Add first version of runAsync.

tests/lib/async/run_async2_test.dart

Index: tests/lib/async/run_async2_test.dart
diff --git a/tests/lib/async/run_async2_test.dart b/tests/lib/async/run_async2_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0343c7931925ea1613e966b250a82601cb9302de
--- /dev/null
+++ b/tests/lib/async/run_async2_test.dart
@@ -0,0 +1,21 @@
+// 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.
+
+library run_async_test;
+
+import 'dart:async';
+import '../../../pkg/unittest/lib/unittest.dart';
+
+main() {
+  // Check that the callbacks are executed in order.
+  test("run async in order test", () {
+    int lastCallback = -1;
+    for (int i = 0; i < 100; i++) {
+      runAsync(expectAsync0(() {
+        Expect.equals(lastCallback, i - 1);
+        lastCallback = i;
+      }));
+    }
+  });
+}