The test suite defines the full resolver contract using live DNS
queries against controlled records in the sneak.cloud zone
(Cloudflare). Covers FindAuthoritativeNameservers, QueryNameserver,
QueryAllNameservers, LookupNS, and ResolveIPAddresses, including
sorting/determinism guarantees, trailing-dot handling, per-NS
response status model, lame-delegation detection, NXDOMAIN
semantics, CNAME following, and context cancellation.
Also adds DNSSEC validation to planned future features in README.
sneak
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