[test] : add unittest for service controller

[rahulait]

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• Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

Pull Request Guidelines:

1. Does your submission pass tests?
2. Have you added tests?
3. Are you addressing a single feature in this PR?
4. Are your commits atomic, addressing one change per commit?
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7. Have you explained your rationale for why this feature is needed?
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.67%. Comparing base (b1b9af7) to head (dfef941).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #285      +/-   ##
==========================================
+ Coverage   57.92%   58.67%   +0.74%     
==========================================
  Files          12       12              
  Lines        2415     2415              
==========================================
+ Hits         1399     1417      +18     
+ Misses        864      845      -19     
- Partials      152      153       +1     

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