Argent Rose Requirements Specification

Context.

My name is Syl. I'm the owner of the Argent Rose, a small wizardry store.

I need to update the inventory of my store, at the end of each day, in order to track the quality and sell-in of my products.

• All products have:

  1. A description.
  2. A sell-in value which denotes the number of days we have to sell the product (0 means the last day the product should be sold).
  3. A quality value which denotes how valuable the product is. It's never negative and never more than 50.

• All the products in our inventory are valid.

Rules for updating products before its sell-in days expires.

Regular products:

• quality decreases by two.
• sell-in decreases by one.

Special products

1. Products described as "Aged Brie":

   • Their sell-in decreases by one.
   • Their quality increases by one.

2. Products described as "Lanzarote Wine":

   • Their sell-in decreases by one.
   • Their quality increases by two.

3. Products described as "Theatre Passes":

   • Their sell-in decreases by one.
   • Their quality changes as their sell-in day approaches:
     • increases by one when there are more than five days to sell the product.
     • increases by three when there are five days or less to sell the product.
     • drops to zero after the play.

Rules for updating products after its sell-in days expires.

• Their quality changes twice as fast as it did before the sell-in days expires.
• Their sell-in decreases by one.