MD Bookmarks: Proof-of-concept reimplementation of data storage/binding layer

chrome/test/data/webui/md_bookmarks/test_util.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Replace the current body of the test with a new element.
  * @param {Element} element
  */
 function replaceBody(element) {
   PolymerTest.clearBody();
   document.body.appendChild(element);
 }
 
 /**
- * Initialize a tree for UI testing. This performs the same initialization as
- * `setUpStore_` in <bookmarks-store>, but without the need for a store element
- * in the test.
- * @param {BookmarkTreeNode} rootNode
+ * Convert a tree of bookmark nodes into a normalized lookup table of nodes.
  */
-function setupTreeForUITests(rootNode){
-  if (!rootNode.path)
-    rootNode.path = 'rootNode';
-
-  BookmarksStore.generatePaths(rootNode, 0);
-  BookmarksStore.initNodes(rootNode);
+function testTree(root) {
+  return bookmarks.util.normalizeNodes(root);
 }
 
 /**
  * Creates a folder with given properties.
  * @param {string} id
  * @param {Array<BookmarkTreeNode>} children
  * @param {Object=} config
  * @return {BookmarkTreeNode}
  */
 function createFolder(id, children, config) {
   var newFolder = {
     id: id,
     children: children,
     title: '',
   };
   if (config) {
     for (var key in config)
       newFolder[key] = config[key];
   }
   if (children.length) {
     for (var i = 0; i < children.length; i++) {
-      children[i].index = i;
       children[i].parentId = newFolder.id;
     }
   }
   return newFolder;
 }
 
 /**
  * Splices out the item/folder at |index| and adjusts the indices of all the
  * items after that.
  * @param {BookmarkTreeNode} tree
@@ skipping 41 matching lines @@
 
   if (config) {
     for (var key in config)
       props[key] = config[key];
   }
 
   element.dispatchEvent(new MouseEvent('mousedown', props));
   element.dispatchEvent(new MouseEvent('mouseup', props));
   element.dispatchEvent(new MouseEvent('click', props));
 }