test: add coverage for utils

[maxday]

Description of changes:
add coverage for util package

Target (OCI, Managed Runtime, both):
both

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.39%. Comparing base (0fe7f67) to head (dbffa70).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #523      +/-   ##
============================================
+ Coverage     50.00%   51.39%   +1.39%     
- Complexity      182      188       +6     
============================================
  Files            47       47              
  Lines          1150     1150              
  Branches        149      149              
============================================
+ Hits            575      591      +16     
+ Misses          518      502      -16     
  Partials         57       57              

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