beget question

beget.js

function beget(parent, child){
  // put code here to make test() return true
};

function test(){
  function Parent(){
    throw 'exception';
  };

  Parent.prototype = {code: Math.random()};
  function Child(){};
  beget(Parent, Child);
  delete Child.prototype.code;
  return new Child().code === Parent.prototype.code &&
    Child.prototype !== Parent.prototype;
}