feat: Unit tests

[brian-intel]

PR Checklist

• Added label to the Pull Request for easier discoverability and search
• Commit Message meets guidelines as indicated in the URL https://github.com/intel-retail/core-services/blob/main/CONTRIBUTING.md
• Every commit is a single defect fix and does not mix feature addition or changes
• Unit Tests have been added for new changes
• Updated Documentation as relevant to the changes
• All commented code has been removed
• If you've added a dependency, you've ensured license is compatible with repository license and clearly outlined the added dependency.
• PR change contains code related to security
• PR introduces changes that breaks compatibility with other modules (If YES, please provide details below)

What are you changing?

Issue this PR will close

close: #issue_number

Anything the reviewer should know when reviewing this PR?

Test Instructions if applicable

If the there are associated PRs in other repositories, please link them here (i.e. intel-retail/core-services )