lesson 7 fund unit test error

[dhawantomar]

constructor
✓ sets the aggregator addresses correctly
fund

  1) Fail if you don't send enough ETH

1 passing (2s)
1 failing

1. Fund Me
   fund
   Fail if you don't send enough ETH:
   AssertionError: Expected transaction to be reverted with you need to spend more ETH!, but other exception was thrown: Error: VM Exception while processing transaction: reverted with reason string 'You need to spend more ETH!'

this is error when i test

[dhawantomar]

const { getNamedAccounts, deployments, ethers } = require("hardhat");
const { assert, expect } = require("chai");
describe("Fund Me", function () {
let MockV3Aggregator;
let fundMe;
let deployer;

beforeEach(async function () {
deployer = (await getNamedAccounts()).deployer;
await deployments.fixture(["all"]);
fundMe = await ethers.getContract("FundMe", deployer);
MockV3Aggregator = await ethers.getContract("MockV3Aggregator", deployer);
});
describe("constructor", function () {
it("sets the aggregator addresses correctly", async function () {
const response = await fundMe.priceFeed();
expect(response).to.equal(MockV3Aggregator.address);
});
});
describe("fund", function () {
it("Fail if you don't send enough ETH", async function () {
await expect(fundMe.fund()).to.be.revertedWith(
"you need to spend more ETH!"
);
});
});
});

[dhawantomar]

this is my unit test file

[lumiroy]

I had the same problem. Some things I noticed while getting this working:

1. The price returned by chainlink is actually USD/ETH, not ETH/USD as labelled. It's how many dollars to buy one ETH.
2. The price is returned as uint256 with 8 decimals (ie, price * 10**8)
3. Have to be super careful with the decimals. The code stores MINIMUM_USD as dollars * 10**18.
4. If you just brute force a ton of ETH as your sendValue, it will overflow & error out.
5. To pass dev chain tests, make sure your INITIAL_ANSWER for the mock aggs is reasonable. I used 132337000000 which is $1,323.37/ETH.

Hope this helps.

[RoboCrypter]

@dhawantomar : I have made a PR in your ( Hardhat-fund-me ) repo, Merge it and try it out!

After Merging, It should work just fine!

Let me know, If it resolves your issue!