Take into account the eventual shift to the next MON if any holiday
        falls on SUN.

def get_calendar_holidays(self, year):
        """
        Take into account the eventual shift to the next MON if any holiday
        falls on SUN.
        """
        # Unshifted days are here:
        days = super(ChineseNewYearCalendar, self).get_calendar_holidays(year)
        if self.shift_sunday_holidays:
            days_to_inspect = copy(days)
            for day_shifted in self.get_shifted_holidays(days_to_inspect):
                days.append(day_shifted)
        return days