@Test
public void should_not_recognise_ipv6_literal() {

    assertThat(subject.isLiteralIpAddress("dbg::")).isEmpty();
    assertThat(subject.isLiteralIpAddress("db8:dead:beef::/26")).isEmpty();
    assertThat(subject.isLiteralIpAddress("127")).isEmpty();
    assertThat(subject.isLiteralIpAddress("")).isEmpty();
}