solana-program-examples/basics/checking-accounts/anchor/tests/test.ts

import * as anchor from "@coral-xyz/anchor";
import {
	Keypair,
	SystemProgram,
	Transaction,
	sendAndConfirmTransaction,
} from "@solana/web3.js";
import type { CheckingAccountProgram } from "../target/types/checking_account_program";

describe("Anchor example", () => {
	const provider = anchor.AnchorProvider.env();
	anchor.setProvider(provider);
	const program = anchor.workspace
		.CheckingAccountProgram as anchor.Program<CheckingAccountProgram>;
	const wallet = provider.wallet as anchor.Wallet;

	// We'll create this ahead of time.
	// Our program will try to modify it.
	const accountToChange = new Keypair();
	// Our program will create this.
	const accountToCreate = new Keypair();

	it("Create an account owned by our program", async () => {
		const instruction = SystemProgram.createAccount({
			fromPubkey: provider.wallet.publicKey,
			newAccountPubkey: accountToChange.publicKey,
			lamports: await provider.connection.getMinimumBalanceForRentExemption(0),
			space: 0,
			programId: program.programId, // Our program
		});

		const transaction = new Transaction().add(instruction);

		await sendAndConfirmTransaction(provider.connection, transaction, [
			wallet.payer,
			accountToChange,
		]);
	});

	it("Check accounts", async () => {
		await program.methods
			.checkAccounts()
			.accounts({
				payer: wallet.publicKey,
				accountToCreate: accountToCreate.publicKey,
				accountToChange: accountToChange.publicKey,
			})
			.rpc();
	});
});