Lightweight asynchronous test helper.

dart/tests/compiler/dart2js_extra/timer_negative_test.dart

Index: dart/tests/compiler/dart2js_extra/timer_negative_test.dart
diff --git a/dart/tests/compiler/dart2js_extra/timer_negative_test.dart b/dart/tests/compiler/dart2js_extra/timer_negative_test.dart
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index 0000000000000000000000000000000000000000..d446b8d0326913b3075e1d9b5cdb726713c5c84e
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+++ b/dart/tests/compiler/dart2js_extra/timer_negative_test.dart
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+// Copyright (c) 2012, 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.
+
+import 'dart:isolate';
+
+import 'async_helper.dart';
+
+void test(void onDone(bool success)) {
+  int expected = 4;
+
+  void timerCallback(timer) {
+    if (--expected == 0) onDone(false);
+  }
+
+  new Timer(0, timerCallback);
+  new Timer(10, timerCallback);
+  new Timer(100, timerCallback);
+  new Timer(1000, timerCallback);
+}
+
+main() {
+  asyncTest(test);
+}