LibTest/async/StreamController/StreamController.broadcast_A07_t01.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 StreamController.broadcast({void onListen(), void onCancel(),
///                                       bool sync: false})
/// The onListen callback is called when the first listener is subscribed,
/// and the onCancel is called when there are no longer any active listeners.
///
/// @description Checks that the onListen function is called when the stream
/// receives its listener.
/// @author kaigorodov

import "dart:async";
import "../../../Utils/expect.dart";

main() {
  bool onListenCalled = false;
  asyncStart();
  StreamController controller = new StreamController.broadcast(
    onListen: () {
      onListenCalled = true;
      asyncEnd();
    }
  );

  Expect.isFalse(onListenCalled);
  StreamSubscription subs = controller.stream.listen((event) {});
}