Gist do post "Usando PHPUnit no Codeigniter via Hooks" Link: http://willmendesnetoprojects.wordpress.com/2013/02/24/usando-phpunit-no-codeigniter-via-hooks/

PostTest.php

<?php

class PostTest extends PHPUnit_Framework_TestCase
{
    private $CI;

    public function setUp()
    {
        $this->CI = &get_instance();
        $this->CI->load->database('testing');
    }

    public function testGetsAllPosts()
    {
        $this->CI->load->model('post');
        $posts = $this->CI->post->getAll();
        $this->assertEquals(0, count($posts));
    }
}