Add country-specific companion table filtering for map page

backend/tests/test_routers/test_dashboard.py

@@ -522,6 +522,19 @@ class TestDashboardBansOriginField:
 
         assert mock_fn.call_args[1]["source"] == "archive"
 
+    async def test_bans_by_country_country_code_forwarded(
+        self, dashboard_client: AsyncClient
+    ) -> None:
+        """The ``country_code`` query parameter is forwarded to bans_by_country."""
+        mock_fn = AsyncMock(return_value=_make_bans_by_country_response())
+        with patch("app.routers.dashboard.ban_service.bans_by_country", new=mock_fn):
+            await dashboard_client.get(
+                "/api/dashboard/bans/by-country?country_code=DE"
+            )
+
+        _, kwargs = mock_fn.call_args
+        assert kwargs.get("country_code") == "DE"
+
     async def test_blocklist_origin_serialised_correctly(
         self, dashboard_client: AsyncClient
     ) -> None: