public void DeleteFromOrderTest() { int totalPrice = 0; totalPrice += _itemInfo.GetItemPrice("item0"); _itemOrder.AddToOrder("item0"); Assert.AreEqual(totalPrice, _itemOrder.GetTotalPrice()); _itemOrder.DeleteFromOrder(-1); Assert.AreEqual(totalPrice, _itemOrder.GetTotalPrice()); _itemOrder.DeleteFromOrder(1); Assert.AreEqual(totalPrice, _itemOrder.GetTotalPrice()); totalPrice -= _itemInfo.GetItemPrice("item0"); _itemOrder.DeleteFromOrder(0); Assert.AreEqual(totalPrice, _itemOrder.GetTotalPrice()); }