michael@0: const Cu = Components.utils;
michael@0: 
michael@0: function run_test() {
michael@0:   // Make sure Components.utils gets its |this| fixed up.
michael@0:   var isXrayWrapper = Components.utils.isXrayWrapper;
michael@0:   do_check_true(!isXrayWrapper({}), "Didn't throw");
michael@0: 
michael@0:   // Even for classes without |this| fixup, make sure that we don't crash.
michael@0:   var isSuccessCode = Components.isSuccessCode;
michael@0:   try { isSuccessCode(Components.results.NS_OK); } catch (e) {};
michael@0: }