@Override
      public Object call() {
        Region custRegion = getCache().getRegion(CUSTOMER);
        custRegion.getAttributesMutator().addCacheListener(new ClientListener());
        return null;
      }
Tests the basic client-server transaction functionality
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ClientServerTransactionDUnitTest.java