--- /dev/null
+'use strict';
+
+module.exports = function (t, a) {
+ a(t({}), 0, "Empty");
+ a(t({ raz: 1, dwa: null, trzy: undefined, cztery: 0 }), 4,
+ "Some properties");
+ a(t(Object.defineProperties({}, {
+ raz: { value: 'raz' },
+ dwa: { value: 'dwa', enumerable: true }
+ })), 1, "Some properties hidden");
+};