message: maint(ct): clean up L2StdTokenFac tests
  Cleans up the L2StandardTokenFactory tests using the same technique as
  previous cleanup PRs.
diff: -/* External Imports */
  import { ethers } from 'hardhat'
  -import { Signer, ContractFactory, Contract } from 'ethers'
  +import { ContractFactory, Contract } from 'ethers'
  import {
  smock,
  MockContractFactory,
  MockContract,
  } from '@defi-wonderland/smock'
  -/* Internal Imports */
  import { expect } from '../../../setup'
  -import { predeploys, getContractInterface } from '../../../../src'
  +import { deploy } from '../../../helpers'
  +import { predeploys } from '../../../../src'
  describe('L2StandardTokenFactory', () => {
  - let signer: Signer
  let Factory__L1ERC20: MockContractFactory<ContractFactory>
  let L1ERC20: MockContract<Contract>
  let L2StandardTokenFactory: Contract
  before(async () => {
  - ;[signer] = await ethers.getSigners()
  - // deploy an ERC20 contract on L1
  - Factory__L1ERC20 = await smock.mock(
  - '@openzeppelin/contracts/token/ERC20/ERC20.sol:ERC20'
  - )
  + Factory__L1ERC20 = await smock.mock('ERC20')
  L1ERC20 = await Factory__L1ERC20.deploy('L1ERC20', 'ERC')
  -
  - L2StandardTokenFactory = await (
  - await ethers.getContractFactory('L2StandardTokenFactory')
  - ).deploy()
  + L2StandardTokenFactory = await deploy('L2StandardTokenFactory')
  })
  describe('Standard token factory', () => {
  @@ -36,18 +27,18 @@ describe('L2StandardTokenFactory', () => {
  'L2ERC20',
  'ERC'
  )
  +
  + // Pull the token creation event from the receipt
  const receipt = await tx.wait()
  - const [tokenCreatedEvent] = receipt.events
  + const tokenCreatedEvent = receipt.events[0]
  - // Expect there to be an event emmited for the standard token creation
  + // Expect there to be an event emitted for the standard token creation
  expect(tokenCreatedEvent.event).to.be.eq('StandardL2TokenCreated')
  - // Get the L2 token address from the emmited event and check it was created correctly
  - const l2TokenAddress = tokenCreatedEvent.args._l2Token
  - const l2Token = new Contract(
  - l2TokenAddress,
  - getContractInterface('L2StandardERC20'),
  - signer
  + // Get the L2 token address from the emitted event and check it was created correctly
  + const l2Token = await ethers.getContractAt(
  + 'L2StandardERC20',
  + tokenCreatedEvent.args._l2Token
  )
  expect(await l2Token.l2Bridge()).to.equal(predeploys.L2StandardBridge)
  