browser_browsing_context_discarded.js

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"use strict";

const TOPIC = "browsing-context-discarded";

async function observeDiscarded(browsingContexts, callback) {

  let discarded = [];

  let promise = BrowserUtils.promiseObserved(TOPIC, subject => {

    ok(BrowsingContext.isInstance(subject), "subject to be a BrowsingContext");

    discarded.push(subject);

    return browsingContexts.every(item => discarded.includes(item));

});

  await callback();

  await promise;

  return discarded;

add_task(async function toplevelForNewWindow() {

  let win = await BrowserTestUtils.openNewBrowserWindow();

  let browsingContext = win.gBrowser.selectedBrowser.browsingContext;

  await observeDiscarded([win.browsingContext, browsingContext], async () => {

    await BrowserTestUtils.closeWindow(win);

});

});

add_task(async function toplevelForNewTab() {

  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);

  let browsingContext = tab.linkedBrowser.browsingContext;

  let discarded = await observeDiscarded([browsingContext], () => {

    BrowserTestUtils.removeTab(tab);

});

ok(

    !discarded.includes(window.browsingContext),

    "no notification for the current window's chrome browsing context"

);

});

add_task(async function subframe() {

  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);

  let browsingContext = await SpecialPowers.spawn(tab.linkedBrowser, [], () => {

    let iframe = content.document.createElement("iframe");

    content.document.body.appendChild(iframe);

    iframe.contentWindow.location = "https://example.com/";

    return iframe.browsingContext;

});

  let discarded = await observeDiscarded([browsingContext], async () => {

    await SpecialPowers.spawn(tab.linkedBrowser, [], () => {

      let iframe = content.document.querySelector("iframe");

      iframe.remove();

});

});

ok(

    !discarded.includes(tab.browsingContext),

    "no notification for toplevel browsing context"

);

  BrowserTestUtils.removeTab(tab);

});