solana-program-examples/basics/rent/solang/tests/rent.ts

import * as anchor from "@coral-xyz/anchor";
import { Program } from "@coral-xyz/anchor";
import { Rent } from "../target/types/rent";

describe("rent", () => {
  // Configure the client to use the local cluster.
  const provider = anchor.AnchorProvider.env();
  anchor.setProvider(provider);

  // Generate a new keypair for the data account for the program
  const dataAccount = anchor.web3.Keypair.generate();
  const wallet = provider.wallet;
  const connection = provider.connection;

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

  it("Is initialized!", async () => {
    // Initialize data account for the program, which is required by Solang
    const tx = await program.methods
      .new()
      .accounts({ dataAccount: dataAccount.publicKey })
      .signers([dataAccount])
      .rpc();
    console.log("Your transaction signature", tx);
  });

  it("Create new account", async () => {
    // Generate a new keypair for the new account
    const newAccount = anchor.web3.Keypair.generate();
    // Number of bytes of space to allocate for the account
    const space = 100;

    // Create a new account via a Cross Program Invocation to the system program
    const tx = await program.methods
      .createSystemAccount(
        new anchor.BN(space) // space
      )
      .accounts({ 
        payer: wallet.publicKey,
        newAccount: newAccount.publicKey,
       })
      .signers([newAccount]) // new account keypair required as signer
      .rpc();
    console.log("Your transaction signature", tx);
  });
});