tests/lib/async/catch_errors19_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 'dart:async';

import 'package:expect/async_helper.dart';
import 'package:expect/expect.dart';

import 'catch_errors.dart';

void main() {
  asyncStart();
  Completer done = Completer();

  var events = [];
  Stream stream = Stream.periodic(const Duration(milliseconds: 20), (x) => x);
  // Test that asynchronous callbacks in the done-handler of streams (here
  // the `catchErrors`-stream) keep a zone alive.
  catchErrors(() {
    var subscription;
    subscription = stream
        .take(5)
        .listen(
          (x) {
            events.add(x);
          },
          onDone: () {
            Future.delayed(const Duration(milliseconds: 30), () {
              events.add(499);
              done.complete(true);
            });
          },
        );
  }).listen(
    (x) {
      events.add("outer: $x");
    },
    onDone: () {
      Expect.fail("Unexpected callback");
    },
  );

  done.future.whenComplete(() {
    // Give handlers time to run.
    Timer.run(() {
      Expect.listEquals([0, 1, 2, 3, 4, 499], events);
      asyncEnd();
    });
  });
}