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14b45a1b3e
Slice 1 of Bill Derivation — the reference-data foundation that later slices price the calculator's per-end-use kWh against: - Fuel enum (canonical billing fuels; the join key between the calculator's SAP-code fuels and the rates snapshot). COAL + HEAT_NETWORK are members with no national rate. - FuelRates value object: unit_rate_p_per_kwh / standing_charge_p_per_day / seg_export_p_per_kwh; raises UnpricedFuel on a fuel it has no rate for rather than billing at a wrong default. - FuelRatesRepository port (ADR-0011 Repo-reads-stored-reference-data) + StaticFileFuelRatesRepository reading a committed JSON snapshot. - Snapshot fuel_rates_2026_q2.json: GB national, Apr-Jun 2026 Ofgem cap (gas/electricity) + DESNZ/NEP May 2026 (off-gas). Carries the full researched data; the value object exposes single-rate fuels this slice. Off-peak (day/night), house coal and heat network raise UnpricedFuel until later slices. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
33 lines
1,003 B
Python
33 lines
1,003 B
Python
from __future__ import annotations
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import pytest
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from domain.fuel_rates.fuel import Fuel, UnpricedFuel
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from domain.fuel_rates.fuel_rates import FuelRate, FuelRates
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def _rates() -> FuelRates:
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return FuelRates(
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period="test",
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seg_export_p_per_kwh=15.0,
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rates={Fuel.MAINS_GAS: FuelRate(unit_rate_p_per_kwh=5.74, standing_charge_p_per_day=29.09)},
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)
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def test_unit_rate_and_standing_charge_read_back_for_a_priced_fuel() -> None:
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# Arrange
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rates = _rates()
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# Act / Assert
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assert rates.unit_rate_p_per_kwh(Fuel.MAINS_GAS) == 5.74
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assert rates.standing_charge_p_per_day(Fuel.MAINS_GAS) == 29.09
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def test_a_fuel_absent_from_the_snapshot_raises_unpriced_fuel() -> None:
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# Arrange — LPG is not in this snapshot.
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rates = _rates()
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# Act / Assert — the raise carries the offending fuel for the operator.
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with pytest.raises(UnpricedFuel) as excinfo:
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rates.unit_rate_p_per_kwh(Fuel.LPG)
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assert excinfo.value.fuel is Fuel.LPG
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