The Tor Browser / file revision

 const Cu = Components.utils;

 function run_test() {

   // Make sure we don't throw for primitive values.

   var result = "threw";

   try { result = XPCNativeWrapper.unwrap(2); } catch (e) {}

   do_check_eq(result, 2);

   result = "threw";

   try { result = XPCNativeWrapper(2); } catch (e) {}

   do_check_eq(result, 2);

   // Make sure that we can waive on a non-Xrayable object, and that we preserve

   // transitive waiving behavior.

   var sb = new Cu.Sandbox('http://www.example.com', { wantGlobalProperties: ["XMLHttpRequest"] });

   Cu.evalInSandbox('this.xhr = new XMLHttpRequest();', sb);

   Cu.evalInSandbox('this.jsobj = {mynative: xhr};', sb);

   do_check_true(!Cu.isXrayWrapper(XPCNativeWrapper.unwrap(sb.xhr)));

   do_check_true(Cu.isXrayWrapper(sb.jsobj.mynative));

   do_check_true(!Cu.isXrayWrapper(XPCNativeWrapper.unwrap(sb.jsobj).mynative));

   // Test the new Cu API.

   var waived = Cu.waiveXrays(sb.xhr);

   do_check_true(!Cu.isXrayWrapper(waived));

   do_check_true(Cu.isXrayWrapper(Cu.unwaiveXrays(waived)));

 }