solana-program-examples/basics/pda-rent-payer/native/program/tests/test.rs

use litesvm::LiteSVM;
use pda_rent_payer_program::instructions::InitRentVaultArgs;
use pda_rent_payer_program::processor::MyInstruction;
use solana_instruction::{AccountMeta, Instruction};
use solana_keypair::{Keypair, Signer};
use solana_native_token::LAMPORTS_PER_SOL;
use solana_pubkey::Pubkey;
use solana_transaction::Transaction;

#[test]
fn test_pda_rent_payer() {
    let program_id = Pubkey::new_unique();
    let program_bytes = include_bytes!("../../tests/fixtures/pda_rent_payer_program.so");

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

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

    let rent_value_pda = Pubkey::find_program_address(&[b"rent_vault"], &program_id).0;

    let args = InitRentVaultArgs {
        fund_lamports: 1000000000,
    };

    let data = borsh::to_vec(&MyInstruction::InitRentVault(args)).unwrap();

    let ix = Instruction {
        program_id,
        accounts: vec![
            AccountMeta::new(rent_value_pda, false),
            AccountMeta::new(payer.pubkey(), true),
            AccountMeta::new(solana_system_interface::program::ID, false),
        ],
        data,
    };

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

    let _ = svm.send_transaction(tx).is_ok();

    let new_account = Keypair::new();

    let data = borsh::to_vec(&MyInstruction::CreateNewAccount).unwrap();

    let ix = Instruction {
        program_id,
        accounts: vec![
            AccountMeta::new(new_account.pubkey(), true),
            AccountMeta::new(rent_value_pda, false),
            AccountMeta::new(solana_system_interface::program::ID, false),
        ],
        data,
    };

    let tx = Transaction::new_signed_with_payer(
        &[ix],
        Some(&payer.pubkey()),
        &[&payer, &new_account],
        svm.latest_blockhash(),
    );

    let _ = svm.send_transaction(tx).is_ok();
}