Add #[cfg(test)] coverage for src/codec/opus_impl.rs: encode→decode
round-trip shape + signal-energy survival, decoded duration follows the
packet, and the key regression guard — decode(None)/decode(Some(&[]))
conceals exactly frame_samples per channel (960 mono / 1920 stereo),
pinning the previously-fixed 120ms-burst PLC sizing bug. Tests-only; no
production behavior change.
Implemented by Gemini (junior implementer), reviewed and verified by senior
(cargo build + clippy --all-targets + cargo test all green).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
molluskandClaude Opus 4.8
87fb1595c9