browser_history_restore_session.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";

add_task(async function testRestoreSession() {

  info("Check history panel's restore previous session button");

  let win = await BrowserTestUtils.openNewBrowserWindow();

  CustomizableUI.addWidgetToArea(

    "history-panelmenu",

    CustomizableUI.AREA_FIXED_OVERFLOW_PANEL

);

  registerCleanupFunction(() => CustomizableUI.reset());

  // We need to make sure the history is cleared before starting the test

  await Sanitizer.sanitize(["history"]);

  await openHistoryPanel(win.document);

  let restorePrevSessionBtn = win.document.getElementById(

    "appMenu-restoreSession"

);

  Assert.ok(

    restorePrevSessionBtn.hidden,

    "Restore previous session button is not visible"

);

  await hideHistoryPanel(win.document);

  BrowserTestUtils.addTab(win.gBrowser, "about:mozilla");

  await BrowserTestUtils.closeWindow(win);

  win = await BrowserTestUtils.openNewBrowserWindow();

  let lastSession = ChromeUtils.importESModule(

    "resource:///modules/sessionstore/SessionStore.sys.mjs"

  )._LastSession;

  lastSession.setState(true);

  await openHistoryPanel(win.document);

  restorePrevSessionBtn = win.document.getElementById("appMenu-restoreSession");

  Assert.ok(

    !restorePrevSessionBtn.hidden,

    "Restore previous session button is visible"

);

  await hideHistoryPanel(win.document);

  await BrowserTestUtils.closeWindow(win);

});