public void GetHalfyearRangeTest()
{
var halfyearRange = TimeTool.GetHalfyearRange(startTime, TimeCalendar.NewEmptyOffset());
var start = startTime.StartTimeOfHalfyear();
halfyearRange.Start.Should().Be(start);
halfyearRange.End.Should().Be(halfyearRange.GetNextHalfyear().Start);
}