test: add converters tests

[maxday]

Description of changes:

add converters tests

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 54.52%. Comparing base (1514151) to head (8c0563b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #525      +/-   ##
============================================
+ Coverage     53.65%   54.52%   +0.86%     
- Complexity      198      202       +4     
============================================
  Files            47       47              
  Lines          1150     1150              
  Branches        149      149              
============================================
+ Hits            617      627      +10     
+ Misses          474      464      -10     
  Partials         59       59              

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