forked from mirrors/gecko-dev
8482b1b0ff
Differential Revision: https://phabricator.services.mozilla.com/D35698 --HG-- extra : rebase_source : 7aa723dcfa4e351c6898abd7ae9be6cf1d908423 extra : source : 1471732eca80f6fa44ae50b39c0317965cd29671
62 lines
2.3 KiB
JavaScript
62 lines
2.3 KiB
JavaScript
"use strict";
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add_task(async function test_BrowsingContext_structured_clone() {
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let browser = Services.appShell.createWindowlessBrowser(false);
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let frame = browser.document.createElement("iframe");
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browser.document.body.appendChild(frame);
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let {browsingContext} = frame;
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let sch = new StructuredCloneHolder({browsingContext});
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let deserialize = () => sch.deserialize({}, true);
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// Check that decoding a live browsing context produces the correct
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// object.
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equal(deserialize().browsingContext, browsingContext,
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"Got correct browsing context from StructuredClone deserialize");
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// Check that decoding a second time still succeeds.
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equal(deserialize().browsingContext, browsingContext,
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"Got correct browsing context from second StructuredClone deserialize");
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// Destroy the browsing context and make sure that the decode fails
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// with a DataCloneError.
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//
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// Making sure the BrowsingContext is actually destroyed by the time
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// we do the second decode is a bit tricky. We obviously have clear
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// our local references to it, and give the GC a chance to reap them.
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// And we also, of course, have to destroy the frame that it belongs
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// to, or its frame loader and window global would hold it alive.
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//
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// Beyond that, we don't *have* to reload or destroy the parent
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// document, but we do anyway just to be safe.
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//
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// Then comes the tricky bit: The WindowGlobal actors (which keep
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// references to their BrowsingContexts) require an IPC round trip to
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// be completely destroyed, even though they're in-process, so we make
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// a quick trip through the event loop, and then run the CC in order
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// to allow their (now snow-white) references to be collected.
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frame.remove();
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frame = null;
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browsingContext = null;
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browser.document.location.reload();
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browser.close();
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Cu.forceGC();
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// Give the IPC messages that destroy the actors a chance to be
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// processed.
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await new Promise(executeSoon);
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Cu.forceCC();
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// OK. We can be fairly confident that the BrowsingContext object
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// stored in our structured clone data has been destroyed. Make sure
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// that attempting to decode it again leads to the appropriate error.
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Assert.throws(deserialize, e => e.name === "DataCloneError",
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"Should get a DataCloneError when trying to decode a dead BrowsingContext");
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});
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