[test] Add test for VoteBucket

[envestcc]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #4103

Type of change

Please delete options that are not relevant.

• Code refactor or improvement

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [] make test
• [] fullsync
• [] Other test (please specify)

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• [] My code follows the style guidelines of this project
• [] I have performed a self-review of my code
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [] My changes generate no new warnings
• [] I have added tests that prove my fix is effective or that my feature works
• [] New and existing unit tests pass locally with my changes
• [] Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.40%. Comparing base (e1f0636) to head (9e61d8f).
Report is 180 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4138      +/-   ##
==========================================
+ Coverage   75.38%   76.40%   +1.02%     
==========================================
  Files         303      339      +36     
  Lines       25923    28890    +2967     
==========================================
+ Hits        19541    22073    +2532     
- Misses       5360     5715     +355     
- Partials     1022     1102      +80     

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[sonarcloud]

Quality Gate failed

Failed conditions
4.6% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud