add tests

[Felipe Lema]

Describe the bug
The repo is missing tests. Why a repo is should have tests is a given

To Reproduce

Expected behavior

Have tests ran in pull requests

Screenshots

version (please complete the following information):

Additional context

See hadronized#271 for a first approach. Still dunno why was it closed.

[mohsen]

I'm favor of adding it.
could you open the pr here?