90 lines
2.7 KiB
JavaScript
90 lines
2.7 KiB
JavaScript
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import { test } from 'node:test';
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import assert from 'node:assert/strict';
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import { createSessionLiveReloadCoordinator } from '../app/src/renderer/src/session-live-reload.mjs';
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test('live snapshots coalesce while scrolling and commit once after scroll end', async () => {
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let scrolling = true;
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let loads = 0;
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const commits = [];
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const coordinator = createSessionLiveReloadCoordinator({
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isScrolling: () => scrolling,
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load: async () => ++loads,
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commit: async snapshot => { commits.push(snapshot); },
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});
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await coordinator.request();
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await coordinator.request();
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await coordinator.request();
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assert.equal(loads, 0);
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assert.deepEqual(commits, []);
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scrolling = false;
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await coordinator.flush();
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assert.equal(loads, 1);
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assert.deepEqual(commits, [1]);
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await coordinator.flush();
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assert.equal(loads, 1, 'an idle flush without another update is a no-op');
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});
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test('an update arriving during an in-flight load skips the stale snapshot without overlap', async () => {
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let releaseFirstLoad;
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let activeLoads = 0;
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let maxActiveLoads = 0;
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let loads = 0;
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const commits = [];
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const firstLoadGate = new Promise(resolve => { releaseFirstLoad = resolve; });
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const coordinator = createSessionLiveReloadCoordinator({
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isScrolling: () => false,
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load: async () => {
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loads++;
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activeLoads++;
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maxActiveLoads = Math.max(maxActiveLoads, activeLoads);
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if (loads === 1) await firstLoadGate;
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activeLoads--;
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return loads;
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},
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commit: async snapshot => { commits.push(snapshot); },
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});
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const first = coordinator.request();
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const second = coordinator.request();
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releaseFirstLoad();
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await Promise.all([first, second]);
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assert.equal(loads, 2);
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assert.equal(maxActiveLoads, 1, 'snapshot loads remain serialized');
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assert.deepEqual(commits, [2], 'only the freshest loaded snapshot is committed');
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});
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test('scrolling that starts during IPC defers the loaded snapshot commit', async () => {
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let scrolling = false;
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let releaseLoad;
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let loads = 0;
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const commits = [];
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const loadGate = new Promise(resolve => { releaseLoad = resolve; });
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const coordinator = createSessionLiveReloadCoordinator({
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isScrolling: () => scrolling,
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load: async () => {
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loads++;
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await loadGate;
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return 'loaded-before-scroll-ended';
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},
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commit: async snapshot => { commits.push(snapshot); },
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});
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const request = coordinator.request();
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scrolling = true;
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releaseLoad();
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await request;
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assert.equal(loads, 1);
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assert.deepEqual(commits, []);
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scrolling = false;
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await coordinator.flush();
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assert.equal(loads, 1, 'the already-loaded snapshot is reused');
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assert.deepEqual(commits, ['loaded-before-scroll-ended']);
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});
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