Allow rendering into the document.body

[NickStefan]

When possible, its good to use the shallow rendering (less overhead).
Other times, we use full jsdom, but only to render into a document fragment (the default for React tests).

I've had some use cases where I actually benefited from rendering into the actual document.body of the jsdom instance.

For example, you can't always avoid using a jquery plugin, and it's easier to test these integrations in an actual body element. Its more overhead, but it's still way way less than running something like selenium / webdriver.

The test I added should demonstrate the API. Basically, its just a new flag, and everything else works as normal, except that you need to call .clean() at the end of the test.

import Test from '../src/legit-tests'
import { expect } from 'chai'

describe('Render into document.body', () => {

  it('should render and clean up component', () => {
    Test(<section />, {fullDOM: true})
    .test(function() {
      expect(global.window.document.querySelector('section'))
      .to.be.okay
    })
    .clean()

    // clean should clean up the document.body
    expect(global.window.document.body.innerHTML).to.equal('')
  })

})

[zackify]

Sounds fine to me. If you could add this to the docs that would be nice

[zackify]

https://github.com/Legitcode/tests/releases/tag/1.1.0