use litesvm::LiteSVM;
use solana_program::{message::Message, pubkey::Pubkey, system_instruction::transfer};
use solana_sdk::{signature::Keypair, signer::Signer, transaction::Transaction};

#[test]
fn system_transfer() {
    let from_keypair = Keypair::new();
    let from = from_keypair.pubkey();
    let to = Pubkey::new_unique();

    let mut svm = LiteSVM::new();
    svm.airdrop(&from, 10_000).unwrap();

    let instruction = transfer(&from, &to, 64);
    let tx = Transaction::new(
        &[&from_keypair],
        Message::new(&[instruction], Some(&from)),
        svm.latest_blockhash(),
    );
    let tx_res = svm.send_transaction(tx).unwrap();

    let from_account = svm.get_account(&from);
    let to_account = svm.get_account(&to);
    assert_eq!(from_account.unwrap().lamports, 4936);
    assert_eq!(to_account.unwrap().lamports, 64);
}