public void WeekTest()
{
DurationUtil.Week.Should().Be(TimeSpan.FromDays(TimeSpec.DaysPerWeek));
DurationUtil.Weeks(0).Should().Be(TimeSpan.Zero);
DurationUtil.Weeks(1).Should().Be(TimeSpan.FromDays(TimeSpec.DaysPerWeek));
DurationUtil.Weeks(2).Should().Be(TimeSpan.FromDays(TimeSpec.DaysPerWeek * 2));
DurationUtil.Weeks(-1).Should().Be(TimeSpan.FromDays(TimeSpec.DaysPerWeek * -1));
DurationUtil.Weeks(-2).Should().Be(TimeSpan.FromDays(TimeSpec.DaysPerWeek * -2));
}