browser_onvisit_title_null_for_navigation.js

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const TEST_PATH = getRootDirectory(gTestPath).replace(

  "chrome://mochitests/content",

  "http://example.com"

);

add_task(async function checkTitleNotificationForNavigation() {

  const EXPECTED_URL = Services.io.newURI(TEST_PATH + "empty_page.html");

  const promiseVisit = PlacesTestUtils.waitForNotification(

    "page-visited",

    events => events[0].url === EXPECTED_URL.spec

);

  const promiseTitle = PlacesTestUtils.waitForNotification(

    "page-title-changed",

    events => events[0].url === EXPECTED_URL.spec

);

  let tab = await BrowserTestUtils.openNewForegroundTab(

    gBrowser,

    EXPECTED_URL.spec

);

  const visitEvents = await promiseVisit;

  Assert.equal(visitEvents.length, 1, "Right number of visits notified");

  Assert.equal(visitEvents[0].type, "page-visited");

  info("'page-visited': " + visitEvents[0].url);

  Assert.equal(visitEvents[0].lastKnownTitle, null, "Should not have a title");

  const titleEvents = await promiseTitle;

  Assert.equal(titleEvents.length, 1, "Right number of title changed notified");

  Assert.equal(titleEvents[0].type, "page-title-changed");

  info("'page-title-changed': " + titleEvents[0].url);

  Assert.equal(

    titleEvents[0].title,

    "I am an empty page",

    "Should have correct title in titlechanged notification"

);

  BrowserTestUtils.removeTab(tab);

});