How can i test an Add function on CakePHP2.0

Question

I have been told that we have to test also the functions created by Cake like add/delete...

If i have a function like this one, how can i test it if it doesn\'t have

Answer 1

public function add() {
        $this->autoRender = false;
        if ($this->request->is('post')) {
            $this->Comment->create();
            if ($this->Comment->save($this->request->data)) {
                echo json_encode(array('status' => 'ok'));
            } else {  
                echo json_encode(array('status' => 'fail'));              
            }
        }
    }