mirror of
https://github.com/Instadapp/aave-protocol-v2.git
synced 2024-07-29 21:47:30 +00:00
439 lines
16 KiB
TypeScript
439 lines
16 KiB
TypeScript
import BigNumber from 'bignumber.js';
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import {BRE, increaseTime} from '../helpers/misc-utils';
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import {APPROVAL_AMOUNT_LENDING_POOL, oneEther} from '../helpers/constants';
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import {convertToCurrencyDecimals} from '../helpers/contracts-helpers';
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import {makeSuite} from './helpers/make-suite';
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import {ProtocolErrors, RateMode} from '../helpers/types';
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import {calcExpectedStableDebtTokenBalance} from './helpers/utils/calculations';
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import {getUserData} from './helpers/utils/helpers';
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const chai = require('chai');
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const {expect} = chai;
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makeSuite('LendingPool liquidation - liquidator receiving the underlying asset', (testEnv) => {
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const {INVALID_HF} = ProtocolErrors;
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before('Before LendingPool liquidation: set config', () => {
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BigNumber.config({DECIMAL_PLACES: 0, ROUNDING_MODE: BigNumber.ROUND_DOWN});
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});
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after('After LendingPool liquidation: reset config', () => {
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BigNumber.config({DECIMAL_PLACES: 20, ROUNDING_MODE: BigNumber.ROUND_HALF_UP});
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});
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it('LIQUIDATION - Deposits WETH, borrows DAI', async () => {
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const {dai, weth, users, pool, oracle} = testEnv;
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const depositor = users[0];
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const borrower = users[1];
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//mints DAI to depositor
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await dai.connect(depositor.signer).mint(await convertToCurrencyDecimals(dai.address, '1000'));
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//approve protocol to access depositor wallet
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await dai.connect(depositor.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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//user 1 deposits 1000 DAI
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const amountDAItoDeposit = await convertToCurrencyDecimals(dai.address, '1000');
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await pool.connect(depositor.signer).deposit(dai.address, amountDAItoDeposit, '0');
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//user 2 deposits 1 ETH
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const amountETHtoDeposit = await convertToCurrencyDecimals(weth.address, '1');
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//mints WETH to borrower
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await weth.connect(borrower.signer).mint(await convertToCurrencyDecimals(weth.address, '1000'));
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//approve protocol to access the borrower wallet
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await weth.connect(borrower.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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await pool.connect(borrower.signer).deposit(weth.address, amountETHtoDeposit, '0');
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//user 2 borrows
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const userGlobalData = await pool.getUserAccountData(borrower.address);
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const daiPrice = await oracle.getAssetPrice(dai.address);
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const amountDAIToBorrow = await convertToCurrencyDecimals(
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dai.address,
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new BigNumber(userGlobalData.availableBorrowsETH.toString())
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.div(daiPrice.toString())
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.multipliedBy(0.95)
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.toFixed(0)
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);
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await pool
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.connect(borrower.signer)
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.borrow(dai.address, amountDAIToBorrow, RateMode.Stable, '0', borrower.address);
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const userGlobalDataAfter = await pool.getUserAccountData(borrower.address);
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expect(userGlobalDataAfter.currentLiquidationThreshold.toString()).to.be.bignumber.equal(
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'8000',
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INVALID_HF
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);
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});
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it('LIQUIDATION - Drop the health factor below 1', async () => {
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const {dai, weth, users, pool, oracle} = testEnv;
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const borrower = users[1];
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const daiPrice = await oracle.getAssetPrice(dai.address);
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await oracle.setAssetPrice(
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dai.address,
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new BigNumber(daiPrice.toString()).multipliedBy(1.25).toFixed(0)
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);
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const userGlobalData = await pool.getUserAccountData(borrower.address);
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expect(userGlobalData.healthFactor.toString()).to.be.bignumber.lt(
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oneEther.toFixed(0),
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INVALID_HF
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);
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});
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it('LIQUIDATION - Liquidates the borrow', async () => {
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const {dai, weth, users, pool, oracle} = testEnv;
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const liquidator = users[3];
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const borrower = users[1];
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//mints dai to the liquidator
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await dai.connect(liquidator.signer).mint(await convertToCurrencyDecimals(dai.address, '1000'));
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//approve protocol to access the liquidator wallet
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await dai.connect(liquidator.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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const daiReserveDataBefore = await pool.getReserveData(dai.address);
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const ethReserveDataBefore = await pool.getReserveData(weth.address);
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const userReserveDataBefore = await getUserData(pool, dai.address, borrower.address);
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const amountToLiquidate = userReserveDataBefore.currentStableDebt.div(2).toFixed(0);
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await increaseTime(100);
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const tx = await pool
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.connect(liquidator.signer)
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.liquidationCall(weth.address, dai.address, borrower.address, amountToLiquidate, false);
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const userReserveDataAfter = await getUserData(pool, dai.address, borrower.address);
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const daiReserveDataAfter = await pool.getReserveData(dai.address);
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const ethReserveDataAfter = await pool.getReserveData(weth.address);
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const collateralPrice = await oracle.getAssetPrice(weth.address);
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const principalPrice = await oracle.getAssetPrice(dai.address);
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const collateralDecimals = (
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await pool.getReserveConfigurationData(weth.address)
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).decimals.toString();
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const principalDecimals = (
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await pool.getReserveConfigurationData(dai.address)
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).decimals.toString();
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const expectedCollateralLiquidated = new BigNumber(principalPrice.toString())
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.times(new BigNumber(amountToLiquidate).times(105))
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.times(new BigNumber(10).pow(collateralDecimals))
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.div(
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new BigNumber(collateralPrice.toString()).times(new BigNumber(10).pow(principalDecimals))
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)
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.div(100)
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.decimalPlaces(0, BigNumber.ROUND_DOWN);
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if (!tx.blockNumber) {
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expect(false, 'Invalid block number');
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return;
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}
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const txTimestamp = new BigNumber(
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(await BRE.ethers.provider.getBlock(tx.blockNumber)).timestamp
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);
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const stableDebtBeforeTx = calcExpectedStableDebtTokenBalance(
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userReserveDataBefore,
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txTimestamp
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);
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expect(userReserveDataAfter.currentStableDebt.toString()).to.be.bignumber.almostEqual(
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stableDebtBeforeTx.minus(amountToLiquidate).toFixed(0),
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'Invalid user debt after liquidation'
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);
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//the liquidity index of the principal reserve needs to be bigger than the index before
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expect(daiReserveDataAfter.liquidityIndex.toString()).to.be.bignumber.gte(
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daiReserveDataBefore.liquidityIndex.toString(),
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'Invalid liquidity index'
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);
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//the principal APY after a liquidation needs to be lower than the APY before
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expect(daiReserveDataAfter.liquidityRate.toString()).to.be.bignumber.lt(
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daiReserveDataBefore.liquidityRate.toString(),
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'Invalid liquidity APY'
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);
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expect(daiReserveDataAfter.availableLiquidity.toString()).to.be.bignumber.almostEqual(
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new BigNumber(daiReserveDataBefore.availableLiquidity.toString())
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.plus(amountToLiquidate)
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.toFixed(0),
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'Invalid principal available liquidity'
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);
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expect(ethReserveDataAfter.availableLiquidity.toString()).to.be.bignumber.almostEqual(
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new BigNumber(ethReserveDataBefore.availableLiquidity.toString())
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.minus(expectedCollateralLiquidated)
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.toFixed(0),
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'Invalid collateral available liquidity'
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);
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});
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it('User 3 deposits 1000 USDC, user 4 1 WETH, user 4 borrows - drops HF, liquidates the borrow', async () => {
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const {usdc, users, pool, oracle, weth} = testEnv;
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const depositor = users[3];
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const borrower = users[4];
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const liquidator = users[5];
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//mints USDC to depositor
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await usdc
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.connect(depositor.signer)
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.mint(await convertToCurrencyDecimals(usdc.address, '1000'));
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//approve protocol to access depositor wallet
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await usdc.connect(depositor.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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//depositor deposits 1000 USDC
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const amountUSDCtoDeposit = await convertToCurrencyDecimals(usdc.address, '1000');
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await pool.connect(depositor.signer).deposit(usdc.address, amountUSDCtoDeposit, '0');
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//borrower deposits 1 ETH
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const amountETHtoDeposit = await convertToCurrencyDecimals(weth.address, '1');
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//mints WETH to borrower
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await weth.connect(borrower.signer).mint(await convertToCurrencyDecimals(weth.address, '1000'));
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//approve protocol to access the borrower wallet
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await weth.connect(borrower.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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await pool.connect(borrower.signer).deposit(weth.address, amountETHtoDeposit, '0');
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//borrower borrows
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const userGlobalData = await pool.getUserAccountData(borrower.address);
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const usdcPrice = await oracle.getAssetPrice(usdc.address);
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const amountUSDCToBorrow = await convertToCurrencyDecimals(
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usdc.address,
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new BigNumber(userGlobalData.availableBorrowsETH.toString())
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.div(usdcPrice.toString())
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.multipliedBy(0.9502)
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.toFixed(0)
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);
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await pool
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.connect(borrower.signer)
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.borrow(usdc.address, amountUSDCToBorrow, RateMode.Stable, '0', borrower.address);
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//drops HF below 1
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await oracle.setAssetPrice(
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usdc.address,
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new BigNumber(usdcPrice.toString()).multipliedBy(1.2).toFixed(0)
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);
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//mints dai to the liquidator
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await usdc
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.connect(liquidator.signer)
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.mint(await convertToCurrencyDecimals(usdc.address, '1000'));
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//approve protocol to access depositor wallet
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await usdc.connect(liquidator.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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const userReserveDataBefore = await pool.getUserReserveData(usdc.address, borrower.address);
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const usdcReserveDataBefore = await pool.getReserveData(usdc.address);
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const ethReserveDataBefore = await pool.getReserveData(weth.address);
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const amountToLiquidate = BRE.ethers.BigNumber.from(
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userReserveDataBefore.currentStableDebt.toString()
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)
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.div(2)
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.toString();
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await pool
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.connect(liquidator.signer)
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.liquidationCall(weth.address, usdc.address, borrower.address, amountToLiquidate, false);
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const userReserveDataAfter = await pool.getUserReserveData(usdc.address, borrower.address);
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const userGlobalDataAfter = await pool.getUserAccountData(borrower.address);
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const usdcReserveDataAfter = await pool.getReserveData(usdc.address);
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const ethReserveDataAfter = await pool.getReserveData(weth.address);
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const collateralPrice = await oracle.getAssetPrice(weth.address);
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const principalPrice = await oracle.getAssetPrice(usdc.address);
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const collateralDecimals = (
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await pool.getReserveConfigurationData(weth.address)
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).decimals.toString();
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const principalDecimals = (
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await pool.getReserveConfigurationData(usdc.address)
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).decimals.toString();
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const expectedCollateralLiquidated = new BigNumber(principalPrice.toString())
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.times(new BigNumber(amountToLiquidate).times(105))
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.times(new BigNumber(10).pow(collateralDecimals))
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.div(
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new BigNumber(collateralPrice.toString()).times(new BigNumber(10).pow(principalDecimals))
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)
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.div(100)
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.decimalPlaces(0, BigNumber.ROUND_DOWN);
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expect(userGlobalDataAfter.healthFactor.toString()).to.be.bignumber.gt(
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oneEther.toFixed(0),
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'Invalid health factor'
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);
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expect(userReserveDataAfter.currentStableDebt.toString()).to.be.bignumber.almostEqual(
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new BigNumber(userReserveDataBefore.currentStableDebt.toString())
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.minus(amountToLiquidate)
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.toFixed(0),
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'Invalid user borrow balance after liquidation'
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);
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//the liquidity index of the principal reserve needs to be bigger than the index before
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expect(usdcReserveDataAfter.liquidityIndex.toString()).to.be.bignumber.gte(
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usdcReserveDataBefore.liquidityIndex.toString(),
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'Invalid liquidity index'
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);
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//the principal APY after a liquidation needs to be lower than the APY before
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expect(usdcReserveDataAfter.liquidityRate.toString()).to.be.bignumber.lt(
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usdcReserveDataBefore.liquidityRate.toString(),
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'Invalid liquidity APY'
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);
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expect(usdcReserveDataAfter.availableLiquidity.toString()).to.be.bignumber.almostEqual(
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new BigNumber(usdcReserveDataBefore.availableLiquidity.toString())
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.plus(amountToLiquidate)
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.toFixed(0),
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'Invalid principal available liquidity'
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);
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expect(ethReserveDataAfter.availableLiquidity.toString()).to.be.bignumber.almostEqual(
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new BigNumber(ethReserveDataBefore.availableLiquidity.toString())
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.minus(expectedCollateralLiquidated)
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.toFixed(0),
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'Invalid collateral available liquidity'
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);
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});
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it('User 4 deposits 1000 LEND - drops HF, liquidates the LEND, which results on a lower amount being liquidated', async () => {
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const {lend, usdc, users, pool, oracle} = testEnv;
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const depositor = users[3];
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const borrower = users[4];
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const liquidator = users[5];
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//mints LEND to borrower
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await lend.connect(borrower.signer).mint(await convertToCurrencyDecimals(lend.address, '1000'));
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//approve protocol to access the borrower wallet
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await lend.connect(borrower.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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//borrower deposits 1000 LEND
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const amountLENDtoDeposit = await convertToCurrencyDecimals(lend.address, '1000');
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await pool.connect(borrower.signer).deposit(lend.address, amountLENDtoDeposit, '0');
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const usdcPrice = await oracle.getAssetPrice(usdc.address);
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//drops HF below 1
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await oracle.setAssetPrice(
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usdc.address,
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new BigNumber(usdcPrice.toString()).multipliedBy(1.12).toFixed(0)
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);
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//mints usdc to the liquidator
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await usdc
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.connect(liquidator.signer)
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.mint(await convertToCurrencyDecimals(usdc.address, '1000'));
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//approve protocol to access depositor wallet
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await usdc.connect(liquidator.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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const userReserveDataBefore = await pool.getUserReserveData(usdc.address, borrower.address);
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const usdcReserveDataBefore = await pool.getReserveData(usdc.address);
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const lendReserveDataBefore = await pool.getReserveData(lend.address);
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const amountToLiquidate = new BigNumber(userReserveDataBefore.currentStableDebt.toString())
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.div(2)
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.decimalPlaces(0, BigNumber.ROUND_DOWN)
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.toFixed(0);
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const collateralPrice = await oracle.getAssetPrice(lend.address);
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const principalPrice = await oracle.getAssetPrice(usdc.address);
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await pool
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.connect(liquidator.signer)
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.liquidationCall(lend.address, usdc.address, borrower.address, amountToLiquidate, false);
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const userReserveDataAfter = await pool.getUserReserveData(usdc.address, borrower.address);
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const userGlobalDataAfter = await pool.getUserAccountData(borrower.address);
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const usdcReserveDataAfter = await pool.getReserveData(usdc.address);
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const lendReserveDataAfter = await pool.getReserveData(lend.address);
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const collateralDecimals = (
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await pool.getReserveConfigurationData(lend.address)
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).decimals.toString();
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const principalDecimals = (
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await pool.getReserveConfigurationData(usdc.address)
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).decimals.toString();
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const expectedCollateralLiquidated = oneEther.multipliedBy('1000');
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const liquidationBonus = (
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await pool.getReserveConfigurationData(lend.address)
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).liquidationBonus.toString();
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const expectedPrincipal = new BigNumber(collateralPrice.toString())
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.times(expectedCollateralLiquidated)
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.times(new BigNumber(10).pow(principalDecimals))
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.div(
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new BigNumber(principalPrice.toString()).times(new BigNumber(10).pow(collateralDecimals))
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)
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.times(10000)
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.div(liquidationBonus.toString())
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.decimalPlaces(0, BigNumber.ROUND_DOWN);
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expect(userGlobalDataAfter.healthFactor.toString()).to.be.bignumber.gt(
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oneEther.toFixed(0),
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'Invalid health factor'
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);
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expect(userReserveDataAfter.currentStableDebt.toString()).to.be.bignumber.almostEqual(
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new BigNumber(userReserveDataBefore.currentStableDebt.toString())
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.minus(expectedPrincipal)
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.toFixed(0),
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'Invalid user borrow balance after liquidation'
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);
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expect(usdcReserveDataAfter.availableLiquidity.toString()).to.be.bignumber.almostEqual(
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new BigNumber(usdcReserveDataBefore.availableLiquidity.toString())
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.plus(expectedPrincipal)
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.toFixed(0),
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'Invalid principal available liquidity'
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);
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expect(lendReserveDataAfter.availableLiquidity.toString()).to.be.bignumber.almostEqual(
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new BigNumber(lendReserveDataBefore.availableLiquidity.toString())
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.minus(expectedCollateralLiquidated)
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.toFixed(0),
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'Invalid collateral available liquidity'
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);
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});
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});
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