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

import { describe, it } from "node:test";
import * as anchor from "@coral-xyz/anchor";
import { Keypair, PublicKey } from "@solana/web3.js";
import { BankrunProvider } from "anchor-bankrun";
import { assert } from "chai";
import { startAnchor } from "solana-bankrun";
import type { CreateSystemAccount } from "../target/types/create_system_account";

import IDL from "../target/idl/create_system_account.json" with { type: "json" };
const PROGRAM_ID = new PublicKey(IDL.address);

describe("Create a system account", async () => {
  const context = await startAnchor(
    "",
    [{ name: "create_system_account", programId: PROGRAM_ID }],
    [],
  );
  const provider = new BankrunProvider(context);

  const wallet = provider.wallet as anchor.Wallet;
  const program = new anchor.Program<CreateSystemAccount>(IDL, provider);
  const connection = provider.connection;

  it("Create the account", async () => {
    // Generate a new keypair for the new account
    const newKeypair = new Keypair();

    await program.methods
      .createSystemAccount()
      .accounts({
        payer: wallet.publicKey,
        newAccount: newKeypair.publicKey,
      })
      .signers([newKeypair])
      .rpc();

    // Minimum balance for rent exemption for new account
    const lamports = await connection.getMinimumBalanceForRentExemption(0);

    // Check that the account was created
    const accountInfo = await connection.getAccountInfo(newKeypair.publicKey);
    assert(accountInfo.lamports === lamports);
  });
});