Lesson 9: ReferenceError: startingBalance is not defined

[Melisepoon]

Hi all! below is my code, for Raffle.test.js in lesson9.
This is the same exact code as copied from the github repository.
However, I have received the error: ReferenceError: startingBalance is not defined multiple times.

Hope someone will be able to assist me to resolve this. Thanks!

                  const additionalEntrances = 3 // to test
                  const startingIndex = 2
                  for (let i = startingIndex; i < startingIndex + additionalEntrances; i++) {
                      // i = 2; i < 5; i=i+1
                      raffle = raffleContract.connect(accounts[i]) // Returns a new instance of the Raffle contract connected to player
                      await raffle.enterRaffle({ value: raffleEntranceFee })
                  }
                  const startingTimeStamp = await raffle.getLastTimeStamp() // stores starting timestamp (before we fire our event)

                  // This will be more important for our staging tests...
                  await new Promise(async (resolve, reject) => {
                      raffle.once("WinnerPicked", async () => {
                          // event listener for WinnerPicked
                          console.log("WinnerPicked event fired!")
                          // assert throws an error if it fails, so we need to wrap
                          // it in a try/catch so that the promise returns event
                          // if it fails.
                          try {
                              // Now lets get the ending values...
                              const recentWinner = await raffle.getRecentWinner()
                              const raffleState = await raffle.getRaffleState()
                              const winnerBalance = await accounts[2].getBalance()
                              const endingTimeStamp = await raffle.getLastTimeStamp()
                              await expect(raffle.getPlayer(0)).to.be.reverted
                              // Comparisons to check if our ending values are correct:
                              assert.equal(recentWinner.toString(), accounts[2].address)
                              assert.equal(raffleState, 0)
                              assert.equal(
                                  winnerBalance.toString(),
                                  startingBalance // startingBalance + ( (raffleEntranceFee * additionalEntrances) + raffleEntranceFee )
                                      .add(
                                          raffleEntranceFee
                                              .mul(additionalEntrances)
                                              .add(raffleEntranceFee),
                                      )
                                      .toString(),
                              )
                              assert(endingTimeStamp > startingTimeStamp)
                              resolve() // if try passes, resolves the promise
                          } catch (e) {
                              reject(e) // if try fails, rejects the promise
                          }
                      })

                      // kicking off the event by mocking the chainlink keepers and vrf coordinator
                      try {
                          const tx = await raffle.performUpkeep("0x")
                          const txReceipt = await tx.wait(1)
                          const startingBalance = await accounts[2].getBalance()
                          await vrfCoordinatorV2Mock.fulfillRandomWords(
                              txReceipt.events[1].args.requestId,
                              raffle.address,
                          )
                      } catch (e) {
                          reject(e)
                      }
                  })

this is the error received:

[alfaqi]

Try to take out this line const startingBalance = await accounts[2].getBalance() from try-catch block, like this

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

    try {
        const tx = await raffle.performUpkeep("0x")
        const txReceipt = await tx.wait(1)
        await vrfCoordinatorV2Mock.fulfillRandomWords(
        txReceipt.events[1].args.requestId,
        raffle.address,
        )
   }catch (e) {
       reject(e)
       }

I'm not sure if this perfect solution or not, but it will work fine.

[Melisepoon]

yep! this works fine! but another solution that i've derived would be to completely remove the try-catch block, as per Patrick's video as so:

                        const tx = await raffle.performUpkeep("0x")
                        const txReceipt = await tx.wait(1)
                        const winnerStartingBalance = await accounts[1].getBalance()
                        await vrfCoordinatorV2Mock.fulfillRandomWords(
                            txReceipt.events[1].args.requestId,
                            raffle.address,
                        )