diff --git a/contracts/src/v0.8/automation/upkeeps/UpkeepBalanceMonitor.sol b/contracts/src/v0.8/automation/upkeeps/UpkeepBalanceMonitor.sol new file mode 100644 index 00000000000..dae17da7293 --- /dev/null +++ b/contracts/src/v0.8/automation/upkeeps/UpkeepBalanceMonitor.sol @@ -0,0 +1,258 @@ +// SPDX-License-Identifier: MIT + +pragma solidity 0.8.19; + +import {ConfirmedOwner} from "../../shared/access/ConfirmedOwner.sol"; +import {IAutomationRegistryConsumer} from "../interfaces/IAutomationRegistryConsumer.sol"; +import {LinkTokenInterface} from "../../shared/interfaces/LinkTokenInterface.sol"; +import {Pausable} from "@openzeppelin/contracts/security/Pausable.sol"; +import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol"; + +/// @title The UpkeepBalanceMonitor contract +/// @notice A keeper-compatible contract that monitors and funds Chainlink Automation upkeeps. +contract UpkeepBalanceMonitor is ConfirmedOwner, Pausable { + using EnumerableSet for EnumerableSet.AddressSet; + + event ConfigSet(Config config); + event ForwarderSet(address forwarderAddress); + event FundsWithdrawn(uint256 amountWithdrawn, address payee); + event TopUpFailed(uint256 indexed upkeepId); + event TopUpSucceeded(uint256 indexed upkeepId, uint96 amount); + event WatchListSet(address registryAddress); + + error InvalidConfig(); + error InvalidTopUpData(); + error OnlyForwarderOrOwner(); + + /// @member maxBatchSize is the maximum number of upkeeps to fund in a single transaction + /// @member minPercentage is the percentage of the upkeep's minBalance at which top-up occurs + /// @member targetPercentage is the percentage of the upkeep's minBalance to top-up to + /// @member maxTopUpAmount is the maximum amount of LINK to top-up an upkeep with + struct Config { + uint8 maxBatchSize; + uint24 minPercentage; + uint24 targetPercentage; + uint96 maxTopUpAmount; + } + + // ================================================================ + // | STORAGE | + // ================================================================ + + LinkTokenInterface private immutable LINK_TOKEN; + + mapping(address => uint256[]) s_registryWatchLists; + EnumerableSet.AddressSet s_registries; + Config private s_config; + address private s_forwarderAddress; + + // ================================================================ + // | CONSTRUCTOR | + // ================================================================ + + /// @param linkToken the Link token address + /// @param config the initial config for the contract + constructor(LinkTokenInterface linkToken, Config memory config) ConfirmedOwner(msg.sender) { + require(address(linkToken) != address(0)); + LINK_TOKEN = linkToken; + setConfig(config); + } + + // ================================================================ + // | CORE FUNCTIONALITY | + // ================================================================ + + /// @notice Gets a list of upkeeps that are underfunded + /// @return needsFunding list of underfunded upkeepIDs + /// @return registryAddresses list of registries that the upkeepIDs belong to + /// @return topUpAmounts amount to top up each upkeep + function getUnderfundedUpkeeps() public view returns (uint256[] memory, address[] memory, uint96[] memory) { + Config memory config = s_config; + uint256[] memory needsFunding = new uint256[](config.maxBatchSize); + address[] memory registryAddresses = new address[](config.maxBatchSize); + uint96[] memory topUpAmounts = new uint96[](config.maxBatchSize); + uint256 availableFunds = LINK_TOKEN.balanceOf(address(this)); + uint256 count; + for (uint256 i = 0; i < s_registries.length(); i++) { + IAutomationRegistryConsumer registry = IAutomationRegistryConsumer(s_registries.at(i)); + for (uint256 j = 0; j < s_registryWatchLists[address(registry)].length; j++) { + uint256 upkeepID = s_registryWatchLists[address(registry)][j]; + uint96 upkeepBalance = registry.getBalance(upkeepID); + uint96 minBalance = registry.getMinBalance(upkeepID); + uint96 topUpThreshold = (minBalance * config.minPercentage) / 100; + uint96 topUpAmount = ((minBalance * config.targetPercentage) / 100) - upkeepBalance; + if (topUpAmount > config.maxTopUpAmount) { + topUpAmount = config.maxTopUpAmount; + } + if (upkeepBalance <= topUpThreshold && availableFunds >= topUpAmount) { + needsFunding[count] = upkeepID; + topUpAmounts[count] = topUpAmount; + registryAddresses[count] = address(registry); + count++; + availableFunds -= topUpAmount; + } + if (count == config.maxBatchSize) { + break; + } + } + if (count == config.maxBatchSize) { + break; + } + } + if (count < config.maxBatchSize) { + assembly { + mstore(needsFunding, count) + mstore(registryAddresses, count) + mstore(topUpAmounts, count) + } + } + return (needsFunding, registryAddresses, topUpAmounts); + } + + /// @notice Called by the keeper/owner to send funds to underfunded upkeeps + /// @param upkeepIDs the list of upkeep ids to fund + /// @param registryAddresses the list of registries that the upkeepIDs belong to + /// @param topUpAmounts the list of amounts to fund each upkeep with + /// @dev We explicitly choose not to verify that input upkeepIDs are included in the watchlist. We also + /// explicity permit any amount to be sent via topUpAmounts; it does not have to meet the criteria + /// specified in getUnderfundedUpkeeps(). Here, we are relying on the security of automation's OCR to + /// secure the output of getUnderfundedUpkeeps() as the input to topUp(), and we are treating the owner + /// as a privileged user that can perform arbitrary top-ups to any upkeepID. + function topUp( + uint256[] memory upkeepIDs, + address[] memory registryAddresses, + uint96[] memory topUpAmounts + ) public whenNotPaused { + if (msg.sender != address(s_forwarderAddress) && msg.sender != owner()) revert OnlyForwarderOrOwner(); + if (upkeepIDs.length != registryAddresses.length || upkeepIDs.length != topUpAmounts.length) + revert InvalidTopUpData(); + for (uint256 i = 0; i < upkeepIDs.length; i++) { + try LINK_TOKEN.transferAndCall(registryAddresses[i], topUpAmounts[i], abi.encode(upkeepIDs[i])) returns ( + bool success + ) { + if (success) { + emit TopUpSucceeded(upkeepIDs[i], topUpAmounts[i]); + continue; + } + } catch {} + emit TopUpFailed(upkeepIDs[i]); + } + } + + // ================================================================ + // | AUTOMATION COMPATIBLE | + // ================================================================ + + /// @notice Gets list of upkeeps ids that are underfunded and returns a keeper-compatible payload. + /// @return upkeepNeeded signals if upkeep is needed, performData is an abi encoded list of subscription ids that need funds + function checkUpkeep(bytes calldata) external view returns (bool upkeepNeeded, bytes memory performData) { + ( + uint256[] memory needsFunding, + address[] memory registryAddresses, + uint96[] memory topUpAmounts + ) = getUnderfundedUpkeeps(); + upkeepNeeded = needsFunding.length > 0; + if (upkeepNeeded) { + performData = abi.encode(needsFunding, registryAddresses, topUpAmounts); + } + return (upkeepNeeded, performData); + } + + /// @notice Called by the keeper to send funds to underfunded addresses. + /// @param performData the abi encoded list of addresses to fund + function performUpkeep(bytes calldata performData) external { + (uint256[] memory upkeepIDs, address[] memory registryAddresses, uint96[] memory topUpAmounts) = abi.decode( + performData, + (uint256[], address[], uint96[]) + ); + topUp(upkeepIDs, registryAddresses, topUpAmounts); + } + + // ================================================================ + // | ADMIN | + // ================================================================ + + /// @notice Withdraws the contract balance in LINK. + /// @param amount the amount of LINK (in juels) to withdraw + /// @param payee the address to pay + function withdraw(uint256 amount, address payee) external onlyOwner { + require(payee != address(0)); + LINK_TOKEN.transfer(payee, amount); + emit FundsWithdrawn(amount, payee); + } + + /// @notice Pause the contract, which prevents executing performUpkeep. + function pause() external onlyOwner { + _pause(); + } + + /// @notice Unpause the contract. + function unpause() external onlyOwner { + _unpause(); + } + + // ================================================================ + // | SETTERS | + // ================================================================ + + /// @notice Sets the list of upkeeps to watch + /// @param registryAddress the registry that this watchlist applies to + /// @param watchlist the list of UpkeepIDs to watch + function setWatchList(address registryAddress, uint256[] calldata watchlist) external onlyOwner { + if (watchlist.length == 0) { + s_registries.remove(registryAddress); + delete s_registryWatchLists[registryAddress]; + } else { + s_registries.add(registryAddress); + s_registryWatchLists[registryAddress] = watchlist; + } + emit WatchListSet(registryAddress); + } + + /// @notice Sets the contract config + /// @param config the new config + function setConfig(Config memory config) public onlyOwner { + if ( + config.maxBatchSize == 0 || + config.minPercentage < 100 || + config.targetPercentage <= config.minPercentage || + config.maxTopUpAmount == 0 + ) { + revert InvalidConfig(); + } + s_config = config; + emit ConfigSet(config); + } + + /// @notice Sets the upkeep's forwarder contract + /// @param forwarderAddress the new forwarder + /// @dev this should only need to be called once, after registering the contract with the registry + function setForwarder(address forwarderAddress) external onlyOwner { + s_forwarderAddress = forwarderAddress; + emit ForwarderSet(forwarderAddress); + } + + // ================================================================ + // | GETTERS | + // ================================================================ + + /// @notice Gets the list of upkeeps ids being monitored + function getWatchList() external view returns (address[] memory, uint256[][] memory) { + address[] memory registryAddresses = s_registries.values(); + uint256[][] memory upkeepIDs = new uint256[][](registryAddresses.length); + for (uint256 i = 0; i < registryAddresses.length; i++) { + upkeepIDs[i] = s_registryWatchLists[registryAddresses[i]]; + } + return (registryAddresses, upkeepIDs); + } + + /// @notice Gets the contract config + function getConfig() external view returns (Config memory) { + return s_config; + } + + /// @notice Gets the upkeep's forwarder contract + function getForwarder() external view returns (address) { + return s_forwarderAddress; + } +} diff --git a/contracts/test/v0.8/automation/UpkeepBalanceMonitor.test.ts b/contracts/test/v0.8/automation/UpkeepBalanceMonitor.test.ts new file mode 100644 index 00000000000..259a9c3b9f8 --- /dev/null +++ b/contracts/test/v0.8/automation/UpkeepBalanceMonitor.test.ts @@ -0,0 +1,399 @@ +import { ethers } from 'hardhat' +import { expect } from 'chai' +import type { SignerWithAddress } from '@nomiclabs/hardhat-ethers/signers' +import { randomAddress } from '../../test-helpers/helpers' +import { loadFixture } from '@nomicfoundation/hardhat-network-helpers' +import { IKeeperRegistryMaster__factory as RegistryFactory } from '../../../typechain/factories/IKeeperRegistryMaster__factory' +import { IAutomationForwarder__factory as ForwarderFactory } from '../../../typechain/factories/IAutomationForwarder__factory' +import { UpkeepBalanceMonitor } from '../../../typechain/UpkeepBalanceMonitor' +import { LinkToken } from '../../../typechain/LinkToken' +import { BigNumber } from 'ethers' +import { + deployMockContract, + MockContract, +} from '@ethereum-waffle/mock-contract' + +let owner: SignerWithAddress +let stranger: SignerWithAddress +let registry: MockContract +let registry2: MockContract +let forwarder: MockContract +let linkToken: LinkToken +let upkeepBalanceMonitor: UpkeepBalanceMonitor + +const setup = async () => { + const accounts = await ethers.getSigners() + owner = accounts[0] + stranger = accounts[1] + + const ltFactory = await ethers.getContractFactory( + 'src/v0.4/LinkToken.sol:LinkToken', + owner, + ) + linkToken = (await ltFactory.deploy()) as LinkToken + const bmFactory = await ethers.getContractFactory( + 'UpkeepBalanceMonitor', + owner, + ) + upkeepBalanceMonitor = await bmFactory.deploy(linkToken.address, { + maxBatchSize: 10, + minPercentage: 120, + targetPercentage: 300, + maxTopUpAmount: ethers.utils.parseEther('100'), + }) + registry = await deployMockContract(owner, RegistryFactory.abi) + registry2 = await deployMockContract(owner, RegistryFactory.abi) + forwarder = await deployMockContract(owner, ForwarderFactory.abi) + await forwarder.mock.getRegistry.returns(registry.address) + await upkeepBalanceMonitor.setForwarder(forwarder.address) + await linkToken + .connect(owner) + .transfer(upkeepBalanceMonitor.address, ethers.utils.parseEther('10000')) + await upkeepBalanceMonitor + .connect(owner) + .setWatchList(registry.address, [0, 1, 2, 3, 4, 5, 6, 7, 8]) + await upkeepBalanceMonitor + .connect(owner) + .setWatchList(registry2.address, [9, 10, 11]) + for (let i = 0; i < 9; i++) { + await registry.mock.getMinBalance.withArgs(i).returns(100) + await registry.mock.getBalance.withArgs(i).returns(121) // all upkeeps are sufficiently funded + } + for (let i = 9; i < 12; i++) { + await registry2.mock.getMinBalance.withArgs(i).returns(100) + await registry2.mock.getBalance.withArgs(i).returns(121) // all upkeeps are sufficiently funded + } +} + +describe('UpkeepBalanceMonitor', () => { + beforeEach(async () => { + await loadFixture(setup) + }) + + describe('constructor()', () => { + it('should set the initial values correctly', async () => { + const config = await upkeepBalanceMonitor.getConfig() + expect(config.maxBatchSize).to.equal(10) + expect(config.minPercentage).to.equal(120) + expect(config.targetPercentage).to.equal(300) + expect(config.maxTopUpAmount).to.equal(ethers.utils.parseEther('100')) + }) + }) + + describe('setConfig()', () => { + const newConfig = { + maxBatchSize: 100, + minPercentage: 150, + targetPercentage: 500, + maxTopUpAmount: 1, + } + + it('should set config correctly', async () => { + await upkeepBalanceMonitor.connect(owner).setConfig(newConfig) + const config = await upkeepBalanceMonitor.getConfig() + expect(config.maxBatchSize).to.equal(newConfig.maxBatchSize) + expect(config.minPercentage).to.equal(newConfig.minPercentage) + expect(config.targetPercentage).to.equal(newConfig.targetPercentage) + expect(config.maxTopUpAmount).to.equal(newConfig.maxTopUpAmount) + }) + + it('cannot be called by a non-owner', async () => { + await expect( + upkeepBalanceMonitor.connect(stranger).setConfig(newConfig), + ).to.be.revertedWith('Only callable by owner') + }) + + it('should emit an event', async () => { + await expect( + upkeepBalanceMonitor.connect(owner).setConfig(newConfig), + ).to.emit(upkeepBalanceMonitor, 'ConfigSet') + }) + }) + + describe('setForwarder()', () => { + const newForwarder = randomAddress() + + it('should set the forwarder correctly', async () => { + await upkeepBalanceMonitor.connect(owner).setForwarder(newForwarder) + const forwarderAddress = await upkeepBalanceMonitor.getForwarder() + expect(forwarderAddress).to.equal(newForwarder) + }) + + it('cannot be called by a non-owner', async () => { + await expect( + upkeepBalanceMonitor.connect(stranger).setForwarder(randomAddress()), + ).to.be.revertedWith('Only callable by owner') + }) + + it('should emit an event', async () => { + await expect( + upkeepBalanceMonitor.connect(owner).setForwarder(newForwarder), + ) + .to.emit(upkeepBalanceMonitor, 'ForwarderSet') + .withArgs(newForwarder) + }) + }) + + describe('setWatchList()', () => { + const newWatchList = [ + BigNumber.from(1), + BigNumber.from(2), + BigNumber.from(10), + ] + + it('should add addresses to the watchlist', async () => { + await upkeepBalanceMonitor + .connect(owner) + .setWatchList(registry.address, newWatchList) + const [_, upkeepIDs] = await upkeepBalanceMonitor.getWatchList() + expect(upkeepIDs[0]).to.deep.equal(newWatchList) + }) + + it('cannot be called by a non-owner', async () => { + await expect( + upkeepBalanceMonitor + .connect(stranger) + .setWatchList(registry.address, [1, 2, 3]), + ).to.be.revertedWith('Only callable by owner') + }) + + it('should emit an event', async () => { + await expect( + upkeepBalanceMonitor + .connect(owner) + .setWatchList(registry.address, newWatchList), + ) + .to.emit(upkeepBalanceMonitor, 'WatchListSet') + .withArgs(registry.address) + }) + }) + + describe('withdraw()', () => { + const payee = randomAddress() + const withdrawAmount = 100 + + it('should withdraw funds to a payee', async () => { + const initialBalance = await linkToken.balanceOf( + upkeepBalanceMonitor.address, + ) + await upkeepBalanceMonitor.connect(owner).withdraw(withdrawAmount, payee) + const finalBalance = await linkToken.balanceOf( + upkeepBalanceMonitor.address, + ) + const payeeBalance = await linkToken.balanceOf(payee) + expect(finalBalance).to.equal(initialBalance.sub(withdrawAmount)) + expect(payeeBalance).to.equal(withdrawAmount) + }) + + it('cannot be called by a non-owner', async () => { + await expect( + upkeepBalanceMonitor.connect(stranger).withdraw(withdrawAmount, payee), + ).to.be.revertedWith('Only callable by owner') + }) + + it('should emit an event', async () => { + await expect( + upkeepBalanceMonitor.connect(owner).withdraw(withdrawAmount, payee), + ) + .to.emit(upkeepBalanceMonitor, 'FundsWithdrawn') + .withArgs(100, payee) + }) + }) + + describe('pause() and unpause()', () => { + it('should pause and unpause the contract', async () => { + await upkeepBalanceMonitor.connect(owner).pause() + expect(await upkeepBalanceMonitor.paused()).to.be.true + await upkeepBalanceMonitor.connect(owner).unpause() + expect(await upkeepBalanceMonitor.paused()).to.be.false + }) + + it('cannot be called by a non-owner', async () => { + await expect( + upkeepBalanceMonitor.connect(stranger).pause(), + ).to.be.revertedWith('Only callable by owner') + await upkeepBalanceMonitor.connect(owner).pause() + await expect( + upkeepBalanceMonitor.connect(stranger).unpause(), + ).to.be.revertedWith('Only callable by owner') + }) + }) + + describe('checkUpkeep() / getUnderfundedUpkeeps()', () => { + it('should find the underfunded upkeeps', async () => { + let [upkeepIDs, registries, topUpAmounts] = + await upkeepBalanceMonitor.getUnderfundedUpkeeps() + expect(upkeepIDs.length).to.equal(0) + expect(registries.length).to.equal(0) + expect(topUpAmounts.length).to.equal(0) + let [upkeepNeeded, performData] = + await upkeepBalanceMonitor.checkUpkeep('0x') + expect(upkeepNeeded).to.be.false + expect(performData).to.equal('0x') + // update the balance for some upkeeps + await registry.mock.getBalance.withArgs(2).returns(120) + await registry.mock.getBalance.withArgs(4).returns(15) + await registry.mock.getBalance.withArgs(5).returns(0) + ;[upkeepIDs, registries, topUpAmounts] = + await upkeepBalanceMonitor.getUnderfundedUpkeeps() + expect(upkeepIDs.map((v) => v.toNumber())).to.deep.equal([2, 4, 5]) + expect(registries).to.deep.equal([ + registry.address, + registry.address, + registry.address, + ]) + expect(topUpAmounts.map((v) => v.toNumber())).to.deep.equal([ + 180, 285, 300, + ]) + ;[upkeepNeeded, performData] = + await upkeepBalanceMonitor.checkUpkeep('0x') + expect(upkeepNeeded).to.be.true + expect(performData).to.equal( + ethers.utils.defaultAbiCoder.encode( + ['uint256[]', 'address[]', 'uint256[]'], + [ + [2, 4, 5], + [registry.address, registry.address, registry.address], + [180, 285, 300], + ], + ), + ) + // update all to need funding + for (let i = 0; i < 9; i++) { + await registry.mock.getBalance.withArgs(i).returns(0) + } + for (let i = 9; i < 12; i++) { + await registry2.mock.getBalance.withArgs(i).returns(0) + } + // only the max batch size are included in the list + ;[upkeepIDs, registries, topUpAmounts] = + await upkeepBalanceMonitor.getUnderfundedUpkeeps() + expect(upkeepIDs.length).to.equal(10) + expect(topUpAmounts.length).to.equal(10) + expect(upkeepIDs.map((v) => v.toNumber())).to.deep.equal([ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + ]) + expect(registries).to.deep.equal([ + ...Array(9).fill(registry.address), + registry2.address, + ]) + expect(topUpAmounts.map((v) => v.toNumber())).to.deep.equal([ + ...Array(10).fill(300), + ]) + // update the balance for some upkeeps + await registry.mock.getBalance.withArgs(0).returns(300) + await registry.mock.getBalance.withArgs(5).returns(300) + ;[upkeepIDs, registries, topUpAmounts] = + await upkeepBalanceMonitor.getUnderfundedUpkeeps() + expect(upkeepIDs.length).to.equal(10) + expect(topUpAmounts.length).to.equal(10) + expect(upkeepIDs.map((v) => v.toNumber())).to.deep.equal([ + 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, + ]) + expect(registries).to.deep.equal([ + ...Array(7).fill(registry.address), + ...Array(3).fill(registry2.address), + ]) + expect(topUpAmounts.map((v) => v.toNumber())).to.deep.equal([ + ...Array(10).fill(300), + ]) + }) + }) + + describe('topUp()', () => { + beforeEach(async () => { + await registry.mock.onTokenTransfer + .withArgs( + upkeepBalanceMonitor.address, + 100, + ethers.utils.defaultAbiCoder.encode(['uint256'], [1]), + ) + .returns() + await registry.mock.onTokenTransfer + .withArgs( + upkeepBalanceMonitor.address, + 50, + ethers.utils.defaultAbiCoder.encode(['uint256'], [7]), + ) + .returns() + }) + + it('cannot be called by a non-owner', async () => { + await expect( + upkeepBalanceMonitor.connect(stranger).topUp([], [], []), + ).to.be.revertedWith('OnlyForwarderOrOwner()') + }) + + it('should revert if the contract is paused', async () => { + await upkeepBalanceMonitor.connect(owner).pause() + await expect( + upkeepBalanceMonitor.connect(owner).topUp([], [], []), + ).to.be.revertedWith('Pausable: paused') + }) + + it('tops up the upkeeps by the amounts provided', async () => { + const initialBalance = await linkToken.balanceOf(registry.address) + const tx = await upkeepBalanceMonitor + .connect(owner) + .topUp([1, 7], [registry.address, registry.address], [100, 50]) + const finalBalance = await linkToken.balanceOf(registry.address) + expect(finalBalance).to.equal(initialBalance.add(150)) + await expect(tx) + .to.emit(upkeepBalanceMonitor, 'TopUpSucceeded') + .withArgs(1, 100) + await expect(tx) + .to.emit(upkeepBalanceMonitor, 'TopUpSucceeded') + .withArgs(7, 50) + }) + + it('does not abort if one top-up fails', async () => { + const initialBalance = await linkToken.balanceOf(registry.address) + const tx = await upkeepBalanceMonitor + .connect(owner) + .topUp( + [1, 7, 100], + [registry.address, registry.address, registry.address], + [100, 50, 100], + ) + const finalBalance = await linkToken.balanceOf(registry.address) + expect(finalBalance).to.equal(initialBalance.add(150)) + await expect(tx) + .to.emit(upkeepBalanceMonitor, 'TopUpSucceeded') + .withArgs(1, 100) + await expect(tx) + .to.emit(upkeepBalanceMonitor, 'TopUpSucceeded') + .withArgs(7, 50) + await expect(tx) + .to.emit(upkeepBalanceMonitor, 'TopUpFailed') + .withArgs(100) + }) + }) + + describe('checkUpkeep() / performUpkeep()', () => { + it('works round-trip', async () => { + await registry.mock.getBalance.withArgs(1).returns(100) // needs 200 + await registry.mock.getBalance.withArgs(7).returns(0) // needs 300 + await registry.mock.onTokenTransfer + .withArgs( + upkeepBalanceMonitor.address, + 200, + ethers.utils.defaultAbiCoder.encode(['uint256'], [1]), + ) + .returns() + await registry.mock.onTokenTransfer + .withArgs( + upkeepBalanceMonitor.address, + 300, + ethers.utils.defaultAbiCoder.encode(['uint256'], [7]), + ) + .returns() + const [upkeepNeeded, performData] = + await upkeepBalanceMonitor.checkUpkeep('0x') + expect(upkeepNeeded).to.be.true + const initialBalance = await linkToken.balanceOf(registry.address) + await upkeepBalanceMonitor.connect(owner).performUpkeep(performData) + const finalBalance = await linkToken.balanceOf(registry.address) + expect(finalBalance).to.equal(initialBalance.add(500)) + }) + }) +})