public void CreateRetailLineItems_CreatesOneRetailLineItemPerScannedItem()
{
AddFullSetOfScannedItemsToOrder();
var lineItems = InvoiceFactory.CreateRetailLineItems(_order.ScannedItems);
var lineItemScannedItemIds = lineItems.Select(x => ((RetailLineItem)x).ScannedItemId).ToList();
lineItemScannedItemIds.Should().OnlyHaveUniqueItems();
lineItemScannedItemIds.Should().BeEquivalentTo(_order.ScannedItems.Select(x => x.Id));
}