public void GetPropertyGroupSum_4筆一組_取Revenue總和Test()
        {
            //arrange
            var size = 4;
            var property = ProductProperty.Revenue;

            var stubDataDao = Substitute.For<IProductDataDao>();
            stubDataDao.GetProducts().Returns(_products);
            var target = new ProductService(stubDataDao);
            var excepted = new int[] { 50, 66, 60 };

            //act
            var actual = target.GetPropertyGroupSum(property, size);

            //assert
            excepted.ToExpectedObject().ShouldEqual(actual);
        }