for discussion: support for zones in DOM events

tests/html/events_test.dart

Index: tests/html/events_test.dart
diff --git a/tests/html/events_test.dart b/tests/html/events_test.dart
index 8451c893d6363a04d452f576541e060cb3574ef7..73de9453c55899621c1ebf38a107a041cf6ae716 100644
--- a/tests/html/events_test.dart
+++ b/tests/html/events_test.dart
@@ -1,7 +1,13 @@
-library EventsTest;
-import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_config.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 tests.html.events_test;
+
+import 'dart:async';
 import 'dart:html';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
 
 main() {
   useHtmlConfiguration();
@@ -72,4 +78,39 @@ main() {
     DivElement div = new Element.tag('div');
     MouseEvent event = new MouseEvent('zebra', relatedTarget: div);
   });
+
+  test('DOM event callbaccks are associated with the correct zone', () {
+    var callbacks = [];
+    runZonedExperimental(expectAsync0(() {
+      final element = new Element.tag('test');
+      element.id = 'eventtarget';
+      document.body.append(element);
+
+      int asyncCounter = 0;
+      var asyncCallback = expectAsync0(() {
+        asyncCounter++;
+      });
+
+      void handler(Event e) {
+        expect(e.type, equals('test'));
+        Element target = e.target;
+        expect(element, equals(target));
+
+        runAsync(asyncCallback);
+      }
+
+      var provider = new EventStreamProvider<CustomEvent>('test');
+      var sub = provider.forTarget(element).listen(expectAsync1(handler));
+      element.dispatchEvent(new Event('test'));
+
+      expect(callbacks.length, 1, reason: 'event was run in a zone.');
+      expect(asyncCounter, 0, reason: 'callback was not invoked yet.');
+      callbacks.first();
+      expect(asyncCounter, 1, reason: 'callback was invoked.');
+      sub.cancel();
+    }), onRunAsync: (x) {
+      callbacks.add(x);
+      return x;
+    });
+  });
 }