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

chrome/test/data/webui/md_bookmarks/item_test.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.
 
 suite('<bookmarks-item>', function() {
   var item;
+  var store;
   var TEST_ITEM = createItem('0');
 
   setup(function() {
+    store = new bookmarks.TestStore({
+      nodes: {
+        '0': createItem('0'),
+      },
+    });
+    bookmarks.Store.instance_ = store;
+
     item = document.createElement('bookmarks-item');
+    item.itemId = '0';
     replaceBody(item);
-    item.item = TEST_ITEM;
   });
 
   test('changing the url changes the favicon', function() {
     var favicon = item.$.icon.style.backgroundImage;
-    item.set('item.url', 'http://www.mail.google.com');
+    store.data.nodes['0'] = createItem('0', {url: 'https://mail.google.com'});
+    store.notifyObservers();
     assertNotEquals(favicon, item.$.icon.style.backgroundImage);
   });
 
-  test('changing isFolder_ hides/unhides the folder/icon', function() {
-    item.isFolder_ = true;
+  test('changing to folder hides/unhides the folder/icon', function() {
+    // Starts test as an item.
+    assertTrue(item.$['folder-icon'].hidden);
+    assertFalse(item.$.icon.hidden);
+
+    // Change to a folder.
+    store.data.nodes['0'] = createFolder('0', []);
+    store.notifyObservers();
+
     assertFalse(item.$['folder-icon'].hidden);
     assertTrue(item.$.icon.hidden);
-
-    item.isFolder_ = false;
-    assertTrue(item.$['folder-icon'].hidden);
-    assertFalse(item.$.icon.hidden);
-  });
-
-  test('pressing the buttons fires the right event', function() {
-    var counter = [0, 0, 0];
-    document.addEventListener('select-item', function(e) {
-      if (e.detail.range)
-        counter[0]++;
-      else if (e.detail.add)
-        counter[1]++;
-      else
-        counter[2]++;
-    });
-
-    customClick(item);
-    assertDeepEquals([0, 0, 1], counter);
-
-    customClick(item, {shiftKey: true});
-    assertDeepEquals([1, 0, 1], counter);
-
-    customClick(item, {ctrlKey: true});
-    assertDeepEquals([1, 1, 1], counter);
-
-    customClick(item, {shiftKey: true, ctrlKey: true});
-    assertDeepEquals([2, 1, 1], counter);
   });
 });