    function testM4WrappedToUnregistered() public {
        string memory parent = 'vitalik.eth';
        string memory sub1_full = 'sub1.vitalik.eth';
        string memory sub1 = 'sub1';
        (, bytes32 parent_node) = parent.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, uint16(CANNOT_UNWRAP), address(0));
        // checks
        (address owner, uint32 fuses, uint64 expiry) = nameWrapper.getData(uint256(parent_node));
        assertEq(owner, user1);
        assertEq(fuses, PARENT_CANNOT_CONTROL | IS_DOT_ETH | CANNOT_UNWRAP);
        assertEq(expiry, 2038123728);

        // subnode
        vm.prank(user1);
        nameWrapper.setSubnodeOwner(parent_node, 'sub1', user2, PARENT_CANNOT_CONTROL, 1700000000);
        (owner, fuses, expiry) = nameWrapper.getData(uint256(sub1_node));
        assertEq(owner, user2);
        assertEq(fuses, PARENT_CANNOT_CONTROL);
        assertEq(expiry, 1700000000);

        // parent cannot set record on the sub1
        vm.expectRevert(abi.encodeWithSelector(OperationProhibited.selector, sub1_node));
        vm.prank(user1);
        nameWrapper.setSubnodeRecord(parent_node, sub1, user1, address(1), 10, 0, 0);

        // parent: pcc cu
        // child: pcc

        // unwrap sub and set the ens owner to zero -> now parent can change owner
        vm.prank(user2);
        nameWrapper.unwrap(parent_node, _hashLabel(sub1), address(ens));
        assertEq(ens.owner(sub1_node), address(0));

        // sub node has PCC but parent can set owner, resolve and ttl
        vm.prank(user1);
        nameWrapper.setSubnodeRecord(parent_node, sub1, address(246), address(12345), 111111, 0, 0);
        (owner, fuses, expiry) = nameWrapper.getData(uint256(sub1_node));
        assertEq(owner, address(246));
        assertEq(fuses, PARENT_CANNOT_CONTROL);
        assertEq(expiry, 1700000000);
        assertEq(ens.resolver(sub1_node), address(12345));
        assertEq(ens.ttl(sub1_node), 111111);

        // can change fuse as the new owner of sub1
        vm.prank(address(246));
        nameWrapper.setFuses(sub1_node, uint16(CANNOT_UNWRAP));
        (owner, fuses, expiry) = nameWrapper.getData(uint256(sub1_node));
        assertEq(owner, address(246));
        assertEq(fuses, PARENT_CANNOT_CONTROL | CANNOT_UNWRAP);
        assertEq(expiry, 1700000000);
        assertEq(ens.resolver(sub1_node), address(12345));
        assertEq(ens.ttl(sub1_node), 111111);
    }
