jest.mock('@utilities/localDateTime', () => ({ timestampToLocalDateTime: jest.fn(), })); import { setupRssFetchTime } from '../rssFetchTime'; import { timestampToLocalDateTime } from '@utilities/localDateTime'; describe('RSSFetchTime Tests', () => { beforeAll(async () => { document.body.innerHTML = ''; }); it('timestampToLocalDateTime is called', () => { setupRssFetchTime(); expect(timestampToLocalDateTime).toHaveBeenCalled(); }); });