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Merge pull request #733 from bgd-labs/fix/730-precision-liquidity-index
Fixes #730. accruedToTreasury not being properly considered together with aToken supply
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| import {expect} from 'chai'; | ||
| import {BigNumber, ethers} from 'ethers'; | ||
| import {MAX_UINT_AMOUNT} from '../helpers/constants'; | ||
| import {makeSuite, TestEnv} from './helpers/make-suite'; | ||
| import {HardhatRuntimeEnvironment} from 'hardhat/types'; | ||
| import { | ||
| evmSnapshot, | ||
| evmRevert, | ||
| MockFlashLoanReceiver, | ||
| getMockFlashLoanReceiver, | ||
| } from '@aave/deploy-v3'; | ||
| import './helpers/utils/wadraymath'; | ||
|
|
||
| declare var hre: HardhatRuntimeEnvironment; | ||
|
|
||
| makeSuite('Pool: liquidity indexes misc tests', (testEnv: TestEnv) => { | ||
| const TOTAL_PREMIUM = 9; | ||
| const PREMIUM_TO_PROTOCOL = 3000; | ||
|
|
||
| let _mockFlashLoanReceiver = {} as MockFlashLoanReceiver; | ||
|
|
||
| let snap: string; | ||
|
|
||
| const setupForFlashloan = async (testEnv: TestEnv) => { | ||
| const { | ||
| configurator, | ||
| pool, | ||
| weth, | ||
| aave, | ||
| dai, | ||
| users: [user0], | ||
| } = testEnv; | ||
|
|
||
| _mockFlashLoanReceiver = await getMockFlashLoanReceiver(); | ||
|
|
||
| await configurator.updateFlashloanPremiumTotal(TOTAL_PREMIUM); | ||
| await configurator.updateFlashloanPremiumToProtocol(PREMIUM_TO_PROTOCOL); | ||
|
|
||
| const userAddress = user0.address; | ||
| const amountToDeposit = ethers.utils.parseEther('1'); | ||
|
|
||
| await weth['mint(uint256)'](amountToDeposit); | ||
|
|
||
| await weth.approve(pool.address, MAX_UINT_AMOUNT); | ||
|
|
||
| await pool.deposit(weth.address, amountToDeposit, userAddress, '0'); | ||
|
|
||
| await aave['mint(uint256)'](amountToDeposit); | ||
|
|
||
| await aave.approve(pool.address, MAX_UINT_AMOUNT); | ||
|
|
||
| await pool.deposit(aave.address, amountToDeposit, userAddress, '0'); | ||
| await dai['mint(uint256)'](amountToDeposit); | ||
|
|
||
| await dai.approve(pool.address, MAX_UINT_AMOUNT); | ||
|
|
||
| await pool.deposit(dai.address, amountToDeposit, userAddress, '0'); | ||
| }; | ||
|
|
||
| before(async () => { | ||
| await setupForFlashloan(testEnv); | ||
| }); | ||
|
|
||
| beforeEach(async () => { | ||
| snap = await evmSnapshot(); | ||
| }); | ||
|
|
||
| afterEach(async () => { | ||
| await evmRevert(snap); | ||
| }); | ||
|
|
||
| it('Validates that the flash loan fee properly takes into account both aToken supply and accruedToTreasury', async () => { | ||
| const { | ||
| pool, | ||
| helpersContract, | ||
| weth, | ||
| aWETH, | ||
| users: [depositorWeth], | ||
| } = testEnv; | ||
|
|
||
| /** | ||
| * 1. Flashes 0.8 WETH | ||
| * 2. Flashes again 0.8 ETH (to have accruedToTreasury) | ||
| * 3. Validates that liquidity index took into account both aToken supply and accruedToTreasury | ||
| */ | ||
|
|
||
| const wethFlashBorrowedAmount = ethers.utils.parseEther('0.8'); | ||
|
|
||
| await pool.flashLoan( | ||
| _mockFlashLoanReceiver.address, | ||
| [weth.address], | ||
| [wethFlashBorrowedAmount], | ||
| [0], | ||
| _mockFlashLoanReceiver.address, | ||
| '0x10', | ||
| '0' | ||
| ); | ||
|
|
||
| await pool.flashLoan( | ||
| _mockFlashLoanReceiver.address, | ||
| [weth.address], | ||
| [wethFlashBorrowedAmount], | ||
| [0], | ||
| _mockFlashLoanReceiver.address, | ||
| '0x10', | ||
| '0' | ||
| ); | ||
|
|
||
| const wethReserveDataAfterSecondFlash = await helpersContract.getReserveData(weth.address); | ||
|
|
||
| const totalScaledWithTreasuryAfterSecondFlash = ( | ||
| await aWETH.scaledBalanceOf(depositorWeth.address) | ||
| ).add(wethReserveDataAfterSecondFlash.accruedToTreasuryScaled.toString()); | ||
|
|
||
| expect(await weth.balanceOf(aWETH.address)).to.be.closeTo( | ||
| BigNumber.from(totalScaledWithTreasuryAfterSecondFlash.toString()).rayMul( | ||
| wethReserveDataAfterSecondFlash.liquidityIndex | ||
| ), | ||
| 1, | ||
| 'Scaled total supply not (+/- 1) equal to WETH balance of aWETH' | ||
| ); | ||
| }); | ||
| }); |
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