Fixing custom event test on IE

tests/html/event_customevent_test.dart

Index: tests/html/event_customevent_test.dart
diff --git a/tests/html/event_customevent_test.dart b/tests/html/event_customevent_test.dart
index 42e3031d2f878e0f4a0494454a825ddb5d385fdc..f9168a9401d91cd13b98017b604055cc27d405f1 100644
--- a/tests/html/event_customevent_test.dart
+++ b/tests/html/event_customevent_test.dart
@@ -7,6 +7,7 @@ library EventCustomEventTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
+import 'dart:js' as js;
 
 class DartPayloadData {
   final dartValue;
@@ -54,18 +55,21 @@ main() {
   });
 
   test('custom events to JS', () {
+    expect(js.context['gotDartEvent'], isNull);
     var scriptContents = '''
       window.addEventListener('dart_custom_event', function(e) {
         if (e.detail == 'dart_message') {
           e.preventDefault();
+          window.gotDartEvent = true;
         }
+        window.console.log('here' + e.detail);

[vsm, 2013/10/16 23:49:01]

Do we need this print?

[blois, 2013/10/17 00:05:32]

Nope, gone.

       }, false);''';
 
     document.body.append(new ScriptElement()..text = scriptContents);
 
     var event = new CustomEvent('dart_custom_event', detail: 'dart_message');
     window.dispatchEvent(event);
-    expect(event.defaultPrevented, isTrue);
+    expect(js.context['gotDartEvent'], isTrue);
   });
 
   test('custom data to Dart', () {