Lightweight asynchronous test helper.

dart/tests/compiler/dart2js_extra/timer_test.dart

+// 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(true);
+  }
+
+  new Timer(0, timerCallback);
+  new Timer(10, timerCallback);
+  new Timer(100, timerCallback);
+  new Timer(1000, timerCallback);
+}
+
+main() {
+  asyncTest(test);
+}