Detect use of deprecated base_url (#35353)

* Detect use of deprecated base_url

* Update get_url helper

* Update core migration

* Migrate all tests

tests/components/locative/test_init.py

@@ -5,11 +5,12 @@ from homeassistant import data_entry_flow
 from homeassistant.components import locative
 from homeassistant.components.device_tracker import DOMAIN as DEVICE_TRACKER_DOMAIN
 from homeassistant.components.locative import DOMAIN, TRACKER_UPDATE
+from homeassistant.config import async_process_ha_core_config
 from homeassistant.const import HTTP_OK, HTTP_UNPROCESSABLE_ENTITY
 from homeassistant.helpers.dispatcher import DATA_DISPATCHER
 from homeassistant.setup import async_setup_component
 
-from tests.async_mock import Mock, patch
+from tests.async_mock import patch
 
 # pylint: disable=redefined-outer-name
 
@@ -33,7 +34,9 @@ async def locative_client(loop, hass, hass_client):
 @pytest.fixture
 async def webhook_id(hass, locative_client):
     """Initialize the Geofency component and get the webhook_id."""
-    hass.config.api = Mock(base_url="http://example.com")
+    await async_process_ha_core_config(
+        hass, {"internal_url": "http://example.local:8123"},
+    )
     result = await hass.config_entries.flow.async_init(
         "locative", context={"source": "user"}
     )