private boolean hasEmptyBalancerPlans(int[][] mockCluster) {
    Map<ServerName, List<RegionInfo>> servers = mockClusterServers(mockCluster);
    return hasEmptyBalancerPlans(servers);
  }
Data set for testLocalityCost: [test][0][0] = mapping of server to number of regions it hosts
[test][region + 1][0] = server that region is hosted on [test][region + 1][server + 1] =
locality for region on server
hbase-balancer/src/test/java/org/apache/hadoop/hbase/master/balancer/TestStochasticLoadBalancer.java