Console Logging

Ref - https://book.getfoundry.sh/reference/forge-std/console-log?highlight=console#console-logging

To log statements, you can use Console from the forge std library

import {console} from "forge-std/Test.sol";

function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        console.log(currentAllowance);
        console.log(owner);
        console.log(spender);

        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }

It has functions like

console.logInt(int i)
console.logUint(uint i)
console.logString(string memory s)
console.logBool(bool b)
console.logAddress(address a)

hoax

hoax is a combination of pranking followd by deal

vm.hoax(address, value);

• address: The address from which the transaction will be sent (it overrides the default sender for the transaction).
• value: The amount of ETH to set on that address

<aside> 💡

The effect of vm.hoax only applies to the current (upcoming) transaction and does not carry over to subsequent transactions. After the transaction completes, the context reverts to the original msg.sender.

</aside>

deal

deal is used to set a specific balance for an address in your test environment. It is useful for testing scenarios where you need to ensure that a particular address has a certain amount of ETH or tokens, or when simulating an account having specific balances before interacting with contracts.

function test_DealExample() public {
    address account = address(0x123);
    uint256 balance = 10 ether;

    // Set the balance of `account` to `10 ether`
    vm.deal(account, balance);

    // Assert that the balance is set correctly
    assertEq(address(account).balance, balance);
}

prank vs startPrank vs stopPrank

vm.prank(address) is a shorthand function that allows you to impersonate an address for just one transaction.

vm.startPrank(address) will start it for all upcoming txns

vm.stopPrank() will stop the prank for all following txns