LibTest/async/StreamController/StreamController_A03_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 StreamController({void onListen(), void onPause(),
///                  void onResume(), dynamic onCancel(), bool sync: false})
/// The controller buffers all incoming events until a subscriber is registered,
/// but this feature should only be used in rare circumstances.
///
/// @description Checks that the controller will buffer all incoming data and
/// errors until the subscriber is registered.
/// @author a.semenov@unipro.ru

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

void check(List source) {
  StreamController controller = new StreamController();
  Stream s = controller.stream;
  List expectedData = source.where((e) => !(e is num) || e >= 0).toList();
  List expectedErrors = source.where((e) => e is num && e < 0).toList();
  List sink = [];
  List errorSink = [];

  for (var event in source) {
    if (event is num && event < 0) {
      controller.addError(event);
    } else {
      controller.add(event);
    }
  }

  Expect.isTrue(sink.isEmpty);
  Expect.isTrue(errorSink.isEmpty);

  asyncStart();
  s.listen((event) {
    sink.add(event);
  }, onError: (error) {
    errorSink.add(error);
  }, onDone: () {
    Expect.listEquals(expectedData, sink);
    Expect.listEquals(expectedErrors, errorSink);
    asyncEnd();
  });

  controller.close();
}

main() {
  check([]);
  check([-1, -2, -3, -4, -5]);
  check([1, 2, -3, 4, -5, 6, 7, -8, 9, 0]);
}