test_sharedMap_static_prefs.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

// Tests that static preferences in the content process

// correctly handle values which are different from their

// statically-defined defaults.

//

// Since we can't access static preference values from JS, this tests relies on

// assertions in debug builds to detect mismatches. The default and user

// values of two preferences are changed (respectively) before a content

// process is started. Once the content process is launched, the

// preference service asserts that the values stored in all static prefs

// match their current values as known to the preference service. If

// there's a mismatch, the shell will crash, and the test will fail.

//

// For sanity, we also check that the dynamically retrieved preference

// values in the content process match our expectations, though this is

// not strictly part of the test.

const PREF1_NAME = "dom.webcomponents.shadowdom.report_usage";

const PREF1_VALUE = false;

const PREF2_NAME = "dom.mutation-events.cssom.disabled";

const PREF2_VALUE = true;

const { XPCShellContentUtils } = ChromeUtils.importESModule(

  "resource://testing-common/XPCShellContentUtils.sys.mjs"

);

XPCShellContentUtils.init(this);

const { prefs } = Services;

const defaultPrefs = prefs.getDefaultBranch("");

add_task(async function test_sharedMap_static_prefs() {

  equal(

    prefs.getBoolPref(PREF1_NAME),

    PREF1_VALUE,

    `Expected initial value for ${PREF1_NAME}`

);

  equal(

    prefs.getBoolPref(PREF2_NAME),

    PREF2_VALUE,

    `Expected initial value for ${PREF2_NAME}`

);

  defaultPrefs.setBoolPref(PREF1_NAME, !PREF1_VALUE);

  prefs.setBoolPref(PREF2_NAME, !PREF2_VALUE);

  equal(

    prefs.getBoolPref(PREF1_NAME),

    !PREF1_VALUE,

    `Expected updated value for ${PREF1_NAME}`

);

  equal(

    prefs.getBoolPref(PREF2_NAME),

    !PREF2_VALUE,

    `Expected updated value for ${PREF2_NAME}`

);

  let contentPage = await XPCShellContentUtils.loadContentPage("about:blank", {

    remote: true,

});

  registerCleanupFunction(() => contentPage.close());

  /* eslint-disable no-shadow */

  let values = await contentPage.spawn([[PREF1_NAME, PREF2_NAME]], prefs => {

    return prefs.map(pref => Services.prefs.getBoolPref(pref));

});

  /* eslint-enable no-shadow */

  equal(values[0], !PREF1_VALUE, `Expected content value for ${PREF1_NAME}`);

  equal(values[1], !PREF2_VALUE, `Expected content value for ${PREF2_NAME}`);

});