How do I test an HTML Email Template on CakePHP?

cake_email.php

function email_test()
{
    $this->layout = 'email/html/default';
    $user = $this->User->findById(1);
    $this->set('name', $user['User']['firstname']);
    $this->set('email_heading', 'Welcome to My App');
    return $this->render('/elements/email/html/welcome');
}

// Source http://stackoverflow.com/questions/12501561/how-do-i-test-an-html-email-template-on-cakephp