public void The_total_is_the_total_price_of_multiple_scanned_items()
{
var unit = new Checkout(_itemCatalogue, _discounts);
_basket.TakeItem().Returns(_item1, _item2, null);
_itemCatalogue.LookupPrice(_item1).Returns(_item1Price);
_itemCatalogue.LookupPrice(_item2).Returns(_item2Price);
_discounts.GetApplicable(Arg.Any <Collection <IPurchaseable> >()).Returns(new Discount(0));
unit.Scan(_basket);
var expected = _item1Price.AsCurrency() + _item2Price.AsCurrency();
Assert.That(unit.GetTotal().AsCurrency(), Is.EqualTo(expected));
}
private void ScanItem(IPurchaseable item)
{
var itemPrice = _itemCatalogue.LookupPrice(item);
_subtotal = _subtotal.Add(itemPrice);
_scannedItems.Add(item);
}