`regeneratorRuntime` is not defined when running Jest test

In case you are using a setupTests.js file you can import regenerator-runtime from there:

// setupTests.js

import 'regenerator-runtime/runtime'
import Enzyme from 'enzyme'
import EnzymeAdapter from 'enzyme-adapter-react-16'

Enzyme.configure({
  adapter: new EnzymeAdapter()
})

 
Then you can import setupTests.js to every test file or better yet, in your package.json just add setupFilesAfterEnv to the jest config:

// package.json

{
  ...
  "dependencies": {
    ...
  },
  "devDependencies": {
    ...
  },
  "jest": {
    "setupFilesAfterEnv": ["./pathToYour/setupTests.js"] 
  }
}

 
Don’t forget to install the regenerator-runtime package:

$ yarn add regenerator-runtime --dev

 
There is no need to import the complete babel-polyfill (or @babel/polyfill if Babel ≥ v.7.0.0) that btw has been deprecated in favor of directly including core-js/stable and regenerator-runtime/runtime.