/**
* dateUtils.test.ts
* Tests for date calculation utilities
*/
import { getWeekStart } from './dateUtils.js';
describe('getWeekStart', () => {
// Wednesday, January 17, 2024 at noon
const FIXED_DATE = new Date('2024-01-17T12:00:00Z');
beforeEach(() => {
jest.useFakeTimers();
jest.setSystemTime(FIXED_DATE);
});
afterEach(() => {
jest.useRealTimers();
});
describe('week start behavior', () => {
it('returns a date at the beginning of the day (midnight)', () => {
const result = getWeekStart();
expect(result.getHours()).toBe(0);
expect(result.getMinutes()).toBe(0);
expect(result.getSeconds()).toBe(0);
});
it('returns a date in the past or today (never future)', () => {
const result = getWeekStart();
expect(result.getTime()).toBeLessThanOrEqual(FIXED_DATE.getTime());
});
it('returns a date within 7 days of the fixed date', () => {
const result = getWeekStart();
const daysDiff =
(FIXED_DATE.getTime() - result.getTime()) / (1000 * 60 * 60 * 24);
expect(daysDiff).toBeLessThan(7);
expect(daysDiff).toBeGreaterThanOrEqual(0);
});
});
});
