**Refactored Code for Run-Unit-Test-Local

ShoppingCart.js

@@ -1,14 +1,17 @@
+
 // Triggering unit test run locally
 class ShoppingCart {
   constructor() {
     this.items = [];
     this.discount = 0;
   }
 
+  // Add an item to the shopping cart
   addItem(item) {
     this.items.push(item);
   }
 
+  // Remove an item from the shopping cart by index
   removeItem(index) {
     if (index >= 0 && index < this.items.length) {
       this.items.splice(index, 1);
@@ -17,6 +20,7 @@ class ShoppingCart {
     }
   }
 
+  // Calculate the total price of all items in the cart, after applying the discount
   getTotalPrice() {
     let totalPrice = 0;
     for (const item of this.items) {
@@ -25,31 +29,37 @@ class ShoppingCart {
     return totalPrice - this.discount;
   }
 
+  // Apply a discount amount to the total price
   applyDiscount(amount) {
     this.discount = amount;
   }
 
+  // Display all items in the shopping cart with their index, name, and price
   displayItems() {
     console.log('Shopping Cart Items:');
     this.items.forEach((item, index) => {
       console.log(`${index + 1}. ${item.name} - $${item.price}`);
     });
   }
 
+  // Clear the shopping cart by removing all items and resetting the discount
   clearCart() {
     this.items = [];
     this.discount = 0;
     console.log('Cart cleared.');
   }
 
+  // Get the total number of items in the shopping cart
   getItemCount() {
     return this.items.length;
   }
 
+  // Get an item from the shopping cart by its name
   getItemByName(name) {
     return this.items.find(item => item.name === name);
   }
 
+  // Check if an item with the given name exists in the shopping cart
   containsItem(name) {
     return this.items.some(item => item.name === name);
   }

TestCases/ShoppingCart_unittest.js

@@ -0,0 +1,96 @@
+
+// ShoppingCart.test.js
+
+const ShoppingCart = require('./ShoppingCart');
+const Item = require('./Item');
+
+describe('ShoppingCart', () => {
+  let cart;
+
+  beforeEach(() => {
+    cart = new ShoppingCart();
+  });
+
+  describe('addItem', () => {
+    it('should add an item to the cart', () => {
+      const item = new Item('Laptop', 1000);
+      cart.addItem(item);
+      expect(cart.getItemCount()).toBe(1);
+      expect(cart.containsItem('Laptop')).toBeTruthy();
+    });
+  });
+
+  describe('removeItem', () => {
+    it('should remove an item from the cart', () => {
+      const item1 = new Item('Laptop', 1000);
+      const item2 = new Item('Phone', 800);
+      cart.addItem(item1);
+      cart.addItem(item2);
+      cart.removeItem(1);
+      expect(cart.getItemCount()).toBe(1);
+      expect(cart.containsItem('Phone')).toBeFalsy();
+    });
+
+    it('should handle invalid index', () => {
+      const item = new Item('Laptop', 1000);
+      cart.addItem(item);
+      console.error = jest.fn();
+      cart.removeItem(1);
+      expect(console.error).toHaveBeenCalledWith('Invalid index');
+    });
+  });
+
+  describe('getTotalPrice', () => {
+    it('should calculate the total price', () => {
+      const item1 = new Item('Laptop', 1000);
+      const item2 = new Item('Phone', 800);
+      const item3 = new Item('Headphones', 100);
+      cart.addItem(item1);
+      cart.addItem(item2);
+      cart.addItem(item3);
+      expect(cart.getTotalPrice()).toBe(1900);
+    });
+
+    it('should apply the discount', () => {
+      const item1 = new Item('Laptop', 1000);
+      const item2 = new Item('Phone', 800);
+      cart.addItem(item1);
+      cart.addItem(item2);
+      cart.applyDiscount(200);
+      expect(cart.getTotalPrice()).toBe(1600);
+    });
+  });
+
+  describe('clearCart', () => {
+    it('should clear the cart', () => {
+      const item1 = new Item('Laptop', 1000);
+      const item2 = new Item('Phone', 800);
+      cart.addItem(item1);
+      cart.addItem(item2);
+      cart.clearCart();
+      expect(cart.getItemCount()).toBe(0);
+      expect(cart.getTotalPrice()).toBe(0);
+    });
+  });
+
+  describe('getItemByName', () => {
+    it('should return the item by name', () => {
+      const item1 = new Item('Laptop', 1000);
+      const item2 = new Item('Phone', 800);
+      cart.addItem(item1);
+      cart.addItem(item2);
+      const foundItem = cart.getItemByName('Laptop');
+      expect(foundItem).toEqual(item1);
+    });
+  });
+
+  describe('containsItem', () => {
+    it('should check if the cart contains an item', () => {
+      const item1 = new Item('Laptop', 1000);
+      const item2 = new Item('Phone', 800);
+      cart.addItem(item1);
+      expect(cart.containsItem('Laptop')).toBeTruthy();
+      expect(cart.containsItem('Phone')).toBeFalsy();
+    });
+  });
+});