public static void put() {
    Cache cache = new ClientServerMiscDUnitTestBase().getCache();
    Region r1 = cache.getRegion(SEPARATOR + REGION_NAME1);
    Region r2 = cache.getRegion(SEPARATOR + REGION_NAME2);
    assertNotNull(r1);
    assertNotNull(r2);

    r1.put(k1, server_k1);
    r1.put(k2, server_k2);

    r2.put(k1, server_k1);
    r2.put(k2, server_k2);

    assertEquals(r1.getEntry(k1).getValue(), server_k1);
    assertEquals(r1.getEntry(k2).getValue(), server_k2);
    assertEquals(r2.getEntry(k1).getValue(), server_k1);
    assertEquals(r2.getEntry(k2).getValue(), server_k2);
  }
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