LibTest/io/IOSink/writeAll_A01_t04.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 void write(Object obj)
/// Converts [obj] to a [String] by invoking [Object.toString] and adds the
/// encoding of the result to the target consumer.
/// @description Checks that calling [writeAll(null)] causes [Error].
/// @author iarkh@unipro.ru

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

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

main () {
  StreamConsumer consumer = new MyStreamConsumer();
  IOSink sink = new IOSink(consumer);
  Expect.throws(() { sink.writeAll(null); }, (e) => e is NoSuchMethodError);
  sink.close();
}