public void EnumerateTradingDays()
        {
            var tradingCalendar = new TradingCalendar(Guid.NewGuid());

            var nonTradingDays = new NonTradingDay[] {
                new NonTradingDay(new Date(2019, 01, 01), "New Years Day"),
                new NonTradingDay(new Date(2019, 12, 25), "Christmas Day")
            };

            tradingCalendar.SetNonTradingDays(2019, nonTradingDays);

            var tradingDays = tradingCalendar.TradingDays(new DateRange(new Date(2019, 01, 01), new Date(2019, 01, 10))).ToList();

            tradingDays.Should().HaveCount(7).And.BeInAscendingOrder().And.OnlyHaveUniqueItems();
        }