Lesson 9 Raffle unit testing VM Exception while processing transaction: reverted with custom error 'InsufficientBalance()'

[snagiqb]

In lesson 9 raffle unit testing on local hardhat when i run test "it picks a winner ,reset the lottery, and send money" i got very strange error. One thing keep in mind i am running test on local hardhat

i commented out promise to analyze error i found that vrfCoordinatorV2Mock.fulfillRandomWords is not working and reverted with custom error 'InsufficientBalance()'

i checked all other files and folders especially contracts code with github repo of Patrick so all things are fine.

i did console.log to check requestId. it is returning requestId so problem is not in requestId.

const tx = await raffle.performUpkeep([])
const txReceipt = await tx.wait(1)
console.log(txReceipt.events[1].args.requestId)

The problem is in vrfCoordinatorV2Mock.fulfillRandomWords

await vrfCoordinatorV2Mock.fulfillRandomWords(
txReceipt.events[1].args.requestId,
raffle.address
)

My code is under you can ignore the looping part , map and array i did this to automate picking winner rather than hard coding winner but this is not the problem first i tried with Patrick code but got the same error

>  it("it picks a winner ,reset the lottery, and send money", async function () {
>                   const additionalEntrants = 3
>                   const startingAccountIndex = 1 //deployer 0
>                   const accounts = await ethers.getSigners()
>                   const accountsArray = new Array()
>                   const balanceMap = new Map()
>                   let accountBalance
>                   let accountAddress
>                   for (
>                       let i = startingAccountIndex;
>                       i < startingAccountIndex + additionalEntrants;
>                       i++
>                   ) {
>                       const accountConnectedRaffle = await raffle.connect(accounts[i])
>                       await accountConnectedRaffle.enterRaffle({ value: entranceFee })
>                       //storing accounts address in array
>                       accountAddress = accounts[i].address
>                       accountsArray.push(accountAddress.toString())
>                       //storing account balances in array
>                       accountBalance = await accounts[i].getBalance()
>                       balanceMap.set(accountAddress.toString(), accountBalance.toString())
>                   }
>                   console.log(accountsArray)
>                   console.log(balanceMap)
>                   const startingTimeStamp = await raffle.getLatestTimeStamp()
>                   //   let winnerAddress
>                   //   await new Promise(async (resolve, reject) => {
>                   //       raffle.once("winnerPicked", async () => {
>                   //           console.log("winner picked event fired")
>                   //           try {
>                   //               const recentWinner = await raffle.getRecentWinner()
>                   //               const raffleState = await raffle.getRaffleState()
>                   //               const numPlayers = await raffle.getNumberOfPlayers()
>                   //               const endingTimeStamp = await raffle.getLatestTimeStamp()
>                   //               let index
>                   //               for (let i = 0; i < 3; i++) {
>                   //                   if (accountsArray[i] == recentWinner.toString()) {
>                   //                       winnerAddress = accountsArray[i]
>                   //                       index = i
>                   //                   }
>                   //               }
>                   //               //getting starting balance from map
>                   //               const winnerStartingBalance = balanceMap.get(winnerAddress)
>                   //               //getting ending balance index+1 because our array starts from zero
>                   //               const winnerEndingBalance = await accounts[index + 1].getBalance()
> 
>                   //               assert.equal(
>                   //                   winnerEndingBalance.toString(),
>                   //                   winnerStartingBalance
>                   //                       .add(raffleEntranceFee)
>                   //                       .mul(additionalEntrants)
>                   //                       .toString()
>                   //               )
>                   //               assert.equal(numPlayers.toString(), "0")
>                   //               assert.equal(raffleState.toString(), "0")
>                   //               assert.equal(endingTimeStamp > startingTimeStamp)
>                   //           } catch (e) {
>                   //               reject(e)
>                   //           }
>                   //           resolve()
>                   //       })
>                   //   })
>                   const tx = await raffle.performUpkeep([])
>                   const txReceipt = await tx.wait(1)
> 
>                   console.log(txReceipt.events[1].args.requestId)
>                   await vrfCoordinatorV2Mock.fulfillRandomWords(
>                       txReceipt.events[1].args.requestId,
>                       raffle.address
>                   )
>               })

Error is this

Error: VM Exception while processing transaction: reverted with custom error 'InsufficientBalance()'
at VRFCoordinatorV2Mock.fulfillRandomWords (@chainlink/contracts/src/v0.8/mocks/VRFCoordinatorV2Mock.sol:82)
at HardhatNode._mineBlockWithPendingTxs (node_modules\hardhat\src\internal\hardhat-network\provider\node.ts:1773:23)
at HardhatNode.mineBlock (node_modules\hardhat\src\internal\hardhat-network\provider\node.ts:466:16)
at EthModule._sendTransactionAndReturnHash (node_modules\hardhat\src\internal\hardhat-network\provider\modules\eth.ts:1504:18)
at HardhatNetworkProvider.request (node_modules\hardhat\src\internal\hardhat-network\provider\provider.ts:118:18)
at EthersProviderWrapper.send (node_modules@nomiclabs\hardhat-ethers\src\internal\ethers-provider-wrapper.ts:13:20)

[Tosinkoa]

You're not doing something right in your deployment script

[snagiqb]

Tosinkoa thanks for answering.
you can see my deployment script

const { developmentChains } = require("./../helper-hardhat-config")
const { network, ethers } = require("hardhat")

const BASE_FEE = "250000000000000000" //0.25 is premium it const 0.25 link
const GAS_PRICE_LINK = 1e9 //calculated value base on the gas price of the link

module.exports = async function ({ getNamedAccounts, deployments }) {
    const { deploy, log } = deployments
    const { deployer } = await getNamedAccounts()
    const chainId = network.config.chainId

    const args = [BASE_FEE, GAS_PRICE_LINK]

    if (developmentChains.includes(network.name)) {
        log("local network detected! Deploying mocks........")
        // deploy a mock vrfcoordinator...
        await deploy("VRFCoordinatorV2Mock", {
            from: deployer,
            args: args,
            log: true,
        })
        log("Mocks deployed")
        log("-----------------------------------------")
    }
}

module.exports.tags = ["all", "mocks"]

[PCWCFA]

The deploy script is not correct. Besides deploying the mock, there also should be some code to fund the VRFCoordinatorV2Mock. Otherwise, the mock would still fail.

const VRF_SUB_FUND_AMOUNT = ethers.utils.parseEther("2");
...
...

 if (developmentChains.includes(network.name)) {
    const VRFCoordinatorV2Mock = await ethers.getContract(
      "VRFCoordinatorV2Mock"
    );
    VRFCoordinatorV2Address = VRFCoordinatorV2Mock.address;
    const transactionResponse = await VRFCoordinatorV2Mock.createSubscription();
    const transactionReceipt = await transactionResponse.wait(1);
    subscriptionId = transactionReceipt.events[0].args.subId;
    await VRFCoordinatorV2Mock.fundSubscription(
      subscriptionId,
      VRF_SUB_FUND_AMOUNT
    );
  } else {
    VRFCoordinatorV2Address = networkConfig[chainId].VRFCoordinatorV2;
    subscriptionId = networkConfig[chainId]["subscriptionId"];
  }
  log("-------------------");

[DEFIdaniel1]

Had the same issue. @PCWFCA's answer worked for me. Needed to fund the subscription in the deploy script for the mocks. You have link in your testnet environment, but not on hardhat.

[VeerniVishwanath]

Thanks @PCWFCA your answer helped me. In my case i did const VRF_SUB_FUND_AMOUNT = 30 instead of const VRF_SUB_FUND_AMOUNT = ethers.utils.parseEther("2")

[PatrickAlphaC]

With InsufficientBalance this usually means you didn't fund the subscription... Did you add that?

[snagiqb]

[snagiqb]

Patrick thanks for answering. you can see in screenshot 20 links in my subscription so no problem in subscription. i am running it on local hardhat network why i need subscription i am using mock.

[snagiqb]

you said in video if you are running on local hardhat than contract has not any connection with outside world so according to this statement i don't think chainlink subscription needed

[snagiqb]

and how do chainlink knows about consumer i mean if contract deployed on local hardhat

[Hassan-jr]

This error looks to be in your Raffle.enterRaffle( ) function and I had the same error but I resolved it this way:
before fixing.....
await expect (await raffle.enterRaffle({value: raffleValue })).to.be.revertedWith('Raffle__RaffleNotOpen()')
after fixing ....
await expect (raffle.enterRaffle({value: raffleValue })).to.be.revertedWith('Raffle__RaffleNotOpen()')

I just removed the await keyword in the expect ( ) and it worked for me

[Tosinkoa]

Yes, I did that too

[Hassan-jr]

If that didn't solve it still
Try this ......
..... to.be.revertedWith('Raffle__RaffleNotOpen( )')

Instead of ....
to.be.revertedWith('Raffle__RaffleNotOpen')

Try adding the brackets to the custom error