This test is occasionally failing on ci.hibernate.org I've verified it is timing related: setting a breakpoint on the right spot the failure is consistent.
http://ci.hibernate.org/job/hibernate-search-PR/org.hibernate$hibernate-search-orm/236/testReport/junit/org.hibernate.search.test.batchindexing/FetchSizeConfigurationTest/testSetFetchSizeOnH2Fails/