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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /webmessaging/message-channels/close-event/entangled-after-back-forward-cache-restore.https.tentative.window.html - WPT Dashboard Interop Dashboard
// META: timeout=long
// META: title=Confirm close event is not fired when the page enters BFCache and MessagePort still works after the page is restored.
// META: script=/common/dispatcher/dispatcher.js
// META: script=/common/get-host-info.sub.js
// META: script=/common/utils.js
// META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
// META: script=/html/browsers/browsing-the-web/back-forward-cache/resources/rc-helper.js
promise_test(async t => {
// Register a service worker.
const scope =
'/html/browsers/browsing-the-web/remote-context-helper/resources'
const workerUrl =
`/html/browsers/browsing-the-web/back-forward-cache/resources/` +
`service-worker.js?pipe=header(Service-Worker-Allowed,${scope})`;
const registration =
await service_worker_unregister_and_register(t, workerUrl, scope);
t.add_cleanup(_ => registration.unregister());
await wait_for_state(t, registration.installing, 'activated');
// Open a window with noopener so that BFCache will work.
const rcHelper = new RemoteContextHelper();
const rc1 = await rcHelper.addWindow(
/*extraConfig=*/ null, /*options=*/ {features: 'noopener'});
// Confirm the page is controlled.
assert_true(
await rc1.executeScript(
() => (navigator.serviceWorker.controller !== null)),
'The page should be controlled before navigation');
// Send MessagePort to the service worker.
await rc1.executeScript(() => {
const {port1, port2} = new MessageChannel();
port1.start();
const ctrl = navigator.serviceWorker.controller;
ctrl.postMessage({type: 'storeMessagePort'}, [port2]);
self.waitForMessage = (sentMessage) => {
return new Promise(resolve => {
port1.addEventListener('message', (event) => {
resolve(event.data);
});
port1.postMessage(sentMessage);
});
};
});
// Verify that the page was BFCached.
await assertBFCacheEligibility(rc1, /*shouldRestoreFromBFCache=*/ true);
// Confirm MessagePort can still work after the page is restored from
// BFCache.
assert_equals(
await rc1.executeScript(
async () =>
await self.waitForMessage('Confirm the ports can communicate')),
'Receive message');
// Confirm the close event was not fired.
assert_false(await rc1.executeScript(
async () =>
await self.waitForMessage('Ask if the close event was fired')));
}, 'MessagePort still works after the page is restored from BFCache');