How to test with jest?

[jackkinsella]

How does one test the usage of this library using jest?

When I run jest on code that includes this library, I get the following error:

Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

    By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

    Here's what you can do:
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

    Details:

    //resources/lang/de/strings.php:1
    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){<?php
                                                                                             ^

    SyntaxError: Unexpected token <

      3 | export default {
      4 |   // ...
    > 5 |   "de.strings": require("../lang/de/strings.php"),
        |                 ^
      6 |   "en.strings": require("../lang/en/strings.php")
      7 | }
      8 |