public void CalendarDataSource_GetDays_With_1Month_Returns31()
        {
            var data  = new CalendarDataSource();
            var start = new DateTime(2019, 1, 1);

            var days = data.GetDays(start, 1);

            Assert.AreEqual(31, days.Count());
        }
        public void CalendarDataSource_GetDays_WithStartAndEnd_Returns31()
        {
            var data  = new CalendarDataSource();
            var start = new DateTime(2019, 1, 1);
            var end   = start.AddMonths(1).AddDays(-1);

            var days = data.GetDays(start, end);

            Assert.AreEqual(31, days.Count());
        }