Add tests for utils

[dzianis-dashkevich]

Description

Please describe the change as necessary.
If it's a feature or enhancement please be as detailed as possible.
If it's a bug fix, please link the issue that it fixes or describe the bug in as much detail.

Specific Changes proposed

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Requirements Checklist

• Feature implemented / Bug fixed
• Change has been verified in an actual browser (Chrome, Firefox, Safari, Edge) (if applicable)
• Unit Tests updated or fixed (if applicable)
• Docs/guides updated (if applicable)

[github-actions]

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Api Reference

• https://deploy-preview-31--videojsdev.netlify.app/api-reference/dash-parser
• https://deploy-preview-31--videojsdev.netlify.app/api-reference/hls-parser
• https://deploy-preview-31--videojsdev.netlify.app/api-reference/playback

Demo

• https://deploy-preview-31--videojsdev.netlify.app/demo/dash-parser
• https://deploy-preview-31--videojsdev.netlify.app/demo/hls-parser
• https://deploy-preview-31--videojsdev.netlify.app/demo/playback

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.50%. Comparing base (1b98969) to head (a26b2ec).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   65.85%   67.50%   +1.65%     
==========================================
  Files          86       87       +1     
  Lines        3813     3862      +49     
  Branches      501      537      +36     
==========================================
+ Hits         2511     2607      +96     
+ Misses       1299     1252      -47     
  Partials        3        3              

Flag	Coverage Δ
dash-parser	67.50% <100.00%> (+1.65%)	⬆️
hls-parser	67.50% <100.00%> (+1.65%)	⬆️
playback	67.50% <100.00%> (+1.65%)	⬆️

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