It should not be possible to withdraw more than one should

index.ts

it("It should not be possible to withdraw more than one should", 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")
    });

    await apartment.connect(Alice).withdraw();
    await expect(apartment.connect(Alice).withdraw()).to.be.revertedWith("0 funds to withdraw");
})