// add `.only` to run only this test, not all.
it.only("allows the owner to burn nfts", async () => {
    // safeTransferFrom
    await cryptoPunks.getPunk(1);
    await cryptoPunks.transferPunk(helper.address, 1);
    await helper.safeTransferFrom(owner.address, ZERO_ADDRESS, 1);
    expect(await cryptoPunks.punkIndexToAddress(1)).to.equal(ZERO_ADDRESS);
    expect(await helper.ownerOf(1)).to.equal(ZERO_ADDRESS);

    // transferFrom
    await cryptoPunks.getPunk(2);
    await cryptoPunks.transferPunk(helper.address, 2);
    await helper.transferFrom(owner.address, ZERO_ADDRESS, 2);
    expect(await cryptoPunks.punkIndexToAddress(2)).to.equal(ZERO_ADDRESS);
    expect(await helper.ownerOf(2)).to.equal(ZERO_ADDRESS);
  });
pragma solidity ^0.8.0;

// for test
import "ds-test/test.sol";
import "forge-std/Vm.sol";

// contracts
import "../test/CryptoPunks.sol";
import "../helpers/CryptoPunksHelper.sol";

contract CryptoPunksHelperTest is DSTest {
    Vm constant vm = Vm(HEVM_ADDRESS);
    
    address owner = address(1);
    address user = address(2);
    
    CryptoPunks private cps;
    CryptoPunksHelper private helper;

    function setUp() public {
        vm.startPrank(owner);
        cps = new CryptoPunks();
        helper = new CryptoPunksHelper();
        helper.initialize(address(cps));
        vm.stopPrank();
    }

    function testOwnerTransferToZero() public {
        //make sure address zero hold no punks
        assertEq(cps.balanceOf(address(0)), 0);

        // safeTransferFrom PoC
        vm.startPrank(owner);
        cps.getPunk(1);
        cps.transferPunk(address(helper), 1);
        helper.safeTransferFrom(owner, address(0), 1);
        assertEq(cps.punkIndexToAddress(1), address(0));
        assertEq(helper.ownerOf(1), address(0));
        assertEq(cps.balanceOf(address(0)), 1);

        // transferFrom PoC
        cps.getPunk(2);
        cps.transferPunk(address(helper), 2);
        helper.transferFrom(owner, address(0), 2);
        assertEq(cps.punkIndexToAddress(2), address(0));
        assertEq(helper.ownerOf(2), address(0));
        assertEq(cps.balanceOf(address(0)), 2);
    }
}
[default]
src = "contracts"
libs = ["lib/forge-std/lib", "lib/", "node_modules"]
solc_version = "0.8.0"
optimizer = false
fuzz_runs = 100000
test = "foundryTest"
