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

import "dart:async";

main() {
  var completer = new Completer();
  completer.future.catchError((Object e) => 1);
  completer.completeError('value');

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