private void validateDS() {
    List list = InternalDistributedSystem.getExistingSystems();
    if (list.size() > 1) {
      logger.info("validateDS: size=" + list.size() + " isDedicatedAdminVM="
          + ClusterDistributionManager.isDedicatedAdminVM() + " l=" + list);
    }
    assertThat(ClusterDistributionManager.isDedicatedAdminVM()).isFalse();
    assertThat(1).isEqualTo(list.size());
  }
Test for client connection loss with CacheLoader Exception on the server.
geode-core/src/distributedTest/java/org/apache/geode/cache/ConnectionPoolDUnitTest.java