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: transaction_batch.rs
    path of file: ./repos/solana/runtime/src
    
    the code of the file until where you have to start completion: use {
    crate::bank::Bank,
    solana_sdk::transaction::{Result, SanitizedTransaction},
    std::borrow::Cow,
};

// Represents the results of trying to lock a set of accounts
pub struct TransactionBatch<'a, 'b> {
    lock_results: Vec<Result<()>>,
    bank: &'a Bank,
    sanitized_txs: Cow<'b, [SanitizedTransaction]>,
    needs_unlock: bool,
}

impl<'a, 'b> TransactionBatch<'a, 'b> {
    pub fn new(
        lock_results: Vec<Result<()>>,
        bank: &'a Bank,
        sanitized_txs: Cow<'b, [SanitizedTransaction]>,
    ) -> Self {
        assert_eq!(lock_results.len(), sanitized_txs.len());
        Self {
            lock_results,
            bank,
            sanitized_txs,
            needs_unlock: true,
        }
    }

    pub fn lock_results(&self) -> &Vec<Result<()>> {
        &self.lock_results
    }

    pub fn sanitized_transactions(&self) -> &[SanitizedTransaction] {
        &self.sanitized_txs
    }

    pub fn bank(&self) -> &Bank {
        self.bank
    }

    pub fn set_needs_unlock(&mut self, needs_unlock: bool) {
        self.needs_unlock = needs_unlock;
    }


    
    fn setup(insert_conflicting_tx: bool) -> (Bank, Vec<SanitizedTransaction>) {
        let dummy_leader_pubkey = solana_sdk::pubkey::new_rand();
        let GenesisConfigInfo {
            genesis_config,
            mint_keypair,
            ..
        } = create_genesis_config_with_leader(500, &dummy_leader_pubkey, 100);
        let bank = Bank::new_for_tests(&genesis_config);

        let pubkey = solana_sdk::pubkey::new_rand();
        let keypair2 = Keypair::new();
        let pubkey2 = solana_sdk::pubkey::new_rand();

        let mut txs = vec![SanitizedTransaction::from_transaction_for_tests(
            system_transaction::transfer(&mint_keypair, &pubkey, 1, genesis_config.hash()),
        )];
        if insert_conflicting_tx {
            txs.push(SanitizedTransaction::from_transaction_for_tests(
                system_transaction::transfer(&mint_keypair, &pubkey2, 1, genesis_config.hash()),
            ));
        }
        txs.push(SanitizedTransaction::from_transaction_for_tests(
            system_transaction::transfer(&keypair2, &pubkey2, 1, genesis_config.hash()),
        ));

        (bank, txs)
    }