Lesson 9: raffle.once not listening to the WinnerPicked event

[satishnvrn]

I'm using ethers v6 in my project and wanted to listen to WinnerPicked event on my raffle contract. I'm able to check the logs and I can see that the event is emitted but raffle.once in my repository is not able to listen to it. Here is a link to my repository.

Thsi is the error I'm facing:

Raffle Unit Tests
    fullfillRandomWords
raffle performupkeep transaction mined
requestId 1n
fulfillParsedLogs 2 [
  LogDescription {
    fragment: EventFragment {
      type: 'event',
      inputs: [Array],
      name: 'WinnerPicked',
      anonymous: false
    },
    name: 'WinnerPicked',
    signature: 'WinnerPicked(address)',
    topic: '0x5b690ec4a06fe979403046eaeea5b3ce38524683c3001f662c8b5a829632f7df',
    args: Result(1) [ '0x70997970C51812dc3A010C7d01b50e0d17dc79C8' ]
  },
  null
]

      1) picks a winner, resets the lottery, and sends money


  0 passing (21s)
  1 failing

  1) Raffle Unit Tests
       fullfillRandomWords
         picks a winner, resets the lottery, and sends money:
     Error: Timeout of 20000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/satishnvrn/Documents/Projects/hh-sat/hardhat-lottery-smartcontract-sat/test/unit/Raffle.test.ts)
      at listOnTimeout (node:internal/timers:569:17)
      at processTimers (node:internal/timers:512:7)

Note: I want to fix this with ethers V6 only and please don't suggest downgrading ethers.

[Gandouye]

Error: Timeout of 400000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves.
It took me some time but I went step by step to fix it.
Finally, I saw it was an issue with the latest version of hardhat, ethers…
I am using the latest versions… "ethers": "^6.10.0», «hardhat": "^2.19.4", solidity ^0.8.19
The whole solution could be found at my repo: My Repo or directly at the raffle.staging.test.js @raffle.staging.test.js
Mainly changes in the latest versions… please note the main changes:

const raffleAddress = (await deployments.get("Raffle")).address
raffle = await ethers.getContractAt("Raffle", raffleAddress) //instead of getContract

setTimeout(resolve, 5000)                      
raffle.on("WinnerPicked", async () => { // instead of raffle.once

Hope this will help.