LibTest/async/StreamTransformer/StreamTransformer.fromHandlers_A01_t04.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 factory StreamTransformer.fromHandlers({void handleData(S data,
 *   EventSink<T> sink), void handleError(Object error, StackTrace stackTrace,
 *   EventSink<T> sink), void handleDone(EventSink<T> sink)})
 * Creates a StreamTransformer that delegates events to the given functions.
 *
 * @description Checks the case when all handlers are provided, errors
 * converted to data, and handleDone() adds extra data elements.
 * @author ilya
 */
import "dart:async";
import "../../../Utils/async_utils.dart";
import "../../../Utils/expect.dart";

main() {
  var s = new Stream.fromIterable([1,2,3,4,5]);
  
  // odd numbers as data events, even numbers as error events
  s = s.map((x) => x.isOdd ? x : throw x);

  var tr = new StreamTransformer.fromHandlers(
      handleData:(x, sink) { sink.add(x); },
      handleError: (x, st, sink) { sink.add(x); },
      handleDone: (sink) { sink.add(6); sink.add(7); sink.close(); }
  );
  
  asyncStart();
  s.transform(tr).toList().then((x) {
    Expect.listEquals([1,2,3,4,5,6,7], x);
    asyncEnd();
  });
}