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<!DOCTYPE HTML>
<html>
<head>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
</head>
<body>
<button>Add Image</button>
<script>
/* Test to ensure http-on-image-cache-response should only be notified
* once per image
*/
SimpleTest.waitForExplicitFinish();
async function addImage() {
const newImage = document.createElement("img");
const imageLoaded = new Promise((r) => {
newImage.onload = r;
});
newImage.src = "./over.png";
document.body.appendChild(newImage);
return imageLoaded;
}
let imageCacheCallbackRunCount = 0;
const cb = SpecialPowers.wrapCallback(() => {
imageCacheCallbackRunCount += 1;
});
SpecialPowers.addObserver(cb, "http-on-image-cache-response");
async function runTest() {
await addImage();
SimpleTest.ok(imageCacheCallbackRunCount == 0, "first load of over.png shouldn't be cached");
await addImage();
SimpleTest.ok(imageCacheCallbackRunCount == 1, "second load of over.png should be cached");
await addImage();
await addImage();
await addImage();
SimpleTest.ok(imageCacheCallbackRunCount == 1, "further loads of over.png shouldn't be notified");
SimpleTest.finish();
}
runTest();
</script>
</body>
</html>
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