Jim Richards We just changed the test case templates so that HSEARCH-2380 Open should not affect those anymore. You should be able to set up a test case without getting a NoClassDefFoundError.

So, I've tested this with
Hibernate core 5.2.1.Final
Hibernate core 5.2.6.Final
And it still occurs.

Do you mean that, in your test case, you can reproduce the issue even when using Hibernate ORM 5.2.1.Final? Or that you can reproduce it in your own application when using Hibernate ORM 5.2.1.Final?
Because using the code you included in your first post, everything seems to work fine... Maybe I'm missing something? See this commit on my own copy of the test-case-templates repo and the successful build on Travis)