@Override
      public void run2() throws CacheException {
        Region region = cache.getRegion(REGION_NAME);
        region.put(1, 20);
      }
In this test the server is up first.2 Instantiators are registered on it. Verified if the 2
instantiators get propagated to client when client gets connected.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/InstantiatorPropagationDUnitTest.java