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 <div />;
    }
    var comp = ReactTestUtils.renderIntoDocument(<Child />);
    expect(comp).toBe(null);
  });
  it('should use correct name in key warning', function() {
    function Child() {
      return <div>{[<span />]}</div>;
    }
    spyOn(console, 'error');
    ReactTestUtils.renderIntoDocument(<Child />);
    expect(console.error.argsForCall.length).toBe(1);
    expect(console.error.argsForCall[0][0]).toContain('a unique "key" prop');
    expect(console.error.argsForCall[0][0]).toContain('Child');
  });
  it('should support default props and prop types', function() {
    function Child(props) {