The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 function test() {

   let ss = Cc["@mozilla.org/browser/sessionstore;1"]

                      .getService(Ci.nsISessionStore);

   let assertVisibilityDataEquals = function (val, msg) {

     is(ss.getWindowValue(window, TabView.VISIBILITY_IDENTIFIER), val, msg);

   }

   waitForExplicitFinish();

   ss.setWindowValue(window, window.TabView.VISIBILITY_IDENTIFIER, "null");

   assertVisibilityDataEquals("null", "we start with <null>");

   showTabView(function () {

     assertVisibilityDataEquals("true", "after showing visibility data is <true>");

     hideTabView(function () {

       assertVisibilityDataEquals("false", "after hiding visibility data is <false>");

       finish();

     });

   });

 }