hick-smoltcp 0.2.0

Runtime-agnostic mDNS / DNS-SD engine over smoltcp: the `mdns-proto` Sans-I/O core wired to smoltcp UDP. `no_std` + `alloc`.
Documentation 
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use super::*;

#[test]
fn add_then_since_roundtrips() {
  let t0 = SmoltcpInstant(RawInstant::from_micros(10_000_000_i64));
  let t1 = t0.checked_add_duration(Duration::from_millis(500)).unwrap();
  assert!(t1 > t0);
  assert_eq!(
    t1.checked_duration_since(t0),
    Some(Duration::from_millis(500))
  );
}

#[test]
fn since_is_none_when_earlier_is_later() {
  let t0 = SmoltcpInstant(RawInstant::from_micros(0_i64));
  let t1 = SmoltcpInstant(RawInstant::from_micros(1_000_i64));
  assert_eq!(t0.checked_duration_since(t1), None);
}