feat(microphone): PollMonitor mit Geräteerkennung (TDD)

tests/test_microphone_monitor.py

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+# tests/test_microphone_monitor.py
+import asyncio
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+from whisper_local.microphone._poll import PollMonitor
+
+
+def _fake_devices(names: list[str]) -> list[dict]:
+    return [{"name": n, "max_input_channels": 1} for n in names]
+
+
+@pytest.mark.asyncio
+async def test_on_device_added_fires_when_device_appears():
+    monitor = PollMonitor(configured_device=None, interval=0.05)
+    event = asyncio.Event()
+    added: list[str] = []
+
+    async def on_added(name: str) -> None:
+        added.append(name)
+        event.set()
+
+    monitor.on_device_added = on_added
+    call_count = 0
+
+    def fake_query():
+        nonlocal call_count
+        call_count += 1
+        if call_count == 1:
+            return _fake_devices(["Mic A"])
+        return _fake_devices(["Mic A", "Mic B"])
+
+    with patch("sounddevice.query_devices", side_effect=fake_query):
+        await monitor.start()
+        await asyncio.wait_for(event.wait(), timeout=1.0)
+        monitor.stop()
+
+    assert added == ["Mic B"]
+
+
+@pytest.mark.asyncio
+async def test_on_device_removed_fires_when_device_disappears():
+    monitor = PollMonitor(configured_device=None, interval=0.05)
+    event = asyncio.Event()
+    removed: list[str] = []
+
+    async def on_removed(name: str) -> None:
+        removed.append(name)
+        event.set()
+
+    monitor.on_device_removed = on_removed
+    call_count = 0
+
+    def fake_query():
+        nonlocal call_count
+        call_count += 1
+        if call_count == 1:
+            return _fake_devices(["Mic A", "Mic B"])
+        return _fake_devices(["Mic A"])
+
+    with patch("sounddevice.query_devices", side_effect=fake_query):
+        await monitor.start()
+        await asyncio.wait_for(event.wait(), timeout=1.0)
+        monitor.stop()
+
+    assert removed == ["Mic B"]