Zone support for Futures.

tests/lib/async/catch_errors2_test.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.
+
+import "package:expect/expect.dart";
+import 'dart:async';
+import 'dart:isolate';
+
+main() {
+  // We keep a ReceivePort open until all tests are done. This way the VM will
+  // time out if the callbacks are not invoked.
+  var port = new ReceivePort();
+  bool futureWasExecuted = false;
+  // Make sure that `catchErrors` only closes the error stream when the inner
+  // futures are done.
+  catchErrors(() {
+    new Future(() {
+      futureWasExecuted = true;
+    });
+    return 'allDone';
+  }).listen((x) {
+      Expect.fail("Unexped callback");
+    },
+    onDone: () {
+      Expect.isTrue(futureWasExecuted);
+      port.close();
+    });
+}