由于需要DOM，使用reactjs renderIntoDocument进行的测试保持失败

我是reactJS的新手，并尝试学习如何对其进行测试.我已经封装了以下测试util方法.但是我一直收到相同的错误message:ReferenceError: document is not defined.

I am new to reactJS and try to learn how to test with it. I have encouter the following testing util method. However i am keep getting the same error message:ReferenceError: document is not defined.

renderIntoDocument

ReactComponent renderIntoDocument(
  ReactElement instance
)

将组件渲染到文档中的分离DOM节点中.此功能需要一个DOM.

Render a component into a detached DOM node in the document. This function requires a DOM.

注意: 在导入React之前，您将需要在全局范围内使用window，window.document和window.document.createElement.否则，React会认为它无法访问DOM，而setState之类的方法将无法正常工作.

Note: You will need to have window, window.document and window.document.createElement globally available before you import React. Otherwise React will think it can't access the DOM and methods like setState won't work.

我知道这是缺少DOM的原因，但是我该如何插入DOM或要求它呢?

I know it the reason failing its missing the DOM, but how can i insert the DOM or require it?

我的测试如下:

import expect from 'expect.js';
import React from 'react';
import Header from '../../components/header';
import {renderShallow} from './help';
import ReactAddOn from 'react/addons';

var TestUtils = ReactAddOn.addons.TestUtils;

describe('Test react', function() {
  let component;

  beforeEach(()=>{
    component = TestUtils.renderIntoDocument(<Header></Header>);
  });


  it('Test if the content been correclty render', function() {
    console.log(component);
  });
});