fune/browser/components/sessionstore/test/browser_page_title.js

"use strict";

const URL = "data:text/html,<title>initial title</title>";

add_task(async function () {
  // Create a new tab.
  let tab = BrowserTestUtils.addTab(gBrowser, URL);
  await promiseBrowserLoaded(tab.linkedBrowser);

  // Remove the tab.
  await promiseRemoveTabAndSessionState(tab);

  // Check the title.
  let [
    {
      state: { entries },
    },
  ] = ss.getClosedTabDataForWindow(window);
  is(entries[0].title, "initial title", "correct title");
});

add_task(async function () {
  // Create a new tab.
  let tab = BrowserTestUtils.addTab(gBrowser, URL);
  let browser = tab.linkedBrowser;
  await promiseBrowserLoaded(browser);

  // Flush to ensure we collected the initial title.
  await TabStateFlusher.flush(browser);

  // Set a new title.
  await SpecialPowers.spawn(browser, [], async function () {
    return new Promise(resolve => {
      docShell.chromeEventHandler.addEventListener(
        "DOMTitleChanged",
        () => resolve(),
        { once: true }
      );

      content.document.title = "new title";
    });
  });

  // Remove the tab.
  await promiseRemoveTabAndSessionState(tab);

  // Check the title.
  let [
    {
      state: { entries },
    },
  ] = ss.getClosedTabDataForWindow(window);
  is(entries[0].title, "new title", "correct title");
});