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

ReactDOM.render(<input>children</input>, container);
      }).toThrow(
        'input is a void element tag and must not have `children` or use ' +
        '`props.dangerouslySetInnerHTML`.'
      );
    });
    it('should warn against dangerouslySetInnerHTML for void elements', function() {
      ReactDOM.render(<input />, container);
      expect(function() {
        ReactDOM.render(
          <input dangerouslySetInnerHTML={{__html: 'content'}} />,
          container
        );
      }).toThrow(
        'input is a void element tag and must not have `children` or use ' +
        '`props.dangerouslySetInnerHTML`.'
      );
    });
    it('should validate against multiple children props', function() {
      ReactDOM.render(<div></div>, container);
      expect(function() {
        ReactDOM.render(
          <div children="" dangerouslySetInnerHTML={{__html: ''}}></div>,
          container
        );
      }).toThrow(
        'Can only set one of `children` or `props.dangerouslySetInnerHTML`.'
      );
    });
    it('should warn about contentEditable and children', function() {