LibTest/isolate/ReceivePort/asBroadcastStream_A03_t02.dart

// 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)})
 * 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 it is a runtime error to try to change event
 * handlers for underlying subscription.
 * @author ilya
 * @author a.semenov@unipro.ru
 */
import "dart:async";
import "IsolateStream.dart" as IsolateStream;
import '../../../Utils/expect.dart';

bool testPassed = false;

void finish() {
  Expect.isTrue(testPassed);
  asyncEnd();
}

main() {
  asyncStart();
  Stream s = IsolateStream.fromIterable([], onDone: finish);

  s.asBroadcastStream(onListen: (StreamSubscription subs) {
    try {
      subs.onData((_) {});
    } catch (e) {
      testPassed = true;
    }
  }).listen((_) {});
}