Missing test case for custom entity types

[KyleAure]

It looks to me like they are cheating and relying on @Repository(provider = to be assigned the Directory repository,

@Repository(provider = Directory.PERSON_PROVIDER)
public interface Directory extends DataRepository<Person, Long> {

That means the coverage here isn't as good as it should be. We should leave this in place because it's also a valid scenario and create a second repository for Person that omits provider = ... and instead relies on the type of Entity annotation.

Originally posted by @njr-11 in #647 (comment)