Feature add unit test

[wujunze]

Feature add unit test

[codecov]

Codecov Report

Merging #304 (1211e9f) into master (ed562e7) will increase coverage by 0.43%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
+ Coverage   58.50%   58.94%   +0.43%     
==========================================
  Files          77       79       +2     
  Lines        2921     2935      +14     
==========================================
+ Hits         1709     1730      +21     
+ Misses       1042     1036       -6     
+ Partials      170      169       -1     

Flag	Coverage Δ
unittests	58.94% <ø> (+0.43%)	⬆️

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

Impacted Files	Coverage Δ
core/util/xnet/ip.go	66.66% <0.00%> (ø)
core/util/xdebug/print.go	25.00% <0.00%> (ø)
core/econf/conf.go	29.41% <0.00%> (+0.73%)	⬆️
core/util/xstring/conv.go	100.00% <0.00%> (+14.28%)	⬆️
server/egin/options.go	84.61% <0.00%> (+46.15%)	⬆️

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