The Tor Browser / file revision

 Cu.import("resource://services-sync/util.js");

 const base64url =

   "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";

 function run_test() {

   _("Make sure makeGUID makes guids of the right length/characters");

   _("Create a bunch of guids to make sure they don't conflict");

   let guids = [];

   for (let i = 0; i < 1000; i++) {

     let newGuid = Utils.makeGUID();

     _("Generated " + newGuid);

     // Verify that the GUID's length is correct, even when it's URL encoded.

     do_check_eq(newGuid.length, 12);

     do_check_eq(encodeURIComponent(newGuid).length, 12);

     // Verify that the GUID only contains base64url characters

     do_check_true(Array.every(newGuid, function(chr) {

       return base64url.indexOf(chr) != -1;

     }));

     // Verify that Utils.checkGUID() correctly identifies them as valid.

     do_check_true(Utils.checkGUID(newGuid));

     // Verify uniqueness within our sample of 1000. This could cause random

     // failures, but they should be extremely rare. Otherwise we'd have a

     // problem with GUID collisions.

     do_check_true(guids.every(function(g) { return g != newGuid; }));

     guids.push(newGuid);

   }

   _("Make sure checkGUID fails for invalid GUIDs");

   do_check_false(Utils.checkGUID(undefined));

   do_check_false(Utils.checkGUID(null));

   do_check_false(Utils.checkGUID(""));

   do_check_false(Utils.checkGUID("blergh"));

   do_check_false(Utils.checkGUID("ThisGUIDisWayTooLong"));

   do_check_false(Utils.checkGUID("Invalid!!!!!"));

 }