LibTest/async/StreamController/addStream_A03_t01.dart

// Copyright (c) 2011, 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 addStream(Stream<T> source, {bool cancelOnError: true})
/// If cancelOnError is true, only the first error on source is forwarded to
/// the controller's stream, and the addStream ends after this.
/// If cancelOnError is false, all errors are forwarded and only a done event
/// will end the addStream.
///
/// @description Checks that if cancelOnError is true, addStream ends after the
/// first error. Also checks that default value of cancelOnError is true.
/// @author ilya

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

void listen(Stream stream, List expectedData, List expectedErrors) {
  List actualData = [];
  List actualErrors = [];

  asyncStart();
  stream.listen(
      (x) {
        actualData.add(x);
      },
      onError: (x) {
        actualErrors.add(x);
      },
      onDone: () {
        Expect.listEquals(expectedData, actualData);
        Expect.listEquals(expectedErrors, actualErrors);
        asyncEnd();
      }
  );
}

// new stream, negative data become errors
Stream toDataErrorStream(Stream stream) => stream.map((x) => x < 0 ? throw x : x);

main() {
  StreamController c = new StreamController();
  List iterable = [1, 2, 3, -1, -2, -3, 4, 5, 6];
  Stream s1 = toDataErrorStream(new Stream.fromIterable(iterable));
  Stream s2 = toDataErrorStream(new Stream.fromIterable(iterable));

  listen(c.stream, [1, 2, 3, 4, 5, 6, 1, 2, 3], [-1, -2, -3, -1]);

  asyncStart();
  c.addStream(s1).then((_) {
    c.addStream(s2, cancelOnError:true).then((_) {
      c.close();
      asyncEnd();
    });
  });
}