Lesson 9 : TypeError: Cannot read properties of undefined (reading 'args')

[MrPositive0709]

This is my repo link : https://github.com/MrPositive0709/hardhat-smartcontract-lottery-fcc

When I use hh test to run the test , it returns me 2 failure tests with the similar reason :

`hh test

Raffle Unit Tests
constructor
✔ initializes the raffle correctly
enterRaffle
✔ reverts when you don't pay enough
✔ records players when they enter
✔ emits event on enter
✔ doesn't allow entrance when raffle is calculating (47ms)
checkUpkeep
✔ returns false if people haven't sent any ETH
✔ returns false if raffle isn't open (41ms)
performUpkeep
✔ can only run if checkupkeep is true
✔ reverts if checkup is false
1) updates the raffle state and emits a requestId
fulfillRandomWords
✔ can only be called after performupkeep
2) picks a winner, resets, and sends money

10 passing (2s)
2 failing

1. Raffle Unit Tests
   performUpkeep
   updates the raffle state and emits a requestId:
   TypeError: Cannot read properties of undefined (reading 'args')
   at Context. (test/unit/Raffle.test.js:117:49)
   at processTicksAndRejections (node:internal/process/task_queues:96:5)
   at runNextTicks (node:internal/process/task_queues:65:3)
   at listOnTimeout (node:internal/timers:528:9)
   at processTimers (node:internal/timers:502:7)

2. Raffle Unit Tests
   fulfillRandomWords
   picks a winner, resets, and sends money:
   TypeError: Cannot read properties of undefined (reading 'args')
   at /root/hh-fcc/hardhat-smartcontract-lottery-fcc/test/unit/Raffle.test.js:201:37
   at processTicksAndRejections (node:internal/process/task_queues:96:5)
   at runNextTicks (node:internal/process/task_queues:65:3)
   at listOnTimeout (node:internal/timers:528:9)
   at processTimers (node:internal/timers:502:7)`

   this is the snippet code of those 2 in my unit-test.js :
   const requestId = txReceipt.events[1].args.requestId;

[alfaqi]

Hey @MrPositive0709, you have to emit the event,
add this line into Raffle.sol file, to function performUpkeep in line 124

    emit RequestedRaffleWinner(requestId);

and change requestedId to requestId

    event RequestedRaffleWinner(uint256 indexed requestId);

and will run a new issue

  1) Raffle Unit Tests
       fulfillRandomWords
         picks a winner, resets, and sends money:
     ReferenceError: startingBalance is not defined

I don't know why, but you can move this line outside of try block

    const startingBalance = await accounts[2].getBalance();