fn scope_test()

in quic/s2n-quic-core/src/inet/ipv4.rs [759:805]
37 lines of code
11 McCabe index (conditional complexity)

    fn scope_test() {
        let g = produce::<[u8; 4]>().map_gen(IpV4Address::from);
        check!().with_generator(g).cloned().for_each(|subject| {
            use ip::UnicastScope::*;

            let expected = std::net::Ipv4Addr::from(subject);

            // Several IP methods are blocked behind `feature(ip)`: https://github.com/rust-lang/rust/issues/27709
            //
            // Use the `ip_network` crate to fill any gaps
            let network = ip_network::Ipv4Network::from(expected);

            match subject.unicast_scope() {
                Some(Global) => {
                    // ip_network has a bug in the `is_global` logic. Remove this once its fixed
                    // and published
                    // https://github.com/JakubOnderka/ip_network/pull/7
                    if subject.octets == [192, 0, 0, 9] || subject.octets == [192, 0, 0, 10] {
                        return;
                    }

                    assert!(network.is_global());
                }
                Some(Private) => {
                    assert!(expected.is_private() || network.is_shared_address_space());
                }
                Some(Loopback) => {
                    assert!(expected.is_loopback());
                }
                Some(LinkLocal) => {
                    assert!(expected.is_link_local());
                }
                None => {
                    assert!(
                        expected.is_broadcast()
                            || expected.is_multicast()
                            || expected.is_documentation()
                            || network.is_benchmarking()
                            || network.is_ietf_protocol_assignments()
                            || network.is_reserved()
                            || network.is_local_identification()
                            || network.is_unspecified()
                    );
                }
            }
        })
    }