FundMe.test.js Updates Needed for Ethers 6.x

[PCWCFA]

1) In FundMe.test.js's withdraw test, use

const startingFundMeBalance = await ethers.provider.getBalance(
  fundMe.target,
);

instead of

const startingFundMeBalance = await fundMe.provider.getBalance(
  fundMe.address,
);

The same needs to be applied to all the other balances.

2) Instead of using BigNumber.add, just use BigInt. See https://docs.ethers.org/v6/migrating/#migrate-bigint. You can just add the numbers.

3) Ethers 6.x's receipt now has a fee = gas_price * gas_used, so you no longer need to calculate the fee.

const response = await fundMe.withdraw();
const receipt = await response.wait(1);
...
...
assert.equal((startingDeployerBalance + startingFundMeBalance).toString(),
(endingDeployerBalance + receipt.fee).toString());

[PatrickAlphaC]

ah... thanks. I think we might need to leave it as-is and hope people install the lock.