Error Handling

use litesvm::LiteSVM;
use solana_sdk::{
    signature::{Keypair, Signer},
    system_instruction,
    transaction::{Transaction, TransactionError},
};

#[test]
fn test_insufficient_funds_error() {
    let mut svm = LiteSVM::new();

    let alice = Keypair::new();
    let bob = Keypair::new();

    // Give Alice only 0.5 SOL
    svm.airdrop(&alice.pubkey(), 500_000_000).unwrap();

    // Try to transfer 1 SOL (should fail)
    let transfer_ix = system_instruction::transfer(
        &alice.pubkey(),
        &bob.pubkey(),
        1_000_000_000, // More than Alice has
    );

    let tx = Transaction::new_signed_with_payer(
        &[transfer_ix],
        Some(&alice.pubkey()),
        &[&alice],
        svm.latest_blockhash(),
    );

    // Verify it fails with expected error
    let result = svm.send_transaction(tx);
    assert!(result.is_err());

    let err = result.unwrap_err();
    match err.err {
        TransactionError::InstructionError(0, _) => {
            println!("Got expected error: InstructionError (insufficient funds)");
        }
        _ => panic!("Got unexpected error: {:?}", err.err),
    }

    // Verify no funds were transferred
    assert_eq!(svm.get_balance(&bob.pubkey()).unwrap_or(0), 0);
}

#[test]
fn test_account_not_found() {
    let mut svm = LiteSVM::new();
    let non_existent = Pubkey::new_unique();

    // This should return None
    assert!(svm.get_account(&non_existent).is_none());
}

#[test]
fn test_custom_program_error() {
    let mut svm = LiteSVM::new();

    // Deploy program and trigger custom error
    let result = svm.send_transaction(tx);

    if let Err(e) = result {
        match e.err {
            TransactionError::InstructionError(_, InstructionError::Custom(code)) => {
                assert_eq!(code, YOUR_ERROR_CODE);
            }
            _ => panic!("Expected custom error"),
        }
    }
}