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DOM: Add basic moveBefore() MutationObserver tests #49846

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Dec 26, 2024
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DOM: Add basic moveBefore() MutationObserver tests #49846

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52 changes: 52 additions & 0 deletions dom/nodes/moveBefore/tentative/mutation-observer.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<title>slotchanged event</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>

<div id=oldParent>
<p id=target></p>
</div>
<div id=newParent></div>

<script>
async function runTest(oldParent, target, newParent) {
const observations = [];
const observer = new MutationObserver(mutationList => observations.push(mutationList));

observer.observe(oldParent, {childList: true});
observer.observe(target, {childList: true});
observer.observe(newParent, {childList: true});

newParent.moveBefore(target, null);

// Wait for microtasks to settle.
await new Promise(resolve => queueMicrotask(resolve));

assert_equals(observations.length, 1, "MutationObserver has emitted a single mutation list");
assert_equals(observations[0].length, 2, "Mutation list has two MutationRecords");

const removalRecord = observations[0][0];
const insertionRecord = observations[0][1];
assert_equals(removalRecord.target, oldParent, "removalRecord target is correct");
assert_equals(removalRecord.removedNodes[0], target, "removedNodes contains the moved node");
assert_equals(insertionRecord.target, newParent, "insertionRecord target is correct");
assert_equals(insertionRecord.addedNodes[0], target, "addedNodes contains the moved node");
observer.disconnect();
}

promise_test(async t => {
await runTest(oldParent, target, newParent);
}, "[Connected move] MutationObserver removal + insertion is tracked by moveBefore()");

promise_test(async t => {
const oldParent = document.createElement('div');
const target = document.createElement('p');
const newParent = document.createElement('div');
// We must append `newParent` as well, since the origin and destination nodes
// must share the same shadow-including root.
oldParent.append(target, newParent);

await runTest(oldParent, target, newParent);
}, "[Disconnected move] MutationObserver removal + insertion is tracked by moveBefore()");
</script>