LibTest/async/Completer/completeError_A03_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 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 value.
 * @author msyabro
 */
import "../../../Utils/expect.dart";
import "dart:async";

main() {
  var completer = new Completer();
  completer.complete('value');

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