ionic-framework/packages/react/test/base/src/setupTests.ts

// jest-dom adds custom jest matchers for asserting on DOM nodes.
// allows you to do things like:
// expect(element).toHaveTextContent(/react/i)
// learn more: https://github.com/testing-library/jest-dom
import { setupIonicReact } from '@ionic/react';

setupIonicReact();

// Mock matchmedia
window.matchMedia = window.matchMedia || function () {
  return {
    matches: false,
    addListener: function () { },
    removeListener: function () { }
  };
};