| // 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.periodic(Duration period, |
| /// [T computation(int computationCount)]) |
| /// The argument to this callback is an integer that starts with 0 and is |
| /// incremented for every event. |
| /// @description Checks that the argument to this callback is an integer that |
| /// starts with 0 and is incremented for every event. |
| /// @author kaigorodov |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| const int maxCount = 5; |
| |
| void check(int periodMs) { |
| String id = "s$periodMs"; |
| Duration period = durationInMilliseconds(periodMs); |
| StreamSubscription<int>? subs; |
| int count = 0; |
| asyncStart(); |
| Stream s = new Stream<int>.periodic(period, (computationCount) { |
| Expect.equals(count, computationCount, |
| "periodic($id): count=$count, computationCount=$computationCount"); |
| if (count > maxCount) { |
| Expect.fail("Stream events should not be generated after cancellation"); |
| } |
| count++; |
| if (count == maxCount) { |
| subs?.cancel(); |
| asyncEnd(); |
| } |
| return count; |
| }); |
| subs = s.listen((data) {}) as StreamSubscription<int>; |
| } |
| |
| main() { |
| check(0); |
| check(1); |
| check(10); |
| check(30); |
| check(-10); |
| } |