unit testing AuthComponent,CakePhp

I am using the following code to test the login action in UsersController-

public function testLogin() {      $data = array('User' => array(                  'username' => 'hello',                  'password' => '411'                      )              );      $this->Users = $this->generate('Users',array('components'=> array('Auth','Session')));      $this->Users->Auth->staticExpects($this->once())                          ->method('user')                          ->with('id');      $this->testAction('/users/login', array('data' => $data, 'method' => 'post'));    }

and the fixture is-

class UserFixture extends CakeTestFixture { public $import = array('model' => 'User', 'records' => true, 'connection' => 'fixture');

}

and action is-

public function login() {
   
            if($this->request->is('post')) {
                if($this->Auth->login()) {
                    $this->redirect($this->Auth->redirect());
                } else {
                    return false;
                    $this->Session->setFlash(__('Wrong Username Or Password,Please Try Again'));
                }
            }
        }

It always showing

Expectation failed for method name is equal to when invoked 1 time(s). Method was expected to be called 1 times, actually called 0 times.

What is the problem?Cant find any solution,and the reason also.Please help.

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