public void OrderService_PlaceOrder_OrderSummaryReturned()
{
//Arrange
var order = Get_Order_WithoutDuplicates();
_productRepo.AllItemsAreStocked();
_orderFulfillment.SetOrderFullfillmentReturn(order);
//Act
var orderSummary = _sut.PlaceOrder(order);
//Assert
orderSummary.ShouldNotBeNull();
}