solana-program-examples/basics/realloc/anchor/tests/anchor-realloc.ts

import * as anchor from '@coral-xyz/anchor';
import type { Program } from '@coral-xyz/anchor';
import { Keypair } from '@solana/web3.js';
import { assert } from 'chai';
import type { AnchorRealloc } from '../target/types/anchor_realloc';

describe('anchor-realloc', () => {
  // Configure the client to use the local cluster.
  const provider = anchor.AnchorProvider.env();
  anchor.setProvider(provider);
  const payer = provider.wallet as anchor.Wallet;
  const connection = provider.connection;

  const program = anchor.workspace.AnchorRealloc as Program<AnchorRealloc>;

  const messageAccount = new Keypair();

  // helper function to check the account data and message
  async function checkAccount(publicKey, expectedMessage) {
    const accountInfo = await connection.getAccountInfo(publicKey);
    const accountData = await program.account.message.fetch(publicKey);

    // 8 bytes for the discriminator,
    // 4 bytes for the length of the message,
    // and the length of the message
    assert.equal(accountInfo.data.length, 8 + 4 + expectedMessage.length);
    assert.equal(accountData.message, expectedMessage);

    console.log(`Account Data Length: ${accountInfo.data.length}`);
    console.log(`Message: ${accountData.message}`);
  }

  it('Is initialized!', async () => {
    const input = 'hello';

    await program.methods
      .initialize(input)
      .accounts({
        payer: payer.publicKey,
        messageAccount: messageAccount.publicKey,
      })
      .signers([messageAccount])
      .rpc();

    await checkAccount(messageAccount.publicKey, input);
  });

  it('Update', async () => {
    const input = 'hello world';

    await program.methods
      .update(input)
      .accounts({
        payer: payer.publicKey,
        messageAccount: messageAccount.publicKey,
      })
      .rpc();

    await checkAccount(messageAccount.publicKey, input);
  });

  it('Update', async () => {
    const input = 'hi';

    await program.methods
      .update(input)
      .accounts({
        payer: payer.publicKey,
        messageAccount: messageAccount.publicKey,
      })
      .rpc();

    await checkAccount(messageAccount.publicKey, input);
  });
});