Hum I'm confused here. You test looks like perfect, and it passes too.. but in the logs I'm seeing a bunch of stacktraces which seem related to ORM and/or javassist failing to create our test entity.
Still, it looks like we pass the test.. maybe ORM recovers; there's something not really clean but it doesn't look like your problem.

Test looks great BTW, feels much better to have this covered properly!