public List<User> userDTOsToUsers(List<AdminUserDTO> userDTOs) {
        return userDTOs.stream().filter(Objects::nonNull).map(this::userDTOToUser).toList();
    }
@Test
    void userDTOsToUsersMapWithNullAuthoritiesStringShouldReturnUserWithEmptyAuthorities() {
        userDto.setAuthorities(null);

        List<AdminUserDTO> usersDto = new ArrayList<>();
        usersDto.add(userDto);

        List<User> users = userMapper.userDTOsToUsers(usersDto);

        assertThat(users).isNotEmpty().size().isEqualTo(1);
        assertThat(users.get(0).getAuthorities()).isNotNull();
        assertThat(users.get(0).getAuthorities()).isEmpty();
    }