将 React 从 升级0.13到 后v0.14.0-beta3，我在单元测试中收到了很多这样的警告：

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？是否有任何推荐的做法来测试这样的 DOM 元素？