let store = {}; Object.defineProperty(window, 'localStorage', { writable: true, value: { getItem: jest.fn().mockImplementation((key) => { if(key in store) { return store[key]; } return null; }), setItem: jest.fn().mockImplementation((key, value) => { store[key] = value.toString(); }), clear: jest.fn().mockImplementation(() => { store = {}; }), removeItem: jest.fn().mockImplementation(() => { delete store[key]; }), }, });