private static FiscalMonth TweakBy(
this FiscalMonth fiscalMonth,
int amount,
FiscalMonthComponent componentToTweak)
{
if (componentToTweak == FiscalMonthComponent.Month)
{
var referenceMonth = new DateTime(fiscalMonth.Year, (int)fiscalMonth.MonthNumber, 1);
var updatedMonth = referenceMonth.AddMonths(amount);
var result = new FiscalMonth(updatedMonth.Year, (MonthNumber)updatedMonth.Month);
return(result);
}
if (componentToTweak == FiscalMonthComponent.Year)
{
var result = new FiscalMonth(fiscalMonth.Year + amount, fiscalMonth.MonthNumber);
return(result);
}
throw new NotSupportedException("this fiscal month component is not supported: " + componentToTweak);
}
private static FiscalMonth TweakComponentOfFiscalMonth(this FiscalMonth fiscalMonth, FiscalMonthComponent componentToTweak)
{
if (componentToTweak == FiscalMonthComponent.Month)
{
var tweakedMonth = A.Dummy <MonthNumber>().ThatIsNot(fiscalMonth.MonthNumber);
var result = new FiscalMonth(fiscalMonth.Year, tweakedMonth);
return(result);
}
if (componentToTweak == FiscalMonthComponent.Year)
{
var tweakedYear = A.Dummy <PositiveInteger>().ThatIs(y => y != fiscalMonth.Year && y <= 9999);
var result = new FiscalMonth(tweakedYear, fiscalMonth.MonthNumber);
return(result);
}
throw new NotSupportedException("this fiscal month component is not supported: " + componentToTweak);
}
