public void UpdateIngredientWorks()
        {
            var positionList = new PositionListDataHolder(new PositionRepositoryStub());

            positionList.LoadPositionList();
            var ingredient1 = new DTOIngredient(5, 1, new DTOSize(1, "size1", new Money(1), new DTOPosition(1, "1", "1")),
                                                new DTO.Consumable(1, "water", 1));

            positionList.AddIngredient(ingredient1);
            var ingredient2 = new DTOIngredient(5, 2, new DTOSize(1, "size1", new Money(1), new DTOPosition(1, "1", "1")),
                                                new DTO.Consumable(1, "water", 1));

            positionList.UpdateIngredient(ingredient2);

            var ingredientList = positionList.GetIngredientList(ingredient2.Size);

            Assert.AreEqual(ingredient2, ingredientList[1]);
        }