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Bug 927349 part 24 - Add a test that empty animations still start; r=heycam

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Brian Birtles 2014-12-25 16:28:24 +09:00
parent c19abe5f2e
commit 7d5b0d8661
2 changed files with 62 additions and 0 deletions
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1
dom/animation/test/mochitest.ini
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@ -18,3 +18,4 @@ skip-if = buildapp == 'mulet'
[css-transitions/test_animation-target.html]
[css-transitions/test_element-get-animation-players.html]
skip-if = buildapp == 'mulet'
[mozilla/test_deferred_start.html]

61
dom/animation/test/mozilla/test_deferred_start.html Normal file
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@ -0,0 +1,61 @@
<!doctype html>
<meta charset=utf-8>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../testcommon.js"></script>
<div id="log"></div>
<style>
@keyframes empty { }
</style>
<script>
'use strict';
function waitForDocLoad() {
return new Promise(function(resolve, reject) {
if (document.readyState === 'complete') {
resolve();
} else {
window.addEventListener('load', resolve);
}
});
}
async_test(function(t) {
var div = addDiv(t);
var cs = window.getComputedStyle(div);
// Test that empty animations actually start.
//
// Normally we tie the start of animations to when their first frame of
// the animation is rendered. However, for animations that don't actually
// trigger a paint (e.g. because they are empty, or are animating something
// that doesn't render or is offscreen) we want to make sure they still
// start.
//
// Before we start, wait for the document to finish loading. This is because
// during loading we will have other paint events taking place which might,
// by luck, happen to trigger animations that otherwise would not have been
// triggered, leading to false positives.
//
// As a result, it's better to wait until we have a more stable state before
// continuing.
var promiseCallbackDone = false;
waitForDocLoad().then(function() {
div.style.animation = 'empty 1000s';
var player = div.getAnimationPlayers()[0];
player.ready.then(function() {
promiseCallbackDone = true;
}).catch(function() {
assert_unreached('ready promise was rejected');
});
}).then(waitForFrame).then(t.step_func(function() {
assert_true(promiseCallbackDone,
'ready promise callback was called before the next'
+ ' requestAnimationFrame callback');
t.done();
}));
}, 'AnimationPlayer.ready is resolved for an empty animation');
</script>