Add some more unit / integration tests

[waf]

Add a few more tests to some uncovered areas of the solution

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.8%. Comparing base (4e9cb65) to head (23406d1).

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #455     +/-   ##
=======================================
+ Coverage   67.1%   70.8%   +3.7%     
=======================================
  Files         90      90             
  Lines       6834    6834             
  Branches     937     937             
=======================================
+ Hits        4588    4842    +254     
+ Misses      1903    1640    -263     
- Partials     343     352      +9     

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