test(core): tests coverage setup

[Matii96]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@5526d41). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage        ?   97.15%           
=======================================
  Files           ?       18           
  Lines           ?      211           
  Branches        ?       27           
=======================================
  Hits            ?      205           
  Misses          ?        6           
  Partials        ?        0           

Flag	Coverage Δ
unittests	97.15% <0.00%> (?)

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