public void testReturnWorkdaysWhenStartIsWeekendSubtractingDays() {
String startDate = "2013/10/06";
int days = -1;
String expectedWorkDay = "2013/10/04";
StringEval stringEval = new StringEval(startDate);
double numberValue = ((NumberEval) WorkdayFunction.instance.evaluate(new ValueEval[]{
stringEval, new NumberEval(days) }, EC)).getNumberValue();
assertEquals(expectedWorkDay, formatter.format(DateUtil.getJavaDate(numberValue)));
}