Employee cache fixes 17-11-25 (1)

[Anas-Sneo]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

Fixes # (issue)
This PR is the fix for the issue #88.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Database change

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• Unit Tests
• Integration Tests
• Manual Testing (please describe)

Checklist:

• I have created ADR (Architecture Decision Record) for this change, in case of architecture or tech stack changes.
• My code follows the style guidelines of this project
• I have performed a self-review of my own 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 in other branches have been merged
• I have updated the relevant application properties files (if needed)
• I have updated any necessary database migrations (if needed)

Screenshots (for UX changes):

Additional Notes:

Please add any additional notes, dependencies, or context that reviewers should know about.

[axymthr]

Write a few unit tests to test the cache.