Unable to mock autowired current_user service

Problem/Motivation

I'm trying to write a Kernel test that uses a service that depends on the @current_user service. That part of the service is not relevant to my test, so I want to just mock it. For some reason this doesn't work, and I think it's related to autowiring.

Steps to reproduce

See test in MR.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet