Add test for existing functionality

TypeScript/test/gilded-rose.spec.ts

@@ -2,11 +2,107 @@ import { expect } from 'chai';
 import { Item, GildedRose } from '../app/gilded-rose';
 
 describe('Gilded Rose', function () {
-
+    it('should reduce quality and sell date by 1', function() {
-    it('should foo', function() {
+        const gildedRose = new GildedRose([ new Item('random_item', 1, 1) ]);
-        const gildedRose = new GildedRose([ new Item('foo', 0, 0) ]);
         const items = gildedRose.updateQuality();
-        expect(items[0].name).to.equal('fixme');
+        expect(items[0].name).to.equal('random_item');
+        expect(items[0].sellIn).to.equal(0);
+        expect(items[0].quality).to.equal(0);
     });
 
+    it('should reduce quality by 2 after sell date', function() {
+        const gildedRose = new GildedRose([ new Item('random_item', 0, 7) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('random_item');
+        expect(items[0].sellIn).to.equal(-1);
+        expect(items[0].quality).to.equal(5);
+    });
+
+    it('should reduce quality by 1 when it reaches sell date', function() {
+        const gildedRose = new GildedRose([ new Item('random_item', 1, 7) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('random_item');
+        expect(items[0].sellIn).to.equal(0);
+        expect(items[0].quality).to.equal(6);
+    });
+
+    it('should not reduce quality when its already zero', function() {
+        const gildedRose = new GildedRose([ new Item('random_item', 2, 0) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('random_item');
+        expect(items[0].sellIn).to.equal(1);
+        expect(items[0].quality).to.equal(0);
+    });
+
+    it('should increase in quality when the item is "Aged Brie"', function() {
+        const gildedRose = new GildedRose([ new Item('Aged Brie', 2, 10) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Aged Brie');
+        expect(items[0].sellIn).to.equal(1);
+        expect(items[0].quality).to.equal(11);
+    });
+
+    it('should not have quality more than 50', function() {
+        const gildedRose = new GildedRose([ new Item('Aged Brie', 2, 50) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Aged Brie');
+        expect(items[0].sellIn).to.equal(1);
+        expect(items[0].quality).to.equal(50);
+    });
+
+    it('should be able to have quality of 50', function() {
+        const gildedRose = new GildedRose([ new Item('Aged Brie', 2, 49) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Aged Brie');
+        expect(items[0].sellIn).to.equal(1);
+        expect(items[0].quality).to.equal(50);
+    });
+
+    it('should never change the quality of Sulfuras', function() {
+        const gildedRose = new GildedRose([ new Item('Sulfuras, Hand of Ragnaros', 2, 49) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Sulfuras, Hand of Ragnaros');
+        expect(items[0].sellIn).to.equal(2);
+        expect(items[0].quality).to.equal(49);
+    });
+
+    it('should increase in quality of Backstage passes by one when days more than 10', function() {
+        const gildedRose = new GildedRose([ new Item('Backstage passes to a TAFKAL80ETC concert', 11, 40) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Backstage passes to a TAFKAL80ETC concert');
+        expect(items[0].sellIn).to.equal(10);
+        expect(items[0].quality).to.equal(41);
+    });
+
+    it('should increase in quality of Backstage passes by two when days less than 11 and more than 5', function() {
+        const gildedRose = new GildedRose([ new Item('Backstage passes to a TAFKAL80ETC concert', 10, 40) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Backstage passes to a TAFKAL80ETC concert');
+        expect(items[0].sellIn).to.equal(9);
+        expect(items[0].quality).to.equal(42);
+    });
+
+    it('should increase in quality of Backstage passes by two when days are 6', function() {
+        const gildedRose = new GildedRose([ new Item('Backstage passes to a TAFKAL80ETC concert', 6, 40) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Backstage passes to a TAFKAL80ETC concert');
+        expect(items[0].sellIn).to.equal(5);
+        expect(items[0].quality).to.equal(42);
+    });
+
+    it('should increase in quality of Backstage passes by two when days are less than 5', function() {
+        const gildedRose = new GildedRose([ new Item('Backstage passes to a TAFKAL80ETC concert', 5, 40) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Backstage passes to a TAFKAL80ETC concert');
+        expect(items[0].sellIn).to.equal(4);
+        expect(items[0].quality).to.equal(43);
+    });
+
+    it('should set quality to zero when the concert has passed', function() {
+        const gildedRose = new GildedRose([ new Item('Backstage passes to a TAFKAL80ETC concert', 0, 40) ]);
+        const items = gildedRose.updateQuality();
+        expect(items[0].name).to.equal('Backstage passes to a TAFKAL80ETC concert');
+        expect(items[0].sellIn).to.equal(-1);
+        expect(items[0].quality).to.equal(0);
+    });
 });