compact.js 351 Bytes
"use strict";

module.exports = function (t, a) {
	var x = {}, y = {}, z;
	z = t(x);
	a.not(z, x, "Returns different object");
	a.deep(z, {}, "Empty on empty");

	x = { foo: "bar", a: 0, b: false, c: "", d: "0", e: null, bar: y, elo: undefined };
	z = t(x);
	a.deep(z, { foo: "bar", a: 0, b: false, c: "", d: "0", bar: y }, "Cleared null values");
};