LayoutTests/http/tests/ipc/write-web-archive-frame-ancestry-check.html

<!-- webkit-test-runner [ IPCTestingAPIEnabled=true SiteIsolationEnabled=true ] -->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="iframe"></iframe>
<script>
const WriteWebArchiveToPasteBoardResult = {
    Success: 0,
    FailureDueToInvalidFrameIdentifiers: 1,
    FailureOther: 2,
};

promise_test(async t => {
    let resultPromise = new Promise((resolve) => {
        onmessage = (e) => {
            if (e.data && e.data.getParentFrameID) {
                e.source.postMessage({ parentFrameID: IPC.frameID[0].toString() }, '*');
                return;
            }
            resolve(e.data);
        };
        t.step_timeout(() => resolve({ timeout: true }), 5000);
    });
    document.getElementById('iframe').src = 'http://localhost:8000/ipc/resources/write-web-archive-frame-ancestry-check-iframe.html';
    let reply = await resultPromise;
    if (reply.skipped)
        return;
    assert_false(!!reply.timeout, 'iframe did not report a result before timeout');
    assert_equals(reply.result, WriteWebArchiveToPasteBoardResult.FailureDueToInvalidFrameIdentifiers,
        'WriteWebArchiveToPasteBoard should reject a payload that names a non-descendant frame as a remote subframe');
}, 'WriteWebArchiveToPasteBoard rejects cross-process remote frame ids that are not subtree descendants of the root frame');
</script>