Warning: ReactDOMComponent: Do not access .props of a DOM node; instead,recreate the props as `render` did originally or read the DOM properties/attributes directly from this node (e.g.,this.refs.Box.className). This DOM node was rendered by `Button`.

它们是由我的单元测试引起的,例如：

it('should render to a <a> when href is given',function () {
    var button = TestUtils.renderIntoDocument(<Button className="amazon" href="#">Hello</Button>);
    expect(TestUtils.scryRenderedDOMComponentsWithTag(button,'button').length).toBe(0);
    expect(TestUtils.scryRenderedDOMComponentsWithTag(button,'a').length).toBe(1);
    expect(TestUtils.scryRenderedDOMComponentsWithTag(button,'a')[0].props.href).toBe('#');
    expect(TestUtils.scryRenderedDOMComponentsWithTag(button,'a')[0].props.className).toBe('amazon Button');
});

我该如何解决？有没有推荐的这样测试DOM元素的做法？