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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Test FinalizationRegistry tracks its incumbent global</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="application/javascript">
let resolvePromise, rejectPromise;
async function runTest(global, callback) {
let fr = new global.FinalizationRegistry(callback);
fr.register({}, undefined);
SpecialPowers.DOMWindowUtils.garbageCollect();
let promise = new Promise((resolve, reject) => {
resolvePromise = resolve;
rejectPromise = reject;
});
return promise;
}
function receiveMessage(event) {
resolvePromise(event.source.sourceName);
}
async function go() {
// This test uses FinalizationRegistry to trigger a callback and reports
// the incumbent global in the callback using postMessage. In all cases
// the author function that scheduled the callback is runTest(), so the
// incumbent global should be the main window.
SimpleTest.waitForExplicitFinish();
window.sourceName = "main";
window.addEventListener("message", receiveMessage, false);
let other = window.frames[0];
other.sourceName = "other";
other.addEventListener("message", receiveMessage, false);
is(await runTest(window, v => window.postMessage(v)), "main");
is(await runTest(window, window.postMessage.bind(window)), "main");
is(await runTest(other, v => other.postMessage(v)), "main");
is(await runTest(other, other.postMessage.bind(other)), "main");
is(await runTest(window, v => other.postMessage(v)), "main");
is(await runTest(window, other.postMessage.bind(other)), "main");
is(await runTest(other, v => window.postMessage(v)), "main");
is(await runTest(other, window.postMessage.bind(window)), "main");
SimpleTest.finish();
}
</script>
</head>
<body onload="go()">
<div style="display: none">
<!-- A subframe so we have another global to work with -->
<iframe></iframe>
</div>
</body>
</html>
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