LibTest/async/StreamController/isClosed_A01_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.

// @dart = 2.9

/// @assertion bool isClosed
/// Whether the stream is closed for adding more events.
/// If the controller is closed, the "done" event might not have been delivered
/// yet, but it has been scheduled, and it is too late to add more events.
///
/// @description Checks that the property returns correct value. Checks that an
/// error is thrown if events are added after the stream is closed. A broadcast
/// stream is checked.
/// @author kaigorodov


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

main() {
  StreamController controller = new StreamController.broadcast();
  Expect.isFalse(controller.isClosed);

  List events1 = new List();
  StreamSubscription ss = controller.stream.listen(
      (event) {events1.add(event);});
  Expect.isFalse(controller.isClosed);

  controller.add(1);
  Expect.isFalse(controller.isClosed);

  controller.close();
  Expect.isTrue(controller.isClosed);

  Expect.throws(() =>  controller.add(0), null, "add() works after close()");

}