The Tor Browser / file revision

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 "use strict";

 const kTestToolbarId = "test-empty-drag";

 // Attempting to drag an item to an empty container should work.

 add_task(function() {

   yield createToolbarWithPlacements(kTestToolbarId, []);

   yield startCustomizing();

   let downloadButton = document.getElementById("downloads-button");

   let customToolbar = document.getElementById(kTestToolbarId);

   simulateItemDrag(downloadButton, customToolbar);

   assertAreaPlacements(kTestToolbarId, ["downloads-button"]);

   ok(downloadButton.parentNode && downloadButton.parentNode.parentNode == customToolbar,

      "Button should really be in toolbar");

   yield endCustomizing();

   removeCustomToolbars();

 });

 add_task(function asyncCleanup() {

   yield endCustomizing();

   yield resetCustomization();

 });