Migrated test block 170 to Dart 2.0.

tests/lib/async/intercept_schedule_microtask6_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:async_helper/async_helper.dart';
-import "package:expect/expect.dart";
-import 'dart:async';
-import 'catch_errors.dart';
-
-class A {
-  add(x) => print(x);
-}
-
-var events = [];
-
-body() {
-  events.add("body entry");
-  scheduleMicrotask(() {
-    events.add("run async body");
-    throw "foo";
-  });
-  return 499;
-}
-
-onAsyncHandler(fun) {
-  events.add("async handler");
-  scheduleMicrotask(fun);
-  events.add("async handler done");
-}
-
-onErrorHandler(e) {
-  events.add("error: $e");
-}
-
-main() {
-  asyncStart();
-
-  // Test that runZonedScheduleMicrotask works when async, error and done
-  // are used.
-  var result = runZonedScheduleMicrotask(body,
-      onScheduleMicrotask: onAsyncHandler, onError: onErrorHandler);
-  events.add("after");
-  Timer.run(() {
-    Expect.listEquals([
-      "body entry",
-      "async handler",
-      "async handler done",
-      "after",
-      "run async body",
-      "error: foo"
-    ], events);
-    asyncEnd();
-  });
-}