private void verifyUpdatedEntry(VM memberVM) {
    memberVM.invoke("verify entry updated", () -> Assert.assertTrue(cache
        .getRegion(regionName).containsValue("updatedTestValue")));
  }
This class tests cluster tcp/ip communications both with and without SSL enabled
geode-core/src/upgradeTest/java/org/apache/geode/ClusterCommunicationsDUnitTest.java