Rewrite requesttoken.spec.js with Jest

[francoisfreitag]

Jest is a test runner that focuses on simplicity.
It instruments babel to transform modules and test them.

Using Jest simplifies the existing configuration and allows dropping a
bunch of workarounds, as well as following the shared Babel
configuration for new code.

Signed-off-by: François Freitag [email protected]

Closes #27229
Closes #27227

[skjnldsv]

Yes please!! ❤️

[skjnldsv]

Can't thank you enough! It was really becoming complicated with webpack5 and stuff!! 🚀

[francoisfreitag]

Thanks for the review!

I just downgraded the jest-babel and jest version to 26.6.3. The main reason is to make it compatible with vue-jest. The 27.x series change the transformer interface in jest-babel. That causes vue tests from #27008 to fail with:

 FAIL  apps/dav/src/views/CalDavSettings.spec.js
  ● Test suite failed to run

    TypeError: Cannot destructure property 'config' of 'undefined' as it is undefined.

      1 | import { render } from '@testing-library/vue'
      2 | import userEvent from '@testing-library/user-event'
    > 3 | import CalDavSettings from './CalDavSettings'
        | ^
      4 | // eslint-disable-next-line no-unused-vars
      5 | import { generateUrl } from '@nextcloud/router'
      6 |

      at Object.getCacheKey (node_modules/vue-jest/lib/index.js:10:7)
      at ScriptTransformer._getCacheKey (node_modules/@jest/transform/build/ScriptTransformer.js:280:41)
      at ScriptTransformer._getFileCachePath (node_modules/@jest/transform/build/ScriptTransformer.js:351:27)
      at ScriptTransformer.transformSource (node_modules/@jest/transform/build/ScriptTransformer.js:588:32)
      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:758:40)
      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:815:19)
      at Object.<anonymous> (apps/dav/src/views/CalDavSettings.spec.js:3:1)

Also, it avoids using jsdom-global, which allows removing the setupFilesAfterEnv entry and makes the jestBabelTransformer.js slighly simpler by using the export from babel-jest directly instead of aliasing default.