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Attempt to make the test for bug 629838 less sensitive to OS-triggered paints and CPU load; r=cjones a=test

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--HG--
extra : rebase_source : e525d5eb2a40533209d21f84a466f395243a756a
This commit is contained in:
kevingadd 2011-02-03 22:12:06 -08:00
parent 19db525f87
commit f60280ba8c
1 changed files with 20 additions and 8 deletions
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28
layout/base/tests/test_bug629838.html
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@ -23,7 +23,6 @@ var initialPaintCount, afterPaintCount;
var color = 0;
function onAfterPaint () {
ok(true, "OnAfterPaint");
afterPaintCount += 1;
}
@ -33,18 +32,30 @@ function startTest() {
initialPaintCount = window.mozPaintCount;
window.addEventListener("MozAfterPaint", onAfterPaint, true);
doBackgroundFlicker();
}, 1000);
}, 500);
}
document.addEventListener("DOMContentLoaded", startTest, true);
// Unfortunately we cannot reliably assert that mozPaintCount and afterPaintCount increment perfectly
// in sync, because they can diverge in the presence of OS-triggered paints or system load.
// Instead, we wait for mozPaintCount to increase by a set amount, and then assert that we got a
// minimum number of MozAfterPaint events. This number needs to be high enough to ensure that this test
// will fail if empty transactions are not triggering MozAfterPaint, but low enough to allow the test to
// pass even if the operating system triggers extra repaints or the browser is running slowly.
// If this test still fails occasionally, examine the output to see whether minimumAfterPaints needs to be
// adjusted down or whether you are dealing with a different issue.
const mozPaintsToWait = 50;
const minimumAfterPaintsToPass = 37;
function doPluginFlicker() {
ok(true, "Plugin color iteration " + color +
", afterpaint count: " + afterPaintCount +
", mozpaint count: " + window.mozPaintCount);
if ((afterPaintCount >= window.mozPaintCount - initialPaintCount) &&
(afterPaintCount > 20)) {
ok(true, "Got enough paints from plugin color changes");
var mozPaints = (window.mozPaintCount - initialPaintCount);
if (mozPaints >= mozPaintsToWait) {
ok(true, "mozPaintCount incremented enough from plugin color changes.");
ok(afterPaintCount >= minimumAfterPaintsToPass, "Got MozAfterPaint event " + afterPaintCount + " time(s).");
SimpleTest.finish();
return;
}
@ -63,9 +74,10 @@ function doBackgroundFlicker() {
ok(true, "Background color iteration " + color +
", afterpaint count: " + afterPaintCount +
", mozpaint count: " + window.mozPaintCount);
if ((afterPaintCount >= window.mozPaintCount - initialPaintCount) &&
(afterPaintCount > 20)) {
ok(true, "Got enough paints from background color changes");
var mozPaints = (window.mozPaintCount - initialPaintCount);
if (mozPaints >= mozPaintsToWait) {
ok(true, "mozPaintCount incremented enough from background color changes.");
ok(afterPaintCount >= minimumAfterPaintsToPass, "Got MozAfterPaint event " + afterPaintCount + " time(s).");
afterPaintCount = 0;
initialPaintCount = window.mozPaintCount;
doPluginFlicker();