Fix #81: Correct broken code coverage setup

[mknaranja]

Merge Request - GuideLine Checklist

Guideline to check code before resolve WIP and approval, respectively.
As many checkboxes as possible should be ticked.

Checks by code author:

Always to be checked:

• There is at least one issue associated with the pull request.
• New code adheres with the coding guidelines
• No large data files have been added to the repository. Maximum size for files should be of the order of KB not MB. In particular avoid adding of pdf, word, or other files that cannot be change-tracked correctly by git.

If functions were changed or functionality was added:

• Tests for new functionality has been added
• A local test was succesful

If new functionality was added:

• There is appropriate documentation of your work. (use doxygen style comments)

If new third party software is used:

• Did you pay attention to its license? Please remember to add it to the wiki after successful merging.

If new mathematical methods or epidemiological terms are used:

• Are new methods referenced? Did you provide further documentation?

[ ] The following questions are addressed in the documentation (if need be):

• Developers (what did you do?, how can it be maintained?)

• For users (how to use your work?)

• For admins (how to install and configure your work?)

• For documentation: Please write or update the Readme in the current working directory!

Checks by code reviewer(s):

• Is the code clean of development artifacts e.g., unnecessary comments, prints, ...
• The ticket goals for each associated issue are reached or problems are clearly addressed (i.e., a new issue was introduced).
• There are appropriate unit tests and they pass.
• The git history is clean and linearized for the merge request. All reviewers should squash commits and write a simple and meaningful commit message.
• Coverage report for new code is acceptable.
• No large data files have been added to the repository. Maximum size for files should be of the order of KB not MB. In particular avoid adding of pdf, word, or other files that cannot be change-tracked correctly by git.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.80%. Comparing base (bba9d5b) to head (403078d).
Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #82       +/-   ##
===========================================
+ Coverage   28.39%   76.80%   +48.41%     
===========================================
  Files          86       61       -25     
  Lines        7020     2302     -4718     
===========================================
- Hits         1993     1768      -225     
+ Misses       5027      534     -4493     

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