| // 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]); |
| } |