michael@0: function run_test() {
michael@0:   var zReader = Components.classes["@mozilla.org/libjar/zip-reader;1"]
michael@0:                         .createInstance(Components.interfaces.nsIZipReader);
michael@0:   try {
michael@0:     zReader.open(null);
michael@0:     do_throw("Shouldn't get here!");
michael@0:   } catch (e if (e instanceof Components.interfaces.nsIException &&
michael@0:                  e.result == Components.results.NS_ERROR_NULL_POINTER)) {
michael@0:     // do nothing, this test passes
michael@0:   }
michael@0: }