feat: add suit test casses for broker

[Aisuko]

Description

This PR fixes #

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[codecov]

Codecov Report

Patch coverage: 33.33% and project coverage change: +2.72 🎉

Comparison is base (27d580f) 46.13% compared to head (6b04fc2) 48.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #484      +/-   ##
==========================================
+ Coverage   46.13%   48.85%   +2.72%     
==========================================
  Files           6        8       +2     
  Lines         375      438      +63     
==========================================
+ Hits          173      214      +41     
- Misses        191      209      +18     
- Partials       11       15       +4     

Flag	Coverage Δ
unittests	48.85% <33.33%> (+2.72%)	⬆️

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

Impacted Files	Coverage Δ
controllers/broker_controller.go	49.38% <0.00%> (ø)
controllers/meshsync_controller.go	50.57% <0.00%> (ø)
pkg/broker/broker.go	74.54% <100.00%> (ø)

... and 1 file with indirect coverage changes

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