live.test.mjs RawHistoryFolder

1// Tests of the "live updates paused" delay of static/js/ermite.js
2// (window.ermiteLive.lost/back) with mocked timers. Only the ermiteLive part of
3// the file is evaluated: the rest needs a page. Run with
4//   node --test 'internal/adapters/web/jstest/*.test.mjs'
5import assert from 'node:assert/strict';
6import { readFileSync } from 'node:fs';
7import { test } from 'node:test';
8
9const src = readFileSync(new URL('../static/js/ermite.js', import.meta.url), 'utf8');
10const live = src.slice(src.indexOf('window.ermiteLive = '));
11
12function setup(t) {
13  t.mock.timers.enable({ apis: ['setTimeout'] });
14  const hint = { dataset: { state: 'connecting' } };
15  globalThis.window = {};
16  globalThis.document = { querySelector: (sel) => (sel === '.hint-live' ? hint : null) };
17  new Function(live)();
18  return { live: globalThis.window.ermiteLive, hint };
19}
20
21test('a drop shorter than the delay says nothing', (t) => {
22  const { live, hint } = setup(t);
23  live.back();
24  live.lost();
25  t.mock.timers.tick(4000);
26  live.back();
27  t.mock.timers.tick(10000);
28  assert.equal(hint.dataset.state, 'live');
29});
30
31test('a drop that lasts shows offline, once, until the stream is back', (t) => {
32  const { live, hint } = setup(t);
33  live.lost();
34  t.mock.timers.tick(3000);
35  live.lost(); // a second error does not restart the delay
36  t.mock.timers.tick(2000);
37  assert.equal(hint.dataset.state, 'offline');
38  live.back();
39  assert.equal(hint.dataset.state, 'live');
40});