LibTest/async/StreamController/StreamController_A03_t01.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 events
 * until the subscriber is registered.
 * @author kaigorodov
 */
import "dart:async";
import "../../../Utils/expect.dart";

void check(List source) {
  StreamController controller = new StreamController();
  Stream s = controller.stream;
  List sink = [];

  source.forEach((e) => controller.add(e));
  Expect.isTrue(sink.isEmpty);

  asyncStart();
  s.listen(
    (event) {
      sink.add(event);
    },
    onDone:() {
        Expect.listEquals(source, sink);
        asyncEnd();
    }
  );

  controller.close();
}

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