react config test env with jest and create-react-app 1

/.babelrc

 {
   "presets": ["@babel/preset-env","@babel/preset-react"],
   "plugins":[
     "@babel/plugin-proposal-class-properties"
   ]
 }

/jest.config.js

 module.exports = {

   "setupFiles": ["./tests/setup.js"],

   testEnvironment: "node",

 };

/package.json

   "devDependencies": {
     "babel-core": "7.0.0-bridge.0",
     "@babel/core": "^7.1.2",
     "@babel/preset-env": "^7.1.0",
     "@babel/preset-react": "^7.0.0",
     "@babel/plugin-proposal-class-properties": "^7.1.0",
     "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
     "babel-jest": "^23.6.0",
     "enzyme": "/home/rudy/.config/yarn/global/node_modules/enzyme",
     "enzyme-adapter-react-16": "/home/rudy/.config/yarn/global/node_modules/enzyme-adapter-react-16",
     "jest": "^23.6.0"
   },
   "scripts": {
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "jest",
     "eject": "react-scripts eject"
   },

/tests/setup.js

 import { configure } from 'enzyme';
 import Adapter from 'enzyme-adapter-react-16';
 configure({ adapter: new Adapter() });