modal-test.jsx

import assert from 'assert';
import jsdom from 'mocha-jsdom';

let React;
let TestUtils;

describe('Modal test', () => {
  jsdom();

  beforeEach(() => {
    React = require('react');
    TestUtils = require('react-addons-test-utils');
  });

  it('should be able to use TestUtils', () => {
    const Modal = require('react-modal');

    const renderedModal = TestUtils.renderIntoDocument(
      <Modal isOpen={true}>
        <div className="my-modal-class">
          <h1>Hi!</h1>
        </div>
      </Modal>
    );

    const divs = TestUtils.scryRenderedDOMComponentsWithClass(renderedModal.portal, "my-modal-class");
    assert.equal(divs.length, 1);
  });
});