feat: add example-test for rating

[0xff-dev]

What type of PR is this?

/kind feature

What this PR does / why we need it

feat: add example-test for rating

Which issue(s) this PR fixes

Fix: https://github.com/kubebb/core/issues/293

Special notes for your reviewer

https://github.com/0xff-dev/core/actions/runs/5973617083/job/16206305101

[codecov[bot]]

Codecov Report

Merging #299 (f2fec1f) into main (491e622) will increase coverage by 5.92%. Report is 10 commits behind head on main. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #299      +/-   ##
==========================================
+ Coverage   15.81%   21.73%   +5.92%     
==========================================
  Files          36       36              
  Lines        4010     4021      +11     
==========================================
+ Hits          634      874     +240     
+ Misses       3339     3092     -247     
- Partials       37       55      +18     

see 7 files with indirect coverage changes

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