public static void registerInterest() {
    Cache cache = new ClientServerMiscDUnitTestBase().getCache();
    Region r = cache.getRegion(SEPARATOR + REGION_NAME2);
    assertNotNull(r);
    r.registerInterest("ALL_KEYS");
    r.getAttributesMutator().addCacheListener(new MemberIDVerifier());
  }
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