Turn on Polymer TodoMVC tests on Dart buildbots

samples/third_party/todomvc/test/markdone_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.markdone_test;
+
+import 'dart:html';
+import 'package:polymer/polymer.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import '../web/model.dart';
+
+Node findWithText(Node node, String text) {
+  if (node.text == text) return node;
+  if (node is Element && (node as Element).localName == 'polymer-element') {
+    return null;
+  }
+  if (node is Element && (node as Element).shadowRoot != null) {
+    var r = findWithText((node as Element).shadowRoot, text);
+    if (r != null) return r;
+  }
+  for (var n in node.nodes) {
+    var r = findWithText(n, text);
+    if (r != null) return r;
+  }
+  return null;
+}
+
+Node findShadowHost(Node node, ShadowRoot root) {
+  if (node is Element) {
+    var shadowRoot = (node as Element).shadowRoot;
+    if (shadowRoot == root) return node;
+    if (shadowRoot != null) {
+      var r = findShadowHost(shadowRoot, root);
+      if (r != null) return r;
+    }
+  }
+  for (var n in node.nodes) {
+    var r = findShadowHost(n, root);
+    if (r != null) return r;
+  }
+  return null;
+}
+
+/**
+ * This test runs the TodoMVC app, adds a few todos, marks some as done
+ * programatically, and clicks on a checkbox to mark others via the UI.
+ */
+main() {
+  useHtmlConfiguration();
+
+  test('mark done', () {
+    appModel.todos.add(new Todo('one (unchecked)'));
+    appModel.todos.add(new Todo('two (unchecked)'));
+    appModel.todos.add(new Todo('three (checked)')..done = true);
+    appModel.todos.add(new Todo('four (checked)'));
+
+    performMicrotaskCheckpoint();
+    var body = query('body');
+
+    var label = findWithText(body, 'four (checked)');
+    expect(label is LabelElement, isTrue, reason: 'text is in a label');
+
+    var host = findShadowHost(body, label.parentNode);
+    var node = host.parent.query('input');
+    expect(node is InputElement, isTrue, reason: 'node is a checkbox');
+    expect(node.type, 'checkbox', reason: 'node type is checkbox');
+    expect(node.checked, isFalse, reason: 'element is unchecked');
+
+    node.dispatchEvent(new MouseEvent('click', detail: 1));
+    expect(node.checked, isTrue, reason: 'element is checked');
+  });
+}