private static void verifyCacheClientProxyOnServer(String regionName) {
    try {
      Cache cache = new ClientServerMiscDUnitTestBase().getCache();
      assertNull(cache.getRegion(SEPARATOR + regionName));
      verifyCacheClientProxyOnServer();

      // assertIndexDetailsEquals(1,
      // bs.getAcceptor().getCacheClientNotifier().getClientProxies().size());
    } catch (Exception ex) {
      ex.printStackTrace();
      fail("while setting verifyNoCacheClientProxyOnServer  " + ex);
    }
  }
bug 35380: Cycling a DistributedSystem with an initialized pool causes interest registration
NPE

Test Scenario:

Create a DistributedSystem (DS1). Create a pool, initialize (creates a proxy with DS1 memberid)
Disconnect DS1. Create a DistributedSystem (DS2). Create a Region with pool, it attempts to
register interest using DS2 memberid, gets NPE.
geode-dunit/src/main/java/org/apache/geode/internal/cache/tier/sockets/ClientServerMiscDUnitTestBase.java