gecko/toolkit/components/thumbnails/test/browser_thumbnails_bug726727.js

/* Any copyright is dedicated to the Public Domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

/**
 * These tests ensure that capturing a sites's thumbnail, saving it and
 * retrieving it from the cache works.
 */
function runTests() {
  // Create a tab that shows an error page.
  let tab = gBrowser.addTab("http://127.0.0.1:1/");
  let browser = tab.linkedBrowser;

  yield browser.addEventListener("DOMContentLoaded", function onLoad() {
    browser.removeEventListener("DOMContentLoaded", onLoad, false);
    executeSoon(next);
  }, false);

  ok(!gBrowserThumbnails._shouldCapture(browser), "we're not going to capture an error page");
}