iptrie 0.11.1

IPv4/v6 prefixes lookup structures (based on tries)
Documentation 
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use super::*;
use ipnet::Ipv6Net;
use rand::distributions::*;
use rand::*;
use std::collections::HashSet;

#[test]
fn slot_mask() {
    assert_eq!(0, u64::bitmask(0));
    assert_eq!(1 << 63, u64::bitmask(1));
    assert_eq!(u64::MAX, u64::bitmask(64));
}

#[test]
fn slot_root() {
    assert_eq!(u32::from(Ipv4Prefix::root().network()), 0);
    assert_eq!(Ipv4Prefix::root().len(), 0);

    assert_eq!(u128::from(Ipv6Prefix::root().network()), 0);
    assert_eq!(Ipv6Prefix::root().len(), 0);
    assert_eq!(u128::from(Ipv6NetPrefix::root().network()), 0);
    assert_eq!(Ipv6Prefix::root().len(), 0);
}

#[test]
fn parse_errors() {
    assert_eq!(
        "1::/12".parse::<Ipv4Prefix>(),
        Err(IpPrefixError::AddrParseError)
    );
    assert_eq!(
        "1.1.1.1/12".parse::<Ipv6NetPrefix>(),
        Err(IpPrefixError::AddrParseError)
    );
}

#[test]
fn prefix_ipv4_trunc() {
    let mut rng = thread_rng();
    let len = Uniform::<u8>::from(0..=32);
    let addr = Uniform::<u32>::from(0..=u32::MAX);

    (0..10_000).for_each(|_| {
        let addr = Ipv4Addr::from(addr.sample(&mut rng));
        let len = len.sample(&mut rng);
        let ipnet = Ipv4Prefix::new(addr, len).unwrap();
        assert_eq!(ipnet.bitslot_trunc(), ipnet.bitslot() & ipnet.bitmask())
    })
}

fn prefix_ipv6_trunc<P>()
where
    P: IpPrefix<Addr = Ipv6Addr> + TryFrom<Ipv6Net>,
    <P as TryFrom<Ipv6Net>>::Error: Debug,
{
    let mut rng = thread_rng();
    let len = Uniform::<u8>::from(0..=P::MAX_LEN);
    let addr = Uniform::<u128>::from(0..=u128::MAX);

    (0..10_000).for_each(|_| {
        let addr = Ipv6Addr::from(addr.sample(&mut rng));
        let len = len.sample(&mut rng);
        let ipnet = P::try_from(Ipv6Net::new(addr, len).unwrap()).unwrap();
        assert_eq!(ipnet.bitslot_trunc(), ipnet.bitslot() & ipnet.bitmask())
    })
}

#[test]
fn prefix_ipv6_128_trunc() {
    prefix_ipv6_trunc::<Ipv6Prefix>()
}
#[test]
fn prefix_ipv6_64_trunc() {
    prefix_ipv6_trunc::<Ipv6NetPrefix>()
}

#[test]
fn prefix_eq() {
    let mut rng = thread_rng();
    let len = Uniform::<u8>::from(0..=128);
    let addr = Uniform::<u128>::from(0..=u128::MAX);

    (0..10_000).for_each(|_| {
        let addr = Ipv6Addr::from(addr.sample(&mut rng));
        let len = len.sample(&mut rng);
        let ipnet = Ipv6Prefix::new(addr, len).unwrap();
        let ipnet2 = Ipv6Net::new(addr, len).unwrap();
        assert_eq!(ipnet.network(), ipnet2.network());
        if ipnet.len() <= 64 {
            let ipnet3 = Ipv6NetPrefix::try_from(ipnet).unwrap();
            assert!(ipnet3.covers_equally(&ipnet));
            assert!(ipnet.covers_equally(&ipnet3));
        } else {
            assert_eq!(
                Ipv6NetPrefix::try_from(ipnet),
                Err(IpPrefixError::PrefixLenError)
            )
        }
    })
}

#[test]
fn prefix_cover() {
    let mut rng = thread_rng();
    let len = Uniform::<u8>::from(0..=64);
    let addr = Uniform::<u128>::from(0..=u128::MAX);

    (0..10_000).for_each(|_| {
        let addr = Ipv6Addr::from(addr.sample(&mut rng));
        let l1 = len.sample(&mut rng);
        let l2 = len.sample(&mut rng);

        let a1 = Ipv6Prefix::new(addr, l1).unwrap();
        let a2 = Ipv6Prefix::new(addr, l2).unwrap();
        let b1 = Ipv6NetPrefix::new(addr, l1).unwrap();
        let b2 = Ipv6NetPrefix::new(addr, l2).unwrap();

        assert_eq!(a1.covers(&a2), l1 <= l2);
        assert_eq!(a1.covers(&b2), l1 <= l2);
        assert_eq!(b1.covers(&a2), l1 <= l2);
        assert_eq!(b1.covers(&b2), l1 <= l2);

        assert_eq!(a2.covers(&a1), l1 >= l2);
        assert_eq!(a2.covers(&b1), l1 >= l2);
        assert_eq!(b2.covers(&a1), l1 >= l2);
        assert_eq!(b2.covers(&b1), l1 >= l2);
    })
}

#[test]
fn coverage_std_fns() {
    coverage_std_fn_for::<Ipv4Net>();
    coverage_std_fn_for::<Ipv4Prefix>();
    coverage_std_fn_for::<Ipv6Net>();
    coverage_std_fn_for::<Ipv6Prefix>();
    coverage_std_fn_for::<Ipv6NetPrefix>();

    let _err: IpPrefixError = ::ipnet::PrefixLenError.into();
    let _: IpPrefixError = "a".parse::<Ipv4Addr>().unwrap_err().into();
    let err: IpPrefixError = "a".parse::<Ipv4Net>().unwrap_err().into();
    let _ = err.to_string();
}

fn coverage_std_fn_for<P>()
where
    P: Default + Clone + Hash + Eq + Debug + Display,
{
    let p = P::default();
    assert!(p == p.clone());
    assert_eq!(p.to_string(), p.clone().to_string());
    let _ = HashSet::<P>::from_iter(std::iter::once(p));
}