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Slice 3 of Bill Derivation. sap_code_to_fuel(code) maps a SAP 10.2 / Table 32 fuel code to the canonical billing Fuel — bounded to the ~47 Table 32 codes (the carrier, orthogonal to the PCDB product index, so all PCDB heat pumps share one electricity code). Mains gas / LPG / oil+bioliquids / coal / smokeless / wood / electricity (standard + off-peak) / heat-network groupings; an unmapped code (dual fuel, grid-export) raises UnmappedSapCode rather than guessing. Also: ADR-0014 deferred/TODO section records the stubbed appliances+cooking (pending the SapResult fields), the off-peak day/night split, the heat-network rate gap, and regional rates / ETL. The SapResult -> EnergyBreakdown adapter (next slice) is gated on the appliances/cooking fields landing on SapResult. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
42 lines
1.4 KiB
Python
42 lines
1.4 KiB
Python
from __future__ import annotations
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import pytest
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from domain.fuel_rates.fuel import Fuel
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from domain.property_baseline.sap_fuel import sap_code_to_fuel
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from domain.sap10_calculator.exceptions import UnmappedSapCode
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def test_mains_gas_code_maps_to_mains_gas() -> None:
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# Arrange / Act / Assert — Table 32 code 1 is mains gas.
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assert sap_code_to_fuel(1) == Fuel.MAINS_GAS
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@pytest.mark.parametrize(
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("code", "fuel"),
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[
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(1, Fuel.MAINS_GAS),
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(2, Fuel.LPG),
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(4, Fuel.OIL),
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(76, Fuel.OIL), # bioethanol — a liquid fuel row
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(11, Fuel.COAL), # house coal
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(15, Fuel.COAL), # anthracite
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(12, Fuel.SMOKELESS),
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(20, Fuel.WOOD_LOGS),
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(23, Fuel.WOOD_PELLETS),
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(30, Fuel.ELECTRICITY), # standard tariff
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(32, Fuel.ELECTRICITY_OFF_PEAK), # 7-hour tariff
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(41, Fuel.HEAT_NETWORK), # heat from electric heat pump (community)
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(50, Fuel.HEAT_NETWORK), # electricity for distribution pumping
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],
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)
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def test_table_32_codes_map_to_their_billing_fuel(code: int, fuel: Fuel) -> None:
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# Arrange / Act / Assert
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assert sap_code_to_fuel(code) == fuel
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def test_an_unmapped_code_raises_rather_than_guessing() -> None:
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# Arrange — code 10 (dual fuel) has no single billing fuel.
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# Act / Assert
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with pytest.raises(UnmappedSapCode):
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sap_code_to_fuel(10)
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