The PR assumes different approach for test writing than used by me usually (I prefer to find first unused port) but might be useful for some scenarios.

Ok with changes but please update documentation.

Ooops.
Forgot one thing: please add ..versionadded:: 3.0 for port related changes in documentation.

docs added.

different approach for test writing than used by me usually

Same, but sometimes I want to decide the port in a session scoped fixture then use it in a test scoped fixture later.

Codecov Report

Merging #2613 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #2613      +/-   ##
=========================================
+ Coverage    97.9%   97.9%   +<.01%     
=========================================
  Files          38      38              
  Lines        7314    7317       +3     
  Branches     1270    1271       +1     
=========================================
+ Hits         7161    7164       +3     
  Misses         49      49              
  Partials      104     104

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