LibTest/io/IOSink/write_A01_t07.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 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 [toString] is called when writing object to the
/// consumer
/// @author iarkh@unipro.ru

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

int called = 0;
int printed = 0;

String str = "I am here";
List<int> res = [73, 32, 97, 109, 32, 104, 101, 114, 101];

class ObjectToPass {
  String toString() {
    called++;
    return str;
  }
}

class MyStreamConsumer extends StreamConsumer<List<int>> {
  Future close() { return new Future(() {}); }
  Future addStream(Stream<List<int>> stream) {
    stream.toList().then((x) {
      printed++;
      Expect.listEquals(res, x.first);
    });
    return new Future(() {});
  }
}

test() async {
  StreamConsumer<List<int>> consumer = new MyStreamConsumer();
  IOSink sink = new IOSink(consumer);
  sink.write(new ObjectToPass());
  await sink.flush();
  Expect.equals(1, called);
  Expect.equals(1, printed);
  asyncEnd();
}

main() {
  asyncStart();
  test();
}