| // 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 StreamSubscription<T> listen(void onData(T event), |
| /// {Function onError, void onDone(), bool cancelOnError}) |
| /// The onError callback must be of type void onError(error) or |
| /// void onError(error, StackTrace stackTrace). If onError accepts two |
| /// arguments it is called with the stack trace (which could be null if the |
| /// stream itself received an error without stack trace). Otherwise |
| /// it is called with just the error object. |
| /// @description Checks that onError callback with two parameters can be used |
| /// in which case the second parameter is a stack trace. |
| /// @author ilya |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| const N = 10; |
| |
| main() { |
| Stream<int> s = new Stream.fromIterable(new Iterable.generate(N, (x) => x)); |
| |
| List errors = []; |
| List stackTraces = []; |
| Stream<int> s2 = s.map((event) { |
| try { |
| throw new Error(); |
| } catch (e, st) { |
| errors.add(e); |
| stackTraces.add(st); |
| rethrow; // error and stack trace are the same as e and st |
| } |
| }); |
| |
| asyncMultiStart(N); |
| |
| s2.listen((_) { |
| Expect.fail('unexpected call to onData'); |
| }, onError: (e, st) { |
| Expect.identical(errors.removeAt(0), e); |
| Expect.identical(stackTraces.removeAt(0), st); |
| asyncEnd(); |
| }); |
| } |