Lesson 7 : Unit test error - TypeError: no matching function (argument="key", value="getPriceFeed", code=INVALID_ARGUMENT, version=6.6.7)

[kamalchakma1]

Hi all, from last one day I am facing this error and I tried every solutions given on online forum but still not resolve.

Here is the full code - FundMe.test.js

const { deployments, ethers, getNamedAccounts } = require("hardhat")
const { assert } = require("chai")
describe("FundMe", function () {
    let fundMe
    let deployer
    let mockV3Aggregator
    beforeEach(async function () {
        deployer = (await getNamedAccounts()).deployer
        await deployments.fixture(["all"])
        fundMe = await ethers.getContractAt("FundMe", deployer)
        mockV3Aggregator = await ethers.getContractAt(
            "MockV3Aggregator",
            deployer,
        )
    })

    //constructor
    describe("constructor", function () {
        it("sets the aggregator addresses correctly", async () => {
            const response = await fundMe.getPriceFeed()
            assert.equal(response, mockV3Aggregator.address)
        })
    })
})

And In this function its showing error

//constructor
    describe("constructor", function () {
        it("sets the aggregator addresses correctly", async () => {
            const response = await fundMe.getPriceFeed()
            assert.equal(response, mockV3Aggregator.address)
        })
    })

Can anyone help me on this?

[Nlferu]

Hello @kamalchakma1

Try downgrading your ethers version to "ethers": "^5.5.3".

[kamalchakma1]

Hi @Neftyr i changed ethers version but still im getting same error.

[Nlferu]

@kamalchakma1

Then you have incorrectly downgraded ethers version. Ethers version 6 uses getAddress() function to retrieve the contract address, while the previous version 5 uses .address property. If you are still using ethers 6 (seems like you do) then replace .address with .getAddress() and it should fix your issue

[kamalchakma1]

Hi @Neftyr Thanks for your valuable time. Its resolve.

Here is the steps I have taken to solve it-

1. I did changes like you(@Neftyr ) mentioned i.e to change from .address to .getAddress() .
2. I added await like await mockV3Aggregator.getAddress().
3. I cross check the function(getPriceFeed()) that I am calling is present or not in fundMe.sol

[Nlferu]

@kamalchakma1

Glad I could help, please mark it as answer then ppl with similar issues can find it easier