public abstract String dn();
@Test
    void dn() {
        final LDAPEntry entry = LDAPEntry.builder()
                .dn("cn=jane,ou=people,dc=example,dc=com")
                .base64UniqueId(Base64.encode("unique-id"))
                .addAttribute("foo", "bar")
                .build();

        assertThat(entry.dn()).isEqualTo("cn=jane,ou=people,dc=example,dc=com");
    }