| // 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 Future doWhile(FutureOr<bool> f()) |
| /// Perform an async operation repeatedly until it returns false. |
| /// . . . |
| /// Otherwise it waits for the returned Future to complete. |
| /// |
| /// @description Checks that if [f] returns not completed future, [doWhile] |
| /// waits for the returned Future to complete. |
| /// @author ngl@unipro.ru |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| const int N = 4; |
| |
| main() { |
| int num = 0; |
| |
| FutureOr<bool> f() { |
| num++; |
| return new Future.delayed(durationInMilliseconds(100), () => (num < N)); |
| } |
| |
| asyncStart(); |
| Future.doWhile(f).then( |
| (_) { |
| Expect.equals(N, num); |
| asyncEnd(); |
| } |
| ); |
| } |