michael@0: const Cc = Components.classes;
michael@0: const Ci = Components.interfaces;
michael@0: 
michael@0: function run_test()
michael@0: {
michael@0:   var p = Cc["@mozilla.org/hash-property-bag;1"].
michael@0:           createInstance(Ci.nsIWritablePropertyBag2);
michael@0:   p.setPropertyAsInt64("a", -4000);
michael@0:   do_check_neq(p.getPropertyAsUint64("a"), -4000);
michael@0: }