feat(tests): add unit tests for WebAudioSource and WebAudioSink functionality

tests/backend/test_web_audio_bridge.py

@@ -0,0 +1,39 @@
+import asyncio
+
+import numpy as np
+
+from meshchatx.src.backend.web_audio_bridge import WebAudioSink, WebAudioSource
+
+
+class _DummySink:
+    def __init__(self):
+        self.frames = []
+
+    def can_receive(self, from_source=None):
+        return True
+
+    def handle_frame(self, frame, source):
+        self.frames.append(frame)
+
+
+def test_web_audio_source_pushes_frames():
+    sink = _DummySink()
+    src = WebAudioSource(target_frame_ms=60, sink=sink)
+    zeros = np.zeros(160, dtype=np.int16)
+    src.push_pcm(zeros.tobytes())
+    assert len(sink.frames) == 1
+
+
+def test_web_audio_sink_encodes_and_sends_bytes():
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+    sent = []
+
+    async def _send_bytes(data):
+        sent.append(data)
+
+    sink = WebAudioSink(loop, _send_bytes)
+    sink.handle_frame(np.zeros((160, 1), dtype=np.float32), None)
+    loop.run_until_complete(asyncio.sleep(0.01))
+    loop.close()
+    assert sent, "expected audio bytes to be queued for sending"