test: Add unit tests for uncovered function

[o-kopysov]

Pull Request

Description

Current PR contains small fixes in the source code and adds new unit tests for functions that are not covered by unit tests.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code cleanup/refactoring
• Documentation update
• This change requires a documentation update
• CI system update
• Test Coverage update

Testing

Local run.

Checklist:

• My code follows the style guidelines of this project
• My code meets the required code coverage for lines (90% and above)
• My code meets the required code coverage for branches (80% and above)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.39%. Comparing base (492db95) to head (2184d5c).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #645      +/-   ##
============================================
+ Coverage     93.89%   94.39%   +0.49%     
- Complexity      640      647       +7     
============================================
  Files            52       52              
  Lines          2195     2193       -2     
  Branches        254      253       -1     
============================================
+ Hits           2061     2070       +9     
+ Misses           58       53       -5     
+ Partials         76       70       -6     

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[Shik-shik]

Approved.

[o-konoval]

Added unit tests. Approved.

[t-naumenko]

LGTM