test: improve test coverage

[jescalada]

Improves test coverage on route files and MongoDB handlers.

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✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.31%. Comparing base (2351fa2) to head (e713eb0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1356      +/-   ##
==========================================
+ Coverage   81.25%   90.31%   +9.06%     
==========================================
  Files          65       65              
  Lines        4657     4657              
  Branches      792      857      +65     
==========================================
+ Hits         3784     4206     +422     
+ Misses        858      434     -424     
- Partials       15       17       +2     

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[fabiovincenzi]

Great work! Thanks @jescalada , just a few minor cleanup items.