How to inject log property in Grails 3 unit tests?

I'm trying to upgrade my Grails 2 project to Grails 3. I'm having problems with running tests for code blocks that use logging as it throws NoSuchPropertyException for log property. This was no problem with Grails 2 as the property is automatically injected. How do I get this working in Grails 3? I'm using 3.0.2.