diff options
Diffstat (limited to 'docshell/test/unit/test_browsing_context_structured_clone.js')
-rw-r--r-- | docshell/test/unit/test_browsing_context_structured_clone.js | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/docshell/test/unit/test_browsing_context_structured_clone.js b/docshell/test/unit/test_browsing_context_structured_clone.js new file mode 100644 index 0000000000..d06f7aecf6 --- /dev/null +++ b/docshell/test/unit/test_browsing_context_structured_clone.js @@ -0,0 +1,68 @@ +"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" + ); +}); |