The Tor Browser / file revision

 function run_test() { 

   // this is a hack to skip the rest of the code on non-Mac platforms, 

   // since #ifdef is not available to xpcshell tests...

   if (!("nsILocalFileMac" in Components.interfaces))

     return;

   // OK, here's the real part of the test:

   // make sure these two test bundles are recognized as bundles (or "packages") 

   var keynoteBundle = do_get_file("data/presentation.key");

   var appBundle = do_get_file("data/SmallApp.app");

   do_check_true(keynoteBundle instanceof Components.interfaces.nsILocalFileMac);

   do_check_true(appBundle instanceof Components.interfaces.nsILocalFileMac);

   do_check_true(keynoteBundle.isPackage());

   do_check_true(appBundle.isPackage());

 }