// NameWrapper.sol
 426     /**
 427      * @notice Upgrades a non .eth domain of any kind. Could be a DNSSEC name vitalik.xyz or a subdomain
 428      * @dev Can be called by the owner or an authorised caller
 429      * Requires upgraded Namewrapper to permit old Namewrapper to call `setSubnodeRecord` for all names
 430      * @param parentNode Namehash of the parent name
 431      * @param label Label as a string of the name to upgrade
 432      * @param wrappedOwner Owner of the name in this contract
 433      * @param resolver Resolver contract for this name
 434      */
 435
 436     function upgrade(
 437         bytes32 parentNode,
 438         string calldata label,
 439         address wrappedOwner,
 440         address resolver
 441     ) public {
 442         bytes32 labelhash = keccak256(bytes(label));
 443         bytes32 node = _makeNode(parentNode, labelhash);
 444         (uint32 fuses, uint64 expiry) = _prepareUpgrade(node);
 445         upgradeContract.setSubnodeRecord( 
 446             parentNode,
 447             label,
 448             wrappedOwner,
 449             resolver,
 450             0,
 451             fuses,
 452             expiry
 453         );
 454     }
// Proof of concept


    function testTest2() public {
        // using the mock for upgrade contract
        deployNameWrapperUpgrade();
        string memory node_str = 'vitalik.eth';
        string memory sub1_full = 'sub1.vitalik.eth';
        string memory sub1_str = 'sub1';
        (, bytes32 node) = node_str.dnsEncodeName();
        (bytes memory sub1_dnsname, bytes32 sub1_node) = sub1_full.dnsEncodeName();

        // wrap parent and lock
        vm.prank(user1);
        registrar.setApprovalForAll(address(nameWrapper), true);
        vm.prank(user1);
        nameWrapper.wrapETH2LD('vitalik', user1, type(uint16).max /* all fuses are burned */, address(0));
        // sanity check
        (address owner, uint32 fuses, uint64 expiry) = nameWrapper.getData(uint256(node));
        assertEq(owner, user1);
        assertEq(fuses, PARENT_CANNOT_CONTROL | IS_DOT_ETH | type(uint16).max);
        assertEq(expiry, 2038123728);

        // upgrade as nameWrapper's owner
        vm.prank(root_owner);
        nameWrapper.setUpgradeContract(nameWrapperUpgrade);
        assertEq(address(nameWrapper.upgradeContract()), address(nameWrapperUpgrade));

        // user1 calls upgradeETH2LD
        vm.prank(user1);
        // nameWrapper.upgradeETH2LD('vitalik', address(123) /* new owner */, address(531) /* resolver */);
        // The line below does not revert unless the upgraded NameWrapper has the logic to check the parentNode
        nameWrapper.upgrade(ETH_NODE, 'vitalik', address(123) /* new owner */, address(531) /* resolver */);
    }
