app.test.js

import { render } from '@testing-library/react';
import './testing/mockRedux.js';
import { MemoryRouter as Router } from 'react-router-dom';

import { App } from './app.js';

describe('the app', () => {
  test('runs', () => {
    const { container } = render(
      <Router initialEntries={['/']}>
        <App />
      </Router>,
    );
    expect(container).toMatchSnapshot();
  });
});