// 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 void completeError(Object exception, [Object stackTrace])
/// Calling complete or completeError must not be done more than once.
/// @description Checks that an error is thrown if
/// the completer is already completed with a not completed future.
/// @author a.semenov@unipro.ru

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

import "dart:async";

main() {
  Completer completer1 = new Completer();
  Completer completer2 = new Completer();
  completer1.complete(completer2.future);

  Expect.throws(() => completer1.completeError('another value'));
}