public void GetOpenTimesForDayOfWeek()
        {
            var am9    = TimeSpan.Parse("09:00");
            var pm5    = TimeSpan.Parse("17:00");
            var am8    = TimeSpan.Parse("08:00");
            var pm1230 = TimeSpan.Parse("12:30");

            var mondayOpenTimes = testPeriod1.GetOpenTimesForDayOfWeek(DayOfWeek.Monday);

            Assert.Single(mondayOpenTimes);
            Assert.Equal(am9, TimeSpan.Parse(mondayOpenTimes[0].Start));
            Assert.Equal(pm5, TimeSpan.Parse(mondayOpenTimes[0].End));

            var tuesdayOpenTimes = testPeriod1.GetOpenTimesForDayOfWeek(DayOfWeek.Tuesday);

            Assert.Single(tuesdayOpenTimes);
            Assert.Equal(am8, TimeSpan.Parse(tuesdayOpenTimes[0].Start));
            Assert.Equal(pm1230, TimeSpan.Parse(tuesdayOpenTimes[0].End));

            var wednesdayOpenTimes = testPeriod1.GetOpenTimesForDayOfWeek(DayOfWeek.Wednesday);

            Assert.Empty(wednesdayOpenTimes);
        }