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

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', function() {
      var container = document.createElement('div');
      ReactDOM.render(<button is="test" cowabunga="chevynova"/>, container);
      expect(container.firstChild.hasAttribute('cowabunga')).toBe(true);
    });
    it('should not update when switching between null/undefined', function() {
      var container = document.createElement('div');
      var node = ReactDOM.render(<div />, container);
      var setter = jest.fn();
      node.setAttribute = setter;
      ReactDOM.render(<div dir={null} />, container);
      ReactDOM.render(<div dir={undefined} />, container);
      ReactDOM.render(<div />, container);
      expect(setter.mock.calls.length).toBe(0);
      ReactDOM.render(<div dir="ltr" />, container);
      expect(setter.mock.calls.length).toBe(1);
    });
    it('handles multiple child updates without interference', function() {
      
      
      
      var container = document.createElement('div');