Improve test coverage

[davidk]

This pull should improve test coverage for:

• port_set_test
• poe_set_port

[codecov-commenter]

Codecov Report

Merging #40 (8b41c9f) into main (90321f3) will increase coverage by 2.33%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   39.16%   41.49%   +2.33%     
==========================================
  Files          16       16              
  Lines         858      858              
==========================================
+ Hits          336      356      +20     
+ Misses        511      492      -19     
+ Partials       11       10       -1     

see 2 files with indirect coverage changes

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