[TEST] Add unit test for log body implicit conversions.

[owent]

Fixes #2135

Changes

Please provide a brief description of the changes here.

• Add unit test for log body implicit conversions.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #2136 (9661851) into main (8308fc6) will increase coverage by 0.03%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2136      +/-   ##
==========================================
+ Coverage   87.15%   87.17%   +0.03%     
==========================================
  Files         166      166              
  Lines        4777     4777              
==========================================
+ Hits         4163     4164       +1     
+ Misses        614      613       -1     

see 1 file with indirect coverage changes

[marcalff]

LGTM, thanks for improving the test coverage.