test: add tests for env_unix.go

[gozeloglu]

3 new test cases were added for env_unix.go. I can add more test cases if you want.

Signed-off-by: GitHub gozeloglu@gmail.com

[codecov]

Codecov Report

Merging #211 (fb9b4da) into main (ab39487) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #211   +/-   ##
=======================================
  Coverage   97.97%   97.97%           
=======================================
  Files           2        2           
  Lines         346      346           
=======================================
  Hits          339      339           
  Misses          6        6           
  Partials        1        1           

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[caarlos0]

thanks!