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.

// @dart = 2.9

/// @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> stream = new Stream<List<int>>.fromIterable([[1, 2], [12], [3, 22]]);
  StreamConsumer 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);
}