Beget question (prototypal inheritance)

beget.js

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

function test(){
  var c;

  function Parent() {
    throw 'exception';
  }

  Parent.prototype.code = Math.random();

  function Child() {}

  beget(Parent, Child);

  delete Child.prototype.code;

  c = new Child;

  return c.code === Parent.prototype.code &&
    Child.prototype !== Parent.prototype &&
    c.constructor === Child;
}

test()