Added tests that cover the entire functionality of the GildedRose updateQuality function

test/jest/gilded-rose.spec.ts

@@ -9,7 +9,7 @@ describe('Gilded Rose', () => {
         const items = gildedRose.updateQuality();
 
         // Assert
-        expect(items[0].name).toBe('bar');
+        expect(items[0].name).toBe('foo');
     });
 
     it('sword quality drops by 1', () => {
@@ -19,7 +19,89 @@ describe('Gilded Rose', () => {
       // Act
       const items = gildedRose.updateQuality();
 
+      // Assert
+      expect(items[0].quality).toBe(0);
+    });
+
+    it('aged brie and backstage pass grows in quality by 1 except if its >=50', () => {
+      // Arrange
+      const gildedRose = new GildedRose([
+        new Item('Aged Brie', 2, 0), 
+        new Item('Aged Brie', 1, 50),
+        new Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+        new Item("Backstage passes to a TAFKAL80ETC concert", 15, 50),
+      ]);
+
+      // Act
+      const items = gildedRose.updateQuality();
+
       // Assert
       expect(items[0].quality).toBe(1);
+      expect(items[1].quality).toBe(50);
+      expect(items[2].quality).toBe(21);
+      expect(items[3].quality).toBe(50);
+    });
+
+    it('sulfura doesnt lose quality', () => {
+      // Arrange
+      const gildedRose = new GildedRose([new Item('Sulfuras, Hand of Ragnaros', 0, 80)]);
+
+      // Act
+      const items = gildedRose.updateQuality();
+
+      // Assert
+      expect(items[0].quality).toBe(80);
     })
+
+    it('sellin days gets lowered, except if its sulfura', () => {
+      // Arrange
+      const gildedRose = new GildedRose([new Item('Sulfuras, Hand of Ragnaros', 0, 80), new Item('Aged Brie', 2, 0)]);
+
+      // Act
+      const items = gildedRose.updateQuality();
+
+      // Assert
+      expect(items[0].sellIn).toBe(0);
+      expect(items[1].sellIn).toBe(1);
+    });
+
+    it("backstage pass quality changes as sellIn days gets smaller", () => {
+      // Arrange
+      const gildedRose = new GildedRose([
+        new Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+        new Item("Backstage passes to a TAFKAL80ETC concert", 10, 49),
+        new Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+        new Item("Backstage passes to a TAFKAL80ETC concert", 5, 10),
+      ]);
+
+      // Act
+      const items = gildedRose.updateQuality();
+
+      // Assert
+      expect(items[0].quality).toBe(21);
+      expect(items[1].quality).toBe(50);
+      expect(items[2].quality).toBe(50);
+      expect(items[3].quality).toBe(13);
+    })
+
+    it('quality decreases more if sellin days negative', () => {
+      // Arrange
+      const gildedRose = new GildedRose([
+        new Item("Elixir of the Mongoose", -2, 7),
+        new Item("Elixir of the Mongoose", -2, 0),
+        new Item("Backstage passes to a TAFKAL80ETC concert", -3, 10),
+        new Item('Aged Brie', -1, 50),
+        new Item('Aged Brie', -2, 2),
+      ]);
+
+      // Act
+      const items = gildedRose.updateQuality();
+
+      //Assert
+      expect(items[0].quality).toBe(5);
+      expect(items[1].quality).toBe(0);
+      expect(items[2].quality).toBe(0);
+      expect(items[3].quality).toBe(50);
+      expect(items[4].quality).toBe(4);
+    });
 });