| /* |
| * Copyright (c) 2017, 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<bool> isEmpty |
| * Whether this stream contains any elements. |
| * |
| * Waits for the first element of this stream, then completes the returned |
| * future with true. If the stream ends without emitting any elements, the |
| * returned future is completed with false. |
| * |
| * @description Checks that isEmpty returns false as RawDatagramSocket cannot |
| * be empty. |
| * @author ngl@unipro.ru |
| */ |
| import "dart:io"; |
| import "../../../Utils/expect.dart"; |
| |
| check([bool no_write_events = false]) { |
| asyncStart(); |
| var address = InternetAddress.loopbackIPv4; |
| RawDatagramSocket.bind(address, 0).then((producer) { |
| if (no_write_events) { |
| producer.writeEventsEnabled = false; |
| } |
| var socket = producer.asBroadcastStream(); |
| var rValue; |
| |
| void act() { |
| Expect.isFalse(rValue); |
| producer.close(); |
| asyncEnd(); |
| } |
| |
| socket.isEmpty.timeout(const Duration(milliseconds: 200), onTimeout: () { |
| producer.close(); |
| }); |
| |
| socket.isEmpty.then((value) { |
| rValue = value; |
| }).whenComplete(act); |
| }); |
| } |
| |
| main() { |
| check(); |
| check(true); |
| } |