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

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

describe("Anchor example", () => {
  const provider = anchor.AnchorProvider.env()
  anchor.setProvider(provider)
  const program = anchor.workspace
    .AnchorProgramExample as anchor.Program<AnchorProgramExample>
  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 () => {
    let 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()
  })
})