public async Task GetPageNumTest()
        {
            await Assert.ThrowsAsync <ArgumentException>(() => JdVopApi.GetPageNumAsync(null));

            var res = await ApiInstance.GetPageNumAsync();

            Assert.True(res.Success, res.ResultMessage);
            var pageNum = res.Result;

            Assert.NotNull(pageNum);
            Assert.NotEmpty(pageNum);
            Assert.DoesNotContain(pageNum, v => v.ContractSkuPoolExt != null);
            TestHelper.ProductPageNum = pageNum;
        }