--- /dev/null
+'use strict';
+
+module.exports = function (t, a) {
+ var x = {}, y = Object.create(null);
+ a(t(x), null, "Normal: Empty");
+ a(t(y), null, "Null extension: Empty");
+ x.foo = 'raz';
+ x.bar = 343;
+ a(['foo', 'bar'].indexOf(t(x)) !== -1, true, "Normal");
+ y.elo = 'foo';
+ y.mar = 'wew';
+ a(['elo', 'mar'].indexOf(t(y)) !== -1, true, "Null extension");
+};