| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion Stream.periodic(Duration period, |
| /// [T computation(int computationCount)]) |
| /// The event values are computed by invoking computation. |
| /// @description Checks that event values are computed by invoking computation. |
| /// @author kaigorodov |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(int periodMs) { |
| Stream s = new Stream<int>.periodic(durationMs(periodMs), |
| (computationCount) => computationCount * periodMs); |
| int count = 0; |
| asyncStart(); |
| StreamSubscription<int> subs; |
| subs = s.listen((data) { |
| Expect.equals(count * periodMs, data, "check($periodMs): data=$data"); |
| if (count++ == 10) { |
| subs.cancel(); |
| asyncEnd(); |
| } |
| }) as StreamSubscription<int>; |
| } |
| |
| main() { |
| check(0); |
| check(1); |
| check(10); |
| check(30); |
| check(-10); |
| } |