diff --git a/js-jest/test/gilded_rose.test.js b/js-jest/test/gilded_rose.test.js
index c8e0e3d7..fb92a3f7 100644
--- a/js-jest/test/gilded_rose.test.js
+++ b/js-jest/test/gilded_rose.test.js
@@ -1,9 +1,111 @@
-const {Shop, Item} = require("../src/gilded_rose");
+const { Shop, Item } = require("../src/gilded_rose");
 
-describe("Gilded Rose", function() {
-  it("should foo", function() {
+describe("Gilded Rose", function () {
+  it("Quality never is negative", function () {
     const gildedRose = new Shop([new Item("foo", 0, 0)]);
     const items = gildedRose.updateQuality();
-    expect(items[0].name).toBe("fixme");
+    expect(items[0].quality).toBe(0);
+  });
+
+  it("Sulfuras could not be sold", function () {
+    const gildedRose = new Shop([
+      new Item("Sulfuras, Hand of Ragnaros", 10, 0),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].sellIn).toBe(10);
+  });
+
+  it("Sulfuras could not decrease quality", function () {
+    const gildedRose = new Shop([
+      new Item("Sulfuras, Hand of Ragnaros", 10, 10),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(10);
+  });
+
+  it("Quality could not be more than fifty", function () {
+    const gildedRose = new Shop([new Item("Aged Brie", 10, 50)]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(50);
+  });
+
+  it("Item with date passed quality decrease by twice", function () {
+    const gildedRose = new Shop([new Item("foo", -1, 40)]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(38);
+  });
+
+  it("Aged brie increase quality when it gets older", function () {
+    const gildedRose = new Shop([new Item("Aged Brie", 1, 40)]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(41);
+  });
+
+  it("Aged brie increase by two quality when date passed", function () {
+    const gildedRose = new Shop([new Item("Aged Brie", -1, 40)]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(42);
+  });
+
+  it("Aged brie increase by two quality when date passed and not more than fifty", function () {
+    const gildedRose = new Shop([new Item("Aged Brie", -1, 50)]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(50);
+  });
+
+  it("Backstage passes increase quality by two when sell-in less than ten", function () {
+    const gildedRose = new Shop([
+      new Item("Backstage passes to a TAFKAL80ETC concert", 10, 40),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(42);
+  });
+
+  it("Backstage passes increase quality by two when sell-in less than six", function () {
+    const gildedRose = new Shop([
+      new Item("Backstage passes to a TAFKAL80ETC concert", 6, 40),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(42);
+  });
+
+  it("Backstage passes increase quality by three when sell-in less than five", function () {
+    const gildedRose = new Shop([
+      new Item("Backstage passes to a TAFKAL80ETC concert", 5, 40),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(43);
+  });
+
+  it("Backstage passes increase quality by two when sell-in less than six and not more than fifty", function () {
+    const gildedRose = new Shop([
+      new Item("Backstage passes to a TAFKAL80ETC concert", 6, 49),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(50);
+  });
+
+  it("Backstage passes increase quality by three when sell-in less than five and not more than fifty", function () {
+    const gildedRose = new Shop([
+      new Item("Backstage passes to a TAFKAL80ETC concert", 5, 48),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(50);
+  });
+
+  it("Backstage passes quality drops to zero after concert", function () {
+    const gildedRose = new Shop([
+      new Item("Backstage passes to a TAFKAL80ETC concert", 0, 40),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(0);
+  });
+
+  it("Backstage passes quality increase quality by one when date is more than 10", function () {
+    const gildedRose = new Shop([
+      new Item("Backstage passes to a TAFKAL80ETC concert", 11, 40),
+    ]);
+    const items = gildedRose.updateQuality();
+    expect(items[0].quality).toBe(41);
   });
 });