[DOP-21350] Fix test coverage percentage

[IlyasDevelopment]

Change Summary

The commit in PR #118 led to a 5% decrease in coverage (in particular, it was about worker module). The initial value has now been restored.

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.42%. Comparing base (6f9d6b0) to head (7e4771a).
Report is 76 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #129      +/-   ##
===========================================
+ Coverage    85.70%   90.42%   +4.71%     
===========================================
  Files          157      157              
  Lines         3560     3560              
  Branches       261      261              
===========================================
+ Hits          3051     3219     +168     
+ Misses         445      277     -168     
  Partials        64       64              

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