@Test
public void should_recognise_ipv4_literal() {

    assertThat(subject.isLiteralIpAddress("10.0.0.10")).hasValue("10.0.0.10");
    assertThat(subject.isLiteralIpAddress("127.0.0.1")).hasValue("127.0.0.1");
    assertThat(subject.isLiteralIpAddress("567.0.0.1")).hasValue("567.0.0.1"); // true in this implementation
}