Version: **15.0.0-rc.1**
Fiddle: https://jsfiddle.net/69z2wepo/33980/ (check console)

For an example providing `NaN` to a css property will result in "_NaN is an invalid value for the fontSize css style property_".
Now I'm aware that there is an error in my code but I have no idea which component I should check.
I would like to have something like this: "_NaN is an invalid value for the fontSize style property. Check the render method of Header_".
I'll be happy to try to solve this if this is something we want to do.

stub = ReactTestUtils.renderIntoDocument(<App />);
      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(