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Unified Diff: tests/lib_2/async/periodic_timer3_test.dart

Issue 3003853002: Add ticks counter to Timer. (Closed)
Patch Set: Test that tick increments by more than one Created 3 years, 4 months ago
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Index: tests/lib_2/async/periodic_timer3_test.dart
diff --git a/tests/lib_2/async/periodic_timer3_test.dart b/tests/lib_2/async/periodic_timer3_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0434e81413235085562218e06c4f622f5a5c6497
--- /dev/null
+++ b/tests/lib_2/async/periodic_timer3_test.dart
@@ -0,0 +1,37 @@
+// 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.
+
+library timer_test;
+
+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}.");
+ int time = sw.elapsedMilliseconds;
+ int minTime = interval * t.tick;
+ expectGTE(minTime, time, "Actual time {1} before {0} at tick ${t.tick}");
+ while (sw.elapsedMilliseconds < time + 3 * interval) {
+ // idle.
+ }
+ nextTick = t.tick + 2; // At least increment by two, probably more.
+ if (t.tick > 20) {
+ t.cancel();
+ asyncEnd();
+ }
+ });
+}

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