LibTest/io/RawDatagramSocket/asyncExpand_A03_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  eventfile.

/// @assertion Stream<E> asyncExpand<E>(Stream<E> convert(T event))
/// Transforms each element into a sequence of asynchronous events.
/// . . .
/// The returned stream is a broadcast stream if this stream is.
///
/// @description Checks that the returned stream is a broadcast stream if this
/// stream is.
/// @author ngl@unipro.ru

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

var localhost = InternetAddress.loopbackIPv4;

check(Stream convert(event)) async {
  RawDatagramSocket receiver = await RawDatagramSocket.bind(localhost, 0);

  Stream stream1 = receiver.asyncExpand(convert);
  Expect.isFalse(stream1.isBroadcast);
  var stream = receiver.asBroadcastStream();
  Stream stream2 = stream.asyncExpand(convert);
  Expect.isTrue(stream2.isBroadcast);
  receiver.close();
}

main() {
  check((e) => new Stream.fromIterable([e]));
  check((e) => new Stream.fromIterable([e, e]));
}