Added new functionality to support conjured items

- add new ConjuredItemsBehavior
- add conjured items behavior detection to resolver
- update snapshots because they didn’t account for conjured items

TypeScript/app/gilded-rose.spec.ts

@@ -35,6 +35,4 @@ describe("Gilded Rose", () => {
     expect(updateMock).toHaveBeenCalledWith(item1);
     expect(updateMock).toHaveBeenCalledWith(item2);
   });
-
-  // to implement: "Conjured" items degrade in Quality twice as fast as normal items
 });

TypeScript/app/update-behaviors/behavior-resolver.spec.ts

@@ -4,6 +4,7 @@ import { AgedBrieBehavior } from "./implementations/aged-brie/aged-brie-behavior
 import { DefaultBehavior } from "./implementations/default/default-behavior";
 import { BackstagePassBehavior } from "./implementations/backstage-pass/backstage-pass-behavior";
 import { LegendaryItemBehavior } from "./implementations/legendary-item/legendary-item-behavior";
+import { ConjuredItemBehavior } from "./implementations/conjured-item/conjured-item-behavior";
 
 describe("Behavior resolver", () => {
   it("should correctly resolve Aged Brie", () => {
@@ -25,6 +26,11 @@ describe("Behavior resolver", () => {
       getUpdateBehaviorFor(new Item("Sulfuras, Hand of Ragnaros", 0, 0))
     ).toBeInstanceOf(LegendaryItemBehavior);
   });
+  it("should correctly resolve Conjured Items", () => {
+    expect(
+      getUpdateBehaviorFor(new Item("Conjured Mana Cake", 0, 0))
+    ).toBeInstanceOf(ConjuredItemBehavior);
+  });
 
   it("should correctly resolve the rest to Legacy behavior", () => {
     expect(

TypeScript/app/update-behaviors/behavior-resolver.ts

@@ -4,6 +4,7 @@ import { DefaultBehavior } from "./implementations/default/default-behavior";
 import { AgedBrieBehavior } from "./implementations/aged-brie/aged-brie-behavior";
 import { BackstagePassBehavior } from "./implementations/backstage-pass/backstage-pass-behavior";
 import { LegendaryItemBehavior } from "./implementations/legendary-item/legendary-item-behavior";
+import { ConjuredItemBehavior } from "./implementations/conjured-item/conjured-item-behavior";
 
 export function getUpdateBehaviorFor(item: Item): IUpdateBehavior {
   switch (item.name) {
@@ -13,6 +14,8 @@ export function getUpdateBehaviorFor(item: Item): IUpdateBehavior {
       return new BackstagePassBehavior(item);
     case "Sulfuras, Hand of Ragnaros":
       return new LegendaryItemBehavior(item);
+    case "Conjured Mana Cake":
+      return new ConjuredItemBehavior(item);
     default:
       return new DefaultBehavior(item);
   }

TypeScript/app/update-behaviors/implementations/conjured-item/conjured-item-behavior.spec.ts

@@ -0,0 +1,59 @@
+import { Item } from "@app/item";
+import { ConjuredItemBehavior } from "./conjured-item-behavior";
+
+describe("Conjured Item Behavior", () => {
+  it("should degrade quality with 2 and sellIn with 1 when sellIn is over 0", () => {
+    const behavior = new ConjuredItemBehavior(
+      new Item("Conjured Mana Cake", 1, 4)
+    );
+
+    const result = behavior.update();
+
+    expect(result).toMatchObject({
+      name: "Conjured Mana Cake",
+      sellIn: 0,
+      quality: 2,
+    });
+  });
+  it("should degrade quality with 4 and sellin with 1 when sellIn is equal to zero", () => {
+    const behavior = new ConjuredItemBehavior(
+      new Item("Conjured Mana Cake", 0, 5)
+    );
+
+    const result = behavior.update();
+
+    expect(result).toMatchObject({
+      name: "Conjured Mana Cake",
+      sellIn: -1,
+      quality: 1,
+    });
+  });
+
+  it("should degrade quality with 4 and sellin with 1 when sellIn is under zero", () => {
+    const behavior = new ConjuredItemBehavior(
+      new Item("Conjured Mana Cake", -1, 5)
+    );
+
+    const result = behavior.update();
+
+    expect(result).toMatchObject({
+      name: "Conjured Mana Cake",
+      sellIn: -2,
+      quality: 1,
+    });
+  });
+
+  it("shouldn't degrade quality under 0", () => {
+    const behavior = new ConjuredItemBehavior(
+      new Item("Conjured Mana Cake", 1, 1)
+    );
+
+    const result = behavior.update();
+
+    expect(result).toMatchObject({
+      name: "Conjured Mana Cake",
+      sellIn: 0,
+      quality: 0,
+    });
+  });
+});

TypeScript/app/update-behaviors/implementations/conjured-item/conjured-item-behavior.ts

@@ -0,0 +1,16 @@
+import { Item } from "@app/item";
+import { IUpdateBehavior } from "@app/update-behaviors/update-behavior.interface";
+
+export class ConjuredItemBehavior implements IUpdateBehavior {
+  constructor(private item: Item) {}
+
+  update(): Item {
+    const amountToSubtract = this.item.sellIn <= 0 ? 4 : 2;
+
+    this.item.quality = Math.max(this.item.quality - amountToSubtract, 0);
+
+    this.item.sellIn -= 1;
+
+    return this.item;
+  }
+}

TypeScript/snapshot-tests/__snapshots__/approvals.spec.ts.snap

@@ -44,7 +44,7 @@ exports[`Gilded Rose Approval should match the snapshot for thirty Days 1`] = `
   },
   Item {
     "name": "Conjured Mana Cake",
-    "quality": 5,
+    "quality": 4,
     "sellIn": 2,
   },
 ]
@@ -94,7 +94,7 @@ exports[`Gilded Rose Approval should match the snapshot for thirty Days 2`] = `
   },
   Item {
     "name": "Conjured Mana Cake",
-    "quality": 4,
+    "quality": 2,
     "sellIn": 1,
   },
 ]
@@ -144,7 +144,7 @@ exports[`Gilded Rose Approval should match the snapshot for thirty Days 3`] = `
   },
   Item {
     "name": "Conjured Mana Cake",
-    "quality": 3,
+    "quality": 0,
     "sellIn": 0,
   },
 ]
@@ -194,7 +194,7 @@ exports[`Gilded Rose Approval should match the snapshot for thirty Days 4`] = `
   },
   Item {
     "name": "Conjured Mana Cake",
-    "quality": 1,
+    "quality": 0,
     "sellIn": -1,
   },
 ]