Hey Jonathan Halliday, that's for that weird reporting of the fact that the C* server is not available:

java.lang.NoClassDefFoundError: Could not initialize class org.hibernate.ogm.utils.TestHelper
at org.hibernate.ogm.backendtck.hibernatecore.HibernateCoreAPIWrappingTest.testWrappedFromEntityManagerAPI(HibernateCoreAPIWrappingTest.java:38)

FWIW, when I run single tests in Eclipse, I am getting a proper stacktrace clearly indicating the connection error.