@Test
public void should_not_recognise_ipv4_literal() {

    assertThat(subject.isLiteralIpAddress(".10.0.0.24")).isEmpty();
    assertThat(subject.isLiteralIpAddress("a10.0.0.24")).isEmpty();
    assertThat(subject.isLiteralIpAddress("10.0.0.24.b")).isEmpty();
    assertThat(subject.isLiteralIpAddress("10.0.0/24")).isEmpty();
    assertThat(subject.isLiteralIpAddress("127")).isEmpty();
    assertThat(subject.isLiteralIpAddress("")).isEmpty();
}