browser_language_override.js

Enable keyboard shortcuts

/* 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";

const PAGE_URL = "https://example.com/chrome/dom/base/test/file_empty.html";

const languages = ["en-US", "es-ES", "fr-FR"];

add_task(async function test_set_language_override() {

  const tab = BrowserTestUtils.addTab(gBrowser, PAGE_URL);

  const browser = gBrowser.getBrowserForTab(tab);

  await BrowserTestUtils.browserLoaded(browser);

  info("Get default language");

  const defaultLanguage = await getIntlLanguage(browser);

  const browsingContext = browser.browsingContext;

  const languageOverride = getLanguageToOverride(defaultLanguage);

  info("Set language override");

  browsingContext.languageOverride = languageOverride;

  await assertLanguageOverridden(browser, languageOverride);

  const secondLanguageOverride = getSecondLanguageToOverride(

    defaultLanguage,

    languageOverride

);

  info("Set language override again");

  browsingContext.languageOverride = secondLanguageOverride;

  await assertLanguageOverridden(browser, secondLanguageOverride);

  info("Reset language override");

  browsingContext.languageOverride = "";

  await assertLanguageIsNotOverridden(browser, defaultLanguage);

  BrowserTestUtils.removeTab(tab);

});

add_task(async function test_set_language_override_in_different_contexts() {

  const tab1 = BrowserTestUtils.addTab(gBrowser, PAGE_URL);

  const browser1 = gBrowser.getBrowserForTab(tab1);

  await BrowserTestUtils.browserLoaded(browser1);

  const tab2 = BrowserTestUtils.addTab(gBrowser, PAGE_URL);

  const browser2 = gBrowser.getBrowserForTab(tab2);

  await BrowserTestUtils.browserLoaded(browser2);

  info("Get default language in the first tab");

  const defaultLanguage1 = await getIntlLanguage(browser1);

  info("Get default language in the second tab");

  const defaultLanguage2 = await getIntlLanguage(browser2);

  const browsingContext1 = browser1.browsingContext;

  const languageOverride = getLanguageToOverride(defaultLanguage1);

  info("Set language override to the first tab");

  browsingContext1.languageOverride = languageOverride;

  await assertLanguageOverridden(browser1, languageOverride);

  info("Make sure that in the second tab language is not overridden");

  await assertLanguageIsNotOverridden(browser2, defaultLanguage2);

  info("Reset language override");

  browsingContext1.languageOverride = "";

  await assertLanguageIsNotOverridden(browser1, defaultLanguage1);

  BrowserTestUtils.removeTab(tab1);

  BrowserTestUtils.removeTab(tab2);

});

function getLanguageToOverride(defaultLanguage) {

  return languages.find(lang => lang !== defaultLanguage);

function getSecondLanguageToOverride(defaultLanguage, secondLanguage) {

  return languages.find(

    lang => lang !== defaultLanguage && lang !== secondLanguage

);

async function getIntlLanguage(browser) {

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

    return new Intl.DateTimeFormat().resolvedOptions().locale;

});

async function assertLanguageOverridden(browser, languageOverride) {

is(

    await getIntlLanguage(browser),

    languageOverride,

    "new Intl.DateTimeFormat().resolvedOptions().locale is overridden"

);

async function assertLanguageIsNotOverridden(browser, defaultLanguage) {

is(

    await getIntlLanguage(browser),

    defaultLanguage,

    "new Intl.DateTimeFormat().resolvedOptions().locale is not overridden"

);