@Test
  public void testFailover() {
    Host host = Host.getHost(0);
    VM accessor = host.getVM(0);
    VM datastore = host.getVM(1);
    VM client = host.getVM(2);

    doFailoverWork(accessor, null, datastore, client, true, false);
  }
client has a client, an accessor and a datastore pool connects to the accessor and datastore we
then close the server in the accessor and verify failover
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ClientServerTransactionDUnitTest.java