private static void verifyTestDataSerializerNotLoaded() {
    assertFalse("TestDataSerializer should not have been loaded in this vm.",
        TestDataSerializer.successfullyInstantiated);
  }
Register two DataSerializers on the server and verify that they get propagated to client.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/DataSerializerPropagationDUnitTest.java