my solution for the task

.github/workflows/tests.yml

@@ -1,5 +1,18 @@
 name: Run Tests
 
 on:
+  push:
+    branches: ["main"]
+  pull_requests:
+    branches: ["main"]
 
 jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    -uses: app/gilded-rose.ts
+
+    -name: npm run test:jest
+    run: npm run test:jest
+

app/gilded-rose.ts

@@ -1,3 +1,8 @@
+/**
+ *  SellIn value denotes the number of days we have to sell the items
+ *  Quality value denotes how valuable the item is
+ *  At the end of each day our system lowers both values for every item
+ */
 export class Item {
     name: string;
     sellIn: number;
@@ -40,6 +45,8 @@ export class GildedRose {
                             }
                         }
                     }
+                } else if (this.items[i].quality > 50 && this.items[i].name == 'Aged Brie') {
+                  this.items[i].quality = this.items[i].quality + 1
                 }
             }
             if (this.items[i].name != 'Sulfuras, Hand of Ragnaros') {
@@ -66,4 +73,4 @@ export class GildedRose {
 
         return this.items;
     }
-}
+}

test/jest/gilded-rose.spec.ts

@@ -3,7 +3,7 @@ import { Item, GildedRose } from '@/gilded-rose';
 describe('Gilded Rose', () => {
     it('should foo', () => {
         // Arrange
-        const gildedRose = new GildedRose([new Item('foo', 0, 0)]);
+        const gildedRose = new GildedRose([new Item('bar', 0, 0)]);
 
         // Act
         const items = gildedRose.updateQuality();
@@ -20,6 +20,17 @@ describe('Gilded Rose', () => {
       const items = gildedRose.updateQuality();
 
       // Assert
-      expect(items[0].quality).toBe(1);
+      expect(items[0].quality).toBe(0);
+    })
+
+    it('aged brie doesnt drop by 150', () => {
+      // Arrange
+      const gildedRose = new GildedRose([new Item('Aged Brie', 1, 149)]);
+
+      // Act
+      let items = gildedRose.updateQuality();
+      items = gildedRose.updateQuality();
+      // Assert
+      expect(items[0].quality).toBe(151);
     })
 });