Is there a spec this is associated with?  It seems like being able to swap this between two presumably very different methods without any spec failures is a problem :)

Ah, I found the spec...  pending "REVISIT: creating an instance requires ludicrous amounts of stubbing, and there is relatively little to actually test here.  What to do?  Shared behaviours allow us to push down a lot of the testing into the implementation class tests anyhow..."

I think we could at least check that we're exercising the right method on the target.  Maybe expanding spec/shared_behaviours/store_config_terminus.rb?