rmwc: Button displayed as "Unknown" in Snapshot Tests

• What RMWC Version are you using [major.minor.patch]: 5.1.8

• Name your build system [Webpack, Rollup…]: create-react-app-ts

• Describe the bug with as much detail as possible:

Error while executing a test:

    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){export default () => {
                                                                                             ^^^^^^
    SyntaxError: Unexpected token export

Code:

import * as React from 'react';
import { configure, shallow } from 'enzyme';
import * as ReactSixteenAdapter from 'enzyme-adapter-react-16';
// @ts-ignore -> somehow no typescript typings were found for this
import rmwcTestPolyfill from '@rmwc/base/test-polyfill';
configure( {adapter: new ReactSixteenAdapter()} );

rmwcTestPolyfill();

The test fails on the line configure. If I don’t include the call to rmwcTestPolyfill(); though, everything runs through. So I think this issue is with rmwc instead of enzyme.

If I don’t include the polyfill I get Unknown objects in the snapshots though. I hoped that the polyfill would fix that as documented in the Getting started guide. Example:

<Unknown
          dense={true}
          onClick={[Function]}
          raised={true}
>
          Text
</Unknown>

• What happened, and what was supposed to happen:
  • An error occured while executing my tests.
  • The test code should run through.