public static void setHandshakeVersionForTesting() throws Exception {
    ClientSideHandshakeImpl.setVersionForTesting((short) (currentClientVersion + 1));
  }
Verify that server responds to a higher versioned client.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/BackwardCompatibilityHigherVersionClientDUnitTest.java