**Backport:** https://codeberg.org/forgejo/forgejo/pulls/8678
- Even though the test file contains some good extensive testing, it didn't bother to actually call `/login/oauth/access_token` to see if the received code actually resulted into a access token.
- The fix itself is... well yeah self-explanatory.
- Resolvesforgejo/forgejo#8669
Co-authored-by: Gusted <postmaster@gusted.xyz>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8682
Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>