blob: f95cc8b48f62672628f66840c5b260def7b20468 [file] [log] [blame]
// Copyright (c) 2011, 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.
/// @assertion Stream<T> asBroadcastStream (
/// {void onListen(StreamSubscription<T> subscription),
/// void onCancel(StreamSubscription<T> subscription)})
/// Returns a multi-subscription stream that produces the same events as this.
/// If onListen is provided, it is called with a subscription-like object that
/// represents the underlying subscription to this stream. It is possible to
/// pause, resume or cancel the subscription during the call to onListen. It
/// is not possible to change the event handlers, including using
/// StreamSubscription.asFuture.
/// @description Checks that onListen callback is called when broadcast stream
/// gets its subscribers and if subscription to underlying stream is cancelled
/// in this callback, no onData events will be fired.
/// @author ilya
library asBroadcastStream_A03_t01;
import "dart:async";
import "../../../Utils/expect.dart";
void test(CreateStreamFunction create) {
Stream<int> s = create([1,2,3,4,5]);
Stream<int> b = s.asBroadcastStream(onListen: (StreamSubscription ss) {
b.listen((_) {'unexpected onData event');
b.listen((_) {'unexpected onData event');