Converting Polymer's WebComponentsLoaded to an onReady future

samples/third_party/todomvc/test/listorder_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library todomvc.test.listorder_test;
 
-import 'dart:async';
 import 'dart:html';
 import 'package:polymer/polymer.dart';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import '../web/model.dart';
 
 /**
  * This test runs the TodoMVC app, adds a few elements, marks some as done, and
  * switches from back and forth between "Active" and "All". This will make some
  * nodes to be hidden and readded to the page.
  */
 main() {
   useHtmlConfiguration();
 
   final root = query('todo-app').shadowRoot;
 
-  setUp(() => new Future.delayed(Duration.ZERO));
+  setUp(() => Polymer.onReady);
 
   test('programmatically add items to model', () {
     appModel.todos.addAll([
       new Todo('one (unchecked)'),
       new Todo('two (checked)')..done = true,
       new Todo('three (unchecked)')
     ]);
     performMicrotaskCheckpoint();
     expect(root.queryAll('#todo-list li[is=todo-row]').length, 3);
 
@@ skipping 16 matching lines @@
     performMicrotaskCheckpoint();
     expect(root.queryAll('#todo-list li[is=todo-row]').length, 1);
   });
 
   test('navigate back to #/', () {
     windowLocation.hash = '#/';
     performMicrotaskCheckpoint();
     expect(root.queryAll('#todo-list li[is=todo-row]').length, 3);
   });
 }