Testing controller on CakePHP2.0 which calls model functions - cakephp

Question

This is my test:
public function testIncludeNumComment() {
$post = array(...stuff.....);
$result = $this->Comments->includeNumComments($post);
echo "end"; //this is not printed
$expected =1;
$this->assertEquals($result, $expected);
}
Then, my controller function is this one:
public function includeNumComments($post){
echo "printed";
$comments = $this->Comment->getNumComments($post['Post']['id']);
echo "not printed";
return $comments;
}
As you can see, this call on the controller to the model function doesn't work
$this->Comment->getNumComments($idPost);
And what is more, when i introduce an echo "hi"; at the very start of the getNumComments function inside the Comment model, it is not printed either.
It's like it didn't find the function or something like that. (but it doesn't show any error by screen during the test)
It stops there and it doesn't execute more code.
I am completely sure that function works well, it just returns the number of comments from a post. The question is: why it isn't working on the test case?
Thanks.
UPDATE:
The test setUp looks like this:
public function setUp() {
parent::setUp();
$this->Comments = new TestCommentsController();
$this->Comments->constructClasses();
}

Answer 1

$result = $this->Comments->includeNumComments($post);
this doesnt make much sense if your model is "Comment"
so change it to:
$result = $this->Comment->includeNumComments($post);

Answer 2

Check that you include the TestCommentsController like following:
App::uses('TestCommentsController', 'Controller');
Then write beforeFilter function in AppController like following:
class AppController extends Controller {
......
...
public function beforeFilter() {
// you stuff
}
}
Then add this to you controller which contains test function:
public function beforeFilter(){
parent::beforeFilter();
$this->Comments = new TestCommentsController();
$this->Comments->constructClasses();
}
.....
NOW keep going with...
public function testIncludeNumComment() {
$post = array(...stuff.....);
$result = $this->Comments->includeNumComments($post);
echo "end"; //this is not printed
$expected =1;
$this->assertEquals($result, $expected);
}