foodmageddon/tests/discovery.test.ts

import { describe, expect, it } from 'vitest';
import { DiscoveryListener } from '../src/main/discovery';
import { Announcer, broadcastAddresses } from '../src/server/discovery';
import { MAX_PLAYERS, PROTOCOL_VERSION } from '../src/shared/constants';
import { isAnnouncement, type Announcement } from '../src/shared/protocol';

const announcement: Announcement = {
  magic: 'goutermageddon',
  serverId: 'test-server',
  name: 'Goûter de test',
  mapId: 'gateau-etages',
  players: 2,
  maxPlayers: MAX_PLAYERS,
  phase: 'lobby',
  version: PROTOCOL_VERSION,
  port: 47100,
};

describe('LAN discovery', () => {
  it('validates announcements', () => {
    expect(isAnnouncement(announcement)).toBe(true);
    expect(isAnnouncement({ ...announcement, magic: 'other-game' })).toBe(false);
    expect(isAnnouncement({ ...announcement, phase: 'nope' })).toBe(false);
  });

  it('always announces on loopback and the limited broadcast', () => {
    expect(broadcastAddresses()).toEqual(expect.arrayContaining(['127.0.0.1', '255.255.255.255']));
  });

  it('a listener hears an announcer on the same machine, once, with its address', async () => {
    const listener = new DiscoveryListener();
    listener.start((err) => {
      throw err;
    });
    const announcer = new Announcer(() => announcement);
    announcer.start();
    await new Promise((r) => setTimeout(r, 400));
    // Other games may be running on this machine or the LAN: only look at ours.
    const games = listener.list().filter((g) => g.serverId === 'test-server');
    announcer.stop();
    listener.stop();
    expect(games).toHaveLength(1);
    expect(games[0]).toMatchObject({ serverId: 'test-server', name: 'Goûter de test', players: 2, port: 47100 });
    expect(games[0].address).toMatch(/^\d+\.\d+\.\d+\.\d+$/);
  });
});