Tests cover the actual code paths changed in voice fixes:
_on_packet DAVE passthrough (8 tests):
- Known SSRC + DAVE decrypt success → buffered
- Unknown SSRC + DAVE → skip DAVE, passthrough to Opus
- DAVE "Unencrypted" error → passthrough, not dropped
- DAVE other error → packet dropped
- No DAVE session → direct decode
- Bot's own SSRC → ignored (echo prevention)
- Multiple SSRCs → separate buffers
SSRC auto-mapping (6 tests):
- Single allowed user → auto-mapped
- Multiple allowed users → no auto-map
- No allowlist → sole non-bot member inferred
- Unallowed user → rejected
- Only bot in channel → no map
- Auto-map persists across checks
Buffer lifecycle (4 tests):
- Known SSRC completed utterance
- Short buffer ignored
- Recent audio waits
- Stale unknown buffer discarded
TTS playback (10 tests):
- play_tts calls play_in_voice_channel in VC
- play_tts falls through when not in VC
- play_tts wrong channel no match
- Voice input dedup (runner skips)
- Text + voice_mode combinations
- Error/empty response skipped
- Agent TTS tool dedup
UDP keepalive (2 tests):
- Interval within bounds
- Silence frame actually sent via send_packet
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