@material-ui/core/es/test-utils/getClasses.js

React components that implement Google's Material Design.

import React from 'react';
import createShallow from './createShallow';
const shallow = createShallow(); // Helper function to extract the classes from a styleSheet.

export default function getClasses(element) {
  const {
    useStyles
  } = element.type;
  let classes;

  function Listener() {
    classes = useStyles(element.props);
    return null;
  }

  shallow(React.createElement(Listener, null));
  return classes;
}