export default function formatDateInTimeZone(date, timeZone) {
  throw new Error('Not implemented');
}

import formatDateInTimeZone from './formatDateInTimeZone';

describe('formatDateInTimeZone', () => {
  test('formats date in different time zones', () => {
    const date = new Date('2020-01-01T00:30:00Z');
    expect(formatDateInTimeZone(date, 'America/Los_Angeles')).toBe('2019-12-31');
    expect(formatDateInTimeZone(date, 'Asia/Tokyo')).toBe('2020-01-01');
  });

  test('accepts a timestamp', () => {
    const ts = Date.parse('2020-07-01T23:30:00Z');
    expect(formatDateInTimeZone(ts, 'UTC')).toBe('2020-07-01');
  });

  test('throws on invalid date', () => {
    expect(() => formatDateInTimeZone(new Date('invalid'), 'UTC')).toThrow();
  });
});