public void NoFilterTest()
        {
            DateTime date1 = new DateTime(2011, 4, 12);

            CalendarDateDiff calendarDateDiff = new CalendarDateDiff();

            Assert.AreEqual(calendarDateDiff.Difference(date1, date1.AddHours(1)), new TimeSpan(1, 0, 0));
            Assert.AreEqual(calendarDateDiff.Difference(date1, date1.AddHours(-1)), new TimeSpan(-1, 0, 0));
        }         // NoFilterTest
        public void HourFilterTest()
        {
            DateTime date1 = new DateTime(2011, 9, 11, 18, 0, 0);
            DateTime date2 = new DateTime(2011, 9, 15, 9, 0, 0);

            CalendarDateDiff calendarDateDiff = new CalendarDateDiff();

            calendarDateDiff.WorkingHours.Add(new HourRange(8, 12));
            Assert.AreEqual(calendarDateDiff.Difference(date1, date2), new TimeSpan(74, 0, 0));
            Assert.AreEqual(calendarDateDiff.Difference(date2, date1), new TimeSpan(-74, 0, 0));
        }         // HourFilterTest
        public void DayHourFilterTest()
        {
            DateTime date1 = new DateTime(2011, 9, 11, 18, 0, 0);
            DateTime date2 = new DateTime(2011, 9, 15, 9, 0, 0);

            CalendarDateDiff calendarDateDiff = new CalendarDateDiff();

            calendarDateDiff.WorkingDayHours.Add(new DayHourRange(DayOfWeek.Monday, 8, 12));
            calendarDateDiff.WorkingDayHours.Add(new DayHourRange(DayOfWeek.Tuesday, 8, 16));
            Assert.AreEqual(calendarDateDiff.Difference(date1, date2), new TimeSpan(75, 0, 0));
            Assert.AreEqual(calendarDateDiff.Difference(date2, date1), new TimeSpan(-75, 0, 0));
        } // DayHourFilterTest
        public void EmptyDiffTest()
        {
            DateTime date = new DateTime(2011, 4, 12);

            CalendarDateDiff calendarDateDiff = new CalendarDateDiff();

            Assert.AreEqual(calendarDateDiff.Difference(date, date), TimeSpan.Zero);
        }         // EmptyDiffTest