| // Copyright (c) 2016, 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 asyncExpand(Stream convert(T event)) |
| /// Creates a new stream with the events of a stream per original event. |
| /// ... |
| /// If convert returns null, no value is put on the output stream, just as if it |
| /// returned an empty stream. |
| /// |
| /// @description Checks that the returned stream is a broadcast stream |
| /// if source stream is. |
| /// @author a.semenov@unipro.ru |
| |
| library asyncExpand_A03_t01; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T,E>(Stream<T> stream, Stream<E>? convert(T event)) { |
| Expect.equals(stream.isBroadcast, stream.asyncExpand(convert).isBroadcast); |
| } |
| |
| void test(CreateStreamFunction create) { |
| |
| check(create([]), (_) => null); |
| check(create([]).asBroadcastStream(), (_) => null); |
| |
| check(create([1, 2, 3, 4, 5]), (_) => null); |
| check(create([1, 2, 3, 4, 5]).asBroadcastStream(), (_) => null); |
| |
| check(create([]), (e) => create([e])); |
| check(create([]).asBroadcastStream(), (e) => create([e])); |
| |
| check(create([1, 2, 3, 4, 5]), (e) => create([e])); |
| check(create([1, 2, 3, 4, 5]).asBroadcastStream(), (e) => create([e])); |
| |
| check(create([1, 2, 3, 4, 5]), (e) => create([e, e])); |
| check(create([1, 2, 3, 4, 5]).asBroadcastStream(), (e) => create([e,e])); |
| } |