Test: add some unit-test

[njucjc]

No description provided.

[codecov-commenter]

Codecov Report

Merging #57 (ba0324d) into main (b7f1254) will increase coverage by 39.59%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main      #57       +/-   ##
===========================================
+ Coverage   13.86%   53.46%   +39.59%     
===========================================
  Files           3        3               
  Lines         548      548               
===========================================
+ Hits           76      293      +217     
+ Misses        462      212      -250     
- Partials       10       43       +33     

Flag	Coverage Δ
unittests	53.46% <ø> (+39.59%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/networkengine/vpndriver/libreswan/libreswan.go	46.44% <0.00%> (+11.37%)	⬆️
pkg/networkengine/routedriver/vxlan/utils.go	32.89% <0.00%> (+32.89%)	⬆️
pkg/networkengine/routedriver/vxlan/vxlan.go	65.13% <0.00%> (+64.36%)	⬆️

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