mirror of
https://github.com/Instadapp/aave-protocol-v2.git
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376 lines
13 KiB
TypeScript
376 lines
13 KiB
TypeScript
import BigNumber from 'bignumber.js';
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import {TestEnv, makeSuite} from './helpers/make-suite';
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import {APPROVAL_AMOUNT_LENDING_POOL, oneRay} from '../helpers/constants';
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import {convertToCurrencyDecimals, getContract} from '../helpers/contracts-helpers';
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import {ethers} from 'ethers';
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import {MockFlashLoanReceiver} from '../types/MockFlashLoanReceiver';
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import {ProtocolErrors, eContractid} from '../helpers/types';
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import {VariableDebtToken} from '../types/VariableDebtToken';
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import {StableDebtToken} from '../types/StableDebtToken';
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import {getMockFlashLoanReceiver} from '../helpers/contracts-getters';
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const {expect} = require('chai');
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makeSuite('LendingPool FlashLoan function', (testEnv: TestEnv) => {
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let _mockFlashLoanReceiver = {} as MockFlashLoanReceiver;
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const {
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COLLATERAL_BALANCE_IS_0,
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REQUESTED_AMOUNT_TOO_SMALL,
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TRANSFER_AMOUNT_EXCEEDS_BALANCE,
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INVALID_FLASHLOAN_MODE,
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SAFEERC20_LOWLEVEL_CALL,
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IS_PAUSED,
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INVALID_FLASH_LOAN_EXECUTOR_RETURN,
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} = ProtocolErrors;
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before(async () => {
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_mockFlashLoanReceiver = await getMockFlashLoanReceiver();
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});
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it('Deposits WETH into the reserve', async () => {
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const {pool, weth} = testEnv;
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const userAddress = await pool.signer.getAddress();
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const amountToDeposit = ethers.utils.parseEther('1');
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await weth.mint(amountToDeposit);
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await weth.approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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await pool.deposit(weth.address, amountToDeposit, userAddress, '0');
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});
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it('Takes WETH flashloan with mode = 0, returns the funds correctly', async () => {
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const {pool, helpersContract, weth} = testEnv;
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await pool.flashLoan(
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_mockFlashLoanReceiver.address,
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[weth.address],
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[ethers.utils.parseEther('0.8')],
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0,
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'0x10',
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'0'
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);
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ethers.utils.parseUnits('10000');
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const reserveData = await helpersContract.getReserveData(weth.address);
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const currentLiquidityRate = reserveData.liquidityRate;
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const currentLiquidityIndex = reserveData.liquidityIndex;
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const totalLiquidity = new BigNumber(reserveData.availableLiquidity.toString())
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.plus(reserveData.totalStableDebt.toString())
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.plus(reserveData.totalVariableDebt.toString());
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expect(totalLiquidity.toString()).to.be.equal('1000720000000000000');
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expect(currentLiquidityRate.toString()).to.be.equal('0');
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expect(currentLiquidityIndex.toString()).to.be.equal('1000720000000000000000000000');
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});
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it('Takes an ETH flashloan with mode = 0 as big as the available liquidity', async () => {
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const {pool, helpersContract, weth} = testEnv;
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const reserveDataBefore = await helpersContract.getReserveData(weth.address);
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const txResult = await pool.flashLoan(
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_mockFlashLoanReceiver.address,
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[weth.address],
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['1000720000000000000'],
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0,
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'0x10',
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'0'
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);
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const reserveData = await helpersContract.getReserveData(weth.address);
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const currentLiqudityRate = reserveData.liquidityRate;
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const currentLiquidityIndex = reserveData.liquidityIndex;
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const totalLiquidity = new BigNumber(reserveData.availableLiquidity.toString())
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.plus(reserveData.totalStableDebt.toString())
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.plus(reserveData.totalVariableDebt.toString());
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expect(totalLiquidity.toString()).to.be.equal('1001620648000000000');
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expect(currentLiqudityRate.toString()).to.be.equal('0');
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expect(currentLiquidityIndex.toString()).to.be.equal('1001620648000000000000000000');
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});
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it('Takes WETH flashloan, does not return the funds with mode = 0. (revert expected)', async () => {
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const {pool, weth, users} = testEnv;
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const caller = users[1];
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await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
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await expect(
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pool
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.connect(caller.signer)
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.flashLoan(
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_mockFlashLoanReceiver.address,
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[weth.address],
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[ethers.utils.parseEther('0.8')],
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0,
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'0x10',
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'0'
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)
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).to.be.revertedWith(SAFEERC20_LOWLEVEL_CALL);
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});
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it('Takes WETH flashloan, simulating a receiver as EOA (revert expected)', async () => {
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const {pool, weth, users} = testEnv;
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const caller = users[1];
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await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
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await _mockFlashLoanReceiver.setSimulateEOA(true);
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await expect(
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pool
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.connect(caller.signer)
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.flashLoan(
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_mockFlashLoanReceiver.address,
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[weth.address],
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[ethers.utils.parseEther('0.8')],
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0,
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'0x10',
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'0'
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)
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).to.be.revertedWith(INVALID_FLASH_LOAN_EXECUTOR_RETURN);
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});
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it('Takes a WETH flashloan with an invalid mode. (revert expected)', async () => {
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const {pool, weth, users} = testEnv;
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const caller = users[1];
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await _mockFlashLoanReceiver.setSimulateEOA(false);
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await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
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await expect(
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pool
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.connect(caller.signer)
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.flashLoan(
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_mockFlashLoanReceiver.address,
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[weth.address],
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[ethers.utils.parseEther('0.8')],
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4,
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'0x10',
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'0'
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)
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).to.be.revertedWith(INVALID_FLASHLOAN_MODE);
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});
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it('Caller deposits 1000 DAI as collateral, Takes WETH flashloan with mode = 2, does not return the funds. A variable loan for caller is created', async () => {
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const {dai, pool, weth, users, helpersContract} = testEnv;
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const caller = users[1];
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await dai.connect(caller.signer).mint(await convertToCurrencyDecimals(dai.address, '1000'));
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await dai.connect(caller.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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const amountToDeposit = await convertToCurrencyDecimals(dai.address, '1000');
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await pool.connect(caller.signer).deposit(dai.address, amountToDeposit, caller.address, '0');
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await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
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await pool
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.connect(caller.signer)
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.flashLoan(
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_mockFlashLoanReceiver.address,
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[weth.address],
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[ethers.utils.parseEther('0.8')],
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2,
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'0x10',
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'0'
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);
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const {variableDebtTokenAddress} = await helpersContract.getReserveTokensAddresses(
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weth.address
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);
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const wethDebtToken = await getContract<VariableDebtToken>(
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eContractid.VariableDebtToken,
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variableDebtTokenAddress
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);
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const callerDebt = await wethDebtToken.balanceOf(caller.address);
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expect(callerDebt.toString()).to.be.equal('800000000000000000', 'Invalid user debt');
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});
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it('tries to take a flashloan that is bigger than the available liquidity (revert expected)', async () => {
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const {pool, weth} = testEnv;
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await expect(
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pool.flashLoan(
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_mockFlashLoanReceiver.address,
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[weth.address],
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['1004415000000000000'], //slightly higher than the available liquidity
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2,
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'0x10',
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'0'
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),
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TRANSFER_AMOUNT_EXCEEDS_BALANCE
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).to.be.revertedWith(SAFEERC20_LOWLEVEL_CALL);
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});
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it('tries to take a flashloan using a non contract address as receiver (revert expected)', async () => {
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const {pool, deployer, weth} = testEnv;
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await expect(
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pool.flashLoan(deployer.address, [weth.address], ['1000000000000000000'], 2, '0x10', '0')
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).to.be.reverted;
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});
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it('Deposits USDC into the reserve', async () => {
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const {usdc, pool} = testEnv;
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const userAddress = await pool.signer.getAddress();
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await usdc.mint(await convertToCurrencyDecimals(usdc.address, '1000'));
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await usdc.approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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const amountToDeposit = await convertToCurrencyDecimals(usdc.address, '1000');
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await pool.deposit(usdc.address, amountToDeposit, userAddress, '0');
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});
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it('Takes out a 500 USDC flashloan, returns the funds correctly', async () => {
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const {usdc, pool, helpersContract, deployer: depositor} = testEnv;
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await _mockFlashLoanReceiver.setFailExecutionTransfer(false);
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const flashloanAmount = await convertToCurrencyDecimals(usdc.address, '500');
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await pool.flashLoan(
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_mockFlashLoanReceiver.address,
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[usdc.address],
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[flashloanAmount],
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0,
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'0x10',
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'0'
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);
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const reserveData = await helpersContract.getReserveData(usdc.address);
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const userData = await helpersContract.getUserReserveData(usdc.address, depositor.address);
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const totalLiquidity = reserveData.availableLiquidity
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.add(reserveData.totalStableDebt)
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.add(reserveData.totalVariableDebt)
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.toString();
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const currentLiqudityRate = reserveData.liquidityRate.toString();
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const currentLiquidityIndex = reserveData.liquidityIndex.toString();
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const currentUserBalance = userData.currentATokenBalance.toString();
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const expectedLiquidity = await convertToCurrencyDecimals(usdc.address, '1000.450');
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expect(totalLiquidity).to.be.equal(expectedLiquidity, 'Invalid total liquidity');
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expect(currentLiqudityRate).to.be.equal('0', 'Invalid liquidity rate');
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expect(currentLiquidityIndex).to.be.equal(
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new BigNumber('1.00045').multipliedBy(oneRay).toFixed(),
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'Invalid liquidity index'
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);
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expect(currentUserBalance.toString()).to.be.equal(expectedLiquidity, 'Invalid user balance');
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});
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it('Takes out a 500 USDC flashloan with mode = 0, does not return the funds. (revert expected)', async () => {
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const {usdc, pool, users} = testEnv;
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const caller = users[2];
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const flashloanAmount = await convertToCurrencyDecimals(usdc.address, '500');
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await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
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await expect(
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pool
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.connect(caller.signer)
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.flashLoan(
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_mockFlashLoanReceiver.address,
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[usdc.address],
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[flashloanAmount],
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2,
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'0x10',
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'0'
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)
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).to.be.revertedWith(COLLATERAL_BALANCE_IS_0);
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});
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it('Caller deposits 5 WETH as collateral, Takes a USDC flashloan with mode = 2, does not return the funds. A loan for caller is created', async () => {
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const {usdc, pool, weth, users, helpersContract} = testEnv;
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const caller = users[2];
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await weth.connect(caller.signer).mint(await convertToCurrencyDecimals(weth.address, '5'));
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await weth.connect(caller.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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const amountToDeposit = await convertToCurrencyDecimals(weth.address, '5');
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await pool.connect(caller.signer).deposit(weth.address, amountToDeposit, caller.address, '0');
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await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
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const flashloanAmount = await convertToCurrencyDecimals(usdc.address, '500');
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await pool
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.connect(caller.signer)
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.flashLoan(_mockFlashLoanReceiver.address, [usdc.address], [flashloanAmount], 2, '0x10', '0');
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const {variableDebtTokenAddress} = await helpersContract.getReserveTokensAddresses(
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usdc.address
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);
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const usdcDebtToken = await getContract<VariableDebtToken>(
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eContractid.VariableDebtToken,
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variableDebtTokenAddress
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);
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const callerDebt = await usdcDebtToken.balanceOf(caller.address);
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expect(callerDebt.toString()).to.be.equal('500000000', 'Invalid user debt');
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});
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it('Caller deposits 1000 DAI as collateral, Takes a WETH flashloan with mode = 0, does not approve the transfer of the funds', async () => {
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const {dai, pool, weth, users} = testEnv;
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const caller = users[3];
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await dai.connect(caller.signer).mint(await convertToCurrencyDecimals(dai.address, '1000'));
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await dai.connect(caller.signer).approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
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const amountToDeposit = await convertToCurrencyDecimals(dai.address, '1000');
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await pool.connect(caller.signer).deposit(dai.address, amountToDeposit, caller.address, '0');
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const flashAmount = ethers.utils.parseEther('0.8');
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await _mockFlashLoanReceiver.setFailExecutionTransfer(false);
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await _mockFlashLoanReceiver.setAmountToApprove(flashAmount.div(2));
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await expect(
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pool
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.connect(caller.signer)
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.flashLoan(_mockFlashLoanReceiver.address, [weth.address], [flashAmount], 0, '0x10', '0')
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).to.be.revertedWith(SAFEERC20_LOWLEVEL_CALL);
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});
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it('Caller takes a WETH flashloan with mode = 1', async () => {
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const {dai, pool, weth, users, helpersContract} = testEnv;
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const caller = users[3];
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const flashAmount = ethers.utils.parseEther('0.8');
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await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
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await pool
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.connect(caller.signer)
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.flashLoan(_mockFlashLoanReceiver.address, [weth.address], [flashAmount], 1, '0x10', '0');
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const {stableDebtTokenAddress} = await helpersContract.getReserveTokensAddresses(weth.address);
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const wethDebtToken = await getContract<StableDebtToken>(
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eContractid.VariableDebtToken,
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stableDebtTokenAddress
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);
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const callerDebt = await wethDebtToken.balanceOf(caller.address);
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expect(callerDebt.toString()).to.be.equal('800000000000000000', 'Invalid user debt');
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});
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});
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