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Drag electricity as an electric room heater's natural fuel 🟥

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar 2026-06-30 16:45:20 +00:00
parent 0cd30a13e6
commit 5a29238480
1 changed files with 17 additions and 0 deletions
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17
tests/domain/epc/test_main_heating_system_overlay.py
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@ -419,3 +419,20 @@ def test_solid_fuel_room_heater_drags_its_coherent_room_heater_companions() -> N
assert heating.main_heating_category == 10
assert heating.main_heating_control == 2601
assert heating.meter_type == "Single"
def test_electric_room_heaters_drag_their_natural_electricity_fuel() -> None:
# A landlord names the system; an electric room heater's natural fuel is
# unambiguously electricity (RdSAP main_fuel code 29). The overlay drags it so
# a system-only override is self-coherent even on a cert that lodged a
# different fuel — a later `main_fuel` override still wins (last-wins
# composition), and a contradicting fuel is logged, not silently kept
# (ADR-0041 natural-fuel coherence).
# Act
simulation = main_heating_overlay_for("Electric room heaters", 0)
# Assert
assert simulation is not None
assert simulation.heating is not None
assert simulation.heating.main_fuel_type == 29