Hmm, if you have dependencies on infinispan-core test, then it should pick up src/test/resources/log4j.xml from the 'core' module. But that's probably only if you are running tests in the root rather than your specific module.
If you want to run tests in your specific module, you could point to the core log4j.xml (using a system property (if running in an IDE). If running via Maven, you may just want top create src/test/resources/log4j.xml in the module in question.
--
Manik Surtani
Lead, Infinispan
Lead, JBoss Cache