content: import {expect} from 'chai'
  import React from 'react'
  import {createRenderer} from 'react-addons-test-utils'
  
  import HelloWorld from './HelloWorld'
  
  describe('HelloWorld component', () => {
      it('should render correctly', () => {
  
          const renderer = createRenderer()
          // this is a cool usage of HelloWorld variable from an import
          renderer.render(<HelloWorld/>)
  
          const actual = renderer.getRenderOutput()
  
          expect(actual.type).to.equal('div')
          expect(actual.props).to.deep.equal({children: 'Hello world'})
      })
  })