Support enzyme usage with test script

[menzer]

Now that CRA includes a test npm script, with a test environment variable, can #180 be revisited with a test webpack config to enable enzyme usage out of the box?

[gaearon]

You can already use Enzyme with npm test.
Do you have any specific issues?

We don’t need to add anything to Webpack config because we don’t use Webpack for testing.

I ran

npm i --save-dev enzyme react-addons-test-utils
npm test

and replaced App.test.js with

import React from 'react';
import { shallow } from 'enzyme';
import App from './App';

it('renders welcome message', () => {
  const wrapper = shallow(<App />);
  const welcome = <h2>Welcome to React</h2>;
  expect(wrapper.contains(welcome)).toEqual(true);
});

as described in testing guide.

It works:

Have I missed something?

[menzer]

Ah, despite my best efforts to make sure I could reliably repro before opening an issue, I blanked and missed installing react-addons-test-utils in my repro process. I'll close, thanks!

[gaearon]

Yea, that's not super obvious but Enzyme needs it for backward compatibility with React 0.14.