反应空的classlist属性？

Question

我有新的反应:)

如果我的组件渲染如下所示：

render() {
return (
  <object-search className="m-t-xs">
    <div className="stats-title pull-left">
      <h4>Object Search</h4>

我的测试是：

beforeEach(() => {
    component = TestUtils.renderIntoDocument(<ObjectSearch {...props}/>);
    renderedDOM = () => ReactDOM.findDOMNode(component);
});
it('should render with the correct DOM', () => {
    const parent = renderedDOM();
    expect(parent.tagName).toBe('OBJECT-SEARCH');
    expect(parent.children.length).toBe(7);
    expect(parent.classList[0]).toEqual('m-t-xs');
})

为什么我看到一个空的classList属性？

Home page ObjectSearch Rendering of ObjectSearch on componentDidMount should render with the correct DOM FAILED
Expected '' to equal 'm-t-xs'.

注意：使用karma test runner和jasmine