So the root cause is UsingStubClientPlatform is broken as it fails to provide a stub client platform.
StubMirConnectionAPI::connect just calls DefaultMirConnectionAPI::connect (prev_api pointer) which will use an instance of DefaultConnectionConfiguration.
It's not currently possible to insert a StubConnectionConfiguration.
So the root cause is UsingStubClient Platform is broken as it fails to provide a stub client platform.
StubMirConnecti onAPI:: connect just calls DefaultMirConne ctionAPI: :connect (prev_api pointer) which will use an instance of DefaultConnecti onConfiguration .
It's not currently possible to insert a StubConnectionC onfiguration.