fune/browser/base/content/test/plugins/browser_CTP_hide_overlay.js

var rootDir = getRootDirectory(gTestPath);
const gTestRoot = rootDir;
const gHttpTestRoot = rootDir.replace("chrome://mochitests/content/", "http://127.0.0.1:8888/");

var gTestBrowser = null;
var gNextTest = null;
var gPluginHost = Components.classes["@mozilla.org/plugin/host;1"].getService(Components.interfaces.nsIPluginHost);

Components.utils.import("resource://gre/modules/Services.jsm");

function test() {
  waitForExplicitFinish();
  registerCleanupFunction(function() {
    clearAllPluginPermissions();
    Services.prefs.clearUserPref("extensions.blocklist.suppressUI");
  });
  Services.prefs.setBoolPref("extensions.blocklist.suppressUI", true);

  let newTab = gBrowser.addTab();
  gBrowser.selectedTab = newTab;
  gTestBrowser = gBrowser.selectedBrowser;
  gTestBrowser.addEventListener("load", pageLoad, true);

  Services.prefs.setBoolPref("plugins.click_to_play", true);
  setTestPluginEnabledState(Ci.nsIPluginTag.STATE_DISABLED);

  prepareTest(runAfterPluginBindingAttached(test1), gHttpTestRoot + "plugin_test.html");
}

function finishTest() {
  clearAllPluginPermissions();
  gTestBrowser.removeEventListener("load", pageLoad, true);
  gBrowser.removeCurrentTab();
  window.focus();
  finish();
}

function pageLoad() {
  // The plugin events are async dispatched and can come after the load event
  // This just allows the events to fire before we then go on to test the states
  executeSoon(gNextTest);
}

function prepareTest(nextTest, url) {
  gNextTest = nextTest;
  gTestBrowser.contentWindow.location = url;
}

// Due to layout being async, "PluginBindAttached" may trigger later.
// This wraps a function to force a layout flush, thus triggering it,
// and schedules the function execution so they're definitely executed
// afterwards.
function runAfterPluginBindingAttached(func) {
  return function() {
    let doc = gTestBrowser.contentDocument;
    let elems = doc.getElementsByTagName('embed');
    if (elems.length < 1) {
      elems = doc.getElementsByTagName('object');
    }
    elems[0].clientTop;
    executeSoon(func);
  };
}

// Tests that the overlay can be hidded for disabled plugins using the close icon.
function test1() {
  var doc = gTestBrowser.contentDocument;
  var plugin = doc.getElementById("test");
  ok(plugin, "Test 1, Found plugin in page");
  var overlay = doc.getAnonymousElementByAttribute(plugin, "anonid", "main");
  ok(overlay.classList.contains("visible"), "Test 1, Plugin overlay should exist, not be hidden");
  var closeIcon = doc.getAnonymousElementByAttribute(plugin, "anonid", "closeIcon")
  EventUtils.synthesizeMouseAtCenter(closeIcon, {}, gTestBrowser.contentWindow);
  var condition = function() !overlay.classList.contains("visible");
  waitForCondition(condition, finishTest, "Test 1, Waited too long for the overlay to become invisible.");
}