spec premium_membership
"""
Premium Membership Benefits

Defines the benefits for premium members.
This spec can be referenced by other specs.
"""

rule discount_rate:
  10%

rule free_shipping_threshold:
  50

rule points_multiplier:
  1.5

rule monthly_bonus_points:
  100


spec membership_benefits
"""
Membership Benefits

Shows how specs can reference other specs.
Membership levels have different benefits.
"""

uses membership: premium_membership

data monthly_spend: number
  -> minimum 0
  -> suggest 150

rule discount:
  monthly_spend * membership.discount_rate

rule shipping_cost:
  10
  unless monthly_spend >= membership.free_shipping_threshold
    then 0

rule base_points:
  monthly_spend * membership.points_multiplier

rule bonus_points:
  membership.monthly_bonus_points

rule total_points:
  base_points + bonus_points

rule total_savings:
  discount + shipping_cost