// Copyright (c) 2016, 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 abstract void addError(Object error, [StackTrace stackTrace])
/// Send or enqueue an error event.
///
/// The error must not be null.
///
/// @description Checks that the error must not be null.
/// @author ngl@unipro.ru

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

main() {
  StreamController controller = new StreamController();
  Expect.throws(() {
    controller.addError(null);
  });
  controller.close();
}