def _get_correct_leap_year(self, prefer_dates_from, current_year):
if prefer_dates_from == 'future':
return get_next_leap_year(current_year)
if prefer_dates_from == 'past':
return get_previous_leap_year(current_year)
# Default case ('current_period'): return closer leap year
next_leap_year = get_next_leap_year(current_year)
previous_leap_year = get_previous_leap_year(current_year)
next_leap_year_is_closer = next_leap_year - current_year < current_year - previous_leap_year
return next_leap_year if next_leap_year_is_closer else previous_leap_year
def test_get_previous_leap_year(year, expected_previous_leap_year):
assert get_previous_leap_year(year) == expected_previous_leap_year
