browser_hal_during_content_shutdown.js

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

const PAGE = "https://example.com/";

// A content process only creates its PHal actor lazily, e.g. when a top-level

// document becomes active. Use a background tab so that the first HAL call

// happens during XPCOM shutdown, after the PContent channel is gone.

add_task(async function test_first_hal_use_during_content_xpcom_shutdown() {

  await SpecialPowers.pushPrefEnv({

    set: [["dom.ipc.processPreload.enabled", false]],

});

  Services.ppmm.releaseCachedProcesses();

  let tab = BrowserTestUtils.addTab(gBrowser, PAGE, { forceNewProcess: true });

  let browser = tab.linkedBrowser;

  await BrowserTestUtils.browserLoaded(browser, { wantLoad: PAGE });

  Assert.notEqual(gBrowser.selectedTab, tab, "Tab stays in the background");

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

    Services.obs.addObserver(() => {

      Cc["@mozilla.org/power/powermanagerservice;1"].getService(

        Ci.nsIPowerManagerService

);

    }, "xpcom-shutdown");

});

  let remoteTab = browser.frameLoader.remoteTab;

  let destroyed = TestUtils.topicObserved(

    "ipc:browser-destroyed",

    subject => subject === remoteTab

);

  BrowserTestUtils.removeTab(tab);

  await destroyed;

});