Hibernate optimistic locking test

I know this has been asked before, but I'm trying to test Hibernate's optimistic locking feature using a version field.

I've seen the following answer which outlines how to test this Hibernate 3 : optimistic locking unit test.

Can someone confirm whether or not my test is doing this correctly as I'm not getting the StaleObjectStateException that I'm expecting to see.

@Test(expected = StaleObjectStateException.class)
public void optimisticLockingTest() {
    DummyEntity entity= new DummyEntity("name");
    entityDao.persist(entity);

    entityDao.detach(entity);
    entity.setName("new name");

    // Get new instance of the same entity
    final DummyEntity newEntity = entityDao.findById(entity.getId());
    newEntity.setName("Different name");
    entityDao.persist(newEntity);

    entity = entityDao.merge(entity );
    entityDao.persist(entity);
}