Add unit tests for validation

[robertandremitchell]

Description

Had some missing coverage on validation that this ought to address.

Related Issues

Closes #537

Additional Notes

[Add any additional context or notes that reviewers should know about.]

<--------------------- REMOVE THE LINES BELOW BEFORE MERGING --------------------->

Checklist

Please review and complete the following checklist before submitting your pull request:

• I have ensured that the pull request is of a manageable size, allowing it to be reviewed within a single session.
• I have reviewed my changes to ensure they are clear, concise, and well-documented.
• I have updated the documentation, if applicable.
• I have added or updated test cases to cover my changes, if applicable.
• I have minimized the number of reviewers to include only those essential for the review.

Checklist for Reviewers

Please review and complete the following checklist during the review process:

• The code follows best practices and conventions.
• The changes implement the desired functionality or fix the reported issue.
• The tests cover the new changes and pass successfully.
• Any potential edge cases or error scenarios have been considered.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.06%. Comparing base (1110742) to head (5bca9c8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #539      +/-   ##
==========================================
+ Coverage   95.81%   96.06%   +0.25%     
==========================================
  Files          46       46              
  Lines        2339     2339              
==========================================
+ Hits         2241     2247       +6     
+ Misses         98       92       -6     

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