lesson 7 :AssertionError: Expected transaction to be reverted with reason 'You need to spend more ETH', but it didn't revert

[Saurabh-0312]

In lesson 7 hardhat fundme i am currently writing the tests for the contract.
while writing test for fund() function in contract i got an error that the transaction is not reverted

### below is the code for test:

code=>

const { deployments, ethers, getNamedAccounts } = require("hardhat");
const { assert, expect } = 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
        );
    });
    describe("constructor", async function () {
        it("sets the aggregator address correctly", async function () {
            const response = await fundme.address;
            assert.equal(response, mockV3Aggregator.address);
        });
    });

    describe("fund", async function () {
        it.only("fails if you dont send enough eth", async function () {
            await expect(fundme.fund()).to.be.revertedWith(
                "You need to spend more ETH"
            );
        });
    });
});

the fund function in my contract is given below:

function fund() public payable {
        require(
            msg.value.getConversionRate(s_priceFeed) >= MINIMUM_USD,
            "You need to spend more ETH"
        );

        // require(PriceConverter.getConversionRate(msg.value) >= MINIMUM_USD, "You need to spend more ETH!");
        s_addressToAmountFunded[msg.sender] += msg.value;
        s_funders.push(msg.sender);
    }

### the error i am getting is given below:

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 Context. (test/unit/fundme.test.js:26:13)

can any one please give me the solution for the above stated problem............