Lesson 7: Unit test failing - Tx not reverting

[TrudyCyns]

While writing the unit test for fund(), the function is expected to fail due to having sent less ETH than expected. However, when I write the test to handle the function being reverted, it fails with the following error:

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

the test:

describe('fund', async () => {
    it('Should fail if you do not send enough ETH', async () => {
      await expect(fundMe.fund()).to.be.revertedWith('You need to spend more ETH!');
    })
  });

If I write the line as await fundMe.fund(), the test passes.

[adityapadekar]

when you use revertedWith() you need to make sure that the msg matches the message to the one in FundMe.sol

so you should match the message in these parts of code

    function fund() public payable {
        require(
            msg.value.getConversionRate(priceFeed) >= MIN_ACCEPTABLE_VALUE,
            "You need to spend more ETH!"
        );
        funders.push(msg.sender);
        addressToAmountFunded[msg.sender] += msg.value;
    }

   await expect(fundMe.fund()).to.be.revertedWith('You need to spend more ETH!');

and alternatively

    await expect(fundMe.fund()).to.be.reverted

you can opt for any one way