diff --git a/tests/infrastructure/solar/test_google_solar_api_wiring.py b/tests/infrastructure/solar/test_google_solar_api_wiring.py
new file mode 100644
index 00000000..52618f9d
--- /dev/null
+++ b/tests/infrastructure/solar/test_google_solar_api_wiring.py
@@ -0,0 +1,26 @@
+from typing import Any
+from unittest.mock import MagicMock, patch
+
+from backend.apis.GoogleSolarApi import GoogleSolarApi
+from infrastructure.solar.google_solar_api_client import (
+    BuildingInsightsNotFoundError,
+    GoogleSolarApiClient,
+)
+
+
+# ---------------------------------------------------------------------------
+# Slice 1: get_building_insights delegates to _solar_client
+# ---------------------------------------------------------------------------
+
+
+def test_get_building_insights_delegates_to_solar_client() -> None:
+    # Arrange
+    payload: dict[str, Any] = {"solarPotential": {"maxArrayPanelsCount": 20}}
+    with patch.object(GoogleSolarApiClient, "get_building_insights", return_value=payload):
+        api = GoogleSolarApi(api_key="test-key", solar_materials=[])
+
+        # Act
+        result = api.get_building_insights(longitude=-0.1278, latitude=51.5074)
+
+    # Assert
+    assert result == payload