console.log(localStorage) is returning "null"

[Kadessy]

(https://github.com/SuperSimpleDev/javascript-course/assets/92880605/499f5d7c-b17c-4679-a0ad-25c9507c6d20

SCREENSHOT Above

CODE below

import { addToCart, cart } from '../../data/cart.js';

describe('test suite: addToCart', () => {
it('adds and exisiting product to the cart', () => {

});
it('add a new product to the cart', () => {
spyOn(localStorage, 'getItem').and.callFake(() => {
return JSON.stringify({});
});
console.log(localStorage.getItem('cart'));

addToCart('e43638ce-6aa0-4b85-b27f-e1d07eb678c6');
expect(cart.length).toEqual(1);

});
});

From - Lesson 16 (Testing)
Using Jasmine Testing Framework

The above lines of code is supposed to display an empty array in the console since the code is supposed to spyOn locaStorage('getItem')and call fake the cart array, but instead it's returning "null" in the console. I don't know where I went wrong. I need assistance, I have been trying to solve this issue for the past 3 days now.
Thanks.