Fix mixed case service schema registration (#96448)

tests/helpers/test_service.py

@@ -762,6 +762,27 @@ async def test_async_get_all_descriptions_dynamically_created_services(
     }
 
 
+async def test_register_with_mixed_case(hass: HomeAssistant) -> None:
+    """Test registering a service with mixed case.
+
+    For backwards compatibility, we have historically allowed mixed case,
+    and automatically converted it to lowercase.
+    """
+    logger = hass.components.logger
+    logger_config = {logger.DOMAIN: {}}
+    await async_setup_component(hass, logger.DOMAIN, logger_config)
+    logger_domain_mixed = "LoGgEr"
+    hass.services.async_register(
+        logger_domain_mixed, "NeW_SeRVICE", lambda x: None, None
+    )
+    service.async_set_service_schema(
+        hass, logger_domain_mixed, "NeW_SeRVICE", {"description": "new service"}
+    )
+    descriptions = await service.async_get_all_descriptions(hass)
+    assert "description" in descriptions[logger.DOMAIN]["new_service"]
+    assert descriptions[logger.DOMAIN]["new_service"]["description"] == "new service"
+
+
 async def test_call_with_required_features(hass: HomeAssistant, mock_entities) -> None:
     """Test service calls invoked only if entity has required features."""
     test_service_mock = AsyncMock(return_value=None)