWithShipper(shippingOrder, shipper);
	ASSERT_TRUE(moneyEquals(initMoney(1), shippingOrder->m_shippingTotal));
}
static void testShippingAmountMultiple(void)
{
	smallProduct = productCreate("SKU002", "Small Widget", initMoney(4.56), initWeight(0.10));
	oneSmall = lineItemCreate(smallProduct, 1);
	orderAdd(baseOrder, oneLarge);
	orderAdd(baseOrder, oneSmall);
	shippingOrderPrepareToShipWithShipper(shippingOrder, shipper);
	ASSERT_TRUE(moneyEquals(initMoney(2), shippingOrder->m_shippingTotal));
}