LibTest/async/Future/asStream_A02_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 abstract Stream<T> asStream()
 * The stream will produce single data or error event containing the completion
 * result of this future, and then it will close with a done event.
 * @description Checks that the stream is closed after the completion value is
 * send.
 * @author kaigorodov
 */
import "dart:async";
import "../../../Utils/expect.dart";

String output1 = "";

main() {
  var value = 99;
  Completer completer = new Completer();
  Future future = completer.future;
  completer.complete(value);
  Stream stream = future.asStream();
  int count = 1;

  asyncStart();
  stream.listen(
    (var event) {count = count + 1;}, // should be invoked first
    onDone: (){
      Expect.equals(2, count);
      Expect.isTrue(completer.isCompleted);
      asyncEnd();
    }   // should be invoked second
  );
}