How to mock a repository

How can I mock database results in symfony 2, so that I can test the results of my logic? I mean, let's say I want to test the following part of some method:

if($reftab == 'ownerId')
        {
            $temp_id = $this->getDoctrine()
                       ->getManager()
                       ->getRepository('AdminBundle:Users')
                       ->find(
                           $this->getDoctrine()
                           ->getManager()
                           ->getRepository('AdminBundle:Shop')
                           ->getUserByRelation(
                               $this->getDoctrine()
                               ->getManager()
                               ->getRepository('AdminBundle:Shop')
                               ->find($reftab_id)
                               ->getShopId()
                           )
                       );
        }

To do so, I'd need to mock users and shop entities, so:

$user = $this->getMock('\Acme\AdminBundle\Entity\Users');
        $user->expects($this->once())
             ->method('getId')
             ->will($this->returnValue(1));
        $user->expects($this->once())
             ->method('getEmail')
             ->will($this->returnValue('aaa'));

        $shop = $this->getMock('\Acme\AdminBundle\Entity\Shop');
        $shop->expects($this->once())
            ->method('getId')
            ->will($this->returnValue(1));
        $user->expects($this->once())
            ->method('getEmail')
            ->will($this->returnValue('bbb'));

        $userRepository = $this->getMockBuilder('\Doctrine\ORM\EntityRepository')
            ->disableOriginalConstructor()
            ->getMock();
        $userRepository->expects($this->once())
            ->method('find')
            ->will($this->returnValue($user));

        $entityManager = $this->getMockBuilder('\Doctrine\Common\Persistence\ObjectManager')
            ->disableOriginalConstructor()
            ->getMock();
        $entityManager->expects($this->once())
            ->method('getRepository')
            ->will($this->returnValue($userRepository));

        $temp_id = $entityManager
            ->getRepository('AdminBundle:Users')
            ->find(
                $entityManager
                ->getRepository('AdminBundle:Shop')
                ->getUserByRelation(
                    $this->getDoctrine()
                         ->getManager()
                         ->getRepository('AdminBundle:Shop')
                         ->find(1)
                         ->getShopId()
                    )
            );

        $this->assertEqual(1, $temp_id);

---

The problem is however that it throws a lot of errors. find() method doesn't return the data I set in the mock object. It only returns the real existing entity record. How should I do this?