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test(modelling): pin ASHP heat-pump band round-up at the edges

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Slice 5 of ADR-0025 costing. Characterises the pump-band selection built in
the tracer: a design heat loss is rounded UP to the smallest covering band
{5,8,11,15,16+} kW, and loads above the largest band take the top rate. Edge
pins (5.0/5.01/8.0/8.01/11.0/15.0/15.01/25.0) lock the boundaries.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar 2026-06-06 20:44:19 +00:00
parent 9860f06864
commit fd9e020b09
1 changed files with 30 additions and 0 deletions
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tests/domain/modelling/test_products.py
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@ -111,3 +111,33 @@ def test_decommission_falls_back_for_systems_not_on_the_rate_sheet() -> None:
assert abs(products.ashp_bundle_cost(_small_no_reuse(AshpExistingSystem.NONE)).total - (base + 0.0)) <= 1e-9
assert abs(products.ashp_bundle_cost(_small_no_reuse(AshpExistingSystem.ELECTRIC_OTHER)).total - (base + 570.0)) <= 1e-9
assert abs(products.ashp_bundle_cost(_small_no_reuse(AshpExistingSystem.OTHER)).total - (base + 720.0)) <= 1e-9
def _pump_price(products: Products, design_heat_loss_kw: float) -> float:
"""Isolate the heat-pump line: no-system (decommission 0) + cylinder
2382.60 + distribution (7 rads) 3618 = 6000.60 base, so total - base is the
pump band price for ``design_heat_loss_kw``."""
inputs = AshpCostInputs(
existing_system=AshpExistingSystem.NONE,
is_small_property=True,
design_heat_loss_kw=design_heat_loss_kw,
radiator_count=7,
has_reusable_wet_system=False,
)
return products.ashp_bundle_cost(inputs).total - 6000.60
def test_heat_pump_rounds_design_heat_loss_up_to_the_next_band() -> None:
# Arrange
products = Products()
# Act / Assert — bands {5,8,11,15,16+} kW -> {9720,9840,10200,10680,11400};
# a load is rounded UP to the smallest band that covers it.
assert abs(_pump_price(products, 5.0) - 9720.0) <= 1e-9 # at the 5 kW edge
assert abs(_pump_price(products, 5.01) - 9840.0) <= 1e-9 # just over -> 8 kW
assert abs(_pump_price(products, 8.0) - 9840.0) <= 1e-9
assert abs(_pump_price(products, 8.01) - 10200.0) <= 1e-9
assert abs(_pump_price(products, 11.0) - 10200.0) <= 1e-9
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