CakePHP controller testing: Mocking models and test method - unit-testing

Question

I am a beginner in unit testing in CakePHP. My version of CakePHP is 2.5.2 and I am using cake test suite 2.5.2. I want to do controller testing. I have tried all methods given in cookbook. I think this is too much complex code for given example in cookbook. I have customised routes for my application. I can invoke method showed below by calling : http://localhost/api/v1/networks/
This is the simplest method in my controller. How can i start testing on this method and what mocks should i need?
public function index() {
if (!$this->request->is('Get')) {
throw new MethodNotAllowedException(__('HTTP request Method Not allowed..'));
}
$networks = $this->Network->UserNetwork->getNetworks($this->current_user);
$returnObject = array('message' => 'Networks found successfully',
'data' => $networks
);
return $this->_sendResponse($returnObject, 200);
}
what i have tried so far is:
<?php
App::uses('NetworksController', 'Controller');
class NetworksControllerTestCase extends ControllerTestCase {
public $fixtures = array(
'app.network',
);
public function setUp() {
parent::setUp(); // TODO: Change the autogenerated stub
$this->Network = $this->generate('Networks',
array('models' => array('network','usernetwork' => array('getNetworks'))));
}
public function testIndex() {
$result = $this->testAction('/api/v1/networks/index', array('return' => 'vars'));
debug($result);
}}