Add tests

[lassemand]

Purpose

Add tests to the process as well as run them as part of the pipeline given changes has occurred.

Changes

Property based testing added to process.rs

Checklist

• [x] My code follows the style of this project.
• [x] The code compiles without warnings.
• [x] I have performed a self-review of the changes.
• [x] I have documented my code, in particular the intent of the hard-to-understand areas.
• [x] (If necessary) I have updated the CHANGELOG.