How do I access the properties of an argument passed to an emitted event??

[Equious]

Shameless copypasta from Discord:

I'm trying to confirm that one of the arguments included in the event emitted by my fulfillRandomWords() function is being assigned the correct tokenId, but I'm not sure how to reference it >.>

Here's fulfillRandomWords:

function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal override {
        address nftOwner = s_requestIdToSender[requestId];
        uint256 newTokenId = s_tokenCounter;
        uint256 moddedRng = randomWords[0] % MAX_CHANCE_VALUE;
        Pet currentPet = getPetFromModdedRng(moddedRng);
        s_tokenCounter += s_tokenCounter;
        _safeMint(nftOwner, newTokenId);
        _setTokenURI(newTokenId, s_petTokenUris[uint256(currentPet)]);
        emit NftMint(currentPet, nftOwner);
    }

Here's the test I've tried to write so far >.>

beforeEach(async function () {
                  tokenCounter = await contract.getTokenCounter()
                  VRFCoordinatorV2Mock.fundSubscription(
                      await contract.getSubscriptionId(),
                      sendValue
                  )
                  await contract.requestNFT({ value: sendValue })
                  await network.provider.send("evm_increaseTime", [60])
                  await network.provider.send("evm_mine", [])
              })

it("sets tokenCounter to TokenID and increments it", async function () {
                  const counter = await contract.getTokenCounter()
                  sendValue = ethers.utils.parseEther("30")
                  await expect(counter == tokenCounter + 1)
                  await expect(
                      contract
                          .requestNFT({ value: sendValue })
                          .to.emit(contract, "NftMint")
                          .withArgs({ tokenId: tokenCounter }, deployer.address)
                  )

You can see, I hope, that I'm trying to confirm the event arguments? I think I doubled up on my requestNft() call? >.>
Currently I'm getting the error TypeError: Cannot read properties of undefined reading 'emit')

I dunno, any insight is appreciated greatly.

[krakxn]

Did you import the necessary packages? Let me know if you did, code below in case you did not:

import chai from "chai";
import { solidity } from "ethereum-waffle";

[Equious]

These are my imports for the test script:

const { assert, expect } = require("chai")
const { config } = require("dotenv")
const { network, getNamedAccounts, deployments, ethers } = require("hardhat")
const { developmentChains, networkConfig } = require("../../helper-hardhat-config")

[krakxn]

Test again after including the ones I listed (remove the const { assert, expect } = require("chai"), as it would be redundant with mine) and if it still does not work, let me know.
(BTW - use Node.js notation, ie require keyword instead of import)

[Equious]

Alright, here are the changes I've made:

Require Statements:

const chai = require("chai")
require("ethereum-waffle")
const { config } = require("dotenv")
const { network, getNamedAccounts, deployments, ethers } = require("hardhat")
const { developmentChains, networkConfig } = require("../../helper-hardhat-config")

I won't paste them all, but I've adjusted all my asserts/expects to call chai accordingly:

it("sets tokenCounter to TokenID and increments it", async function () {
                  const counter = await contract.getTokenCounter()
                  await chai.expect(counter == tokenCounter + 1)
                  await chai.expect(
                      contract
                          .requestNFT({ value: sendValue })
                          .to.emit(contract, "NftMint")
                          .withArgs({ tokenId: tokenCounter }, deployer.address)
                  )
                  

Error is the same:

equious@DESKTOP-HTA2B2C:~/Full Stack - JavaScript & Hardhat/hardhat-NFT$ yarn hardhat test
yarn run v1.22.15
warning package.json: No license field
$ '/home/equious/Full Stack - JavaScript & Hardhat/hardhat-NFT/node_modules/.bin/hardhat' test


  Basic NFT Unit Tests
    ✔ Allows users to mint an NFT, and updates appropriately (52ms)

  RandomIpfsNft
    constructor
      ✔ initializes the mintfee correctly
      ✔ initializes the gaslane correctly
    requestMint
      ✔ reverts if msg.value < i_mintFee
      ✔ emits an event when NFT requested
    fulfillRandomWords
      ✔ can only be called with requestMint function
      1) sets tokenCounter to TokenID and increments it
      ✔ emits an event when NFT is minted


  7 passing (6s)
  1 failing

[krakxn]

Uhm - I do not think there is any error in the most recent screenshot? It is just that the test is failing (because of a logical error); also, it was showing TypeError: Cannot read properties of undefined reading 'emit') whereas now I can see two emit tests working fine - so the events are working fine!

Hope this helped

[Equious]

No. The event is failing because of the same emit issue. Here .. let me paste more, I wish this POS would properly upload my images.

equious@DESKTOP-HTA2B2C:~/Full Stack - JavaScript & Hardhat/hardhat-NFT$ yarn hardhat test
yarn run v1.22.15
warning package.json: No license field
$ '/home/equious/Full Stack - JavaScript & Hardhat/hardhat-NFT/node_modules/.bin/hardhat' test


  Basic NFT Unit Tests
    ✔ Allows users to mint an NFT, and updates appropriately (52ms)

  RandomIpfsNft
    constructor
      ✔ initializes the mintfee correctly
      ✔ initializes the gaslane correctly
    requestMint
      ✔ reverts if msg.value < i_mintFee
      ✔ emits an event when NFT requested
    fulfillRandomWords
      ✔ can only be called with requestMint function
      1) sets tokenCounter to TokenID and increments it
      ✔ emits an event when NFT is minted


  7 passing (6s)
  1 failing

  1) RandomIpfsNft
       fulfillRandomWords
         sets tokenCounter to TokenID and increments it:
     TypeError: Cannot read properties of undefined (reading 'emit')
      at Context.<anonymous> (test/unit/randomIpfsNft.test.js:77:30)
      at processTicksAndRejections (node:internal/process/task_queues:96:5)
      at runNextTicks (node:internal/process/task_queues:65:3)
      at listOnTimeout (node:internal/timers:528:9)
      at processTimers (node:internal/timers:502:7)
      
      ```
      
      PS: Please consider joining the discord we set up for this - this back and forth through discussions is HORRIBLE:
      ...even the markup support here is frustrating.

      https://discord.gg/wDCrp9n2Z8