Added a dns over udp test

[compscidr]

Was having issues with DNS, added a test for DNS over UDP

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.30%. Comparing base (08e65cd) to head (9a0315d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #32   +/-   ##
=========================================
  Coverage     44.30%   44.30%           
  Complexity      179      179           
=========================================
  Files            15       15           
  Lines          2151     2151           
  Branches        275      275           
=========================================
  Hits            953      953           
  Misses         1054     1054           
  Partials        144      144           

Flag	Coverage Δ
libunittests	44.30% <ø> (ø)

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