GoogleSolarApiClient retries on transient HTTP errors 🟥

tests/infrastructure/solar/test_google_solar_api_client.py

@@ -31,3 +31,30 @@ def test_get_building_insights_returns_parsed_json() -> None:
     # Assert
     assert result == payload
     mock_get.assert_called_once()
+
+
+# ---------------------------------------------------------------------------
+# Slice 2: Transient HTTP errors trigger retries
+# ---------------------------------------------------------------------------
+
+
+def test_get_building_insights_retries_on_transient_error() -> None:
+    # Arrange
+    client = GoogleSolarApiClient(api_key="test-key")
+    payload: dict[str, Any] = {"solarPotential": {"maxArrayPanelsCount": 20}}
+
+    transient_error = requests.exceptions.ConnectionError("timeout")
+    transient_error.response = None  # type: ignore[attr-defined]
+
+    success_response = MagicMock()
+    success_response.json.return_value = payload
+    success_response.raise_for_status.return_value = None
+
+    with patch("requests.get", side_effect=[transient_error, success_response]) as mock_get:
+        with patch("time.sleep"):
+            # Act
+            result = client.get_building_insights(longitude=-0.1278, latitude=51.5074)
+
+    # Assert
+    assert result == payload
+    assert mock_get.call_count == 2