Refactor geo caching and service layer tests

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/tests/test_routers/test_geo.py

@@ -19,7 +19,7 @@ from app.models.geo import GeoDetail, GeoInfo
 # ---------------------------------------------------------------------------
 
 _SETUP_PAYLOAD = {
-    "master_password": "testpassword1",
+    "master_password": "TestPassword1!",
     "database_path": "bangui.db",
     "fail2ban_socket": "/var/run/fail2ban/fail2ban.sock",
     "timezone": "UTC",
@@ -46,6 +46,10 @@ async def geo_client(tmp_path: Path) -> AsyncClient:  # type: ignore[misc]
     app.state.db = db
     app.state.http_session = MagicMock()
 
+    # Initialize GeoCache (normally done in lifespan handler)
+    from app.services.geo_cache import GeoCache
+    app.state.geo_cache = GeoCache()
+
     transport = ASGITransport(app=app)
     async with AsyncClient(transport=transport, base_url="http://test") as ac:
         setup_payload = _SETUP_PAYLOAD.copy()
@@ -198,9 +202,12 @@ class TestReResolve:
         await db.commit()
 
         geo_result = {"5.5.5.5": GeoInfo(country_code="FR", country_name="France", asn=None, org=None)}
-        with patch(
-            "app.routers.geo.geo_service.lookup_batch",
-            AsyncMock(return_value=geo_result),
+        # Patch the default geo_cache instance used by geo_service
+        from app.services.geo_service import _default_geo_cache
+        with patch.object(
+            _default_geo_cache,
+            "lookup_batch",
+            new_callable=lambda: AsyncMock(return_value=geo_result),
         ):
             resp = await geo_client.post("/api/geo/re-resolve")