The Tor Browser / file revision

 function run_test()

 {

     var failures = false;

     var ccManager =

 	Components.classes["@mozilla.org/charset-converter-manager;1"]

 	.getService(Components.interfaces.nsICharsetConverterManager);

     var decoderList = ccManager.getDecoderList();

     while (decoderList.hasMore()) {

 	var decoder = decoderList.getNext();

 	try {

 	    var langGroup = ccManager.getCharsetLangGroupRaw(decoder);

 	} catch(e) {

 	    dump("no langGroup for " + decoder + "\n");

 	    failures = true;

 	}

     }

     if (failures) {

 	do_throw("missing langGroups");

     }

 }