import MockDate from "mockdate"; const date = new Date("2000-01-01T02:00:00.000"); MockDate.set(date); Object.defineProperty(window, "matchMedia", { writable: true, value: jest.fn().mockImplementation(query => ({ matches: false, media: query, onchange: null, addListener: jest.fn(), // deprecated removeListener: jest.fn(), // deprecated addEventListener: jest.fn(), removeEventListener: jest.fn(), dispatchEvent: jest.fn(), })), });