Lesson 7: TypeError: Cannot read properties of undefined (reading 'getBalance')

[shureedshazzad]

I received an error when running a test using yarn hardhat test --grep "withdraw ETH". This is the FundMe.test.js file

const { deployments, ethers, getNamedAccounts } = require("hardhat")
const { assert, expect } = require("chai")
describe("FundMe", async function () {
    let fundMe
    let deployer
    let mockV3Aggregator
    const sendValue = "1000000000000000000"//1 eth
    beforeEach(async function () {
      deployer = (await getNamedAccounts()).deployer;
      const contracts = await deployments.fixture(["all"]);
      const signer = await ethers.getSigner(deployer);
      const fundMeAddress = contracts["FundMe"].address;
      fundMe = await ethers.getContractAt("FundMe", fundMeAddress, signer);
      mockV3Aggregator = contracts["MockV3Aggregator"];
    });
     describe("constructor", async function () {
         it("sets the aggregator addresses correctly", async function () {
             const response = await fundMe.priceFeed()
             assert.equal(response, mockV3Aggregator.address)
         })
    })
    describe("fund", async function(){
        it("Fails if you don't send enough ETH",async function(){
            await expect(fundMe.fund()).to.be.revertedWith(
                "You need to spend more ETH!"
            )
        })
        it("updated the amount funded ds",async function(){
            await fundMe.fund({value: sendValue})
            const response = await fundMe.addressToAmountFunded(
                deployer
            )
            assert.equal(response.toString(), sendValue.toString())
        })
        it("Adds funder to array of funders",async function(){
            await fundMe.fund({value:sendValue});
            const funder =  await fundMe.funders(0);
            assert.equal(funder,deployer);
        })
    })
    describe("withdraw",async function(){
        beforeEach(async function(){
            await fundMe.fund({value:sendValue})
        })
        it("withdraw ETH from a single founder",async function(){
            //arrange
            const startingFundMeBalance = await fundMe.provider.getBalance(
                fundMe.address
            )
            const startingDeployerBalance = await fundMe.provider.getBalance(
                deployer
            )
            //act
            const transactionResponse = await fundMe.withdraw()
            const transactionReceipt = await transactionResponse.wait(1)
            const {gasUsed, effectiveGasPrice} = transactionReceipt
            const gasCost = gasUsed.mul(effectiveGasPrice)
            const endingFundMeBalance = await fundMe.provider.getBalance(
                fundMe.address
            )
            const endingDeployerBalance = await fundMe.provider.getBalance(
                deployer
            )
            //gascost
            //assert
            assert.equal(endingFundMeBalance,0)
            assert.equal(
                startingFundMeBalance.add(startingDeployerBalance).toString(),
                endingDeployerBalance.add(gasCost).toString()
            )  
        })
    })
})

This is the error I received

shureed534@Shureed-PC:~/hardhat_fund_me$ yarn hardhat test --grep "withdraw ETH"
yarn run v1.22.22
warning package.json: No license field
$ /home/shureed534/hardhat_fund_me/node_modules/.bin/hardhat test --grep 'withdraw ETH'

  FundMe
    withdraw

      1) withdraw ETH from a single founder


  0 passing (2s)
  1 failing

  1) FundMe
       withdraw
         withdraw ETH from a single founder:
     TypeError: Cannot read properties of undefined (reading 'getBalance')
      at Context.<anonymous> (test/staging/unit/FundMe.test.js:54:65)



error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

This is the fundMe.sol file

`// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;

import "./AggregatorV3Interface.sol";
import "./PriceConverter.sol";

error NotOwner();

contract FundMe {
    using PriceConverter for uint256;

    mapping(address => uint256) public addressToAmountFunded;
    address[] public funders;

    // Could we make this constant?  /* hint: no! We should make it immutable! */
    address public /* immutable */ i_owner;
    uint256 public constant MINIMUM_USD = 50 * 10 ** 18;
    AggregatorV3Interface public priceFeed;
    
    constructor(address priceFeedAddress) {
        i_owner = msg.sender;
        priceFeed = AggregatorV3Interface(priceFeedAddress);
    }

    function fund() public payable {
        require(msg.value.getConversionRate(priceFeed) >= MINIMUM_USD, "You need to spend more ETH!");
        // require(PriceConverter.getConversionRate(msg.value) >= MINIMUM_USD, "You need to spend more ETH!");
        addressToAmountFunded[msg.sender] += msg.value;
        funders.push(msg.sender);
    }
    
    function getVersion() public view returns (uint256){
        // ETH/USD price feed address of Sepolia Network.;
        return priceFeed.version();
    }
    
    modifier onlyOwner {
        // require(msg.sender == owner);
        if (msg.sender != i_owner) revert NotOwner();
        _;
    }
    
    function withdraw() public onlyOwner {
        for (uint256 funderIndex=0; funderIndex < funders.length; funderIndex++){
            address funder = funders[funderIndex];
            addressToAmountFunded[funder] = 0;
        }
        funders = new address[](0);
        (bool callSuccess, ) = payable(msg.sender).call{value: address(this).balance}("");
        require(callSuccess, "Call failed");
    }
 

    fallback() external payable {
        fund();
    }

    receive() external payable {
        fund();
    }

}`

This is the package.json file:

`{
  "devDependencies": {
    "@chainlink/contracts": "^1.0.0",
    "@nomicfoundation/hardhat-ethers": "^3.0.0",
    "@nomicfoundation/hardhat-ignition": "^0.15.0",
    "@nomicfoundation/hardhat-ignition-ethers": "^0.15.0",
    "@nomicfoundation/hardhat-network-helpers": "^1.0.0",
    "@nomicfoundation/hardhat-toolbox": "^5.0.0",
    "@nomicfoundation/hardhat-verify": "^2.0.0",
    "@nomiclabs/hardhat-ethers": "npm:hardhat-deploy-ethers",
    "@nomiclabs/hardhat-etherscan": "^3.1.8",
    "@typechain/ethers-v6": "^0.5.0",
    "@typechain/hardhat": "^9.0.0",
    "@types/sinon-chai": "^3.2.3",
    "chai": "^4.2.0",
    "ethers": "^6.12.0",
    "hardhat": "^2.22.3",
    "hardhat-deploy": "^0.12.2",
    "hardhat-gas-reporter": "^1.0.8",
    "solidity-coverage": "^0.8.12",
    "typechain": "^8.3.0"
  },
  "dependencies": {
    "@nomicfoundation/hardhat-chai-matchers": "^2.0.6",
    "dotenv": "^16.4.5"
  }
}
`

Would anyone kindly be able to point out what might be incorrect here? I would greatly appreciate your assistance. Thank you in advance.

[jujuvideogirlai]

Hi! Check out this threat 5967, it helped me with the same issue.

Best,

[shureedshazzad]

Thanks, jujuvideogirlai. I've solved the issue. I appreciate your help.