add test for pkg/controllers/cluster

[xovoxy]

What type of PR is this? /kind failing-test

What this PR does / why we need it: add some test for /pkg/controllers/cluster, improve test coverage to 60 above Which issue(s) this PR fixes: Parts of #https://github.com/karmada-io/karmada/issues/5235

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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Codecov Report

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

Project coverage is 32.33%. Comparing base (136e268) to head (503fb93). Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5467      +/-   ##
==========================================
+ Coverage   31.70%   32.33%   +0.62%     
==========================================
  Files         643      643              
  Lines       44444    44445       +1     
==========================================
+ Hits        14093    14371     +278     
+ Misses      29322    28983     -339     
- Partials     1029     1091      +62     

Flag	Coverage Δ
unittests	32.33% <ø> (+0.62%)	:arrow_up:

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[anujagrawal699]

/lgtm

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/lgtm

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[xovoxy]

hi @XiShanYongYe-Chang, i have made some changes based on your comment. please check it~

[XiShanYongYe-Chang]

Thanks @xovoxy /assign

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: XiShanYongYe-Chang

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