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cargo add --dev anchor-litesvm litesvm litesvm-utils

use anchor_litesvm::AnchorLiteSVM;
use anchor_litesvm::{AssertionHelpers, TestHelpers};
use anchor_lang::system_program;
use solana_sdk::signature::{read_keypair_file, Signer};

// Generate client types from your program's IDL
anchor_lang::declare_program!(my_program);

#[test]
fn test_anchor_program() {
    // One-line setup — reads program keypair for the correct ID
    let program_keypair = read_keypair_file("target/deploy/my_program-keypair.json").unwrap();
    let mut ctx = AnchorLiteSVM::build_with_program(
        program_keypair.pubkey(),
        include_bytes!("../target/deploy/my_program.so"),
    );

    // Create a funded account via TestHelpers on ctx.svm
    let user = ctx.svm.create_funded_account(10_000_000_000).unwrap();

    // Derive PDA
    let seed: u64 = 42;
    let pda = ctx.svm.get_pda(
        &[b"user", user.pubkey().as_ref(), &seed.to_le_bytes()],
        &program_keypair.pubkey(),
    );

    // Build instruction using generated client types
    let ix = ctx.program()
        .accounts(my_program::client::accounts::Initialize {
            user: user.pubkey(),
            user_account: pda,
            system_program: system_program::ID,
        })
        .args(my_program::client::args::Initialize {
            seed,
            name: "test".to_string(),
        })
        .instruction()
        .unwrap();

    // Execute and assert in one chain
    ctx.execute_instruction(ix, &[&user])
        .unwrap()
        .assert_success();

    // Fetch and deserialize the account
    let account: my_program::MyAccount = ctx.get_account(&pda).unwrap();
    assert_eq!(account.name, "test");
}

use litesvm::LiteSVM;
use solana_keypair::Keypair;
use solana_signer::Signer;
use solana_program::instruction::{AccountMeta, Instruction};
use solana_message::Message;
use solana_transaction::Transaction;

let mut svm = LiteSVM::new();
svm.add_program(program_id, program_bytes).unwrap();

let payer = Keypair::new();
svm.airdrop(&payer.pubkey(), 10_000_000_000).unwrap();

// Manually compute 8-byte discriminator
let discriminator = {
    let mut hasher = sha2::Sha256::new();
    hasher.update(b"global:initialize");
    let result = hasher.finalize();
    result[..8].to_vec()
};

// Manually serialize args and build instruction
let mut data = discriminator;
data.extend_from_slice(&borsh::to_vec(&args).unwrap());

let accounts = vec![
    AccountMeta::new(user.pubkey(), true),
    AccountMeta::new(user_pda, false),
    AccountMeta::new_readonly(system_program::id(), false),
];

let ix = Instruction::new_with_bytes(program_id, &data, accounts);
let tx = Transaction::new_signed_with_payer(
    &[ix],
    Some(&payer.pubkey()),
    &[&payer],
    svm.latest_blockhash(),
);
svm.send_transaction(tx).unwrap();

// Manually deserialize with discriminator skip
let account_data = svm.get_account(&pda).unwrap().data;
let account: UserAccount = UserAccount::try_deserialize(
    &mut &account_data[8..]
).unwrap();

use anchor_litesvm::AnchorLiteSVM;

anchor_lang::declare_program!(my_program);

let mut ctx = AnchorLiteSVM::build_with_program(program_id, program_bytes);
let user = ctx.svm.create_funded_account(10_000_000_000).unwrap();

let ix = ctx.program()
    .accounts(my_program::client::accounts::Initialize {
        user: user.pubkey(),
        user_account: user_pda,
        system_program: anchor_lang::system_program::ID,
    })
    .args(my_program::client::args::Initialize { name: "test".to_string() })
    .instruction()
    .unwrap();

ctx.execute_instruction(ix, &[&user]).unwrap().assert_success();

let account: my_program::UserAccount = ctx.get_account(&user_pda).unwrap();