[improve] enable and fix test src checkstyle

[tomsun28]

What's changed?

enable and fix test src checkstyle

Checklist

• I have read the Contributing Guide
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

Add or update API

• I have added the necessary e2e tests and all cases have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.05%. Comparing base (77f725c) to head (1db1e54).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2610      +/-   ##
============================================
- Coverage     29.07%   29.05%   -0.02%     
  Complexity     1628     1628              
============================================
  Files           431      431              
  Lines         17678    17678              
  Branches       2312     2312              
============================================
- Hits           5139     5137       -2     
- Misses        11953    11955       +2     
  Partials        586      586              

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[zhangshenghang]

LGTM!