You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_env_builder.rs
    path of file: ./repos/nearcore/chain/client/src/test_utils
    
    the code of the file until where you have to start completion: use super::setup::{setup_client_with_runtime, setup_synchronous_shards_manager};
use super::test_env::TestEnv;
use super::{AccountIndices, TEST_SEED};
use actix_rt::System;
use itertools::{multizip, Itertools};
use near_async::messaging::{IntoMultiSender, IntoSender};
use near_async::time::Clock;
use near_chain::state_snapshot_actor::SnapshotCallbacks;
use near_chain::test_utils::{KeyValueRuntime, MockEpochManager, Val
    
    pub fn real_stores(self) -> Self {
        let ret = self.ensure_home_dirs();
        let stores = ret
            .home_dirs
            .as_ref()
            .unwrap()
            .iter()
            .map(|home_dir| {
                // The max number of open files across all RocksDB instances is INT_MAX i.e. 65,535
                // The default value of max_open_files is 10,000 which only allows upto 6 RocksDB
                // instance to open at a time. This is problematic in testing resharding. To overcome
                // this limit, we set the max_open_files config to 1000.
                let mut store_config = StoreConfig::default();
                store_config.max_open_files = 1000;
                NodeStorage::opener(home_dir.as_path(), false, &store_config, None)
                    .open()
                    .unwrap()
                    .get_hot_store()
            })
            .collect_vec();
        ret.stores(stores)
    }