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) {});
}