How to access private variables for smart contract testing with mocha/chai

intoverq · May 16, 2021, 5:14pm

How would I access private variables (like a Counter) if I wanted to use them in mocha/chai tests

ERC721PresetMinterPauserAutoId uses also predefined ids for token, but the ids are auto generated.

Would I use a MockERC721PresetMinterPauserAutoId and expose also the private variables with the internal function?

Environment
“@openzeppelin/contracts-upgradeable”: “^4.1.0”,
“truffle”: “^5.3.1”

Details

contract ERC721PresetMinterPauserAutoIdUpgradeable {
   ...
   CountersUpgradeable.Counter private _tokenIdTracker;
   ...
}

Code to reproduce

github.com

OpenZeppelin/openzeppelin-contracts-upgradeable/blob/master/contracts/token/ERC721/presets/ERC721PresetMinterPauserAutoIdUpgradeable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721Upgradeable.sol";
import "../extensions/ERC721EnumerableUpgradeable.sol";
import "../extensions/ERC721BurnableUpgradeable.sol";
import "../extensions/ERC721PausableUpgradeable.sol";
import "../../../access/AccessControlEnumerableUpgradeable.sol";
import "../../../utils/ContextUpgradeable.sol";
import "../../../utils/CountersUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";

/**
 * @dev {ERC721} token, including:
 *
 *  - ability for holders to burn (destroy) their tokens
 *  - a minter role that allows for token minting (creation)
 *  - a pauser role that allows to stop all token transfers
 *  - token ID and URI autogeneration

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github.com

OpenZeppelin/openzeppelin-contracts-upgradeable/blob/master/test/token/ERC721/presets/ERC721PresetMinterPauserAutoId.test.js

const { BN, constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
const { ZERO_ADDRESS } = constants;
const { shouldSupportInterfaces } = require('../../../utils/introspection/SupportsInterface.behavior');

const { expect } = require('chai');

const ERC721PresetMinterPauserAutoId = artifacts.require('ERC721PresetMinterPauserAutoId');

contract('ERC721PresetMinterPauserAutoId', function (accounts) {
  const [ deployer, other ] = accounts;

  const name = 'MinterAutoIDToken';
  const symbol = 'MAIT';
  const baseURI = 'my.app/';

  const DEFAULT_ADMIN_ROLE = '0x0000000000000000000000000000000000000000000000000000000000000000';
  const MINTER_ROLE = web3.utils.soliditySha3('MINTER_ROLE');

  beforeEach(async function () {
    this.token = await ERC721PresetMinterPauserAutoId.new(name, symbol, baseURI, { from: deployer });

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How to access private variables for smart contract testing with mocha/chai

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