Upd. Code. Unit tests isolation added.

[Glomberg]

https://app.doboard.com/1/task/38169

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.58%. Comparing base (e485d6d) to head (1a6cfff).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #837      +/-   ##
============================================
- Coverage     27.58%   27.58%   -0.01%     
- Complexity     6043     6052       +9     
============================================
  Files           282      282              
  Lines         25152    25180      +28     
============================================
+ Hits           6939     6946       +7     
- Misses        18213    18234      +21     

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