Improve type hints in flux_led tests (#120734)

tests/components/flux_led/conftest.py

@@ -3,18 +3,11 @@
 from unittest.mock import patch
 
 import pytest
-
-from tests.common import mock_device_registry
-
-
-@pytest.fixture(name="device_reg")
-def device_reg_fixture(hass):
-    """Return an empty, loaded, registry."""
-    return mock_device_registry(hass)
+from typing_extensions import Generator
 
 
 @pytest.fixture
-def mock_single_broadcast_address():
+def mock_single_broadcast_address() -> Generator[None]:
     """Mock network's async_async_get_ipv4_broadcast_addresses."""
     with patch(
         "homeassistant.components.network.async_get_ipv4_broadcast_addresses",
@@ -24,7 +17,7 @@ def mock_single_broadcast_address():
 
 
 @pytest.fixture
-def mock_multiple_broadcast_addresses():
+def mock_multiple_broadcast_addresses() -> Generator[None]:
     """Mock network's async_async_get_ipv4_broadcast_addresses to return multiple addresses."""
     with patch(
         "homeassistant.components.network.async_get_ipv4_broadcast_addresses",