ui.test.js

/* src/store/__tests__/ui.test.js */
import React from "react";
import Enzyme, { shallow } from "enzyme";
import Adapter from "enzyme-adapter-react-16";

import { Home } from "../../Home";

Enzyme.configure({ adapter: new Adapter() });

it('should display counter value "42"', () => {
  const app = shallow(<Home counter={42} />);
  const counter = app.find({ id: "testCounter" });

  expect(counter.text()).toEqual("42");
});