browser_browsing_context_active_change.js

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"use strict";

// Test browsing-context-active-change notification which is fired on the parent process

// to know when a BrowsingContext becomes visible/hidden.

function observeTopic(aTopic) {

  return new Promise(resolve => {

    function observer(subject, topic) {

      is(topic, aTopic, "observing correct topic");

ok(

        BrowsingContext.isInstance(subject),

        "subject to be a BrowsingContext"

);

      Services.obs.removeObserver(observer, aTopic);

      resolve();

    Services.obs.addObserver(observer, aTopic);

});

function waitForActiveChange() {

  return observeTopic("browsing-context-active-change");

function waitForAttached() {

  return observeTopic("browsing-context-attached");

add_task(async function () {

  const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);

  const browser = tab.linkedBrowser;

  let onActiveChange = waitForActiveChange();

  browser.docShellIsActive = false;

  await onActiveChange;

is(

    browser.browsingContext.isActive,

    false,

    "The browsing context is no longer active"

);

  onActiveChange = waitForActiveChange();

  browser.docShellIsActive = true;

  await onActiveChange;

is(

    browser.browsingContext.isActive,

    true,

    "The browsing context is active again"

);

  BrowserTestUtils.removeTab(tab);

});

// Tests that BrowsingContext.isActive becomes false in BF cache.

add_task(async function () {

  const TEST_PATH1 =

    getRootDirectory(gTestPath).replace(

      "chrome://mochitests/content",

      // eslint-disable-next-line @microsoft/sdl/no-insecure-url

      "http://example.com"

    ) + "dummy_page.html";

  const TEST_PATH2 =

    getRootDirectory(gTestPath).replace(

      "chrome://mochitests/content",

      // eslint-disable-next-line @microsoft/sdl/no-insecure-url

      "http://example.com"

    ) + "dummy_iframe_page.html";

  let attached = waitForActiveChange();

  const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PATH1);

  await attached;

  const firstBC = tab.linkedBrowser.browsingContext;

  is(firstBC.isActive, true, "The first browsing context is now active");

  is(firstBC.currentURI.spec, TEST_PATH1);

  // Load a new page now.

  let stoppedLoadingPromise = BrowserTestUtils.browserStopped(

    tab.linkedBrowser,

    TEST_PATH2

);

  await loadURI(TEST_PATH2);

  await stoppedLoadingPromise;

  const secondBC = tab.linkedBrowser.browsingContext;

  await TestUtils.waitForCondition(() => secondBC.isActive);

  isnot(firstBC, secondBC);

  is(secondBC.isActive, true, "The second browsing context is now active");

  is(secondBC.currentURI.spec, TEST_PATH2);

  is(firstBC.isActive, false, "The first browsing context is no longer active");

  is(firstBC.currentURI.spec, TEST_PATH1);

  // Now try to back to the previous page, unlike above cases we don't wait

  // "browsing-context-active-change" since it's not notified on this history back.

  stoppedLoadingPromise = BrowserTestUtils.browserStopped(

    tab.linkedBrowser,

    TEST_PATH1

);

  gBrowser.goBack();

  await stoppedLoadingPromise;

is(

    secondBC.isActive,

    false,

    "The second browsing context is no longer active"

);

  is(firstBC.isActive, true, "The first browsing context is active again");

  BrowserTestUtils.removeTab(tab);

});