Introduce listenUDP and backendURL functional-option seams on
webRTCProxyServer and a dialBackendUDP seam on rtcConnection, mirroring
the pattern already used by rtmpProxyServer. The seams default to the
real net.ListenUDP / http URL builder / net.Dialer so production
behavior is unchanged, but unit tests can now inject fakes.
Cover webRTCProxyServer with focused tests: constructor defaults
(including the three default-backendURL branches), Close with no
listener, Run's listen error / endpoint normalization / graceful
shutdown, HandleApiForWHIP and HandleApiForWHEP CORS preflight, Pick
error, full happy-path against an httptest backend asserting SDP port
rewrite and StoreWebRTC wiring, proxyApiToBackend error paths
(backendURL error, non-2xx, malformed answer), and handleClientUDP's
non-STUN, RTP-like, short-STUN, cached-username, LB-load, LB-error,
and cached-address paths. internal/proxy package coverage rises from
~23% to 43.4%.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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