import { BadRequestException } from '@nestjs/common';
import { shanghaiDateRange } from './shanghai-date-range';

describe('shanghaiDateRange', () => {
  it('builds an inclusive Asia/Shanghai day range', () => {
    expect(shanghaiDateRange('2026-08-01', '2026-08-03')).toEqual({
      gte: new Date('2026-08-01T00:00:00+08:00'),
      lte: new Date('2026-08-03T23:59:59.999+08:00'),
    });
  });

  it('rejects malformed or reversed ranges', () => {
    expect(() => shanghaiDateRange('2026/08/01', undefined)).toThrow(BadRequestException);
    expect(() => shanghaiDateRange('2026-02-31', undefined)).toThrow('日期无效');
    expect(() => shanghaiDateRange('2026-08-03', '2026-08-01')).toThrow('开始日期不能晚于结束日期');
  });
});