freeze-test.js

var a = [];
Object.freeze(a);
a.push('foo');

if (a.length === 1) {
  console.log("FAIL Object.freeze() with Array");
} else {
  console.log("PASS Object.freeze() with Array");
}

var o = {};
Object.freeze(o);
o.foo = 'bar';

if (o.foo === 'bar') {
  console.log("FAIL Object.freeze() on Object");
} else {
  console.log("PASS Object.freeze() on Object");
}

phantom.exit();