用phpunit抽象控制器中的模拟方法

I want to mock a method with PHPunit in Zend Framework 2.

The method is part of a 'AbstractController' class which is extended by the class I am testing.

The code I use to test:

 public function testAddPostAction()
{
    $this->mockBjy();
    $this->mockZFC();

    $zfcUser = $this->getMockBuilder('Common\Controller\AbstractController')->getMock();
    $zfcUser ->method('getUserId')
            ->will($this->returnValue('2'));
      $this->assertEquals(2, $zfcUser->getUserId());

    $this->dispatch('/leaverequest/add','POST', array('user' => '2','reasonforleave' => 'PHPunit','leaveRequestDates'=> '05/06/2015 - 05/15/2015'));
    $this->assertModuleName('Employment');
    $this->assertControllerName('employment\controller\leaverequest');
    $this->assertControllerClass('LeaveRequestController');
    $this->assertActionName('add');
    $this->assertMatchedRouteName('leaverequest/add');
}

The code in the abstract Controller:

protected function getUserId()
{
    return $this->zfcUserAuthentication()
                    ->getIdentity()
                    ->getId();
}

The code in the controller being tested that requires this method, look at the 2nd parameter in the method being called on the second line of the if statement ($this->getUserId()).

public function addAction()
{
    if ($this->getRequest()->isPost()) {
        $this->getServiceLocator()->get('leaveRequestService')->addLeaveRequest($this->getRequest()->getPost()->toArray(), $this->getUserId());
        $returnValue = $this->redirect()->toRoute('leaverequest/list');
    } else {
        $users = $this->getServiceLocator()->get('userService')->findAllUsers();
        $returnValue = new ViewModel(array('users' => $users));
    }
    return $returnValue;
}

I would need the mock the result of this method, but am unable to do so with the current code. The message I receive is as follows: Call to a member function getId() on a non-object in .....

Thank you in advance :)

So I have realised that mocking the abstract was a bad approach and should rather mock the leave request service called by the dispatch method. I have now tried to mock the leave request addLeaveRequestService, but the second parameter $this->getUserId is still being triggered causing the unit test to go the the getId method in the abstract controller where it fails and provides the error message " "call to member function on a non-object"