public static void startServer() throws IOException {
    Cache c = CacheFactory.getAnyInstance();
    CacheServerImpl bs = (CacheServerImpl) c.getCacheServers().iterator().next();
    assertThat(bs).isNotNull();
    bs.start();
  }
@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