--- /dev/null
+'use strict';
+
+module.exports = function (t, a) {
+ var o = { first: 1, second: 4 }, r1, r2;
+ o = Object.create(o, {
+ third: { value: null }
+ });
+ o.first = 2;
+ o = Object.create(o);
+ o.fourth = 3;
+
+ r1 = t(o);
+ r1.sort();
+ r2 = ['first', 'second', 'third', 'fourth']
+ .concat(Object.getOwnPropertyNames(Object.prototype));
+ r2.sort();
+ a.deep(r1, r2);
+};