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