Lesson 7: Unit testing is failing

[Astronaut828]

Hello, for some reason all my testing is failing, I have made some changes upon research and according to the course repo but yarn hardhat test continues to throw an error for every test.

$ yarn hardhat test
yarn run v1.22.19

Compiled 8 Solidity files successfully


  FundMe
    constructor
      1) Sets the aggregator address correctly
    fund
      2) Fails if you dont send enough ETH
      3) updated the amount data structure
      - Adds funder to array of funders
    withdraw
      4) Withdraw ETH from a single founder


  0 passing (3s)
  1 pending
  4 failing

  1) FundMe
       constructor
         Sets the aggregator address correctly:
     Error: could not decode result data (value="0x", info={ "method": "priceFeed", "signature": "priceFeed()" }, code=BAD_DATA, version=6.7.0)
      at makeError (node_modules/ethers/src.ts/utils/errors.ts:685:21)
      at assert (node_modules/ethers/src.ts/utils/errors.ts:702:25)
      at Interface.decodeFunctionResult (node_modules/ethers/src.ts/abi/interface.ts:916:15)
      at staticCallResult (node_modules/ethers/src.ts/contract/contract.ts:332:35)
      at processTicksAndRejections (node:internal/process/task_queues:95:5)
      at staticCall (node_modules/ethers/src.ts/contract/contract.ts:289:24)
      at Proxy.priceFeed (node_modules/ethers/src.ts/contract/contract.ts:337:41)
      at Context.<anonymous> (test/unit/FundMe.test.js:29:30)

  2) FundMe
       fund
         Fails if you dont send enough ETH:
     AssertionError: Expected transaction to be reverted with reason 'You need to spend more ETH!', but it didn't revert
      at processTicksAndRejections (node:internal/process/task_queues:95:5)
      at Context.<anonymous> (test/unit/FundMe.test.js:37:13)

  3) FundMe
       fund
         updated the amount data structure:
     Error: could not decode result data (value="0x", info={ "method": "addressToAmountFunded", "signature": "addressToAmountFunded(address)" }, code=BAD_DATA, version=6.7.0)
      at makeError (node_modules/ethers/src.ts/utils/errors.ts:685:21)
      at assert (node_modules/ethers/src.ts/utils/errors.ts:702:25)
      at Interface.decodeFunctionResult (node_modules/ethers/src.ts/abi/interface.ts:916:15)
      at staticCallResult (node_modules/ethers/src.ts/contract/contract.ts:332:35)
      at processTicksAndRejections (node:internal/process/task_queues:95:5)
      at staticCall (node_modules/ethers/src.ts/contract/contract.ts:289:24)
      at Proxy.addressToAmountFunded (node_modules/ethers/src.ts/contract/contract.ts:337:41)
      at Context.<anonymous> (test/unit/FundMe.test.js:43:30)

  4) FundMe
       withdraw
         Withdraw ETH from a single founder:
     TypeError: Cannot read properties of undefined (reading 'getBalance')
      at Context.<anonymous> (test/unit/FundMe.test.js:60:65)


error Command failed with exit code 4.

my current file looks like this:

// Unit tests are done locally
// testing small pieces of the code for correct behavior
const { deployments, ethers, getNamedAccounts } = require("hardhat")
const { assert, expect } = require("chai")

describe("FundMe", function () {
    let fundMe
    let deployer
    let mockV3Aggregator
    const sendValue = ethers.parseEther("1") // 1 ETH

    beforeEach(async function () {
        // deploy our contract
        // using hardhat deploy

        // const accounts = await ethers.getSigners() // another way to get deployer accounts
        // deployer = accounts[0]
        deployer = (await getNamedAccounts()).deployer
        await deployments.fixture(["all"]) // will deploy everything in deploy folder
        fundMe = await ethers.getContractAt("FundMe", deployer) // will get latest deployed contract
        mockV3Aggregator = await ethers.getContractAt(
            "MockV3Aggregator",
            deployer
        )
    })

    describe("constructor", function () {
        it("Sets the aggregator address correctly", async function () {
            const response = await fundMe.priceFeed()
            assert.equal(response, mockV3Aggregator.target);
        })
    })

    describe("fund", function () {
        it("Fails if you dont send enough ETH", async function () {
            /* expecting to fail */
            await expect(fundMe.fund()).to.be.revertedWith(
                "You need to spend more ETH!"
            )
        })
        it("updated the amount data structure", 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.getAddress()
            )
            const startingDeployerBalance = await fundMe.provider.getBalance(
                deployer
            )
            // Act
            const transactionResponse = await fundMe.withdraw()
            const transactionReceipt = await transactionResponse.wait(1)



            const endingFundMeBalance = await fundMe.provider.getBalance(
                fundMe.getAddress()
            )
            const endingDeployerBalance = await fundMe.provider.getBalance(
                deployer
            )
            // Assert
            assert.equal(endingFundMeBalance, 0)
            assert.equal(
                startingFundMeBalance.add(startingDeployerBalance).toString(),
                endingDeployerBalance
            )
        })
    })
})

my updated repo can be found at:
https://github.com/Astronaut828/solidity/tree/main/hh-solidity/hardhat-fund-me

Thank you guys for the help in advance.

[alfaqi]

• first import this line into hardhat.config.js file

require("@nomiclabs/hardhat-ethers")

• instead using getContractAt() use getContract(),

        fundMe = await ethers.getContract("FundMe", deployer) 
        mockV3Aggregator = await ethers.getContract("MockV3Aggregator", deployer)

• you have typo, you have more )

        it("Adds funder to array of funders"),

after modification

        it("Adds funder to array of funders", async function () {
            await fundMe.fund({ value: sendValue })
            const funder = await fundMe.funders(0)
            assert.equal(funder, deployer)
        })

• instead using fundMe.provider use ethers.provider
  like this

    const startingFundMeBalance = await ethers.provider.getBalance(
      fundMe.getAddress()
    )

• ethersV6 changed a lot of things, for exmaple: BigNumber to BigInt, so you don't have BigNumber's functions like add and mul instead of that you can use math operators

[Astronaut828]

@alfaqi, Thank you very much that was pretty frustrating. It's pretty tough to include all the changes when learning it from the course in the first place.