So siehts ganz gut aus !

node_modules/es5-ext/test/object/map.js

@@ -0,0 +1,9 @@
+"use strict";
+
+module.exports = function (t, a) {
+	var obj = { 1: 1, 2: 2, 3: 3 };
+	a.deep(t(obj, function (value, key, context) {
+		a(context, obj, "Context argument");
+		return (value + 1) + key;
+	}), { 1: "21", 2: "32", 3: "43" });
+};