Migrated test block 167 to Dart 2.0.

tests/lib/async/catch_errors28_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';
-
-main() {
-  asyncStart();
-  Completer done = new Completer();
-
-  var events = [];
-  // Test that periodic Timers are handled correctly by `catchErrors`.
-  catchErrors(() {
-    int counter = 0;
-    new Timer.periodic(const Duration(milliseconds: 50), (timer) {
-      if (counter == 5) {
-        timer.cancel();
-        done.complete(true);
-      }
-      counter++;
-      events.add(counter);
-    });
-  }).listen((x) {
-    events.add(x);
-  }, onDone: () {
-    Expect.fail("Unexpected callback");
-  });
-
-  done.future.whenComplete(() {
-    // Give handlers time to run.
-    Timer.run(() {
-      Expect.listEquals([
-        "main exit",
-        1,
-        2,
-        3,
-        4,
-        5,
-        6,
-      ], events);
-      asyncEnd();
-    });
-  });
-
-  events.add("main exit");
-}