Unit testing child workflow and interceptor doesn't seem to send changes to memo

I have been trying to test an interceptor that alters the Memo in the child context when I run a child workflow but when I register both of my unit test workflows (parent and child) the GetChildWorkflowOptions method returns a nil for Memo in the child workflow. Do unit tests impact the registry in a way that changes to child workflow options wouldn’t be passed? I can debug and see the interceptor running, correctly changing the Memo field and invoking the child workflow. I can also see the child workflow executing but the Memo field is empty.

Any suggestions on where to look?

I guess I made a wrong assumption that I would see the memo’s when executing and in when listing/describing executions. It seems they are only available when listing or describing executions.