solana-program-examples/basics/rent/anchor/tests/test.ts

import * as anchor from "@coral-xyz/anchor";
import { RentExample, IDL } from "../target/types/rent_example";

describe("Create a system account", () => {
  const provider = anchor.AnchorProvider.env();
  anchor.setProvider(provider);
  const wallet = provider.wallet as anchor.Wallet;
  const program = anchor.workspace.RentExample as anchor.Program<RentExample>;

  it("Create the account", async () => {
    const newKeypair = anchor.web3.Keypair.generate();

    const addressData: anchor.IdlTypes<RentExample>["AddressData"] = {
      name: "Marcus",
      address: "123 Main St. San Francisco, CA",
    };

    // We're just going to serialize our object here so we can check
    //  the size on the client side against the program logs
    //
    const addressDataBuffer = new anchor.BorshCoder(IDL).types.encode(
      "AddressData",
      addressData
    );
    console.log(`Address data buffer length: ${addressDataBuffer.length}`);

    await program.methods
      .createSystemAccount(addressData)
      .accounts({
        payer: wallet.publicKey,
        newAccount: newKeypair.publicKey,
        systemProgram: anchor.web3.SystemProgram.programId,
      })
      .signers([wallet.payer, newKeypair])
      .rpc();
  });
});