LibTest/io/IOSink/addError_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 void addError(error, [StackTrace stackTrace])
/// This function must not be called when a stream is currently being added using
/// [addStream].
/// @description Checks that adding [error] when another stream is being added
/// causes [StateError].
/// @author iarkh@unipro.ru

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

class MyStreamConsumer extends StreamConsumer<List<int>> {
  Future<dynamic> addStream(Stream<List<int>> stream) {
    stream.toList().then((x) {
    }, onError: (error, StackTrace st) {
      Expect.equals("ERROR", error.toString());
    });
    return new Future(() {});
  }
  Future close() { return new Future(() {}); }
}

main() {
  asyncStart();
  StreamConsumer consumer = new MyStreamConsumer();
  IOSink sink = new IOSink(consumer);
  Stream<List<int>> aStream = new Stream<List<int>>.fromIterable([[1, 2, 3, 4, 5]]);
  sink.addStream(aStream).then((x) {
    new Future.delayed(new Duration(seconds: 3)).then((_) {
      sink.close();
      asyncEnd();
    });
  });
  Expect.throws(() { sink.addError("ERROR"); }, (e) => e is StateError);
}