I'm seeing this fairly frequently:

Tests run: 48, Failures: 1, Errors: 0, Skipped: 2, Time elapsed: 117.8 sec <<< FAILURE!
testAddAndRemoveServer(org.jboss.as.test.integration.domain.suites.ServerManagementTestCase) Time elapsed: 6.298 sec <<< FAILURE!
java.lang.AssertionError
at org.junit.Assert.fail(Assert.java:92)
at org.junit.Assert.assertTrue(Assert.java:43)
at org.junit.Assert.assertTrue(Assert.java:54)
at org.jboss.as.test.integration.domain.suites.ServerManagementTestCase.testAddAndRemoveServer(ServerManagementTestCase.java:153)

I'm going to @Ignore the test.