private static void closeRegion1() {
    try {
      Cache cache = new ClientServerMiscDUnitTestBase().getCache();
      Region<String, String> r1 = cache.getRegion(SEPARATOR + REGION_NAME1);
      assertNotNull(r1);
      r1.close();
    } catch (Exception e) {
      e.printStackTrace();
      fail("Test failed due to Exception during closeRegion1" + e);
    }
  }
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