service discovery registry protocol unit test

[shanuo0312]

What is the purpose of the change

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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[codecov-commenter]

Codecov Report

Merging #8635 (b5a17e8) into 3.0 (a50810b) will decrease coverage by 0.04%.
The diff coverage is 58.95%.

@@             Coverage Diff              @@
##                3.0    #8635      +/-   ##
============================================
- Coverage     62.96%   62.91%   -0.05%     
  Complexity      313      313              
============================================
  Files          1113     1117       +4     
  Lines         46693    46811     +118     
  Branches       7027     7046      +19     
============================================
+ Hits          29400    29451      +51     
- Misses        14046    14075      +29     
- Partials       3247     3285      +38     

Impacted Files	Coverage Δ
.../rpc/cluster/router/condition/ConditionRouter.java	70.30% <ø> (-0.36%)	⬇️
...rpc/cluster/router/mesh/route/MeshEnvListener.java	0.00% <ø> (ø)
...apache/dubbo/common/constants/CommonConstants.java	100.00% <ø> (ø)
...apache/dubbo/common/extension/ExtensionLoader.java	79.41% <ø> (ø)
...n/java/org/apache/dubbo/config/AbstractConfig.java	81.03% <ø> (ø)
...ain/java/org/apache/dubbo/config/ModuleConfig.java	86.66% <ø> (ø)
...in/java/org/apache/dubbo/config/ServiceConfig.java	70.68% <ø> (-0.36%)	⬇️
...notation/ReferenceAnnotationBeanPostProcessor.java	87.80% <ø> (ø)
...dubbo/config/spring/util/DubboAnnotationUtils.java	48.27% <ø> (ø)
.../client/metadata/ServiceInstanceMetadataUtils.java	81.91% <0.00%> (-3.04%)	⬇️
... and 108 more

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[AlbumenJ]

Please resolve confilct

[chickenlj]

Reopen when conflicts resolved