React 0.14.7: `<option value="">empty</option>` emits empty string on change
http://jsbin.com/pisita/10/edit?html,js,console,output
React 15.0.0-rc.1`<option value="">empty</option>` emits string with value "empty" on change
http://jsbin.com/bemaze/12/edit?html,js,console,output
This is because React 15.0.0-rc.1 cuts off `value=""` from option tag

return <input>moo</input>;
        },
      });
      var container = document.createElement('div');
      expect(function() {
        ReactDOM.render(<X />, container);
      }).toThrow(
        'input is a void element tag and must not have `children` ' +
        'or use `props.dangerouslySetInnerHTML`. Check the render method of X.'
      );
    });
    it('should support custom elements which extend native elements', function() {
      if (ReactDOMFeatureFlags.useCreateElement) {
        var container = document.createElement('div');
        spyOn(document, 'createElement').andCallThrough();
        ReactDOM.render(<div is="custom-div" />, container);
        expect(document.createElement).toHaveBeenCalledWith('div', 'custom-div');
      } else {
        expect(ReactDOMServer.renderToString(<div is="custom-div" />)).toContain('is="custom-div"');
      }
    });
  });
  describe('updateComponent', function() {
    var container;
    beforeEach(function() {
      container = document.createElement('div');
    });
    it('should warn against children for void elements', function() {
      ReactDOM.render(<input />, container);
      expect(function() {