| // 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}) |
| /// On errors from this stream, the onError handler is given a object describing |
| /// the error. |
| /// @description Checks that the onError handler is given an object describing |
| /// the error. |
| /// @author kaigorodov |
| |
| library listen_A03_t01; |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T>(Stream<T> s, List<T> data, List errors) { |
| List<T> dataSink = []; |
| List errorSink = []; |
| asyncStart(); |
| s.listen((T event) { |
| dataSink.add(event); |
| }, onError: (Object error) { |
| errorSink.add(error); |
| }, onDone: () { |
| Expect.listEquals(data, dataSink); |
| Expect.listEquals(errors, errorSink); |
| asyncEnd(); |
| }); |
| } |
| |
| void test(CreateStreamWithErrorsFunction create) { |
| check(create([], defaultValue: 42), [], []); |
| check(create([1, 2, 3, 4], isError: (x) => false, defaultValue: 42), |
| [1, 2, 3, 4], []); |
| check(create([1, 2, 3, 4], isError: (x) => true, defaultValue: 42), |
| [], [1, 2, 3, 4]); |
| check<int>(create([1, 2, 3, 4], isError: (x) => x.isOdd, defaultValue: 42), |
| [2, 4], [1, 3]); |
| check(create( |
| [null, "2", -3, 4.0, []], isError: (x) => x is num, defaultValue: 42), |
| [null, "2", []], [-3, 4.0]); |
| } |