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test(modelling): pin ASHP radiator-count clamp to table bounds

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Slice 6 of ADR-0025 costing. Characterises the distribution clamp built in the
tracer: a radiator proxy below 4 prices as the 4-rad band, above 12 as the
12-rad band, in-range exact.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar 2026-06-06 20:44:57 +00:00
parent fd9e020b09
commit c7acf43b52
1 changed files with 27 additions and 0 deletions
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27
tests/domain/modelling/test_products.py
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@ -141,3 +141,30 @@ def test_heat_pump_rounds_design_heat_loss_up_to_the_next_band() -> None:
assert abs(_pump_price(products, 15.0) - 10680.0) <= 1e-9
assert abs(_pump_price(products, 15.01) - 11400.0) <= 1e-9 # above largest
assert abs(_pump_price(products, 25.0) - 11400.0) <= 1e-9
def _full_distribution(products: Products, radiator_count: int) -> float:
"""Isolate the full distribution line: no-system (decommission 0) + pump
(4 kW) 9720 + cylinder 2382.60 = 12102.60 base."""
inputs = AshpCostInputs(
existing_system=AshpExistingSystem.NONE,
is_small_property=True,
design_heat_loss_kw=4.0,
radiator_count=radiator_count,
has_reusable_wet_system=False,
)
return products.ashp_bundle_cost(inputs).total - 12102.60
def test_radiator_count_is_clamped_to_the_distribution_table_bounds() -> None:
# Arrange — the distribution table only spans 4-12 radiators, so a proxy
# count outside that range is clamped to the nearest band (ADR-0025).
products = Products()
# Act / Assert — below 4 prices as 4 (2220); above 12 prices as 12 (6288);
# in-range is exact.
assert abs(_full_distribution(products, 2) - 2220.0) <= 1e-9
assert abs(_full_distribution(products, 4) - 2220.0) <= 1e-9
assert abs(_full_distribution(products, 9) - 4680.0) <= 1e-9
assert abs(_full_distribution(products, 12) - 6288.0) <= 1e-9
assert abs(_full_distribution(products, 15) - 6288.0) <= 1e-9