Added test for two way bindings with strings, ints, and bools.

pkg/polymer/test/two_way_bind_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.
+
+import 'dart:async';
+import 'dart:html';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'package:polymer/polymer.dart';
+
+@CustomTag('my-child-element')
+class MyChildElement extends PolymerElement {
+  @published int number;
+  @published bool boolean;
+  @published String string;
+
+  MyChildElement.created() : super.created();
+}
+
+@CustomTag('my-element')
+class MyElement extends PolymerElement {
+  @observable int number = 1;
+  @observable bool boolean = false;
+  @observable String string = 'a';
+
+  MyElement.created() : super.created();
+}
+
+main() => initPolymer().run(() {
+  useHtmlConfiguration();
+
+  setUp(() => Polymer.onReady);
+  
+  test('child gets initial values', () {
+    var parent = querySelector('my-element');
+    var child = parent.shadowRoot.querySelector('my-child-element');

[Siggi Cherem (dart-lang), 2014/07/09 16:55:49]

sometimes parent/child confuses me because I think of subclasses. What do you
think about renaming them. For example, maybe outer/inner?

[jakemac, 2014/07/09 17:42:16]

Done.

+    
+    expect(child.number, 1);
+    expect(child.boolean, false);
+    expect(child.string, 'a');
+  });
+
+  test('child updates the parent', () {
+    var parent = querySelector('my-element');
+    var child = parent.shadowRoot.querySelector('my-child-element');
+    
+    // Toggle the value in the child and make sure that propagates around.
+    child.number = 2;
+    child.boolean = true;
+    child.string = 'b';
+    return new Future(() {}).then((_) {
+      expect(parent.number, 2);
+      expect(parent.boolean, true);
+      expect(parent.string, 'b');
+      
+      child.number = 1;
+      child.boolean = false;
+      child.string = 'a';
+    }).then((_) => new Future(() {})).then((_) {
+      expect(parent.number, 1);
+      expect(parent.boolean, false);
+      expect(parent.string, 'a');
+    });
+  });
+  
+  test('parent updates the child', () {
+    var parent = querySelector('my-element');
+    var child = parent.shadowRoot.querySelector('my-child-element');
+    
+    // Toggle the value in the parent and make sure that propagates around.
+    parent.number = 2;
+    parent.boolean = true;
+    parent.string = 'b';
+    return new Future(() {}).then((_) {
+      expect(child.number, 2);
+      expect(child.boolean, true);
+      expect(child.string, 'b');
+      
+      parent.number = 1;
+      parent.boolean = false;
+      parent.string = 'a';
+    }).then((_) => new Future(() {})).then((_) {
+      expect(child.number, 1);
+      expect(child.boolean, false);
+      expect(child.string, 'a');
+    });
+  });
+});