RE: https://github.com/facebookincubator/create-react-app/issues/80#issuecomment-235015337 This is what's required for Enzyme compatibility: https://github.com/airbnb/enzyme/blob/master/docs/guides/webpack.md#react-15-compatability ``` js externals: { 'react/addons': true, 'react/lib/ExecutionEnvironment': true, 'react/lib/ReactContext': true } ``` This project doesn't have a test-specific Webpack config, so where should this go?