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-rw-r--r--docshell/test/unit/test_browsing_context_structured_clone.js68
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diff --git a/docshell/test/unit/test_browsing_context_structured_clone.js b/docshell/test/unit/test_browsing_context_structured_clone.js
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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"
+ );
+});