gecko-dev/browser/components/sessionstore/test/browser_sessionStoreContainer.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

add_task(function* () {
  for (let i = 0; i < 3; ++i) {
    let tab = gBrowser.addTab("http://example.com/", {userContextId: i});
    let browser = tab.linkedBrowser;

    yield promiseBrowserLoaded(browser);

    let tab2 = gBrowser.duplicateTab(tab);
    let browser2 = tab2.linkedBrowser;
    yield promiseTabRestored(tab2)

    yield ContentTask.spawn(browser2, { expectedId: i }, function* (args) {
      let loadContext = docShell.QueryInterface(Ci.nsILoadContext);
      Assert.equal(loadContext.originAttributes.userContextId,
        args.expectedId, "The docShell has the correct userContextId");
    });

    yield promiseRemoveTab(tab);
    yield promiseRemoveTab(tab2);
  }
});