Lesson 9: TypeError: interval.toNumber is not a function - when run unit test

[Longhoangger]

I'm follow the course at 15:35:19 and I'm running Raffle.test.js in unit test and I run into this error. I tried Number(), toString(), BigInt() and all of them didn't work. I don't know if it's a hardhat error or an error in my code, so I also added here my hardhat.config.js. Please help, thank you!

// my code here
  const { assert, expect } = require("chai")
  const { network, getNamedAccounts, ethers, deployments } = require("hardhat")
  const { developmentChains, networkConfig } = require("../../helper-hardhat-config")
  const { toNumber } = require("ethers")
  
  !developmentChains.includes(network.name)
      ? describe.skip
      : describe("Raffle unit test", () => {
            let raffle,
                raffleEntranceFee,
                interval,
                deployer
            const chainId = network.config.chainId
  
            beforeEach(async () => {
                deployer = (await getNamedAccounts()).deployer
                await deployments.fixture(["all"])
                raffle = await ethers.getContract("Raffle", deployer)
                vrfCoordinatorV2Mock = await ethers.getContract("VRFCoordinatorV2Mock", deployer)
                raffleEntranceFee = await raffle.getEntranceFee()
                interval = await raffle.getInterval()
            })
  
            describe("constructor", () => {
                it("initializes the raffle correctly", async () => {
                    const raffleState = await raffle.getRaffleState()
                    assert.equal(raffleState.toString(), "0")
                    assert.equal(interval.toString(), networkConfig[chainId]["interval"])
                })
            })
  
            describe("enterRaffle", () => {
                
                it("doesn't allow entrance when raffle is calculating", async () => {
                    await raffle.enterRaffle({ value: raffleEntranceFee })
  
           // I run into the error at this line
                    await network.provider.send("evm_increaseTime", [interval.toNumber() + 1])
                    await network.provider.request({ method: "evm_mine", params: [] })
                    await raffle.performUpkeep([])
                    await expect(raffle.enterRaffle({ value: raffleEntranceFee })).to.be.rejectedWith(
                        "Raffle__NotOpen",
                    )
                })
            })
        })
  

The error showing:

  1) Raffle unit test
       enterRaffle
         doesn't allow entrance when raffle is calculating:
     TypeError: interval.toNumber is not a function
      at Context.<anonymous> (test/unit/Raffle.test.js:35:77)
      at processTicksAndRejections (node:internal/process/task_queues:95:5)

This is my hardhat.config.js file

require("@nomicfoundation/hardhat-chai-matchers")
require("@nomiclabs/hardhat-etherscan")
require("@nomiclabs/hardhat-ethers")
require("hardhat-deploy")
require("solidity-coverage")
require("hardhat-gas-reporter")
require("hardhat-contract-sizer")
require("dotenv").config()

/** @type import('hardhat/config').HardhatUserConfig */

const FUJI_RPC_URL = process.env.FUJI_RPC_URL
const PRIVATE_KEY = process.env.PRIVATE_KEY
const FUJI_API_KEY = process.env.FUJI_API_KEY
const COIN_MARKET_CAP_API_KEY = process.env.COIN_MARKET_CAP_API_KEY
module.exports = {
    solidity: "0.8.19",
    defaultNetwork: "hardhat",
    networks: {
        hardhat: {
            chainId: 31337,
            blockConfirmations: 1,
        },
        avalanche: {
            chainId: 43113,
            blockConfirmations: 6,
            url: FUJI_RPC_URL,
            accounts: [PRIVATE_KEY],
        },
    },
    gasReporter: {
        enabled: false,
        currency: "USD",
        outputFile: "gas-report.txt",
        noColors: true,
        coinmarketcap: COIN_MARKET_CAP_API_KEY,
    },
    namedAccounts: {
        deployer: {
            default: 0,
        },
        player: {
            default: 1,
        },
    },
}

[alfaqi]

check the value of interval by

console.log(interval);

maybe it's undefined or null

[v4ss]

Hi @Longhoangger
In the news versions, you have to change this line

await network.provider.send("evm_increaseTime", [interval.toNumber() + 1])

By this :

await network.provider.send("evm_increaseTime", [Number(interval) + 1])

Another issue :
For the reverted error tests, use .revertedWithCustomError(raffle, "Raffle__NotOpen") instead of .rejectedWith("Raffle__NotOpen")

[mscurtescu]

I also run into both of these two issues

@v4ss do you know where was toNumnber() coming from and what library's new version forced the change to Number(...)? Just curious

[HexiangLiu]

The programing language you using in the test is javascript. In javascript, there is no toNumber method on the Number object, you can check MDN for more details. Try using Number(interval) or +interval.

[mscurtescu]

I see, thanks. I was also curious where was toNumber() coming from in the earlier versions.

It looks like ethers v5 provided BigNumber as an alternative to Javascipt's BigInt:
https://docs.ethers.org/v5/api/utils/bignumber/

But no BigNumber in v6 anymore:
https://docs.ethers.org/v6/api/utils/