public static void getEntries() {
    try {
      LogWriterUtils.getLogWriter().info("Getting entries...");
      Cache cacheClient = GemFireCacheImpl.getInstance();
      Region r3 = cacheClient.getRegion(SEPARATOR + REGION_NAME3);
      r3.get("key-1");
    } catch (Exception ex) {
      ex.printStackTrace();
      Assert.fail("failed while region doing ops", ex);
    }
  }
Get entries on all clients' region 3 since it does not register interest.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/ClientInterestNotifyDistributedTest.java