aave-protocol-v2/test/flashloan.spec.ts
2020-08-20 12:21:42 +02:00

201 lines
6.7 KiB
TypeScript

import {TestEnv, makeSuite} from './helpers/make-suite';
import {APPROVAL_AMOUNT_LENDING_POOL, oneRay} from '../helpers/constants';
import {convertToCurrencyDecimals, getMockFlashLoanReceiver} from '../helpers/contracts-helpers';
import {ethers} from 'ethers';
import {MockFlashLoanReceiver} from '../types/MockFlashLoanReceiver';
import {ProtocolErrors} from '../helpers/types';
import BigNumber from 'bignumber.js';
const {expect} = require('chai');
makeSuite('LendingPool FlashLoan function', (testEnv: TestEnv) => {
let _mockFlashLoanReceiver = {} as MockFlashLoanReceiver;
const {
INCONSISTENT_PROTOCOL_BALANCE,
TOO_SMALL_FLASH_LOAN,
NOT_ENOUGH_LIQUIDITY_TO_BORROW,
} = ProtocolErrors;
before(async () => {
_mockFlashLoanReceiver = await getMockFlashLoanReceiver();
});
it('Deposits ETH into the reserve', async () => {
const {pool, weth} = testEnv;
const amountToDeposit = ethers.utils.parseEther('1');
await weth.mint(amountToDeposit);
await weth.approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
await pool.deposit(weth.address, amountToDeposit, '0');
});
it('Takes ETH flashloan, returns the funds correctly', async () => {
const {pool, deployer, weth} = testEnv;
await pool.flashLoan(
_mockFlashLoanReceiver.address,
weth.address,
ethers.utils.parseEther('0.8'),
'0x10'
);
ethers.utils.parseUnits('10000');
const reserveData = await pool.getReserveData(weth.address);
const currentLiquidityRate = reserveData.liquidityRate;
const currentLiquidityIndex = reserveData.liquidityIndex;
const totalLiquidity = new BigNumber(reserveData.availableLiquidity.toString())
.plus(reserveData.totalBorrowsStable.toString())
.plus(reserveData.totalBorrowsVariable.toString());
expect(totalLiquidity.toString()).to.be.equal('1000720000000000000');
expect(currentLiquidityRate.toString()).to.be.equal('0');
expect(currentLiquidityIndex.toString()).to.be.equal('1000720000000000000000000000');
});
it('Takes an ETH flashloan as big as the available liquidity', async () => {
const {pool, weth} = testEnv;
const reserveDataBefore = await pool.getReserveData(weth.address);
console.log("Total liquidity is ", reserveDataBefore.availableLiquidity.toString());
const txResult = await pool.flashLoan(
_mockFlashLoanReceiver.address,
weth.address,
'1000720000000000000',
'0x10'
);
const reserveData = await pool.getReserveData(weth.address);
const currentLiqudityRate = reserveData.liquidityRate;
const currentLiquidityIndex = reserveData.liquidityIndex;
const totalLiquidity = new BigNumber(reserveData.availableLiquidity.toString())
.plus(reserveData.totalBorrowsStable.toString())
.plus(reserveData.totalBorrowsVariable.toString());
expect(totalLiquidity.toString()).to.be.equal('1001620648000000000');
expect(currentLiqudityRate.toString()).to.be.equal('0');
expect(currentLiquidityIndex.toString()).to.be.equal('1001620648000000000000000000');
});
it('Takes WETH flashloan, does not return the funds (revert expected)', async () => {
const {pool, deployer, weth} = testEnv;
// move funds to the MockFlashLoanReceiver contract to pay the fee
await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
await expect(
pool.flashLoan(
_mockFlashLoanReceiver.address,
weth.address,
ethers.utils.parseEther('0.8'),
'0x10'
)
).to.be.revertedWith(INCONSISTENT_PROTOCOL_BALANCE);
});
it('tries to take a very small flashloan, which would result in 0 fees (revert expected)', async () => {
const {pool, weth} = testEnv;
await expect(
pool.flashLoan(
_mockFlashLoanReceiver.address,
weth.address,
'1', //1 wei loan
'0x10'
)
).to.be.revertedWith(TOO_SMALL_FLASH_LOAN);
});
it('tries to take a flashloan that is bigger than the available liquidity (revert expected)', async () => {
const {pool, weth} = testEnv;
await expect(
pool.flashLoan(
_mockFlashLoanReceiver.address,
weth.address,
'1004415000000000000', //slightly higher than the available liquidity
'0x10'
),
NOT_ENOUGH_LIQUIDITY_TO_BORROW
).to.be.revertedWith(NOT_ENOUGH_LIQUIDITY_TO_BORROW);
});
it('tries to take a flashloan using a non contract address as receiver (revert expected)', async () => {
const {pool, deployer, weth} = testEnv;
await expect(pool.flashLoan(deployer.address, weth.address, '1000000000000000000', '0x10')).to
.be.reverted;
});
it('Deposits DAI into the reserve', async () => {
const {dai, pool} = testEnv;
await dai.mint(await convertToCurrencyDecimals(dai.address, '1000'));
await dai.approve(pool.address, APPROVAL_AMOUNT_LENDING_POOL);
const amountToDeposit = await convertToCurrencyDecimals(dai.address, '1000');
await pool.deposit(dai.address, amountToDeposit, '0');
});
it('Takes out a 500 DAI flashloan, returns the funds correctly', async () => {
const {dai, pool, deployer: depositor} = testEnv;
await _mockFlashLoanReceiver.setFailExecutionTransfer(false);
await pool.flashLoan(
_mockFlashLoanReceiver.address,
dai.address,
ethers.utils.parseEther('500'),
'0x10'
);
const reserveData = await pool.getReserveData(dai.address);
const userData = await pool.getUserReserveData(dai.address, depositor.address);
const totalLiquidity = reserveData.availableLiquidity
.add(reserveData.totalBorrowsStable)
.add(reserveData.totalBorrowsVariable)
.toString();
const currentLiqudityRate = reserveData.liquidityRate.toString();
const currentLiquidityIndex = reserveData.liquidityIndex.toString();
const currentUserBalance = userData.currentATokenBalance.toString();
const expectedLiquidity = ethers.utils.parseEther('1000.450');
expect(totalLiquidity).to.be.equal(expectedLiquidity, 'Invalid total liquidity');
expect(currentLiqudityRate).to.be.equal('0', 'Invalid liquidity rate');
expect(currentLiquidityIndex).to.be.equal(
new BigNumber('1.00045').multipliedBy(oneRay).toFixed(),
'Invalid liquidity index'
);
expect(currentUserBalance.toString()).to.be.equal(expectedLiquidity, 'Invalid user balance');
});
it('Takes out a 500 DAI flashloan, does not return the funds (revert expected)', async () => {
const {dai, pool} = testEnv;
await _mockFlashLoanReceiver.setFailExecutionTransfer(true);
await expect(
pool.flashLoan(
_mockFlashLoanReceiver.address,
dai.address,
ethers.utils.parseEther('500'),
'0x10'
),
INCONSISTENT_PROTOCOL_BALANCE
).to.be.revertedWith(INCONSISTENT_PROTOCOL_BALANCE);
});
});