unittest: A unittest with 0 test cases should PASS, fixed incorrect unittest-suite-* messages

pkg/unittest/lib/html_enhanced_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.
 
 /**
  * A simple unit test library for running tests in a browser.
  *
  * Provides enhanced HTML output with collapsible group headers
  * and other at-a-glance information about the test results.
  */
@@ skipping 73 matching lines @@
   }
 
   void onSummary(int passed, int failed, int errors, List<TestCase> results,
       String uncaughtError) {
     _showInteractiveResultsInPage(passed, failed, errors, results,
         _isLayoutTest, uncaughtError);
   }
 
   void onDone(bool success) {
     _uninstallHandlers();
-    window.postMessage('unittest-suite-done', '*');
+    if (success) {
+      window.postMessage('unittest-suite-success', '*');
+    } else {
+      window.postMessage('unittest-suite-fail', '*');
+    }
   }
 
   void _showInteractiveResultsInPage(int passed, int failed, int errors,
       List<TestCase> results, bool isLayoutTest, String uncaughtError) {
     if (isLayoutTest && passed == results.length) {
       document.body.innerHtml = "PASS";
     } else {
       // changed the StringBuffer to an Element fragment
       Element te = new Element.html('<div class="unittest-table"></div>');
 
@@ skipping 305 matching lines @@
 
   ''';
 }
 
 void useHtmlEnhancedConfiguration([bool isLayoutTest = false]) {
   unittestConfiguration = isLayoutTest ? _singletonLayout : _singletonNotLayout;
 }
 
 final _singletonLayout = new HtmlEnhancedConfiguration(true);
 final _singletonNotLayout = new HtmlEnhancedConfiguration(false);