Add enum for item types

TypeScript/app/gilded-rose.ts

@@ -10,6 +10,13 @@ export class Item {
   }
 }
 
+export enum ItemType {
+  Sulfuras = 'Sulfuras, Hand of Ragnaros',
+  BackstagePass = 'Backstage passes to a TAFKAL80ETC concert',
+  AgedBrie = 'Aged Brie',
+  ConjuredItem = 'Conjured',
+}
+
 export class GildedRose {
   items: Array<Item>;
 
@@ -38,6 +45,12 @@ export class GildedRose {
       ++item.quality;
   }
 
+  private static updateConjuredItem(item: Item) {
+    item.quality -= 2;
+    if (item.sellIn < 0)
+      item.quality -= 2;
+  }
+
   private static updateRegularItem(item: Item) {
     --item.quality;
     if (item.sellIn < 0)
@@ -54,15 +67,18 @@ export class GildedRose {
   private updateItemQuality(item: Item) {
     --item.sellIn;
     switch (item.name) {
-      case 'Sulfuras, Hand of Ragnaros':
+      case ItemType.Sulfuras:
         GildedRose.updateSulfuras(item);
         break;
-      case 'Backstage passes to a TAFKAL80ETC concert':
+      case ItemType.BackstagePass:
         GildedRose.updateBackstagePass(item);
         break;
-      case 'Aged Brie':
+      case ItemType.AgedBrie:
         GildedRose.updateAgedBrie(item);
         break;
+      case ItemType.ConjuredItem:
+        GildedRose.updateConjuredItem(item);
+        break;
       default:
         GildedRose.updateRegularItem(item);
     }

TypeScript/test/mocha/gilded-rose.spec.ts

@@ -101,7 +101,45 @@ describe('Gilded Rose', () => {
     });
   });
 
-  describe('Any normal item', () => {
+  describe('Conjured item', () => {
+    it('one iteration, not passed sell date', () => {
+      const gildedRose = new GildedRose([new Item('Conjured', 5, 31)]);
+      gildedRose.updateQuality();
+      expect(gildedRose.items[0].quality).to.equal(29);
+    });
+
+    it('one iteration, passed sell date', () => {
+      const gildedRose = new GildedRose([new Item('Conjured', -1, 31)]);
+      gildedRose.updateQuality();
+      expect(gildedRose.items[0].quality).to.equal(27);
+    });
+
+    it('multiple iterations, not reaching negative quality and not passed sell date', () => {
+      const gildedRose = new GildedRose([new Item('Conjured', 21, 31)]);
+      for (let i = 0; i < 10; ++i) {
+        gildedRose.updateQuality();
+      }
+      expect(gildedRose.items[0].quality).to.equal(11);
+    });
+
+    it('multiple iterations, not reaching negative quality and passed sell date', () => {
+      const gildedRose = new GildedRose([new Item('Conjured', 5, 37)]);
+      for (let i = 0; i < 10; ++i) {
+        gildedRose.updateQuality();
+      }
+      expect(gildedRose.items[0].quality).to.equal(7);
+    });
+
+    it('multiple iterations, reaching negative quality and passed sell date', () => {
+      const gildedRose = new GildedRose([new Item('Conjured', 5, 12)]);
+      for (let i = 0; i < 10; ++i) {
+        gildedRose.updateQuality();
+      }
+      expect(gildedRose.items[0].quality).to.equal(0);
+    });
+  });
+
+  describe('Regular item', () => {
     it('one iteration, not passed sell date', () => {
       const gildedRose = new GildedRose([new Item('Any normal item', 5, 31)]);
       gildedRose.updateQuality();
@@ -130,7 +168,7 @@ describe('Gilded Rose', () => {
       expect(gildedRose.items[0].quality).to.equal(15);
     });
 
-    it('multiple iterations, reaching max quality and passed sell date', () => {
+    it('multiple iterations, reaching negative quality and passed sell date', () => {
       const gildedRose = new GildedRose([new Item('Any normal item', 5, 12)]);
       for (let i = 0; i < 10; ++i) {
         gildedRose.updateQuality();
@@ -138,10 +176,4 @@ describe('Gilded Rose', () => {
       expect(gildedRose.items[0].quality).to.equal(0);
     });
   });
-
-  // it('should foo', () => {
-  //   const gildedRose = new GildedRose([new Item('foo', 0, 0)]);
-  //   const items = gildedRose.updateQuality();
-  //   expect(items[0].name).to.equal('fixme');
-  // });
 });