gistfile1.txt

pragma solidity ^0.8.12;

interface IERC20 {
    function balanceOf(address account) external view returns (uint256);
    function totalSupply() external view returns (uint256);
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

contract ERC20ConsistentTest {
    function balanceOf(address erc20, address account) external view returns (bool success, uint256 balance) {
        if (isContract(erc20)) {
            success = true;
            balance = IERC20(erc20).balanceOf(account);
        }
    }

    function balanceOfUnchecked(address erc20, address account) external view returns (uint256) {
        return IERC20(erc20).balanceOf(account);
    }

    function isContract(address erc20) public view returns (bool) {
        uint256 size;
        assembly { size := extcodesize(erc20) }
        return size > 0;
    }

    function isContractCode(address erc20) public view returns (bool) {
        return erc20.code.length > 0;
    }

    function totalSupply(address erc20) external view returns (uint256) {
        return IERC20(erc20).totalSupply();
    }

    function transferFrom(address erc20, address account) external returns (bool success) {
        require(IERC20(erc20).transferFrom(account, address(this), 1e18), "transferFrom failed");
        return true;
    }
}