Add more tests (Stage 1)

[slifty]

This PR adds additional unit tests to the project, as part of a larger test coverage effort

Related to #33

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.64%. Comparing base (34c8552) to head (a492a1c).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #769      +/-   ##
========================================
+ Coverage   0.59%   3.64%   +3.05%     
========================================
  Files         33      33              
  Lines       1015    1015              
  Branches     158     158              
========================================
+ Hits           6      37      +31     
+ Misses      1009     978      -31     

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