room_cal/tests/test_calc.py

import pytest
from room_cal._utils import services as _services_list
from room_cal.pricing.calc import (
  net_to_list,
  list_to_net,
  list_to_retail,
  retail_to_list,
  net_to_retail,
  retail_to_net,
)

_SERVICES = _services_list()
_NET = 100.0


@pytest.mark.parametrize('service', _SERVICES)
def test_net_to_list_round_trip(service):
  result = list_to_net(service, net_to_list(service, _NET))
  assert result == pytest.approx(_NET, abs=0.02)


@pytest.mark.parametrize('service', _SERVICES)
def test_list_to_retail_round_trip(service):
  list_price = net_to_list(service, _NET)
  result = retail_to_list(service, list_to_retail(service, list_price))
  assert result == pytest.approx(list_price, abs=0.02)


@pytest.mark.parametrize('service', _SERVICES)
def test_net_to_retail_round_trip(service):
  result = retail_to_net(service, net_to_retail(service, _NET))
  assert result == pytest.approx(_NET, abs=0.02)


@pytest.mark.parametrize('service', _SERVICES)
def test_list_exceeds_net(service):
  assert net_to_list(service, _NET) > _NET


@pytest.mark.parametrize('service', _SERVICES)
def test_retail_exceeds_list(service):
  list_price = net_to_list(service, _NET)
  assert list_to_retail(service, list_price) > list_price


@pytest.mark.parametrize('service', _SERVICES)
def test_retail_exceeds_net(service):
  assert net_to_retail(service, _NET) > _NET


def test_services_produce_different_list_prices():
  prices = {s: net_to_list(s, _NET) for s in _SERVICES}
  assert len(set(prices.values())) > 1, "All services returned identical list prices"


def test_invalid_service_raises():
  with pytest.raises(ValueError):
    net_to_list('nonexistent_service', _NET)


@pytest.mark.parametrize('service', _SERVICES)
def test_monotone_higher_net_gives_higher_list(service):
  assert net_to_list(service, 200.0) > net_to_list(service, 100.0)


@pytest.mark.parametrize('service', _SERVICES)
def test_monotone_higher_list_gives_higher_retail(service):
  assert list_to_retail(service, 200.0) > list_to_retail(service, 100.0)