Add typescript solution & update test

TypeScript/app/gilded-rose.ts

@@ -3,7 +3,11 @@ export class Item {
   sellIn: number;
   quality: number;
 
-  constructor(name, sellIn, quality) {
+  constructor(
+    name: Item["name"],
+    sellIn: Item["sellIn"],
+    quality: Item["quality"]
+  ) {
     this.name = name;
     this.sellIn = sellIn;
     this.quality = quality;
@@ -19,49 +23,47 @@ export class GildedRose {
 
   updateQuality() {
     for (let i = 0; i < this.items.length; i++) {
-      if (this.items[i].name != 'Aged Brie' && this.items[i].name != 'Backstage passes to a TAFKAL80ETC concert') {
+      const itemName = this.items[i].name;
-        if (this.items[i].quality > 0) {
+      let itemQuality = this.items[i].quality;
-          if (this.items[i].name != 'Sulfuras, Hand of Ragnaros') {
+      let itemSellin = this.items[i].sellIn;
-            this.items[i].quality = this.items[i].quality - 1
+
+      if (itemName.includes("Sulfuras")) {
+        continue;
+      } else {
+        itemSellin -= 1;
       }
+
+      if (itemName.includes("Aged Brie")) {
+        itemQuality++;
+      } else if (itemName.includes("Backstage passes")) {
+        if (itemSellin < 11) {
+          itemQuality = itemQuality + 2;
+        } else if (itemSellin < 6) {
+          itemQuality = itemQuality + 3;
+        } else if (itemSellin < 0) {
+          itemQuality = 0;
+        } else {
+          itemQuality++;
+        }
+      } else if (itemName.includes("Conjured")) {
+        if (itemQuality > 0) {
+          itemQuality = itemQuality - 2;
+        }
+        if (itemSellin < 0) {
+          itemQuality = itemQuality - itemQuality * 2;
         }
       } else {
-        if (this.items[i].quality < 50) {
+        if (itemQuality > 0) {
-          this.items[i].quality = this.items[i].quality + 1
+          itemQuality = itemQuality - 1;
-          if (this.items[i].name == 'Backstage passes to a TAFKAL80ETC concert') {
+        }
-            if (this.items[i].sellIn < 11) {
+
-              if (this.items[i].quality < 50) {
+        if (itemSellin < 0) {
-                this.items[i].quality = this.items[i].quality + 1
+          itemQuality = 0;
-              }
-            }
-            if (this.items[i].sellIn < 6) {
-              if (this.items[i].quality < 50) {
-                this.items[i].quality = this.items[i].quality + 1
-              }
-            }
-          }
-        }
-      }
-      if (this.items[i].name != 'Sulfuras, Hand of Ragnaros') {
-        this.items[i].sellIn = this.items[i].sellIn - 1;
-      }
-      if (this.items[i].sellIn < 0) {
-        if (this.items[i].name != 'Aged Brie') {
-          if (this.items[i].name != 'Backstage passes to a TAFKAL80ETC concert') {
-            if (this.items[i].quality > 0) {
-              if (this.items[i].name != 'Sulfuras, Hand of Ragnaros') {
-                this.items[i].quality = this.items[i].quality - 1
-              }
-            }
-          } else {
-            this.items[i].quality = this.items[i].quality - this.items[i].quality
-          }
-        } else {
-          if (this.items[i].quality < 50) {
-            this.items[i].quality = this.items[i].quality + 1
-          }
         }
       }
+
+      this.items[i].quality = itemQuality > 50 ? 50 : itemQuality;
+      this.items[i].sellIn = itemSellin;
     }
 
     return this.items;

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

@@ -1,9 +1,46 @@
-import { Item, GildedRose } from '@/gilded-rose';
+import { Item, GildedRose } from "@/gilded-rose";
 
-describe('Gilded Rose', () => {
+describe("Gilded Rose", () => {
-  it('should foo', () => {
+  let gildedRose: GildedRose;
-    const gildedRose = new GildedRose([new Item('foo', 0, 0)]);
+
+  beforeEach(() => {
+    gildedRose = new GildedRose([
+      new Item("foo", 0, 0),
+      new Item("Conjured item", 10, 8),
+      new Item("Sulfuras item", 0, 80),
+      new Item("Aged Brie item ", 10, 33),
+      new Item("Aged Brie item", 0, 50),
+      new Item("Backstage passes item", 8, 30),
+    ]);
+  });
+
+  it("Should foo", () => {
     const items = gildedRose.updateQuality();
-    expect(items[0].name).toBe('fixme');
+    expect(items[0].name).toBe("foo");
+  });
+
+  it("The Quality of Backstage passes item increases by 2 when there are 10 days or less", () => {
+    const items = gildedRose.updateQuality();
+    expect(items[5].quality).toBe(32);
+  });
+
+  it("The quality of Conjured item should be degraded by twice more than normal items", () => {
+    const items = gildedRose.updateQuality();
+    expect(items[1].quality).toBe(6);
+  });
+
+  it("Aged Brie item actually increases in Quality the older it gets", () => {
+    const items = gildedRose.updateQuality();
+    expect(items[3].quality).toBe(34);
+  });
+
+  it("The quality of Sulfuras item should remain unchanged", () => {
+    const items = gildedRose.updateQuality();
+    expect(items[2].quality).toBe(80);
+  });
+
+  it("The Quality of an item is never more than 50", () => {
+    const items = gildedRose.updateQuality();
+    expect(items[4].quality).toBe(50);
   });
 });