import { isValidMonthDay, tskReferenceDayOf } from './tsk-day';

describe('isValidMonthDay', () => {
  it.each(['02-30', '02-29', '1-1', '13-01', '00-10', 'ab-cd', '01-32', ''])(
    'rejects %s',
    (value) => {
      expect(isValidMonthDay(value)).toBe(false);
    },
  );

  it.each(['01-01', '12-31', '02-28', '04-30'])('accepts %s', (value) => {
    expect(isValidMonthDay(value)).toBe(true);
  });
});

describe('tskReferenceDayOf', () => {
  it('joins year and month-day into a day', () => {
    expect(tskReferenceDayOf(2027, '01-01')).toBe('2027-01-01');
    expect(tskReferenceDayOf(2028, '12-31')).toBe('2028-12-31');
  });

  it('rejects an invalid month-day', () => {
    expect(() => tskReferenceDayOf(2027, '02-29')).toThrow();
  });
});