test(helpers): refactor render method

This brings test coverage back to 100%

Author: remarkablemark

test/helpers/index.js

@@ -1,21 +1,11 @@
-const { isValidElement } = require('react');
 const { renderToStaticMarkup } = require('react-dom/server');
-const data = require('./data');
+
+module.exports.data = require('./data');
 
 /**
  * Renders a React element to static HTML markup.
  *
  * @param  {ReactElement} reactElement - The React element.
  * @return {String}                    - The static HTML markup.
  */
-const render = reactElement => {
-  if (!isValidElement(reactElement)) {
-    throw new Error(reactElement, 'is not a valid React element.');
-  }
-  return renderToStaticMarkup(reactElement);
-};
-
-module.exports = {
-  render,
-  data
-};
+module.exports.render = reactElement => renderToStaticMarkup(reactElement);