feat: audio module — sounddevice recorder with WAV export

tests/test_audio.py

@@ -0,0 +1,29 @@
+import numpy as np
+from unittest.mock import patch, MagicMock
+
+
+def test_recorder_starts_and_stops():
+    from audio import AudioRecorder
+    with patch("sounddevice.InputStream") as MockStream:
+        mock_stream = MagicMock()
+        MockStream.return_value.start = MagicMock()
+        MockStream.return_value.stop = MagicMock()
+        MockStream.return_value.close = MagicMock()
+        recorder = AudioRecorder(sample_rate=16000)
+        assert not recorder.is_recording
+        recorder._stream = MockStream.return_value
+        recorder.is_recording = True
+        recorder.stop()
+        assert not recorder.is_recording
+
+
+def test_recorder_save_wav(tmp_path):
+    import wave
+    from audio import AudioRecorder
+    recorder = AudioRecorder(sample_rate=16000)
+    recorder._buffer = [np.zeros(1600, dtype=np.int16)]
+    out = str(tmp_path / "test.wav")
+    recorder.save_wav(out)
+    with wave.open(out) as wf:
+        assert wf.getframerate() == 16000
+        assert wf.getnchannels() == 1