Owner should be able to withdraw resources paid as rent

Apartment.sol

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "hardhat/console.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract Apartment is ERC20 {
    
    uint public balance;
    constructor() ERC20("ApartmentContract", "APRTM") {
        super._mint(_msgSender(), 100);
        console.log("Deploying a Greeter with greeting:");
       
    }

    function withdraw() public {
        payable(msg.sender).transfer(address(this).balance);
    }

    receive() external payable {
        console.log("receive");
        balance += msg.value;
    }

    
}

index.ts

it("Owner should be able to withdraw resources paid as rent", async () => {
    const Apartment = await ethers.getContractFactory("Apartment");
    const apartment = await Apartment.deploy();

    [owner, Alice, Bob] = await ethers.getSigners();

    await apartment.deployed();
    await apartment.transfer(Alice.address, 20);

    await Bob.sendTransaction({
      to: apartment.address,
      value: ethers.utils.parseEther("1")
    });

    const ownerBalanceBeforeWithdrawal = await owner.getBalance();
    await apartment.withdraw();

    expect(await (await owner.getBalance()).gt(ownerBalanceBeforeWithdrawal)).to.be.true;