TST: add tests for utils

[qianduoduo0904]

What do these changes do?

Related issue number

Fixes #xxxx

Check code requirements

• [ ] tests added / passed (if needed)
• [ ] Ensure all linting tests pass

[codecov[bot]]

Codecov Report

Merging #12 (6e876f8) into main (7d8fe61) will increase coverage by 3.34%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   87.02%   90.37%   +3.34%     
==========================================
  Files          41       41              
  Lines        3199     3199              
  Branches      641      641              
==========================================
+ Hits         2784     2891     +107     
+ Misses        350      228     -122     
- Partials       65       80      +15     

Flag	Coverage Δ
unittests	90.27% <ø> (+3.34%)	:arrow_up:

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see 8 files with indirect coverage changes

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