react-assert.js

import React from 'react';
import ReactDOMServer from 'react-dom/server';
import assert from 'assert';

function render(jsx) {
  return ReactDOMServer.renderToStaticMarkup(jsx);
}

function assertEqual(actual, expected) {
  assert.equal(render(actual), render(expected));
}

class HelloWorld extends React.Component {
  render() {
    return <h1>Hello World</h1>;
  }
}

suite('Tests', () => {
  test('some dom', () => {
    assertEqual(
      <HelloWorld/>,
      // should equal:
      <h1>Hello World</h1>
    );
  });
});