LibTest/async/Stream/expand_A02_t02.test.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.

/// @assertion Stream<S> expand<S>(Iterable<S> convert(T value))
/// The returned stream is a broadcast stream if this stream is.
/// @description Checks that it is several subscriptions are possible for
/// broadcast stream.
/// @author a.semenov@unipro.ru

library expand_A02_t02;

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

void check<T, S>(Stream<T> s, Iterable<S> convert(T value), List<S> expected) {
  asyncStart();
  Stream<S> stream = s.asBroadcastStream().expand(convert);
  Future.wait([stream.toList(), stream.toList(), stream.toList()])
      .then((List<List<S>> results) {
    Expect.equals(3, results.length);
    results.forEach((actual) => Expect.listEquals(expected, actual));
    asyncEnd();
  });
}

void test(CreateStreamFunction create) {
  check(create([]), (value) => [], []);
  check(create([]), (value) => [1], []);

  check(create([1, 2, 3]), (value) => [], []);
  check(create([1, 2, 3]), (value) => [1], [1, 1, 1]);
  check(create([1, 2, 3]), (value) => [value], [1, 2, 3]);
  check(create([1, 2, 3]), (v) => [v, v], [1, 1, 2, 2, 3, 3]);
  check(create([1, 2, 3]), (v) => [null, v], [null, 1, null, 2, null, 3]);

  check<List<int>, int>(
      create([
        [1, 2, 3],
        [4, 5]
      ]),
      (value) => value,
      [1, 2, 3, 4, 5]);
}