Add global imports for jest

[anxolin]

Add global import support for jest

it was possible before to use global import (instead of relative) for any TS code, but not in tests.

This makes the test to break as soon as you use something with a global import.

This PR fixes this.

[github-actions]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request}

[coveralls]

coverage: 72.617%. remained the same when pulling ac42acb on add-support-global-imports-jest into 4fcd0cc on main.