public void HalfyearTest()
{
DateTime now = ClockProxy.Clock.Now;
DateTime halfyear = Now.Halfyear((YearMonth)now.Month);
Assert.Equal(halfyear.Year, now.Year);
Assert.Equal(halfyear.Month, now.Month);
Assert.Equal(1, halfyear.Day);
Assert.Equal(0, halfyear.Hour);
Assert.Equal(0, halfyear.Minute);
Assert.Equal(0, halfyear.Second);
Assert.Equal(0, halfyear.Millisecond);
int testYear;
YearMonth previousMonth;
TimeTool.PreviousMonth((YearMonth)now.Month, out testYear, out previousMonth);
DateTime previousHalfyear = Now.Halfyear(previousMonth);
Assert.Equal(previousHalfyear.Year, now.AddMonths(-1).Year);
Assert.Equal(previousHalfyear.Month, now.AddMonths(-1).Month);
Assert.Equal(1, previousHalfyear.Day);
Assert.Equal(0, previousHalfyear.Hour);
Assert.Equal(0, previousHalfyear.Minute);
Assert.Equal(0, previousHalfyear.Second);
Assert.Equal(0, previousHalfyear.Millisecond);
} // HalfyearTest