LibTest/io/IOSink/addError_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 addError(error, [StackTrace stackTrace])
/// Passes the [error] to the target consumer as an error event.
/// @description Checks that result error [StackTrace] in consumer is [null] if
/// it was not specified in the [addError] call.
/// @author iarkh@unipro.ru

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

int called = 0;

class MyStreamConsumer extends StreamConsumer<List<int>> {
  Future<dynamic> addStream(Stream<List> stream) {
    stream.toList().then((x) {
      Expect.fail("Should not be here!");
    }, onError: (error, StackTrace st) {
      called++;
      Expect.isNotNull(st);
      Expect.equals("", st.toString());
    });
    return new Future(() {});
  }
  Future close() { return new Future(() {}); }
}

test() async {
  StreamConsumer consumer = new MyStreamConsumer();
  IOSink sink = new IOSink(consumer);
  sink.addError("ERROR");
  await sink.close();
  Expect.equals(1, called);
  asyncEnd();
}

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