private static void TestFullCalendar(ICalendar calendar)
        {
            var monday    = DateTime.Parse("2020-11-02");
            var tuesday   = DateTime.Parse("2020-11-03");
            var wednesday = DateTime.Parse("2020-11-04");
            var thursday  = DateTime.Parse("2020-11-05");
            var friday    = DateTime.Parse("2020-11-06");
            var saturday  = DateTime.Parse("2020-11-07");
            var sunday    = DateTime.Parse("2020-11-08");

            // Exercise and Assert
            Assert.IsTrue(calendar.GetDayInfo(monday).IsWorkingDay);
            Assert.IsTrue(calendar.GetDayInfo(tuesday).IsWorkingDay);
            Assert.IsTrue(calendar.GetDayInfo(wednesday).IsWorkingDay);
            Assert.IsTrue(calendar.GetDayInfo(thursday).IsWorkingDay);
            Assert.IsTrue(calendar.GetDayInfo(friday).IsWorkingDay);
            Assert.IsFalse(calendar.GetDayInfo(saturday).IsWorkingDay);
            Assert.IsFalse(calendar.GetDayInfo(sunday).IsWorkingDay);
        }