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

);
    });
    it('should validate use of dangerouslySetInnerHTML', function() {
      expect(function() {
        mountComponent({dangerouslySetInnerHTML: {foo: 'bar'} });
      }).toThrow(
        '`props.dangerouslySetInnerHTML` must be in the form `{__html: ...}`. ' +
        'Please visit https://fb.me/react-invariant-dangerously-set-inner-html for more information.'
      );
    });
    it('should allow {__html: null}', function() {
      expect(function() {
        mountComponent({dangerouslySetInnerHTML: {__html: null} });
      }).not.toThrow();
    });
    it('should warn about contentEditable and children', function() {
      spyOn(console, 'error');
      mountComponent({contentEditable: true, children: ''});
      expect(console.error.argsForCall.length).toBe(1);
      expect(console.error.argsForCall[0][0]).toContain('contentEditable');
    });
    it('should respect suppressContentEditableWarning', function() {
      spyOn(console, 'error');
      mountComponent({contentEditable: true, children: '', suppressContentEditableWarning: true});
      expect(console.error.argsForCall.length).toBe(0);
    });
    it('should validate against invalid styles', function() {
      expect(function() {
        mountComponent({style: 'display: none'});
      }).toThrow(