private void createCache(Properties props) {
    DistributedSystem ds = getSystem(props);
    assertThat(ds).isNotNull();
    ds.disconnect();
    ds = getSystem(props);
    cache = CacheFactory.create(ds);
    assertThat(cache).isNotNull();
  }
@param connectedServers is the expected number of connected servers (1 or more)
@param redundantServers is the expected number of redundant servers (0 or more)
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/RedundancyLevelTestBase.java