light-program-test 0.23.0

A fast local test environment for Solana programs using compressed accounts and tokens.
Documentation 
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use solana_sdk::{
    instruction::Instruction,
    signature::{Keypair, Signer},
    transaction::{Transaction, VersionedTransaction},
};

use crate::{program_test::LightProgramTest, Rpc};

/// Simulate a transaction and return the compute units consumed.
///
/// This is a test utility function for measuring transaction costs.
pub async fn simulate_cu(
    rpc: &mut LightProgramTest,
    payer: &Keypair,
    instruction: &Instruction,
) -> u64 {
    let blockhash = rpc
        .get_latest_blockhash()
        .await
        .expect("Failed to get latest blockhash")
        .0;
    let tx = Transaction::new_signed_with_payer(
        std::slice::from_ref(instruction),
        Some(&payer.pubkey()),
        &[payer],
        blockhash,
    );
    let simulate_tx = VersionedTransaction::from(tx);

    let simulate_result = rpc
        .context
        .simulate_transaction(simulate_tx)
        .unwrap_or_else(|err| panic!("Transaction simulation failed: {:?}", err));

    simulate_result.meta.compute_units_consumed
}