Add tests for enumerate_input/output_devices

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: WyattBlue

tests/test_device.py

@@ -0,0 +1,68 @@
+import sys
+
+import pytest
+
+import av.error
+from av.device import DeviceInfo, enumerate_input_devices, enumerate_output_devices
+
+
+def test_device_info_attributes() -> None:
+    d = DeviceInfo("0", "FaceTime HD Camera", True, ["video"])
+    assert d.name == "0"
+    assert d.description == "FaceTime HD Camera"
+    assert d.is_default is True
+    assert d.media_types == ["video"]
+
+
+def test_device_info_repr_default() -> None:
+    d = DeviceInfo("0", "FaceTime HD Camera", True, ["video"])
+    assert repr(d) == "<av.DeviceInfo '0' 'FaceTime HD Camera' (default)>"
+
+
+def test_device_info_repr_non_default() -> None:
+    d = DeviceInfo("1", "Built-in Microphone", False, ["audio"])
+    assert repr(d) == "<av.DeviceInfo '1' 'Built-in Microphone'>"
+
+
+def test_enumerate_input_devices_unknown_format() -> None:
+    with pytest.raises(ValueError, match="no such input format"):
+        enumerate_input_devices("not_a_real_format_xyz")
+
+
+def test_enumerate_output_devices_unknown_format() -> None:
+    with pytest.raises(ValueError, match="no such output format"):
+        enumerate_output_devices("not_a_real_format_xyz")
+
+
+def _assert_valid_device_list(devices: list[DeviceInfo]) -> None:
+    assert isinstance(devices, list)
+    for device in devices:
+        assert isinstance(device, DeviceInfo)
+        assert isinstance(device.name, str)
+        assert isinstance(device.description, str)
+        assert isinstance(device.is_default, bool)
+        assert isinstance(device.media_types, list)
+        assert all(isinstance(mt, str) for mt in device.media_types)
+
+
+@pytest.mark.skipif(sys.platform != "darwin", reason="avfoundation is macOS only")
+def test_enumerate_input_devices_avfoundation() -> None:
+    _assert_valid_device_list(enumerate_input_devices("avfoundation"))
+
+
+@pytest.mark.skipif(sys.platform != "linux", reason="v4l2 is Linux only")
+def test_enumerate_input_devices_v4l2() -> None:
+    _assert_valid_device_list(enumerate_input_devices("video4linux2"))
+
+
+@pytest.mark.skipif(sys.platform != "linux", reason="alsa is Linux only")
+def test_enumerate_input_devices_alsa() -> None:
+    _assert_valid_device_list(enumerate_input_devices("alsa"))
+
+
+@pytest.mark.skipif(sys.platform != "win32", reason="dshow is Windows only")
+def test_enumerate_input_devices_dshow() -> None:
+    try:
+        _assert_valid_device_list(enumerate_input_devices("dshow"))
+    except av.error.OSError:
+        pytest.skip("dshow device enumeration not available")