react contextTypes jest problem

AppBarButtons-test.jsx

jest.dontMock('../AppBarButtons');
describe('AppBarButtons', function() {
  var React = require('react/addons');
  var AppBarButtons = require('../AppBarButtons');
});

/**
 * FAIL  app\scripts\components\__tests__\AppBarButtons-test.jsx (1.179s)
 * AppBarButtons › it encountered a declaration exception
 * - TypeError: app\scripts\components\AppBarButtons.jsx: undefined is not a function
 *      at app\scripts\components\AppBarButtons.jsx:15:27
 *      at Suite.<anonymous> (app\scripts\components\__tests__\AppBarButtons-test.jsx:7:23)
 *      at env.describe_ (<anonymous>:40:25)
 *      at env.describe (<anonymous>:27:19)
 *      at describe (node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:604:27)
 *      at app\scripts\components\__tests__\AppBarButtons-test.jsx:5:1
 * 1 test failed, 0 tests passed (1 total)
 */

AppBarButtons.jsx

var React = require('react');
var AppBarButtons = React.createClass({
  render () {
    return(<div/>);
  }
});
module.exports = AppBarButtons;