| // Copyright (c) 2018, 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<T> lastWhere ( |
| /// bool test(T element), { |
| /// dynamic defaultValue(), |
| /// T orElse() |
| /// }) |
| /// Finds the last element in this stream matching test. |
| /// |
| /// As firstWhere, except that the last matching element is found. That means |
| /// that the result cannot be provided before this stream is done. |
| /// . . . |
| /// If an error occurs, or if this stream ends without finding a match and with |
| /// no orElse function provided, the future will receive an error. |
| /// |
| /// @description Checks that if an error occurs in [test] method, the future will |
| /// receive an error. |
| /// @author ngl@unipro.ru |
| |
| import "dart:io"; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| check(test, expected) { |
| asyncStart(); |
| var address = InternetAddress.loopbackIPv4; |
| RawDatagramSocket.bind(address, 0).then((producer) { |
| RawDatagramSocket.bind(address, 0).then((receiver) { |
| int sent = 0; |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent++], address, receiver.port); |
| producer.send([sent], address, receiver.port); |
| producer.close(); |
| |
| Future fValue = receiver.lastWhere(test); |
| fValue.then((value) { |
| Expect.fail('Should not be here.'); |
| }).catchError((e) { |
| Expect.equals(expected, e); |
| }).whenComplete(() { |
| receiver.close(); |
| asyncEnd(); |
| }); |
| }); |
| }); |
| } |
| |
| main() { |
| Error error = new Error(); |
| check((e) => throw 1, 1); |
| check((e) => throw 2, 2); |
| check((e) => throw error, error); |
| } |