Attempt to withdraw by non shareholder should be reverted

index.ts

it("Attempt to withdraw by non shareholder should be reverted", 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 expect(apartment.connect(Bob).withdraw()).to.be.revertedWith("unauthorized");
  })