private void testGetDayDifferenceOfReadableIntsPlusMinusNDays(int sign) { Calendar calendar = Calendar.getInstance(); DateUtils.setTime(calendar, 12, 0, 0, 0); int today = DateUtils.getDayAsReadableInt(calendar); for (int i = 1; i <= 5000; i++) { DateUtils.addDays(calendar, sign * 1); int day = DateUtils.getDayAsReadableInt(calendar); int diff = DateUtils.getDayDifferenceOfReadableInts(today, day); Assert.assertEquals(sign * i, diff); } }