public static MonthsWindows months(int number) {
    return new MonthsWindows(number, 1, DEFAULT_START_DATE, DateTimeZone.UTC);
  }
@Test
  public void testMonthsCompatibility() throws IncompatibleWindowException {
    CalendarWindows.MonthsWindows monthsWindows = CalendarWindows.months(10).beginningOnDay(15);
    monthsWindows.verifyCompatibility(CalendarWindows.months(10).beginningOnDay(15));
    thrown.expect(IncompatibleWindowException.class);
    monthsWindows.verifyCompatibility(CalendarWindows.months(10).beginningOnDay(30));
  }