@Stateless
@Name("personListService")
public class PersonListServiceBean implements PersonListService {

    @In
    private EntityManager entityManager;

    @Logger
    private Log log;

    @In
    private PersonService personService;

    @SuppressWarnings("unchecked")
    public List<Person> selectAllPerson() {
        log.info("select all person");

        final Query query = entityManager.createQuery("from Person person");
        final List<Person> resultList = query.getResultList();

        for (Person person : resultList) {

            // do something here
            personService.saveOrUpdate(person);
        }

        return resultList;

    }

}

public class PersonListServiceBeanTest {

    private final PersonListServiceBean objectUnderTest = new PersonListServiceBean();
    private Injector injector;
    private PersonService personServiceMock;
    private InMemoryDatabaseUtil inMemoryDatabaseUtil;

    @Before
    public void setUp() {

        injector = new Injector();
        inMemoryDatabaseUtil = new InMemoryDatabaseUtil();

        // inject seam logger
        injector.injectSeamLogger(objectUnderTest);

        // create personService mock
        personServiceMock = EasyMock.createNiceMock(PersonService.class);
        // inject personService mock
        injector.injectSeamIn(objectUnderTest, "personService", personServiceMock);

        // inject entity manager
        injector.injectSeamIn(objectUnderTest, "entityManager", inMemoryDatabaseUtil.getEntityManager());

    }

    @Test
    public void testSelectAllPerson() throws Exception {
        createPersons();

        // train the personServiceMock object
        EasyMock.expect(personServiceMock.saveOrUpdate((Person)EasyMock.anyObject())).andReturn("success").anyTimes();

        replayAll();
        List<Person> all = objectUnderTest.selectAllPerson();
        verifyAll();

        Assert.assertEquals(5, all.size());

    }

    private void createPersons() throws Exception {
        for (int i = 0; i < 5; i++) {
            Person person = new Person();
            person.setFirstname("firstname" + i);
            person.setLastname("lastname" + i);
            inMemoryDatabaseUtil.saveObject(person);
        }
    }

    @After
    public void tearDown() {
        inMemoryDatabaseUtil.deleteAll();
    }

    private void verifyAll() {
        EasyMock.verify(personServiceMock);
    }

    private void replayAll() {
        EasyMock.replay(personServiceMock);
    }

}