Public Run(ctx, cfg) <-chan Result streams diagnostic events for the seven
tests (tcp, greet, auth?, connect, udp, stun, api) wired through the
SOCKS5 primitives, STUN codec, retry classification and RU hints.
- Per-test attempt loop with running/passed/failed events, transient-only
retries (per-attempt timeout treated as transient, parent ctx cancel as
permanent), context-aware backoff sleep.
- Connection lifecycle: tcpConn shared across greet/auth/connect (closed
and redialed on retry); separate udpConn2 control channel for UDP
ASSOCIATE kept alive for the duration of the stun test.
- STUN-via-SOCKS5: builds 10-byte SOCKS5 UDP header + STUN binding
request, decodes reply with ATYP-aware header strip (1/3/4).
- runAPI plugs SOCKS5 dial into http.Transport.DialContext; passes on
HTTP 200 OR 401.
- Skip semantics: dependency-failed tests emit single skipped result;
cancellation latches and propagates as cancelled-failed (current) +
cancelled-skipped (remaining).
- Defaults applied to a copy of cfg; UseAuth=false suppresses any "auth"
result entirely.
Tests: 10 TestRun_* covering happy/auth-rejected/all-rejected/
connect-refused/udp-unsupported/timeout-then-ok/cancelled-mid-flight/
defaults plus extractRawHex unit. Fake SOCKS5 proxy + UDP relay echoing
synthetic STUN binding success responses; httptest stub for API splice.
Combined coverage 84.3% (>=80% target). go test -race clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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