[MD Bookmarks] Test Util

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);
 }
+
+/**
+ * Generates the following properties for a tree for UI testing:

[tsergeant, 2017/01/08 23:39:29]

This is the sort of comment that's likely to get out of date, because you're
describing what happens inside other functions. If you need to change initNodes
in the future, you probably won't remember to come back here and update this
comment.

My suggestion would be:

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.

[jiaxi, 2017/01/09 00:04:11]

Done.

+ * - Stores the path to the node inside each node.
+ * - Sets all nodes to not selected and open by default.
+ * @param {BookmarkTreeNode} rootNode
+ */
+function setupTreeForUITests(rootNode){
+  if (!rootNode.path)
+    rootNode.path = 'rootNode';
+
+  BookmarksStore.generatePaths(rootNode, 0);
+  BookmarksStore.initNodes(rootNode);
+}
+
+/**
+ * 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;
+}
+
+/**
+ * Creates a bookmark with given properties.
+ * @param {string} id
+ * @param {Object=} config
+ * @return {BookmarkTreeNode}
+ */
+function createItem(id, config) {
+  var newItem = {
+    id: id,
+    title: '',
+    url: 'http://www.google.com/',
+  };
+  if (config) {
+    for (var key in config)
+      newItem[key] = config[key];
+  }
+  return newItem;
+}