browser_pageinfo_previewBrowser.js

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const Cm = Components.manager;

async function testPreviewBrowser(pageInfo) {

  await BrowserTestUtils.waitForEvent(pageInfo, "page-info-init");

  info("pageInfo initialized");

  let tree = pageInfo.document.getElementById("imagetree");

  Assert.ok(!!tree, "should have imagetree element");

  // i=0: <img>

  // i=1: <video>

  // i=2: <audio>

  for (let i = 0; i < 3; i++) {

    info("imagetree select " + i);

    tree.view.selection.select(i);

    tree.ensureRowIsVisible(i);

    tree.focus();

    info("Waiting for the page-info-mediapreview-load event");

    await BrowserTestUtils.waitForEvent(

      pageInfo,

      "page-info-mediapreview-load"

);

    info("preview load " + i);

    let mediaBrowser = pageInfo.document.getElementById("mediaBrowser");

    Assert.equal(

      mediaBrowser.browsingContext.currentRemoteType,

      "webIsolated=https://example.com",

      "Preview mediaBrowser is running in a webIsolated process"

);

    Assert.equal(

      gBrowser.selectedBrowser.browsingContext.group,

      mediaBrowser.browsingContext.group,

      "Preview browser is in the same group as the original page"

);

async function test() {

  waitForExplicitFinish();

  let url =

    "https://example.com/browser/browser/base/content/test/pageinfo/image.html";

  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);

  let loadPromise = BrowserTestUtils.browserLoaded(

    gBrowser.selectedBrowser,

    false,

url

);

  BrowserTestUtils.startLoadingURIString(gBrowser.selectedBrowser, url);

  await loadPromise;

  // Pass a dummy imageElement, if there isn't an imageElement, pageInfo.js

  // will do a preview, however this sometimes will cause intermittent failures,

  // see bug 1403365.

  let pageInfo = BrowserCommands.pageInfo(url, "mediaTab", {});

  info("waitForEvent pageInfo");

  await BrowserTestUtils.waitForEvent(pageInfo, "load");

  info("calling testPreviewBrowser");

  await testPreviewBrowser(pageInfo);

  pageInfo.close();

  gBrowser.removeCurrentTab();

  finish();