Split unit test

[oxsean]

What is the purpose of the change

Brief changelog

Verifying this change

Checklist

• [x] 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.
• [ ] Each commit in the pull request should have a meaningful subject line and body.
• [ ] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• [ ] Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• [ ] Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• [ ] Add some description to dubbo-website project if you are requesting to add a feature.
• [ ] GitHub Actions works fine on your own branch.
• [ ] If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 7.14%. Comparing base (a25b21f) to head (ffc1059). Report is 189 commits behind head on 3.3.

:exclamation: Current head ffc1059 differs from pull request most recent head dde73dd

Please upload reports for the commit dde73dd to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##              3.3   #14645       +/-   ##
===========================================
- Coverage   37.65%    7.14%   -30.51%     
===========================================
  Files        1808     7920     +6112     
  Lines       80566   425040   +344474     
  Branches    11971    66678    +54707     
===========================================
+ Hits        30334    30361       +27     
- Misses      45844   390293   +344449     
+ Partials     4388     4386        -2     

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