def test_optimal_cycle_time_calculates_correctly():
import math
demand = get_demand()
raw_costs = get_raw_costs()
t_star = EOQ.optimal_cycle_time(raw_costs=raw_costs, demand=demand)
assert t_star == math.sqrt((2 * raw_costs.ordering_cost) /
(demand.quantity * raw_costs.holding_cost))
def part3():
d = Demand(240, 'M')
rc = RawCosts(50.0, 100.0, 0.01, holding_time_unit='M')
Q = EOQ.optimal_order_quantity(rc, d)
print(Q)
T = EOQ.optimal_cycle_time(rc, d)
print(T)
print(T * 4)
def test_optimal_cycle_time_with_demand_zero_raises():
with pytest.raises(ValueError):
EOQ.optimal_cycle_time(raw_costs=get_raw_costs(),
demand=get_demand(quantity=0))
def test_optimal_cycle_time_with_missing_demand_raises():
with pytest.raises(ValueError):
EOQ.optimal_cycle_time(raw_costs=get_raw_costs(), demand=None)
def test_optimal_cycle_time_with_holding_cost_zero_raises():
with pytest.raises(ValueError):
EOQ.optimal_cycle_time(raw_costs=get_raw_costs(holding_rate=0.0),
demand=get_demand())
def test_optimal_cycle_time_with_missing_raw_scores_raises():
with pytest.raises(ValueError):
EOQ.optimal_cycle_time(raw_costs=None, demand=get_demand())