Spring Data: Service layer unit testing?

One of the reasons I like testing my Spring Data repositories is to test that I have defined my JPA mappings correctly. I do not use a mocking framework for these tests, I use the Spring Test framework which actually bootstraps the container allowing me to autowire the actual repository into the Junit test so that I may execute tests against it.

You exactly right. It is clear unit test. And it will never fail (so, it is useless) I think you need at integration test to test real JPA repository with real database (H2 in memory for example) (as I always do).

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