LibTest/io/IOSink/close_A02_t01.dart

// Copyright (c) 2017, 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 Future close()
 * NOTE: Writes to the [IOSink] may be buffered, and may not be flushed by a
 * call to close().
 * @description Checks that target consumer cannot be closed while stream is
 * being added to the consumer.
 * @author iarkh@unipro.ru
 */
import "../../../Utils/expect.dart";
import "dart:async";
import "dart:io";

class MyStreamConsumer extends StreamConsumer<List<int>> {
  Future addStream(Stream<List> stream) {
    return new Future(() {});
  }

  Future close() {
    return new Future(() {});
  }
}

main() {
  Stream<List<int>> stream = new Stream<List<int>>.fromIterable([
    [1, 2],
    [12],
    [3, 22]
  ]);
  StreamConsumer<List<int>> consumer = new MyStreamConsumer();
  IOSink sink = new IOSink(consumer);
  sink.addStream(stream).then((x) {
    new Future.delayed(new Duration(seconds: 3)).then((_) {
      sink.close();
    });
  });
  Expect.throws(() {
    sink.close();
  }, (e) => e is StateError);
}