Don't mock the internals of the microgrid client

Since we are now using an external microgrid client, it is better to
mock the location more shallowly, avoiding any timezone lookups
completely.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

tests/microgrid/test_microgrid_api.py

@@ -4,6 +4,7 @@
 """Tests of MicrogridApi."""
 
 import asyncio
+import zoneinfo
 from asyncio.tasks import ALL_COMPLETED
 from unittest import mock
 from unittest.mock import AsyncMock, MagicMock
@@ -94,13 +95,13 @@ def metadata(self) -> Metadata:
         Returns:
             the microgrid metadata.
         """
-        mock_timezone_finder = MagicMock()
-        mock_timezone_finder.timezone_at.return_value = "Europe/Berlin"
-        meta._timezone_finder = mock_timezone_finder  # pylint: disable=protected-access
-
         return Metadata(
             microgrid_id=8,
-            location=meta.Location(latitude=52.520008, longitude=13.404954),
+            location=Location(
+                latitude=52.520008,
+                longitude=13.404954,
+                timezone=zoneinfo.ZoneInfo("Europe/Berlin"),
+            ),
         )
 
     @mock.patch("grpc.aio.insecure_channel")