@Override
      public Object call() throws Exception {
        createClient(port0);
        return null;
      }
This test creates the following topology

vm0 a peer accessor for both a PR and a replicate region vm1 a peer data store for a replicate
region and a PR vm2 a client of vm0 vm3 a client vm1

The test then performs all region operations in operationVM, while deserialization is prevented
in disallowDeserializationVM.

If an operation causes a deserialization in the disallow VM, this test will fail.
geode-core/src/distributedTest/java/org/apache/geode/pdx/PdxDeserializationDUnitTest.java