Add tests to evaluation log entries conversion.

[blkt]

Summary

This adds minimal test coverage to evaluation history log entries conversion in order to prevent issues like the one solved by commit 5ad938d.

Change Type

• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

Unit tested.

Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[coveralls]

coverage: 54.398% (+0.2%) from 54.183%
when pulling 579b16b on test/evaluation-history-log-db-conversion
into 8041df2 on main.