Unit tests cover multiple operating systems

The test suite of the software must be executed in all supported operating systems reported in guideline #46 .
Eg: Linux, Mac Os, Windows

Using Continuous Integration on the euroargodev platform, it is fairly easy to implement this guideline by appropriately configuring your github action workflows to be executed on a matrix of operating systems.

Some tutorials/helps on implementing CI on:
- Github: https://carpentries-incubator.github.io/better-research-software/ci-for-testing.html
- Gitlab: https://docs.gitlab.com/ci/testing/