ERC721: invalid token ID when trying to connect two smart contracts - blockchain

Question

So I have this contract here named MyToken
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "#openzeppelin/contracts/token/ERC721/ERC721.sol";
import "#openzeppelin/contracts/access/Ownable.sol";
contract MyToken is ERC721, Ownable {
constructor() ERC721("MyToken", "MTK") {}
function safeMint(address to, uint256 tokenId) public onlyOwner {
_safeMint(to, tokenId);
}
}
and I am importing it from another contract named Marketplace
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "./MyToken.sol";
contract Marketplace {
MyToken token= new MyToken();
constructor() {}
function sell(address _address, uint256 tokenId) public {
require(token.ownerOf(tokenId) == msg.sender, "Unauthorized.");
require(_address != address(0));
}
}
And I am trying to do a unit test:
const { expect } = require("chai");
const { ethers } = require("hardhat");
it("should sell the minted token", async function() {
const [owner] = await ethers.getSigners();
const Market = await ethers.getContractFactory("Marketplace");
const marketContract = await Market.deploy();
const Token = await ethers.getContractFactory("MyToken");
const tokenContract = await Token.deploy();
await tokenContract.safeMint(owner.address, 1);
//IT FAILS THE CODE BELOW
await marketContract.sell(tokenContract.address, 1);
})
It seems that it cannot read the token with the ID of 1 when I have minted it with the tokenContract. Then it gives me error that the token ID is invalid because of the require I have provided in the Marketplace. Please help me. Thanks

Answer 1

The issue is that you create a new Token Contract internal to your market, but you don't mint from that one"
// this is the error
MyToken token= new MyToken();
instead take the address for the token in the constructor.
contract Marketplace {
// this is the error
MyToken token= new MyToken();
constructor(MyToken _token) {
token = _token;
}
}
Note: you should additionally probably consider using Owner.sol and adding authorization