LibTest/io/RawDatagramSocket/map_A01_t02.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 Stream<S> map<S>(S convert(T event))
/// Creates a new stream that converts each element of this stream to a new value
/// using the convert function.
///
/// For each data event, o, in this stream, the returned stream provides a data
/// event with the value convert(o).
///
/// @description Checks that for each event received with RawDatagramSocket
/// method asyncMap returns specified value.
/// @author ngl@unipro.ru

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

check(convert(event), List expected) {
  asyncStart();
  var address = InternetAddress.loopbackIPv4;
  RawDatagramSocket.bind(address, 0).then((producer) {
    RawDatagramSocket.bind(address, 0).then((receiver) {
      int sent = 0;
      int counter = 0;
      Timer timer;
      List list = [];
      producer.send([sent++], address, receiver.port);
      producer.send([sent++], address, receiver.port);
      producer.send([sent++], address, receiver.port);
      producer.close();

      Stream s = receiver.map(convert);
      s.listen((event) {
        list.add(event);
        receiver.receive();
        counter++;
        if (timer != null) {
          timer.cancel();
        }
        timer = new Timer(const Duration(milliseconds: 200), () {
          Expect.isNull(receiver.receive());
          receiver.close();
        });
      }).onDone(() {
        Expect.equals(4, counter);
        Expect.listEquals(expected, list);
        asyncEnd();
      });
    });
  });
}

main() {
  check((e) => e, [
    RawSocketEvent.write,
    RawSocketEvent.read,
    RawSocketEvent.read,
    RawSocketEvent.closed
  ]);
  check((e) => [1, 2], [
    [1, 2],
    [1, 2],
    [1, 2],
    [1, 2]
  ]);
}