### Question:
UserServiceImpl implements UserService { @Override public Page<User> getAllUser() { return userDao.findAll((PageRequest) null); }  @Override Page<User> getAllUser(); @Override Page<User> getUser(int skip, int count, Order... order); @Override Page<User> getUser(Pageable page); @Override @Transactional(readOnly = false) User save(User user); @Override User read(Long userId); @Override @Transactional(readOnly = false) void delete(Long userId); @Override long getNrOfUsers(); @Override List<Post> getPostingSelectOptions();  }### Answer:
@Test public void testGetAllUser() { userService.getAllUser(); verify(userDao, times(1)).findAll((Pageable) null); }