Refactor of PolymerExpressions. Adds "as" expressions.

pkg/polymer_expressions/test/bindings_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 bindings_test;
 
 import 'dart:async';
 import 'dart:html';
 
 import 'package:logging/logging.dart';
 import 'package:observe/observe.dart';
 import 'package:observe/src/dirty_check.dart' show dirtyCheckZone;
 import 'package:polymer_expressions/polymer_expressions.dart';
 import 'package:template_binding/template_binding.dart' show templateBind;
-import 'package:unittest/html_config.dart';
+//import 'package:unittest/html_config.dart';
+import 'package:unittest/html_enhanced_config.dart';

[Jennifer Messerly, 2014/03/17 23:10:08]

FWIW. I have a very hard time debugging failures using enchanced config. It can
obscure information about failures. I've changed tests to use raw html_config
wherever possible.

[justinfagnani, 2014/04/24 00:26:13]

Done, but I usually have to solo a test and disable the tearDown to debug it
anyway, so I didn't care much about the configuration.

+
 import 'package:unittest/unittest.dart';
 
 main() => dirtyCheckZone().run(() {
-  useHtmlConfiguration();
+  useHtmlEnhancedConfiguration();
+//  useHtmlConfiguration();
 
   group('bindings', () {
     var stop = null;
     var messages = [];
     var testDiv;
     setUp(() {
       stop = Logger.root.onRecord.listen((r) => messages.add(r));
       document.body.append(testDiv = new DivElement());
     });
 
@@ skipping 96 matching lines @@
 @reflectable
 class NotifyModel extends ChangeNotifier {
   var _x;
   NotifyModel([this._x]);
 
   get x => _x;
   set x(value) {
     _x = notifyPropertyChange(#x, _x, value);
   }
 }