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tdd-gilded-rose's Introduction

TDD「镶金玫瑰商店」

业务背景

"镶金玫瑰"！这是一家魔兽世界里的小商店。出售的商品也都是高质量的。但不妙的是，随着商品逐渐接近保质期，它们的质量也不断下滑。我们用一个IT系统来更新库存信息。

首先，简单介绍一下我们的系统：

  • 所有商品都有一个SellIn值，这是商品的保质期，最好在这么多天之内卖掉
  • 所有商品都有一个Quality值，代表商品的价值
  • 商品的SellIn值和Quality值，会随着天数的增加而变化，但是会有特例

商品的价格规则说明如下：

  • 商品的价值永远不会小于0，也永远不会超过50
  • 一旦过了保质期，Quality就以双倍的速度下滑
  • 陈年干酪（Aged Brie）是一种特殊的商品，放得越久，价值反而越高
  • 萨弗拉斯（Sulfuras）是一种传奇商品，没有保质期的概念，质量也不会下滑
  • 后台门票（Backstage pass）和陈年干酪（Aged Brie）有相似之处：
    • 越接近演出日，随着SellIn值的增加，商品价值Quality值反而上升
    • 在演出前10天，价值每天上升2点
    • 演出前5天，价值每天上升3点
    • 一旦过了演出日，价值就马上变成0

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