The unified key-management-API is usable and there are two integration tests for the local-file- and the remote-key-server-scenario. However, there are no tests, yet, which check whether the exception handling is correct. We need tests for all (common) errors (e.g. trying to re-initialise an already initialised key-store, using wrong credentials, etc. etc.) and maybe fix the API implementations as well as maybe extend them (in case there are still typed exceptions missing).