SyntaxError: Unexpected token import at ScriptTransformer._transformAndBuildScript [duplicate] - reactjs

Question

I'm trying to learn how to do unit testing with React and jest. I've run into the following error:
Unexpected token import
Here are my babel presets:
{
"presets": ["es2015", "stage-0", "react"],
"env": {
"test": {
"plugins": ["transform-es2015-modules-commonjs"]
}
}
}
Here is the file i'm trying to test:
import jest from 'jest';
import React from 'react';
import { shallow } from 'enzyme';
import Step from '../src/components/step.js';
const wrapper = shallow(<Step />);
wrapper.find('a').simulate('click', { preventDefault() {} });
and here is my package.json:
{
"name": "react-simple-boilerplate",
"version": "1.0.0",
"description": "Simple and lightweight Boilerplate for ReactJS projects",
"scripts": {
"lint": "eslint src",
"start": "node server.js",
"test": "jest"
},
"devDependencies": {
"babel-core": "^6.24.1",
"babel-loader": "^7.0.0",
"babel-plugin-transform-es2015-modules-commonjs": "^6.26.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"babel-preset-stage-0": "^6.24.1",
"css-loader": "^0.28.0",
"enzyme": "^3.2.0",
"enzyme-adapter-react-16": "^1.1.0",
"eslint": "^3.19.0",
"eslint-plugin-react": "^6.10.3",
"jest": "^21.2.1",
"node-sass": "^4.5.2",
"react-addons-test-utils": "^15.6.2",
"sass-loader": "^6.0.3",
"style-loader": "^0.16.1",
"webpack": "^2.4.1",
"webpack-dev-server": "^2.4.4"
},
"dependencies": {
"babel-loader": "^7.0.0",
"react": "^15.5.4",
"react-dom": "^15.5.4"
},
"main": "server.js"
}
Have no idea why its giving me this message?

Answer 1

It looks like babel-jest is missing among your dependencies. That's why jest is not running babel on your ES6+ code before executing tests.

Answer 2

I'm pretty sure you need to add your babel presets to test as well, jest sets the env variable to test.
So...
"test": {
"plugins": ["transform-es2015-modules-commonjs"],
"presets": ["es2015", "react", "stage-0"]
}