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Test Info:
- Manifest: dom/ipc/tests/browser.toml
let dir = getChromeDir(getResolvedURI(gTestPath));
dir.append("file_dummy.html");
const uriString = Services.io.newFileURI(dir).spec;
add_task(async function () {
await BrowserTestUtils.withNewTab(
async function (browser) {
// Override the browser's `prepareToChangeRemoteness` so that we can delay
// the process switch for an indefinite amount of time. This will allow us
// to control the timing of the resolve call to trigger the bug.
let prepareToChangeCalled = Promise.withResolvers();
let finishSwitch = Promise.withResolvers();
let oldPrepare = browser.prepareToChangeRemoteness;
browser.prepareToChangeRemoteness = async () => {
prepareToChangeCalled.resolve();
await oldPrepare.call(browser);
await finishSwitch.promise;
};
// Begin a process switch, which should cause `prepareToChangeRemoteness` to
// be called.
// NOTE: This used to avoid BrowserTestUtils.loadURI, as that call would
// previously eagerly perform a process switch meaning that the interesting
// codepath wouldn't be triggered. Nowadays the process switch codepath
// always happens during navigation as required by this test.
info("Beginning process switch into file URI process");
let browserLoaded = BrowserTestUtils.browserLoaded(browser);
BrowserTestUtils.startLoadingURIString(browser, uriString);
await prepareToChangeCalled.promise;
// The tab we opened is now midway through process switching. Open another
// browser within the same tab, and immediately close it after the load
// finishes.
info("Creating new tab loaded in file URI process");
let fileProcess;
let browserParentDestroyed = Promise.withResolvers();
await BrowserTestUtils.withNewTab(
uriString,
async function (otherBrowser) {
let remoteTab = otherBrowser.frameLoader.remoteTab;
fileProcess = remoteTab.contentProcessId;
info("Loaded test URI in pid: " + fileProcess);
browserParentDestroyed.resolve(
TestUtils.topicObserved(
"ipc:browser-destroyed",
subject => subject === remoteTab
)
);
}
);
await browserParentDestroyed.promise;
// This browser has now been closed, which could cause the file content
// process to begin shutting down, despite us process switching into it.
// We can now allow the process switch to finish, and wait for the load to
// finish as well.
info("BrowserParent has been destroyed, finishing process switch");
finishSwitch.resolve();
await browserLoaded;
info("Load complete");
is(
browser.frameLoader.remoteTab.contentProcessId,
fileProcess,
"Should have loaded in the same file URI process"
);
}
);
});