test: add ut for node_event_handler

[jasonliu747]

Signed-off-by: Jason Liu jasonliu747@gmail.com

Ⅰ. Describe what this PR does

add unit test for pkg/slo-controller/nodemetric/node_event_handler.go

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #177 (2dd58b8) into main (25f68bd) will increase coverage by 0.05%.
The diff coverage is 50.00%.

❗ Current head 2dd58b8 differs from pull request most recent head 962fc38. Consider uploading reports for the commit 962fc38 to get more accurate results

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
+ Coverage   58.69%   58.75%   +0.05%     
==========================================
  Files          94       94              
  Lines        8615     8615              
==========================================
+ Hits         5057     5062       +5     
+ Misses       3126     3121       -5     
  Partials      432      432              

Flag	Coverage Δ
unittests	58.75% <50.00%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...kg/slo-controller/nodemetric/node_event_handler.go	13.51% <50.00%> (+13.51%)	⬆️

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[hormes]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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