gecko-dev/dom/bindings/test/test_callback_exceptions.html

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HTML

<!DOCTYPE html>
<meta charset=utf-8>
<title>Test for ...</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
promise_test(function(t) {
var iterator = document.createNodeIterator(document, NodeFilter.SHOW_ALL, JSON.parse);
return promise_rejects(t, new SyntaxError,
Promise.resolve().then(iterator.nextNode.bind(iterator)));
}, "Trying to use JSON.parse as filter should throw a catchable SyntaxError exception even when the filter is invoked async");
promise_test(function(t) {
return promise_rejects(t, new SyntaxError, Promise.resolve('{').then(JSON.parse));
}, "Trying to use JSON.parse as a promise callback should allow the next promise to handle the resulting exception.");
</script>