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Resolve biomass, dual-fuel and biodiesel water-heating overrides off house coal 🟥

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Khalim Conn-Kowlessar 2026-07-01 13:02:38 +00:00
parent ea3696e8d5
commit da15418fd8
1 changed files with 27 additions and 0 deletions
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27
tests/domain/epc/test_water_heating_overlay.py
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@ -86,6 +86,33 @@ def test_from_main_wood_logs_decodes_to_the_wood_fuel_not_house_coal() -> None:
assert simulation.heating.water_heating_fuel == 6
@pytest.mark.parametrize(
("water_heating_value", "fuel"),
[
# Biomass (community) — RdSAP fuel 31. Under a coherent community main
# the calculator scores DHW from the main, so this is a faithful,
# score-neutral relabel off house coal; the fuel is still emitted so an
# individual-main dwelling would score biomass, not coal (ADR-0043).
("From main system, biomass (community)", 31),
# Dual fuel (mineral + wood) — RdSAP fuel 9.
("From main system, dual fuel (mineral and wood)", 9),
# Biodiesel (community) — RdSAP fuel 34.
("From main system, biodiesel (community)", 34),
],
)
def test_biomass_family_water_heating_decodes_off_house_coal(
water_heating_value: str, fuel: int
) -> None:
# Act
simulation = water_heating_overlay_for(water_heating_value, 0)
# Assert — from main system (901), each to its own RdSAP fuel, not coal 33.
assert simulation is not None
assert simulation.heating is not None
assert simulation.heating.water_heating_code == 901
assert simulation.heating.water_heating_fuel == fuel
@pytest.mark.parametrize("water_heating_value", ["Unknown", ""])
def test_unresolvable_water_heating_produces_no_overlay(
water_heating_value: str,