Index: tests/lib_2/async/periodic_timer2_test.dart |
diff --git a/tests/lib_2/async/periodic_timer2_test.dart b/tests/lib_2/async/periodic_timer2_test.dart |
new file mode 100644 |
index 0000000000000000000000000000000000000000..4891877b09350688574048c49c45d769fafbdc0c |
--- /dev/null |
+++ b/tests/lib_2/async/periodic_timer2_test.dart |
@@ -0,0 +1,32 @@ |
+// 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. |
+ |
+import 'dart:async'; |
+import 'package:expect/expect.dart'; |
+import 'package:async_helper/async_helper.dart'; |
+ |
+const ms = const Duration(milliseconds: 1); |
+ |
+expectGTE(min, actual, msg) { |
+ if (actual >= min) return; |
+ Expect._fail(msg.replaceAll('{0}', "$min").replaceAll('{1}', "$actual")); |
+} |
+ |
+main() { |
+ int interval = 20; |
+ asyncStart(); |
+ var sw = new Stopwatch()..start(); |
+ int nextTick = 1; |
+ new Timer.periodic(ms * interval, (t) { |
+ expectGTE(nextTick, t.tick, "tick {1} before expect next tick {0}."); |
+ nextTick = t.tick + 1; // Always increment tick by at least one. |
+ int time = sw.elapsedMilliseconds; |
+ int minTime = interval * t.tick; |
+ expectGTE(minTime, time, "Actual time {1} before {0} at tick ${t.tick}"); |
+ if (t.tick > 20) { |
+ t.cancel(); |
+ asyncEnd(); |
+ } |
+ }); |
+} |