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"use strict";
add_task(async function test_BrowsingContext_structured_clone() {
let browser = Services.appShell.createWindowlessBrowser(false);
let frame = browser.document.createElement("iframe");
await new Promise(r => {
frame.onload = () => r();
browser.document.body.appendChild(frame);
});
let { browsingContext } = frame;
let sch = new StructuredCloneHolder({ browsingContext });
let deserialize = () => sch.deserialize({}, true);
// Check that decoding a live browsing context produces the correct
// object.
equal(
deserialize().browsingContext,
browsingContext,
"Got correct browsing context from StructuredClone deserialize"
);
// Check that decoding a second time still succeeds.
equal(
deserialize().browsingContext,
browsingContext,
"Got correct browsing context from second StructuredClone deserialize"
);
// Destroy the browsing context and make sure that the decode fails
// with a DataCloneError.
//
// Making sure the BrowsingContext is actually destroyed by the time
// we do the second decode is a bit tricky. We obviously have clear
// our local references to it, and give the GC a chance to reap them.
// And we also, of course, have to destroy the frame that it belongs
// to, or its frame loader and window global would hold it alive.
//
// Beyond that, we don't *have* to reload or destroy the parent
// document, but we do anyway just to be safe.
//
frame.remove();
frame = null;
browsingContext = null;
browser.document.location.reload();
browser.close();
// We will schedule a precise GC and do both GC and CC a few times, to make
// sure we have completely destroyed the WindowGlobal actors (which keep
// references to their BrowsingContexts) in order
// to allow their (now snow-white) references to be collected.
await schedulePreciseGCAndForceCC(3);
// OK. We can be fairly confident that the BrowsingContext object
// stored in our structured clone data has been destroyed. Make sure
// that attempting to decode it again leads to the appropriate error.
Assert.throws(
deserialize,
e => e.name === "DataCloneError",
"Should get a DataCloneError when trying to decode a dead BrowsingContext"
);
});
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