diff --git a/datatypes/epc/domain/tests/test_from_site_notes.py b/datatypes/epc/domain/tests/test_from_site_notes.py
index 289d415a2..ccdb92a8a 100644
--- a/datatypes/epc/domain/tests/test_from_site_notes.py
+++ b/datatypes/epc/domain/tests/test_from_site_notes.py
@@ -105,6 +105,11 @@ class TestFromSiteNotesExample1:
         # general.mains_gas_available: true
         assert result.sap_energy_source.mains_gas is True
 
+    def test_gas_connection_available(self, result: EpcPropertyData) -> None:
+        # general.mains_gas_available: true → gas_connection_available must be True
+        # after the mains_gas → gas_connection_available rename (issue #1378).
+        assert result.sap_energy_source.gas_connection_available is True
+
     def test_electricity_smart_meter(self, result: EpcPropertyData) -> None:
         # general.electricity_smart_meter: true
         assert result.sap_energy_source.electricity_smart_meter_present is True