feat: Add missing unit-tests for entities and enums

[o-kopysov]

Signed-off-by: Oleg Kopysov [email protected]

Description

We have to cover more classes by unit tests to improve code coverage.
In this PR, missing entity and enum classes are covered by additional unit tests.

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)
• Code cleanup/refactoring
• Documentation update
• This change requires a documentation update
• CI system update
• Test Coverage update

Checklist:

• 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

[tiokim]

LGTM

[tdrozdovsky]

LGTM