Lesson 7 Test leads to TypeError: Cannot read properties of undefined (reading 'JsonRpcProvider')

[PatrickZimmerer]

I'm stuck on lesson 7 I can use yarn hardhat deploy and it deploys to the network I want, no problem. Now when I try to run a yarn hardhat test I always receive this error message:

TypeError: Cannot read properties of undefined (reading 'JsonRpcProvider')
    at Object.<anonymous> (/Users/patrickzimmerer/Solidity/freecodecamp/hardhat-fund-me/node_modules/@nomiclabs/hardhat-ethers/src/internal/ethers-provider-wrapper.ts:4:61)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Object.require.extensions.<computed> [as .js] (/Users/patrickzimmerer/Solidity/freecodecamp/hardhat-fund-me/node_modules/ts-node/src/index.ts:1608:43)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (/Users/patrickzimmerer/Solidity/freecodecamp/hardhat-fund-me/node_modules/@nomiclabs/hardhat-ethers/src/internal/provider-proxy.ts:9:1)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
error Command failed with exit code 1.

Does anyone know where I should start looking?
here's my test file

import { SignerWithAddress } from "@nomiclabs/hardhat-ethers/signers";
import { assert, expect } from "chai";
import { network, deployments, ethers } from "hardhat";
import { developmentChains } from "../../helper-hardhat-config";
import { FundMe, MockV3Aggregator } from "../../typechain-types";

describe("FundMe", function() {
    let fundMe: any;
    let mockV3Aggregator: any;
    let deployer: any;
    const sendValue = ethers.utils.parseEther("1");

    beforeEach(async () => {
        // if you need accounts
        // const accounts = await ethers.getSigners();
        // const accountOne = accounts[0]
        console.log("before each");

        const accounts = await ethers.getSigners();
        deployer = accounts[0];
        await deployments.fixture(["all"]);
        fundMe = await ethers.getContract("FundMe");
        mockV3Aggregator = await ethers.getContract("MockV3Aggregator");
        console.log("went through beforeEach");
    });

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

    describe("fund", 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 data structure", async function() {
            await fundMe.fund({ value: sendValue });
            const response = await fundMe.addressToAmountFunded(deployer);
            assert.equal(response.toString(), sendValue.toString());
        });
        it("Adds fuinder to array of funders", async function() {
            await fundMe.fund({ value: sendValue });
            const funder = await fundMe.funders(0);
            assert.equal(funder, deployer);
        });
    });

    describe("withdraw", function() {
        beforeEach(async () => {
            await fundMe.fund({ value: sendValue });
        });
        it("withdraw ETH from a single founder", async () => {
            // 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
            );
            // Assert
            assert.equal(endingFundMeBalance, 0);
            assert.equal(
                startingFundMeBalance.add(startingDeployerBalance.toString()),
                endingDeployerBalance.add(gasCost).toString()
            );
        });
    });
});

and here's my Repo:
https://github.com/PatrickZimmerer/hardhat-fund-me

[PatrickZimmerer]

So I fixed this by debugging my testfile and it crashed at setting the const sendValue => so the error would have to be in ethers, to resolve this particular error:
1.Go to your package.json and search for ethers which should be on 6.0.2 if you just did yarn add ethers, then just run
2. Run this command =>

yarn add ethers @5.7.2

which should install ethers v 5.7.2 which works just fine.

[bigBagBoogy]

I had the same problem, but the fix yarn add ethers @5.7.2 did not work for me.
I solved it by copying over the complete package.json file from the fcc-repo, running yarn hardhat clean
Then I deleted my node_modules,
then I ran yarn
After that yarn hardhat test worked fine.

[PatrickZimmerer]

yeah running

yarn hardhat clean

has also solved some errors for me in the past, for example, I couldn't deploy my contracts and this solved my problem.

[ProgrammingTemp]

yarn add --dev ethers @5.7.2

Did not work for me.
But

yarn add --dev ethers@5.7.2

Did work

[Dos-leg]

yarn add --dev ethers @5.7.2

Did not work for me. But

yarn add --dev ethers@5.7.2

Did work

sure thing, this is the right command