There are intermittent failures in EJB project testsuite (https://svn.jboss.org/repos/jbossas/projects/ejb3/trunk/) run against EAP 5.1.2/5.2.0.ERx.

You can check the test report against 5.2.0.ER6 here:
https://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/eap5-ejb3-testsuite/18/testReport/

Imtermittently failing tests since 5.1.2 - in square brackets I list the JDKs where I encountered a failure, but it is probably not limited to that list:
org.jboss.ejb3.test.clusteredjms.unit.MDBUnitTestCase.testQueue [openjdk7, oracle6, oracle7, openjdk6]
org.jboss.ejb3.test.dd.mdb.unit.MDBUnitTestCase.testQueueA [oracle7, openjdk6]
org.jboss.ejb3.test.dd.mdb.unit.MDBUnitTestCase.testQueueEx [openjdk7, oracle7, oracle6, openjdk6]
org.jboss.ejb3.test.statelesscreation.unit.MetricsUnitTestCase.testThreadLocalPoolJmxMetrics [openjdk6, oracle6]
org.jboss.ejb3.test.statelesscreation.unit.MetricsUnitTestCase.testSLSBCount [openjdk7]

Failures in these tests appeared during 5.2.0.ER6 cycle, possibly regressions:
org.jboss.ejb3.core.test.ejbthree1703.unit.ThreadLocalPoolStatsTestCase.testThreeThreads [oracle6]
org.jboss.ejb3.test.bank.unit.BankDeploymentDescriptorTestCase.testStatefulBank21 [oracle7]
org.jboss.ejb3.test.cache.unit.StatefulUnitTestCase.testStatefulLongRunning [oracle7]
org.jboss.ejb3.test.consumer.unit.ConsumerUnitTestCase.testDeploymentDescriptorQueueXA [openjdk6, openjdk7]
org.jboss.ejb3.test.consumer.unit.ConsumerUnitTestCase.testQueue [oracle7, openjdk7]
org.jboss.ejb3.test.manytomany.unit.EntityUnitTestCase.testManyToMany [openjdk7, oracle7]
org.jboss.ejb3.test.stateful.unit.ExtendedPersistenceUnitTestCase.testXPCSharing [openjdk6]
org.jboss.ejb3.test.stateless.unit.MetricsUnitTestCase.testStrictMaxPoolJmxMetrics [openjdk7, oracle6, openjdk6]