test: add units

[phnx47]

• Add unit tests
• Refactor of internal code

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@788ea7b). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head cc5b221 differs from pull request most recent head 7c5914a. Consider uploading reports for the commit 7c5914a to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##             main       #41   +/-   ##
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  Coverage        ?   100.00%           
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  Files           ?         2           
  Lines           ?        38           
  Branches        ?         8           
========================================
  Hits            ?        38           
  Misses          ?         0           
  Partials        ?         0           

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