test: exclude test code from code coverage

[michaeladler]

Description

Exclude test code from code coverage

Issues Addressed

List and link all the issues addressed by this PR.

Change Type

Please select the relevant options:

• Bug fix (non-breaking change that resolves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• I have read the CONTRIBUTING document.
• My changes adhere to the established code style, patterns, and best practices.
• I have added tests that demonstrate the effectiveness of my changes.
• I have updated the documentation accordingly (if applicable).
• I have added an entry in the CHANGELOG to document my changes (if applicable).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.17%. Comparing base (8cc2b1f) to head (cf6fefa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   70.34%   80.17%   +9.83%     
==========================================
  Files          99       92       -7     
  Lines        4899     4298     -601     
==========================================
  Hits         3446     3446              
+ Misses       1226      625     -601     
  Partials      227      227              

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