Add MockToggleEntity type hints in tests (#120075)

tests/components/light/test_init.py

@@ -1,5 +1,6 @@
 """The tests for the Light component."""
 
+from typing import Literal
 from unittest.mock import MagicMock, mock_open, patch
 
 import pytest
@@ -1144,7 +1145,7 @@ invalid_no_brightness_no_color_no_transition,,,
 
 @pytest.mark.parametrize("light_state", [STATE_ON, STATE_OFF])
 async def test_light_backwards_compatibility_supported_color_modes(
-    hass: HomeAssistant, light_state
+    hass: HomeAssistant, light_state: Literal["on", "off"]
 ) -> None:
     """Test supported_color_modes if not implemented by the entity."""
     entities = [