[WIP] Test for VersionLockedObject (VLO).

[pankti-m]

Overview

Description:

Why should this be merged:

Related issue(s) (if applicable): #

Checklist (Definition of Done):

• [ ] There are no TODOs left in the code
• [ ] Coding conventions (e.g. for logging, unit tests) have been followed
• [ ] Change is covered by automated tests
• [ ] Public API has Javadoc