Integration tests

[gauntl3t12]

Add integration level tests exercising the full configuration format

Covers toml, json, and yaml Additionally added an intentionally malformed configuration & test.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.69%. Comparing base (8ab1b34) to head (1260ca0).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #358      +/-   ##
==========================================
+ Coverage   63.39%   67.69%   +4.30%     
==========================================
  Files          24       24              
  Lines        1557     1560       +3     
==========================================
+ Hits          987     1056      +69     
+ Misses        570      504      -66     

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