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

import * as anchor from "@project-serum/anchor";
import { AnchorProgramExample } from "../target/types/anchor_program_example";

describe("Anchor example", () => {

  const provider = anchor.AnchorProvider.env();
  anchor.setProvider(provider);
  const program = anchor.workspace.AnchorProgramExample as anchor.Program<AnchorProgramExample>;
  const payer = provider.wallet as anchor.Wallet;

  // We'll create this ahead of time.
  // Our program will try to modify it.
  const accountToChange = anchor.web3.Keypair.generate();
  // Our program will create this.
  const accountToCreate = anchor.web3.Keypair.generate();

  it("Create an account owned by our program", async () => {

    let ix = anchor.web3.SystemProgram.createAccount({
        fromPubkey: provider.wallet.publicKey,
        newAccountPubkey: accountToChange.publicKey,
        lamports: await provider.connection.getMinimumBalanceForRentExemption(0),
        space: 0,
        programId: program.programId, // Our program
    });

    await anchor.web3.sendAndConfirmTransaction(
        provider.connection, 
        new anchor.web3.Transaction().add(ix),
        [payer.payer, accountToChange]
    );
  });

  it("Check accounts", async () => {
    
    await program.methods.checkAccounts()
      .accounts({
        payer: provider.wallet.publicKey,
        accountToCreate: accountToCreate.publicKey,
        accountToChange: accountToChange.publicKey,
        systemProgram: anchor.web3.SystemProgram.programId,
      })
      .signers([payer.payer])
      .rpc();

  });
});