*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.
suppressContentEditableWarning: true,
      });
      expectDev(console.error.calls.count()).toBe(0);
    });
    it('should validate against invalid styles', () => {
      expect(function() {
        mountComponent({style: 'display: none'});
      }).toThrowError(
        'The `style` prop expects a mapping from style properties to values, ' +
          "not a string. For example, style={{marginRight: spacing + 'em'}} " +
          'when using JSX.',
      );
    });
    it('should track input values', () => {
      var container = document.createElement('div');
      var inst = ReactDOM.render(
        <input type="text" defaultValue="foo" />,
        container,
      );
      var tracker = inputValueTracking._getTrackerFromNode(inst);
      expect(tracker.getValue()).toEqual('foo');
    });
    it('should track textarea values', () => {
      var container = document.createElement('div');
      var inst = ReactDOM.render(<textarea defaultValue="foo" />, container);
      var tracker = inputValueTracking._getTrackerFromNode(inst);
      expect(tracker.getValue()).toEqual('foo');
    });
    it('should warn for children on void elements', () => {
      class X extends React.Component {