solana-program-examples/basics/create-account/native/tests/test.ts

import {
  Keypair,
  LAMPORTS_PER_SOL,
  PublicKey,
  SystemProgram,
  Transaction,
  TransactionInstruction,
} from '@solana/web3.js';
import { start } from 'solana-bankrun';
import { describe, test } from 'node:test';

describe('Create a system account', async () => {
  const PROGRAM_ID = PublicKey.unique();
  const context = await start([{ name: 'create_account_program', programId: PROGRAM_ID }],[]);
  const client = context.banksClient;
  const payer = context.payer;

  test('Create the account via a cross program invocation', async () => {
    const newKeypair = Keypair.generate();
    const blockhash = context.lastBlockhash;

    let ix = new TransactionInstruction({
      keys: [
        { pubkey: payer.publicKey, isSigner: true, isWritable: true },
        { pubkey: newKeypair.publicKey, isSigner: true, isWritable: true },
        { pubkey: SystemProgram.programId, isSigner: false, isWritable: false },
      ],
      programId: PROGRAM_ID,
      data: Buffer.alloc(0),
    });

    const tx = new Transaction();
    tx.recentBlockhash = blockhash;
    tx.add(ix).sign(payer, newKeypair);

    await client.processTransaction(tx);
  });

  test('Create the account via direct call to system program', async () => {
    const newKeypair = Keypair.generate();
    const blockhash = context.lastBlockhash;

    const ix = SystemProgram.createAccount({
      fromPubkey: payer.publicKey,
      newAccountPubkey: newKeypair.publicKey,
      lamports: LAMPORTS_PER_SOL,
      space: 0,
      programId: SystemProgram.programId,
    });

    const tx = new Transaction();
    tx.recentBlockhash = blockhash;
    tx.add(ix).sign(payer, newKeypair);

    await client.processTransaction(tx);
    console.log(`Account with public key ${newKeypair.publicKey} successfully created`);
  });
});