add tests for shop requirements

js/spec/gilded_rose_spec.js

@@ -1,9 +1,98 @@
-describe("Gilded Rose", function() {
-
-  it("should foo", function() {
-    const gildedRose = new Shop([ new Item("foo", 0, 0) ]);
+describe('Gilded Rose', function() {
+  it('should foo', function() {
+    const gildedRose = new Shop([new Item('foo', 0, 0)]);
     const items = gildedRose.updateQuality();
-    expect(items[0].name).toEqual("fixme");
+    expect(items[0].name).toEqual('foo');
   });
 
+  it('can updateQuality for Backstage Passes', () => {
+    const gildedRose = new Shop([
+      new Item('Backstage passes to a TAFKAL80ETC concert', 15, 20),
+      new Item('Backstage passes to a TAFKAL80ETC concert', 10, 46),
+      new Item('Backstage passes to a TAFKAL80ETC concert', 5, 49)
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].name).toEqual('Backstage passes to a TAFKAL80ETC concert');
+    expect(items[0].sellIn).toEqual(14);
+    expect(items[0].quality).toEqual(21);
+
+    expect(items[1].name).toEqual('Backstage passes to a TAFKAL80ETC concert');
+    expect(items[1].sellIn).toEqual(9);
+    expect(items[1].quality).toEqual(48);
+
+    expect(items[2].name).toEqual('Backstage passes to a TAFKAL80ETC concert');
+    expect(items[2].sellIn).toEqual(4);
+    expect(items[2].quality).toEqual(50);
+  });
+
+  it('can updateQuality for Aged Brie', () => {
+    const gildedRose = new Shop([new Item('Aged Brie', 2, 0)]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].name).toEqual('Aged Brie');
+    expect(items[0].sellIn).toEqual(1);
+    expect(items[0].quality).toEqual(1);
+  });
+
+  it('can updateQuality for Sulfuras', () => {
+    const gildedRose = new Shop([
+      new Item('Sulfuras, Hand of Ragnaros', 0, 80),
+      new Item('Sulfuras, Hand of Ragnaros', -1, 80)
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].name).toEqual('Sulfuras, Hand of Ragnaros');
+    expect(items[0].sellIn).toEqual(-1);
+    expect(items[0].quality).toEqual(80);
+
+    expect(items[1].name).toEqual('Sulfuras, Hand of Ragnaros');
+    expect(items[1].sellIn).toEqual(-2);
+    expect(items[1].quality).toEqual(80);
+  });
+
+  it('can updateQuality for basic items', () => {
+    const gildedRose = new Shop([
+      new Item('+5 Dexterity Vest', 10, 20),
+      new Item('Elixir of the Mongoose', 5, 7)
+    ]);
+
+    const items = gildedRose.updateQuality();
+    expect(items[0].name).toEqual('+5 Dexterity Vest');
+    expect(items[0].sellIn).toEqual(9);
+    expect(items[0].quality).toEqual(19);
+
+    expect(items[1].name).toEqual('Elixir of the Mongoose');
+    expect(items[1].sellIn).toEqual(4);
+    expect(items[1].quality).toEqual(6);
+  });
+
+  it('can updateQuality for conjured items', () => {
+    const gildedRose = new Shop([new Item('Conjured Mana Cake', 3, 6)]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].sellIn).toEqual(2);
+    expect(items[0].quality).toEqual(4);
+  });
+
+  it('Once the sell by date has passed, Quality degrades twice as fast', () => {
+    const gildedRose = new Shop([new Item('+5 Dexterity Vest', -2, 20)]);
+
+    const items = gildedRose.updateQuality();
+    expect(items[0].sellIn).toEqual(-3);
+    expect(items[0].quality).toEqual(18);
+  });
+
+  it('The Quality of an item is never negative', () => {
+    const gildedRose = new Shop([new Item('+5 Dexterity Vest', -2, 1)]);
+
+    const items = gildedRose.updateQuality();
+    expect(items[0].name).toEqual('+5 Dexterity Vest');
+    expect(items[0].sellIn).toEqual(-3);
+    expect(items[0].quality).toEqual(0);
+  });
+
+  it('will not increase quality over 50', () => {
+    const gildedRose = new Shop([new Item('Aged Brie', -1, 50)]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].name).toEqual('Aged Brie');
+    expect(items[0].sellIn).toEqual(-2);
+    expect(items[0].quality).toEqual(50);
+  });
 });