LibTest/async/Future/then_A04_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 Future then(dynamic onValue(T value), {Function onError})
///    If onError is not given, and this future completes with an error, the error
/// is forwarded directly to the returned future.
/// @description Checks that if onError is not given, the error is forwarded
/// directly to the returned future.
/// @author a.semenov@unipro.ru

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

void check(Object value) {
  asyncStart();
  new Future.error(value).then((_) {
    Expect.fail("Initial future should complete with error");
  }).then((_) {
    Expect.fail("Returned future should complete with error");
  }, onError: (error) {
    Expect.equals(value, error);
    asyncEnd();
  });
}

main() {
  asyncStart();
  check("0");
  check(20);
  check(3.14);
  check(new Error());
  asyncEnd();
}