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Bug 1378394 P2 Test that setInterval() is calculated based on start of last callback. r=farre

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This commit is contained in:
Ben Kelly 2017-07-06 07:01:40 -07:00
parent fd76c2a146
commit bc57416938
2 changed files with 58 additions and 0 deletions
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1
dom/base/test/mochitest.ini
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@ -764,6 +764,7 @@ support-files =
file_js_cache_save_after_load.js
file_js_cache_syntax_error.html
file_js_cache_syntax_error.js
[test_setInterval_from_start.html]
[test_setInterval_uncatchable_exception.html]
skip-if = debug == false
[test_settimeout_extra_arguments.html]

57
dom/base/test/test_setInterval_from_start.html Normal file
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@ -0,0 +1,57 @@
<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1252268
-->
<head>
<meta charset="utf-8">
<title>Test for Bug 1378394</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1378394">Mozilla Bug 1378394</a>
<script>
SimpleTest.waitForExplicitFinish();
// Some of our platforms are quite slow. Use very large time values to
// try to avoid raciness.
const burnTimeMS = 5000;
const intervalTimeMS = 10000;
// The overall interval should include our callback "burn time". So we
// expect the delay to be the remaining time.
const expectedDelayMS = intervalTimeMS - burnTimeMS;
// Allow some margin for error because of slow test platforms.
const allowedMarginMS = burnTimeMS / 2;
let id;
let lastEndTime;
function interval()
{
let start = performance.now();
if (lastEndTime !== undefined) {
let delta = start - lastEndTime;
ok(delta <= expectedDelayMS + allowedMarginMS,
'interval should not fire too late');
ok(delta >= expectedDelayMS - allowedMarginMS,
'interval should not fire too early');
clearInterval(id);
SimpleTest.finish();
return;
}
while((performance.now() - start) < burnTimeMS);
lastEndTime = performance.now();
}
id = setInterval(interval, intervalTimeMS);
</script>
</body>
</html>