Error on tests when Enzyme is added

Is this a bug report?

Yes

Can you also reproduce the problem with npm 4.x?

Yes;

Which terms did you search for in User Guide?

I searched about testing, about enzyme and on the troubleshooting page as well.

Environment

1. node -v: v6.11.3
2. npm -v: 4.6.1
3. yarn --version (if you use Yarn): 1.1.0
4. npm ls react-scripts (if you haven’t ejected): react-scripts@1.0.14

Then, specify:

1. Operating system: Windows

Steps to Reproduce

1. npm install -g create-react-app
2. create-react-app test-jest-enzyme
3. cd test-jest-enzyme
4. Change file src/App.test.js to be:

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

it('renders without crashing', () => {
    shallow(<App />);
});

1. npm test

Expected Behavior

The tests would pass and no exception would be thrown.

Actual Behavior

Will give:

          Enzyme Internal Error: Enzyme expects an adapter to be configured, but found none. To
          configure an adapter, you should call `Enzyme.configure({ adapter: new Adapter() })`
          before using any of Enzyme's top level APIs, where `Adapter` is the adapter
          corresponding to the library currently being tested. For example:

          import Adapter from 'enzyme-adapter-react-15';

          To find out more about this, see http://airbnb.io/enzyme/docs/installation/index.html


      at validateAdapter (node_modules/enzyme/build/validateAdapter.js:14:11)
      at Object.<anonymous>.it (src/App.test.js:6:25)

Reproducible Demo

https://gitlab.com/DevLearn/jest-react-broken

[pedro-stanaka]

I can confirm that putting:

import { configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-15';

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

In the src/setupTests.js file solves the issue.

[goozo]

ok, think I fixed it, not sure if it’s the correct way but it works for ejected CRA by adding to package.json jest property :

"jest": {
    ...
    "setupFiles": [
      "<rootDir>/src/setupTests.js"
    ],
    ...
}