| // 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 asyncMap(dynamic convert(T event)) |
| /// Creates a new stream with each data event of this stream asynchronously |
| /// mapped to a new event. |
| /// |
| /// This acts like map, except that convert may return a Future, and in that |
| /// case, the stream waits for that future to complete before continuing with |
| /// its result. |
| /// |
| /// @description Checks that if convert return a Future, the stream waits for |
| /// that future to complete before continuing with its result. |
| /// @author a.semenov@unipro.ru |
| |
| library asyncMap_A01_t04; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T>(Stream<T> stream, List<T> expected) { |
| AsyncExpect.data( |
| expected, |
| stream.asyncMap((e) => |
| new Future.delayed(durationInMilliseconds(50), () => e)) |
| ); |
| } |
| |
| void test(CreateStreamFunction create) { |
| check(create([]), []); |
| check(create([1, 2, 3, 4]), [1, 2, 3, 4]); |
| check(create([null, "2", -3, 4.0, []]), [null, "2", -3, 4.0, []]); |
| } |