Close stdout and stderr before terminating the VM.

pkg/unittest/lib/vm_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 on the VM.
  */
 library unittest_vm_config;
 
+import 'dart:async';
 import 'dart:io';
 import 'unittest.dart';
 
 class VMConfiguration extends Configuration {
   void onDone(bool success) {
     try {
       super.onDone(success);
       exit(0);

[Siggi Cherem (dart-lang), 2013/05/07 17:47:48]

do you need to wait here too?

[podivilov, 2013/05/08 12:42:44]

Usually you are not interested in the output of the passing test. Still, it's
probably worth unifying.

     } catch (ex) {
-      // A non-zero exit code is used by the test infrastructure to detect
-      // failure.
-      exit(1);
+      Future.wait([stdout.close(), stderr.close()]).then((_) {
+        // A non-zero exit code is used by the test infrastructure to detect
+        // failure.
+        exit(1);
+      });
     }
   }
 }
 
 void useVMConfiguration() {
   unittestConfiguration = _singleton;
 }
 
 final _singleton = new VMConfiguration();