dorfteich/apps/backup/src/scheduler.test.ts

import { describe, expect, it } from 'vitest';

import { msUntilNext } from './scheduler.js';

// msUntilNext works in local time (the container's TZ); the tests build
// their expectations with local-time Dates, so they hold in any zone.
describe('msUntilNext', () => {
  it('targets today when the time is still ahead', () => {
    const now = new Date(2026, 6, 11, 1, 30, 0);
    expect(msUntilNext(now, '03:00')).toBe(90 * 60 * 1000);
  });

  it('targets tomorrow when the time has passed', () => {
    const now = new Date(2026, 6, 11, 3, 0, 1);
    expect(msUntilNext(now, '03:00')).toBe(24 * 60 * 60 * 1000 - 1000);
  });

  it('an exact hit schedules a full day ahead (never a zero delay)', () => {
    const now = new Date(2026, 6, 11, 3, 0, 0);
    expect(msUntilNext(now, '03:00')).toBe(24 * 60 * 60 * 1000);
  });
});