add ip unit test

[UnderTreeTech]

No description provided.

[codecov-io]

Codecov Report

Merging #64 (5b45084) into master (18581e2) will increase coverage by 2.94%.
The diff coverage is 77.55%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   58.46%   61.40%   +2.94%     
==========================================
  Files          22       27       +5     
  Lines         691      824     +133     
==========================================
+ Hits          404      506     +102     
- Misses        253      270      +17     
- Partials       34       48      +14     

Impacted Files	Coverage Δ
pkg/utils/xcollection/rollingwindow.go	100.00% <ø> (ø)
pkg/utils/xnet/ip.go	57.14% <ø> (ø)
pkg/utils/xcollection/lru.go	67.44% <67.44%> (ø)
pkg/utils/xsync/singlecall.go	76.47% <76.47%> (ø)
pkg/utils/xcollection/priorityqueue.go	87.87% <87.87%> (ø)
pkg/utils/xsync/waitgroup.go	100.00% <100.00%> (ø)
... and 2 more

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