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Test Info:

<!DOCTYPE html>
<html>
<!--
-->
<head>
<title>Bug 1308069</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
</head>
<body>
<script class="testbody" type="text/javascript">
function testClearPendingErrorEvent() {
return new Promise(function(aResolve, aReject) {
var hasErrorEvent = false;
var imgTarget = new Image();
var imgForChangingTargetSrc = new Image();
// Queue an error event for changing imgTarget's src.
imgForChangingTargetSrc.src = '';
imgForChangingTargetSrc.onerror = function() {
// This clears imgTarget's pending error event.
imgTarget.src = 'data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96"><path d="M10,10L32,90L90,32z" fill="lightgreen"/></svg>';
// Queue an error event for checking and resolving promise.
var imgForCheckingAndResolvingPromise = new Image();
imgForCheckingAndResolvingPromise.src = '';
imgForCheckingAndResolvingPromise.onerror = function() {
ok(!hasErrorEvent,
'Should not receive an error event since the pending error event ' +
'should be cleared before it fired');
aResolve();
};
};
// Setting src to empty string queues an error event.
imgTarget.src = '';
imgTarget.onerror = function() {
hasErrorEvent = true;
};
});
}
function testReplacePendingErrorEvent() {
return new Promise(function(aResolve) {
var numOfErrorEvent = 0;
var imgTarget = new Image();
var imgForChangingTargetSrc = new Image();
// Queue an error event for changing imgTarget's src.
imgForChangingTargetSrc.src = '';
imgForChangingTargetSrc.onerror = function() {
// This clears pending error event and fires a new one.
imgTarget.src = '';
// Queue an error event for checking and resolving promise.
var imgForCheckingAndResolvingPromise = new Image();
imgForCheckingAndResolvingPromise.src = '';
imgForCheckingAndResolvingPromise.onerror = function() {
is(numOfErrorEvent, 1,
'Should only receive one error event since the first pending error ' +
'event should be cleared before it fired');
aResolve();
};
};
// Setting src to empty string queues an error event.
imgTarget.src = '';
imgTarget.onerror = function() {
numOfErrorEvent++;
};
});
}
SimpleTest.waitForExplicitFinish();
Promise.resolve()
.then(() => testClearPendingErrorEvent())
.then(() => testReplacePendingErrorEvent())
.catch((err) => ok(false, "promise rejected: " + err))
.then(() => SimpleTest.finish());
</script>
</body>
</html>