As described on http://facebook.github.io/react/docs/forms.html, the onChange handler of an input should fire when the checked state changes.  However, it actually fires when the radio button is clicked,

In other words, it fails to fire when a checked radio button is unchecked (by checking a different radio button), and it fires even without a state change when a checked radio button is clicked.

In short, it's missing checked transtions true->false, and it's reporting spurious transitions true->true.

style.background = 'green';
      stub.setState({style: {background: 'green'}});
      
      expect(console.error.argsForCall.length).toBe(1);
      style = {background: 'red'};
      var div = document.createElement('div');
      ReactDOM.render(<span style={style}></span>, div);
      style.background = 'blue';
      ReactDOM.render(<span style={style}></span>, div);
      expect(console.error.argsForCall.length).toBe(2);
    });
    it('should warn about styles with numeric string values for non-unitless properties', function() {
      spyOn(console, 'error');
      var div = document.createElement('div');
      var One = React.createClass({
        render: function() {
          return this.props.inline ?
            <span style={{fontSize: '1'}} /> :
            <div style={{fontSize: '1'}} />;
        },
      });
      var Two = React.createClass({
        render: function() {
          return <div style={{fontSize: '1'}} />;
        },
      });
      ReactDOM.render(<One inline={false} />, div);
      expect(console.error.calls.length).toBe(1);
      expect(console.error.argsForCall[0][0]).toBe(
        'Warning: a `div` tag (owner: `One`) was passed a numeric string value ' +