LibTest/io/RawDatagramSocket/every_A01_t01.dart

// 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.

// @dart = 2.9

/// @assertion Future<bool> every(bool test(T element))
/// Checks whether test accepts all elements provided by this stream.
///
/// Calls test on each element of the stream. If the call returns false, the
/// returned future is completed with false and processing stops.
///
/// If the stream ends without finding an element that test rejects, the returned
/// future is completed with true.
///
/// @description Checks that [test] accepts the single element provided by this
/// RawDatagramSocket, and if the call returns false, the returned future is
/// completed with false, otherwise the returned future is completed with true.
/// @author ngl@unipro.ru

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

var localhost = InternetAddress.loopbackIPv4;

Future<bool> checkEvery(test) async {
  RawDatagramSocket producer = await RawDatagramSocket.bind(localhost, 0);
  RawDatagramSocket receiver = await RawDatagramSocket.bind(localhost, 0);
  List<List<int>> toSend = [[0, 1, 2, 3], [1, 2, 3], [2, 3], [3]];
  Completer<bool> completer = new Completer<bool>();
  Future<bool> f = completer.future;

  bool wasSent = await sendDatagram(producer, toSend, localhost, receiver.port);
  Expect.isTrue(wasSent, "No datagram was sent");
  receiver.close();

  Future fValue = receiver.every(test);
  fValue.then((value) {
    if (!completer.isCompleted) {
      completer.complete(value);
    }
    return f;
  });

  return f;
}

main() async {
  int attempts = 5;

  check(test, expected) async{
    for (int i = 0; i < attempts; i++) {
      bool value = await checkEvery(test);
      if (value == expected) {
        break;
      }
      if (i == attempts - 1) {
        print('$value element not found. Look like test failed.');
      }
    }
  }

  await check((e) => e == RawSocketEvent.write, false);
  await check((e) => e == RawSocketEvent.read, false);
  await check((e) => e == RawSocketEvent.closed, true);
  await check((e) => e == RawSocketEvent.readClosed, false);
}