Looks like the Clustered EJB section for the test file links are brokken.
https://docs.jboss.org/author/display/AS71/Clustered+EJBs
testcase section:
RemoteEJBClientStatefulBeanFailoverTestCase.java
RemoteEJBClientDDBasedSFSBFailoverTestCase.java
These links work for me. Perhaps you need a github account.