Async notification of test failure is needed

dart/pkg/unittest/test_controller.js

Index: dart/pkg/unittest/test_controller.js
diff --git a/dart/pkg/unittest/test_controller.js b/dart/pkg/unittest/test_controller.js
index 6b6153c0f15b08450ddbab050cb506b6a310b80a..3698b3e95588b79e7b0c289939c5829ff1ba6a40 100644
--- a/dart/pkg/unittest/test_controller.js
+++ b/dart/pkg/unittest/test_controller.js
@@ -113,6 +113,10 @@ function dartMainRunner(main) {
     main();
   } catch (e) {
     showErrorAndExit(String(e));
+    // Calling showErrorAndExit will not call testRunner.notifyDone()
+    // at this point. This is because of the async nature of this framework.
+    // testRunner.startedDartTest is not true yet. So post a message.
+    window.postMessage('unittest-suite-fail', '*');
     return; // Posting 'dart-main-done' signals success.
   }
   window.postMessage('dart-main-done', '*');