Merge Phase 6 and reconcile offline completion, response capture and contract tests

frontend/lazy.test.js

@@ -2,16 +2,16 @@ const { test } = require('node:test');
 const assert = require('node:assert/strict');
 const { readFileSync } = require('node:fs');
 const vm = require('node:vm');
-function fixture(current, held = []) {
-  const inserted = [], listeners = {}, writes = [];
-  const manifest = { buildTag: 'own', groups: { core: { files: [] }, 'layout:classic': { files: ['/classic.css'] }, 'layout:glass-stage': { files: ['/glass.css', '/one.js', '/two.js'] }, 'feature:test': { contract:1, files: ['/one.js', '/two.js'] } }, files: { '/classic.css': {h:'c'}, '/glass.css':{h:'g'}, '/one.js':{h:'1'}, '/two.js':{h:'2'} } };
+function fixture(current, held = [], appCache = false, userAgent = 'AppleWebKit/605.1 Safari/605.1', controlled = false) {
+  const inserted = [], listeners = {}, writes = [], fetched = [];
+  const manifest = { buildTag: 'own', appCache, groups: { core: { files: [] }, 'layout:classic': { files: ['/classic.css'] }, 'layout:glass-stage': { files: ['/glass.css', '/one.js', '/two.js'] }, 'feature:test': { contract:1, files: ['/one.js', '/two.js'] } }, files: { '/app.js':{h:'a'}, '/classic.css': {h:'c'}, '/glass.css':{h:'g'}, '/one.js':{h:'1'}, '/two.js':{h:'2'} } };
   const doc = { readyState:'loading', documentElement: { dataset:{} }, getElementById: () => ({ textContent:JSON.stringify(manifest) }), querySelectorAll: () => [], createElement: tag => ({ tagName:tag.toUpperCase() }), write: value => writes.push(value), addEventListener: (t,f) => listeners[t]=f };
   doc.head = { append: node => { inserted.push(node); queueMicrotask(() => node.onload?.()); } };
-  const root = { document:doc, localStorage:{ getItem:() => '{"settings":{"layout":"glass-stage"}}' }, console, Promise, URL, setTimeout, clearTimeout, navigator:{}, addEventListener(){} };
+  const root = { document:doc, localStorage:{ getItem:() => '{"settings":{"layout":"glass-stage"}}' }, console, Promise, URL, crypto:{subtle:{}}, fetch:async key=>{fetched.push(key);return new Response('app');}, setTimeout, clearTimeout, navigator:{userAgent,serviceWorker:{ready:Promise.resolve({}),controller:controlled?{}:null,addEventListener(){}}}, addEventListener(){} };
   if (current) root.caches = { open: async () => ({ match: async key => key === '/__ytp_asset_state' ? new Response(JSON.stringify({current})) : held.includes(key) ? new Response('', {headers:{'X-Asset-Hash':key.split('=')[1]}}) : undefined }) };
   root.window=root; root.globalThis=root;
   vm.runInNewContext(readFileSync(require.resolve('./lazy.js'),'utf8'), root);
-  return { root, inserted, writes, listeners, manifest };
+  return { root, inserted, writes, listeners, manifest, fetched };
 }
 test('external head bootstrap selects remembered CSS before paint without fetching a manifest', () => {
   const {root,writes}=fixture();
@@ -95,3 +95,31 @@ test('online launches request worker completion even with Save-Data and skip off
  assert.deepEqual(sent.map(m=>m.type),['COMPLETE_ASSETS','COMPLETE_ASSETS']);
  f.root.navigator.onLine=false;f.root.Lazy.warm();await Promise.resolve();assert.equal(sent.length,2);
 });
+test('server-enabled head capture owns exactly one app response; native and rollback do not fetch',async()=>{
+ const modern=fixture(null,[],true);await modern.root.Lazy.appResponse;
+ assert.deepEqual(modern.fetched,['/app.js?v=a']);
+ const legacy=fixture();assert.deepEqual(legacy.fetched,[]);assert.equal(legacy.root.Lazy.appResponse,undefined);
+});
+
+
+test('head capture is cache-first even before a worker controls the page',async()=>{
+ const f=fixture(fixture().manifest,['/app.js?v=a'],true);const response=await f.root.Lazy.appResponse;
+ assert.equal(response.headers.get('X-Asset-Hash'),'a');assert.deepEqual(f.fetched,[]);
+});
+
+
+test('Chromium retains native script loading and only preloads the current app URL',async()=>{
+ const f=fixture(null,[],true,'AppleWebKit/537.36 Chrome/140.0 Safari/537.36');
+ assert.equal(f.root.Lazy.captureApp,false);assert.equal(f.root.Lazy.appResponse,undefined);assert.deepEqual(f.fetched,[]);
+ assert.equal(f.inserted.length,1);assert.equal(f.inserted[0].rel,'preload');assert.equal(f.inserted[0].as,'script');assert.equal(f.inserted[0].href,'/app.js?v=a');assert.equal(f.inserted[0].fetchPriority,'low');
+});
+test('iOS Chromium-branded browsers still use their WebKit response capture',async()=>{
+ const f=fixture(null,[],true,'AppleWebKit/605.1 CriOS/140.0 Mobile Safari/605.1');await f.root.Lazy.appResponse;
+ assert.equal(f.root.Lazy.captureApp,true);assert.deepEqual(f.fetched,['/app.js?v=a']);
+});
+
+test('controlled WebKit visits use worker-cached native app scripts without a response handoff',async()=>{
+ const f=fixture(null,[],true,'AppleWebKit/605.1 Safari/605.1',true);
+ assert.equal(f.root.Lazy.captureApp,false);assert.equal(f.root.Lazy.appResponse,undefined);assert.deepEqual(f.fetched,[]);
+ assert.equal(f.inserted[0].as,'script');assert.equal(f.inserted[0].href,'/app.js?v=a');assert.equal(f.inserted[0].fetchPriority,'low');
+});