Refactor testcase

[caojie09]

Motivation:

refactor testcase.

Modification:

refactor testcase.

Result:

refactor testcase.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@bcffe78). Click here to learn what that means.
The diff coverage is 70%.

@@            Coverage Diff            @@
##             master       #2   +/-   ##
=========================================
  Coverage          ?   58.13%           
  Complexity        ?       44           
=========================================
  Files             ?      376           
  Lines             ?    13084           
  Branches          ?     1279           
=========================================
  Hits              ?     7606           
  Misses            ?     4604           
  Partials          ?      874

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/alipay/sofa/registry/net/NetUtil.java	42.85% <70%> (ø)	0 <0> (?)

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