[test] : add unittests for vpc.go file

[rahulait]

General:

• Have you removed all sensitive information, including but not limited to access keys and passwords?
• 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?
5. Are you following the conventions of the language?
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7. Have you explained your rationale for why this feature is needed?
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[komer3]

qq: any reason to not use tabular test format for this?

[rahulait]

ListVPCs() call and its response is changing in each test run, hence I avoided tabular format. Not sure if we can achieve that with tabular format unless we do if/else with bunch of conditions to decide which mock call to use.

[komer3]

Ah i see. I'm okay with that

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.92%. Comparing base (3510bc4) to head (cff5c44).
Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
+ Coverage   56.63%   57.92%   +1.29%     
==========================================
  Files          12       12              
  Lines        2412     2415       +3     
==========================================
+ Hits         1366     1399      +33     
+ Misses        892      864      -28     
+ Partials      154      152       -2     

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[komer3]

LGTM!