test(net): improve test coverage

[mbhrznr]

trafficstars

working towards https://github.com/denoland/deno_std/issues/3713. pushes code coverage of the net sub-module to 100%.

[codecov[bot]]

Codecov Report

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

Project coverage is 91.49%. Comparing base (6deab72) to head (450a5f3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4709      +/-   ##
==========================================
+ Coverage   91.48%   91.49%   +0.01%     
==========================================
  Files         477      477              
  Lines       37268    37268              
  Branches     5316     5317       +1     
==========================================
+ Hits        34093    34100       +7     
+ Misses       3119     3112       -7     
  Partials       56       56              

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