public void TestTradingDayCache_GetOpenDate_GetOpenDateIndex()
        {
            CacheUtils_TradingDay cache = GetTradingDayCache();

            Assert.AreEqual(-1, cache.GetTradingDayIndex(20100101));
            Assert.AreEqual(1460, cache.GetTradingDayIndex(20100105));

            Assert.AreEqual(20040609, cache.GetTradingDay(100));

            Assert.AreEqual(-1, cache.GetTradingDay(20000101));
            Assert.AreEqual(-1, cache.GetTradingDay(20170101));
        }