From 38e9ebd5c772e1255002ae08c8df21e066e75578 Mon Sep 17 00:00:00 2001
From: Daniel Roth <daniel_roth@hotmail.co.uk>
Date: Thu, 16 Jul 2026 16:04:05 +0000
Subject: [PATCH] =?UTF-8?q?Rate=20MVHR=20dwellings=20via=20Table=204g=20an?=
 =?UTF-8?q?d=20biomass=20heat=20networks=20via=20Table=2012=20code=2043=20?=
 =?UTF-8?q?=F0=9F=9F=A5?=
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 .../epc/domain/tests/test_from_site_notes.py  | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/datatypes/epc/domain/tests/test_from_site_notes.py b/datatypes/epc/domain/tests/test_from_site_notes.py
index d65bf2ee4..16ad4f4d8 100644
--- a/datatypes/epc/domain/tests/test_from_site_notes.py
+++ b/datatypes/epc/domain/tests/test_from_site_notes.py
@@ -157,6 +157,30 @@ class TestCommunityHeatingMapping:
         assert main.sap_main_heating_code == 301
         assert main.main_fuel_type == 51
 
+    def test_community_biomass_boilers_lodge_table_12_biomass_fuel(self) -> None:
+        # Arrange — PasHub renders the community fuel with the Table 12 row
+        # wording (`Heat from boilers - biomass`), unlike the Elmhurst §14.1
+        # labels (`Biomass`).
+        data = load("pashub_rdsap_site_notes_example1.json")
+        mh = data["heating_and_hot_water"]["main_heating"]
+        mh["system_type"] = "Community heating system"
+        mh["community_heat_source"] = "Community heating - boilers only"
+        mh["fuel"] = "Heat from boilers - biomass"
+        mh["controls"] = (
+            "Charging system linked to use of community heating, room thermostat only"
+        )
+        mh["product_id"] = 0
+        survey = from_dict(PasHubRdSapSiteNotes, data)
+
+        # Act
+        main = EpcPropertyDataMapper.from_site_notes(
+            survey
+        ).sap_heating.main_heating_details[0]
+
+        # Assert — Table 12 code 43 (heat from boilers — biomass).
+        assert main.sap_main_heating_code == 301
+        assert main.main_fuel_type == 43
+
     def test_unknown_heat_source_strict_raises(self) -> None:
         # Arrange
         data = load("pashub_rdsap_site_notes_example1.json")
@@ -170,6 +194,22 @@ class TestCommunityHeatingMapping:
         with pytest.raises(UnmappedPasHubLabel, match="community heat source"):
             EpcPropertyDataMapper.from_site_notes(survey)
 
+    def test_unknown_community_fuel_strict_raises(self) -> None:
+        # Arrange — a recognised heat source with an uncovered fuel label. It
+        # must strict-raise at the boundary rather than pass the raw string
+        # through to the calculator's deep `MissingMainFuelType` (ADR-0015).
+        data = load("pashub_rdsap_site_notes_example1.json")
+        mh = data["heating_and_hot_water"]["main_heating"]
+        mh["system_type"] = "Community heating system"
+        mh["community_heat_source"] = "Community heating - boilers only"
+        mh["fuel"] = "Some novel fuel"
+        mh["controls"] = ""
+        survey = from_dict(PasHubRdSapSiteNotes, data)
+
+        # Act / Assert
+        with pytest.raises(UnmappedPasHubLabel, match="community fuel"):
+            EpcPropertyDataMapper.from_site_notes(survey)
+
 
 class TestRoomInRoofMapping:
     """A surveyed room-in-roof block (RdSAP §3.10 detailed measurement) must
@@ -833,6 +873,7 @@ class TestMechanicalVentilationKindCoding:
             ("Mechanical Extract - Centralised", "EXTRACT_OR_PIV_OUTSIDE"),
             ("Positive Input - From Outside", "EXTRACT_OR_PIV_OUTSIDE"),
             ("Positive Input - From Loft (As Natural)", None),
+            ("MV - Heat Recovery", "MVHR"),
         ],
     )
     def test_label_maps_to_mechanical_kind(