LibTest/isolate/ReceivePort/transform_A01_t02.dart

// Copyright (c) 2011, 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 Stream transform(StreamTransformer<T, dynamic> streamTransformer)
/// Chains this stream as the input of the provided StreamTransformer.
/// Returns the result of streamTransformer.bind itself.
/// @description Checks that data events are produced according to transform.
/// @author ilya

import "dart:async";
import "../../../Utils/expect.dart";
import "IsolateStream.dart" as IsolateStream;

var input = [1, 2, 3, 4, 5];
var expected = [1, 2, 3, 6, 5, 10];

// transform: skip evens, produce number and its double
StreamTransformer createMyTransformer() {
  return new StreamTransformer.fromHandlers(
      handleData: (event, EventSink sink) {
    if (event.isOdd) {
      sink.add(event);
      sink.add(event * 2);
    }
  });
}

main() {
  var s = IsolateStream.fromIterable(input).transform(createMyTransformer());
  var actual = [];

  asyncStart();

  s.listen((x) {
    actual.add(x);
  }, onDone: () {
    Expect.listEquals(expected, actual);
    asyncEnd();
  });
}