*feature*

>Warning: A component is `contentEditable` and contains `children` managed by React. It is now your responsibility to guarantee that none of those nodes are unexpectedly modified or duplicated. This is probably not intentional.

It would help heaps if I would know _which_ component is causing this.
var nodeValueSetter = jest.fn();
      Object.defineProperty(node, 'checked', {
        get: function() {
          return nodeValue;
        },
        set: nodeValueSetter.mockImplementation(function(newValue) {
          nodeValue = newValue;
        }),
      });
      ReactDOM.render(<div checked={true} />, container);
      expect(nodeValueSetter.mock.calls.length).toBe(0);
      ReactDOM.render(<div />, container);
      expect(nodeValueSetter.mock.calls.length).toBe(1);
      ReactDOM.render(<div checked={false} />, container);
      expect(nodeValueSetter.mock.calls.length).toBe(2);
      ReactDOM.render(<div checked={true} />, container);
      expect(nodeValueSetter.mock.calls.length).toBe(3);
    });
    it('should ignore attribute whitelist for elements with the "is" attribute', () => {
      var container = document.createElement('div');
      ReactDOM.render(<button is="test" cowabunga="chevynova" />, container);
      expect(container.firstChild.hasAttribute('cowabunga')).toBe(true);
    });
    it('should warn about non-string "is" attribute', () => {
      spyOn(console, 'error');
      var container = document.createElement('div');
      ReactDOM.render(<button is={function() {}} />, container);
      expectDev(console.error.calls.count()).toBe(1);
      expectDev(console.error.calls.argsFor(0)[0]).toContain(
        'Received a `function` for string attribute `is`. If this is expected, cast ' +