public void TimeList_GetSecondsList()
        {
            DateTime now = new DateTime(2000, 3, 3, 3, 3, 3);
            TimeList <Nullable <int> > list = new TimeList <Nullable <int> >(now);

            list.Add(11, now.AddSeconds(5));
            list.Add(22, now.AddSeconds(6));
            list.Add(33, now.AddSeconds(11));

            List <long> seconds = list.GetSecondsList(now.AddSeconds(17));

            Assert.AreEqual(seconds[0], 1);
            Assert.AreEqual(seconds[1], 5);
            Assert.AreEqual(seconds[2], 6);
        }