Unit test coverage expansion

[craigell]

Proposed changes

Increasing the unit test coverage of existing and recently added functionality.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.49%. Comparing base (ae4d2cd) to head (0203237).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1876      +/-   ##
==========================================
+ Coverage   85.20%   85.49%   +0.29%     
==========================================
  Files         105      105              
  Lines       13777    13777              
==========================================
+ Hits        11739    11779      +40     
+ Misses       1514     1474      -40     
  Partials      524      524              

see 2 files with indirect coverage changes

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