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1109 lines
45 KiB
1109 lines
45 KiB
const { constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
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const { expect } = require('chai');
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const { Enum } = require('../../../helpers/enums');
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const { expectRevertCustomError } = require('../../../helpers/customError');
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const ERC20Decimals = artifacts.require('$ERC20DecimalsMock');
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const ERC4626 = artifacts.require('$ERC4626');
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const ERC4626LimitsMock = artifacts.require('$ERC4626LimitsMock');
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const ERC4626OffsetMock = artifacts.require('$ERC4626OffsetMock');
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const ERC4626FeesMock = artifacts.require('$ERC4626FeesMock');
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const ERC20ExcessDecimalsMock = artifacts.require('ERC20ExcessDecimalsMock');
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const ERC20Reentrant = artifacts.require('$ERC20Reentrant');
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contract('ERC4626', function (accounts) {
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const [holder, recipient, spender, other, user1, user2] = accounts;
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const name = 'My Token';
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const symbol = 'MTKN';
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const decimals = web3.utils.toBN(18);
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it('inherit decimals if from asset', async function () {
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for (const decimals of [0, 9, 12, 18, 36].map(web3.utils.toBN)) {
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const token = await ERC20Decimals.new('', '', decimals);
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const vault = await ERC4626.new('', '', token.address);
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expect(await vault.decimals()).to.be.bignumber.equal(decimals);
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}
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});
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it('asset has not yet been created', async function () {
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const vault = await ERC4626.new('', '', other);
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expect(await vault.decimals()).to.be.bignumber.equal(decimals);
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});
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it('underlying excess decimals', async function () {
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const token = await ERC20ExcessDecimalsMock.new();
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const vault = await ERC4626.new('', '', token.address);
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expect(await vault.decimals()).to.be.bignumber.equal(decimals);
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});
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it('decimals overflow', async function () {
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for (const offset of [243, 250, 255].map(web3.utils.toBN)) {
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const token = await ERC20Decimals.new('', '', decimals);
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const vault = await ERC4626OffsetMock.new(name + ' Vault', symbol + 'V', token.address, offset);
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await expectRevert(
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vault.decimals(),
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'reverted with panic code 0x11 (Arithmetic operation underflowed or overflowed outside of an unchecked block)',
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);
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}
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});
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describe('reentrancy', async function () {
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const reenterType = Enum('No', 'Before', 'After');
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const amount = web3.utils.toBN(1000000000000000000);
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const reenterAmount = web3.utils.toBN(1000000000);
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let token;
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let vault;
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beforeEach(async function () {
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token = await ERC20Reentrant.new();
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// Use offset 1 so the rate is not 1:1 and we can't possibly confuse assets and shares
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vault = await ERC4626OffsetMock.new('', '', token.address, 1);
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// Funds and approval for tests
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await token.$_mint(holder, amount);
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await token.$_mint(other, amount);
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await token.$_approve(holder, vault.address, constants.MAX_UINT256);
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await token.$_approve(other, vault.address, constants.MAX_UINT256);
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await token.$_approve(token.address, vault.address, constants.MAX_UINT256);
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});
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// During a `_deposit`, the vault does `transferFrom(depositor, vault, assets)` -> `_mint(receiver, shares)`
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// such that a reentrancy BEFORE the transfer guarantees the price is kept the same.
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// If the order of transfer -> mint is changed to mint -> transfer, the reentrancy could be triggered on an
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// intermediate state in which the ratio of assets/shares has been decreased (more shares than assets).
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it('correct share price is observed during reentrancy before deposit', async function () {
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// mint token for deposit
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await token.$_mint(token.address, reenterAmount);
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// Schedules a reentrancy from the token contract
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await token.scheduleReenter(
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reenterType.Before,
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vault.address,
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vault.contract.methods.deposit(reenterAmount, holder).encodeABI(),
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);
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// Initial share price
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const sharesForDeposit = await vault.previewDeposit(amount, { from: holder });
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const sharesForReenter = await vault.previewDeposit(reenterAmount, { from: holder });
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// Do deposit normally, triggering the _beforeTokenTransfer hook
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const receipt = await vault.deposit(amount, holder, { from: holder });
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// Main deposit event
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await expectEvent(receipt, 'Deposit', {
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sender: holder,
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owner: holder,
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assets: amount,
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shares: sharesForDeposit,
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});
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// Reentrant deposit event → uses the same price
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await expectEvent(receipt, 'Deposit', {
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sender: token.address,
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owner: holder,
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assets: reenterAmount,
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shares: sharesForReenter,
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});
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// Assert prices is kept
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const sharesAfter = await vault.previewDeposit(amount, { from: holder });
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expect(sharesForDeposit).to.be.bignumber.eq(sharesAfter);
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});
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// During a `_withdraw`, the vault does `_burn(owner, shares)` -> `transfer(receiver, assets)`
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// such that a reentrancy AFTER the transfer guarantees the price is kept the same.
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// If the order of burn -> transfer is changed to transfer -> burn, the reentrancy could be triggered on an
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// intermediate state in which the ratio of shares/assets has been decreased (more assets than shares).
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it('correct share price is observed during reentrancy after withdraw', async function () {
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// Deposit into the vault: holder gets `amount` share, token.address gets `reenterAmount` shares
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await vault.deposit(amount, holder, { from: holder });
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await vault.deposit(reenterAmount, token.address, { from: other });
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// Schedules a reentrancy from the token contract
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await token.scheduleReenter(
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reenterType.After,
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vault.address,
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vault.contract.methods.withdraw(reenterAmount, holder, token.address).encodeABI(),
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);
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// Initial share price
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const sharesForWithdraw = await vault.previewWithdraw(amount, { from: holder });
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const sharesForReenter = await vault.previewWithdraw(reenterAmount, { from: holder });
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// Do withdraw normally, triggering the _afterTokenTransfer hook
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const receipt = await vault.withdraw(amount, holder, holder, { from: holder });
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// Main withdraw event
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await expectEvent(receipt, 'Withdraw', {
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sender: holder,
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receiver: holder,
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owner: holder,
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assets: amount,
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shares: sharesForWithdraw,
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});
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// Reentrant withdraw event → uses the same price
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await expectEvent(receipt, 'Withdraw', {
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sender: token.address,
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receiver: holder,
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owner: token.address,
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assets: reenterAmount,
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shares: sharesForReenter,
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});
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// Assert price is kept
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const sharesAfter = await vault.previewWithdraw(amount, { from: holder });
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expect(sharesForWithdraw).to.be.bignumber.eq(sharesAfter);
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});
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// Donate newly minted tokens to the vault during the reentracy causes the share price to increase.
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// Still, the deposit that trigger the reentracy is not affected and get the previewed price.
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// Further deposits will get a different price (getting fewer shares for the same amount of assets)
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it('share price change during reentracy does not affect deposit', async function () {
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// Schedules a reentrancy from the token contract that mess up the share price
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await token.scheduleReenter(
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reenterType.Before,
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token.address,
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token.contract.methods.$_mint(vault.address, reenterAmount).encodeABI(),
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);
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// Price before
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const sharesBefore = await vault.previewDeposit(amount);
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// Deposit, triggering the _beforeTokenTransfer hook
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const receipt = await vault.deposit(amount, holder, { from: holder });
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// Price is as previewed
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await expectEvent(receipt, 'Deposit', {
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sender: holder,
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owner: holder,
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assets: amount,
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shares: sharesBefore,
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});
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// Price was modified during reentrancy
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const sharesAfter = await vault.previewDeposit(amount);
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expect(sharesAfter).to.be.bignumber.lt(sharesBefore);
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});
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// Burn some tokens from the vault during the reentracy causes the share price to drop.
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// Still, the withdraw that trigger the reentracy is not affected and get the previewed price.
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// Further withdraw will get a different price (needing more shares for the same amount of assets)
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it('share price change during reentracy does not affect withdraw', async function () {
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await vault.deposit(amount, other, { from: other });
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await vault.deposit(amount, holder, { from: holder });
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// Schedules a reentrancy from the token contract that mess up the share price
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await token.scheduleReenter(
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reenterType.After,
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token.address,
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token.contract.methods.$_burn(vault.address, reenterAmount).encodeABI(),
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);
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// Price before
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const sharesBefore = await vault.previewWithdraw(amount);
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// Withdraw, triggering the _afterTokenTransfer hook
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const receipt = await vault.withdraw(amount, holder, holder, { from: holder });
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// Price is as previewed
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await expectEvent(receipt, 'Withdraw', {
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sender: holder,
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receiver: holder,
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owner: holder,
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assets: amount,
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shares: sharesBefore,
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});
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// Price was modified during reentrancy
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const sharesAfter = await vault.previewWithdraw(amount);
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expect(sharesAfter).to.be.bignumber.gt(sharesBefore);
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});
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});
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describe('limits', async function () {
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beforeEach(async function () {
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this.token = await ERC20Decimals.new(name, symbol, decimals);
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this.vault = await ERC4626LimitsMock.new(name + ' Vault', symbol + 'V', this.token.address);
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});
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it('reverts on deposit() above max deposit', async function () {
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const maxDeposit = await this.vault.maxDeposit(holder);
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await expectRevertCustomError(this.vault.deposit(maxDeposit.addn(1), recipient), 'ERC4626ExceededMaxDeposit', [
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recipient,
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maxDeposit.addn(1),
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maxDeposit,
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]);
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});
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it('reverts on mint() above max mint', async function () {
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const maxMint = await this.vault.maxMint(holder);
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await expectRevertCustomError(this.vault.mint(maxMint.addn(1), recipient), 'ERC4626ExceededMaxMint', [
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recipient,
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maxMint.addn(1),
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maxMint,
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]);
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});
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it('reverts on withdraw() above max withdraw', async function () {
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const maxWithdraw = await this.vault.maxWithdraw(holder);
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await expectRevertCustomError(
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this.vault.withdraw(maxWithdraw.addn(1), recipient, holder),
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'ERC4626ExceededMaxWithdraw',
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[holder, maxWithdraw.addn(1), maxWithdraw],
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);
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});
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it('reverts on redeem() above max redeem', async function () {
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const maxRedeem = await this.vault.maxRedeem(holder);
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await expectRevertCustomError(
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this.vault.redeem(maxRedeem.addn(1), recipient, holder),
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'ERC4626ExceededMaxRedeem',
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[holder, maxRedeem.addn(1), maxRedeem],
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);
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});
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});
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for (const offset of [0, 6, 18].map(web3.utils.toBN)) {
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const parseToken = token => web3.utils.toBN(10).pow(decimals).muln(token);
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const parseShare = share => web3.utils.toBN(10).pow(decimals.add(offset)).muln(share);
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const virtualAssets = web3.utils.toBN(1);
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const virtualShares = web3.utils.toBN(10).pow(offset);
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describe(`offset: ${offset}`, function () {
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beforeEach(async function () {
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this.token = await ERC20Decimals.new(name, symbol, decimals);
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this.vault = await ERC4626OffsetMock.new(name + ' Vault', symbol + 'V', this.token.address, offset);
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await this.token.$_mint(holder, constants.MAX_INT256); // 50% of maximum
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await this.token.approve(this.vault.address, constants.MAX_UINT256, { from: holder });
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await this.vault.approve(spender, constants.MAX_UINT256, { from: holder });
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});
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it('metadata', async function () {
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expect(await this.vault.name()).to.be.equal(name + ' Vault');
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expect(await this.vault.symbol()).to.be.equal(symbol + 'V');
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expect(await this.vault.decimals()).to.be.bignumber.equal(decimals.add(offset));
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expect(await this.vault.asset()).to.be.equal(this.token.address);
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});
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describe('empty vault: no assets & no shares', function () {
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it('status', async function () {
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expect(await this.vault.totalAssets()).to.be.bignumber.equal('0');
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});
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it('deposit', async function () {
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expect(await this.vault.maxDeposit(holder)).to.be.bignumber.equal(constants.MAX_UINT256);
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expect(await this.vault.previewDeposit(parseToken(1))).to.be.bignumber.equal(parseShare(1));
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const { tx } = await this.vault.deposit(parseToken(1), recipient, { from: holder });
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await expectEvent.inTransaction(tx, this.token, 'Transfer', {
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from: holder,
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to: this.vault.address,
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value: parseToken(1),
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});
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await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
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from: constants.ZERO_ADDRESS,
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to: recipient,
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value: parseShare(1),
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});
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await expectEvent.inTransaction(tx, this.vault, 'Deposit', {
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sender: holder,
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owner: recipient,
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assets: parseToken(1),
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shares: parseShare(1),
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});
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});
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it('mint', async function () {
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expect(await this.vault.maxMint(holder)).to.be.bignumber.equal(constants.MAX_UINT256);
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expect(await this.vault.previewMint(parseShare(1))).to.be.bignumber.equal(parseToken(1));
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const { tx } = await this.vault.mint(parseShare(1), recipient, { from: holder });
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await expectEvent.inTransaction(tx, this.token, 'Transfer', {
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from: holder,
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to: this.vault.address,
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value: parseToken(1),
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});
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await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
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from: constants.ZERO_ADDRESS,
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to: recipient,
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value: parseShare(1),
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});
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await expectEvent.inTransaction(tx, this.vault, 'Deposit', {
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sender: holder,
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owner: recipient,
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assets: parseToken(1),
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shares: parseShare(1),
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});
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});
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it('withdraw', async function () {
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expect(await this.vault.maxWithdraw(holder)).to.be.bignumber.equal('0');
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expect(await this.vault.previewWithdraw('0')).to.be.bignumber.equal('0');
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const { tx } = await this.vault.withdraw('0', recipient, holder, { from: holder });
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await expectEvent.inTransaction(tx, this.token, 'Transfer', {
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from: this.vault.address,
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to: recipient,
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value: '0',
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});
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await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
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from: holder,
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to: constants.ZERO_ADDRESS,
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value: '0',
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});
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await expectEvent.inTransaction(tx, this.vault, 'Withdraw', {
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sender: holder,
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receiver: recipient,
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owner: holder,
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assets: '0',
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shares: '0',
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});
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});
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it('redeem', async function () {
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expect(await this.vault.maxRedeem(holder)).to.be.bignumber.equal('0');
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expect(await this.vault.previewRedeem('0')).to.be.bignumber.equal('0');
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const { tx } = await this.vault.redeem('0', recipient, holder, { from: holder });
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await expectEvent.inTransaction(tx, this.token, 'Transfer', {
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from: this.vault.address,
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to: recipient,
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value: '0',
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});
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await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
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from: holder,
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to: constants.ZERO_ADDRESS,
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value: '0',
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});
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await expectEvent.inTransaction(tx, this.vault, 'Withdraw', {
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sender: holder,
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receiver: recipient,
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owner: holder,
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assets: '0',
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shares: '0',
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});
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});
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});
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|
describe('inflation attack: offset price by direct deposit of assets', function () {
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beforeEach(async function () {
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// Donate 1 token to the vault to offset the price
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await this.token.$_mint(this.vault.address, parseToken(1));
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});
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it('status', async function () {
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expect(await this.vault.totalSupply()).to.be.bignumber.equal('0');
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expect(await this.vault.totalAssets()).to.be.bignumber.equal(parseToken(1));
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});
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|
/**
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* | offset | deposited assets | redeemable assets |
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* |--------|----------------------|----------------------|
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* | 0 | 1.000000000000000000 | 0. |
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* | 6 | 1.000000000000000000 | 0.999999000000000000 |
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* | 18 | 1.000000000000000000 | 0.999999999999999999 |
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*
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* Attack is possible, but made difficult by the offset. For the attack to be successful
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* the attacker needs to frontrun a deposit 10**offset times bigger than what the victim
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* was trying to deposit
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*/
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it('deposit', async function () {
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const effectiveAssets = await this.vault.totalAssets().then(x => x.add(virtualAssets));
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const effectiveShares = await this.vault.totalSupply().then(x => x.add(virtualShares));
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const depositAssets = parseToken(1);
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const expectedShares = depositAssets.mul(effectiveShares).div(effectiveAssets);
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expect(await this.vault.maxDeposit(holder)).to.be.bignumber.equal(constants.MAX_UINT256);
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expect(await this.vault.previewDeposit(depositAssets)).to.be.bignumber.equal(expectedShares);
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const { tx } = await this.vault.deposit(depositAssets, recipient, { from: holder });
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await expectEvent.inTransaction(tx, this.token, 'Transfer', {
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from: holder,
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to: this.vault.address,
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value: depositAssets,
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});
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await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
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from: constants.ZERO_ADDRESS,
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to: recipient,
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value: expectedShares,
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});
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await expectEvent.inTransaction(tx, this.vault, 'Deposit', {
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sender: holder,
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owner: recipient,
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assets: depositAssets,
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shares: expectedShares,
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});
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});
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|
|
/**
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|
* | offset | deposited assets | redeemable assets |
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|
* |--------|----------------------|----------------------|
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|
* | 0 | 1000000000000000001. | 1000000000000000001. |
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* | 6 | 1000000000000000001. | 1000000000000000001. |
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* | 18 | 1000000000000000001. | 1000000000000000001. |
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*
|
|
* Using mint protects against inflation attack, but makes minting shares very expensive.
|
|
* The ER20 allowance for the underlying asset is needed to protect the user from (too)
|
|
* large deposits.
|
|
*/
|
|
it('mint', async function () {
|
|
const effectiveAssets = await this.vault.totalAssets().then(x => x.add(virtualAssets));
|
|
const effectiveShares = await this.vault.totalSupply().then(x => x.add(virtualShares));
|
|
|
|
const mintShares = parseShare(1);
|
|
const expectedAssets = mintShares.mul(effectiveAssets).div(effectiveShares);
|
|
|
|
expect(await this.vault.maxMint(holder)).to.be.bignumber.equal(constants.MAX_UINT256);
|
|
expect(await this.vault.previewMint(mintShares)).to.be.bignumber.equal(expectedAssets);
|
|
|
|
const { tx } = await this.vault.mint(mintShares, recipient, { from: holder });
|
|
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: holder,
|
|
to: this.vault.address,
|
|
value: expectedAssets,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: constants.ZERO_ADDRESS,
|
|
to: recipient,
|
|
value: mintShares,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Deposit', {
|
|
sender: holder,
|
|
owner: recipient,
|
|
assets: expectedAssets,
|
|
shares: mintShares,
|
|
});
|
|
});
|
|
|
|
it('withdraw', async function () {
|
|
expect(await this.vault.maxWithdraw(holder)).to.be.bignumber.equal('0');
|
|
expect(await this.vault.previewWithdraw('0')).to.be.bignumber.equal('0');
|
|
|
|
const { tx } = await this.vault.withdraw('0', recipient, holder, { from: holder });
|
|
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: recipient,
|
|
value: '0',
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: holder,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: '0',
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Withdraw', {
|
|
sender: holder,
|
|
receiver: recipient,
|
|
owner: holder,
|
|
assets: '0',
|
|
shares: '0',
|
|
});
|
|
});
|
|
|
|
it('redeem', async function () {
|
|
expect(await this.vault.maxRedeem(holder)).to.be.bignumber.equal('0');
|
|
expect(await this.vault.previewRedeem('0')).to.be.bignumber.equal('0');
|
|
|
|
const { tx } = await this.vault.redeem('0', recipient, holder, { from: holder });
|
|
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: recipient,
|
|
value: '0',
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: holder,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: '0',
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Withdraw', {
|
|
sender: holder,
|
|
receiver: recipient,
|
|
owner: holder,
|
|
assets: '0',
|
|
shares: '0',
|
|
});
|
|
});
|
|
});
|
|
|
|
describe('full vault: assets & shares', function () {
|
|
beforeEach(async function () {
|
|
// Add 1 token of underlying asset and 100 shares to the vault
|
|
await this.token.$_mint(this.vault.address, parseToken(1));
|
|
await this.vault.$_mint(holder, parseShare(100));
|
|
});
|
|
|
|
it('status', async function () {
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal(parseShare(100));
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal(parseToken(1));
|
|
});
|
|
|
|
/**
|
|
* | offset | deposited assets | redeemable assets |
|
|
* |--------|--------------------- |----------------------|
|
|
* | 0 | 1.000000000000000000 | 0.999999999999999999 |
|
|
* | 6 | 1.000000000000000000 | 0.999999999999999999 |
|
|
* | 18 | 1.000000000000000000 | 0.999999999999999999 |
|
|
*
|
|
* Virtual shares & assets captures part of the value
|
|
*/
|
|
it('deposit', async function () {
|
|
const effectiveAssets = await this.vault.totalAssets().then(x => x.add(virtualAssets));
|
|
const effectiveShares = await this.vault.totalSupply().then(x => x.add(virtualShares));
|
|
|
|
const depositAssets = parseToken(1);
|
|
const expectedShares = depositAssets.mul(effectiveShares).div(effectiveAssets);
|
|
|
|
expect(await this.vault.maxDeposit(holder)).to.be.bignumber.equal(constants.MAX_UINT256);
|
|
expect(await this.vault.previewDeposit(depositAssets)).to.be.bignumber.equal(expectedShares);
|
|
|
|
const { tx } = await this.vault.deposit(depositAssets, recipient, { from: holder });
|
|
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: holder,
|
|
to: this.vault.address,
|
|
value: depositAssets,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: constants.ZERO_ADDRESS,
|
|
to: recipient,
|
|
value: expectedShares,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Deposit', {
|
|
sender: holder,
|
|
owner: recipient,
|
|
assets: depositAssets,
|
|
shares: expectedShares,
|
|
});
|
|
});
|
|
|
|
/**
|
|
* | offset | deposited assets | redeemable assets |
|
|
* |--------|--------------------- |----------------------|
|
|
* | 0 | 0.010000000000000001 | 0.010000000000000000 |
|
|
* | 6 | 0.010000000000000001 | 0.010000000000000000 |
|
|
* | 18 | 0.010000000000000001 | 0.010000000000000000 |
|
|
*
|
|
* Virtual shares & assets captures part of the value
|
|
*/
|
|
it('mint', async function () {
|
|
const effectiveAssets = await this.vault.totalAssets().then(x => x.add(virtualAssets));
|
|
const effectiveShares = await this.vault.totalSupply().then(x => x.add(virtualShares));
|
|
|
|
const mintShares = parseShare(1);
|
|
const expectedAssets = mintShares.mul(effectiveAssets).div(effectiveShares).addn(1); // add for the rounding
|
|
|
|
expect(await this.vault.maxMint(holder)).to.be.bignumber.equal(constants.MAX_UINT256);
|
|
expect(await this.vault.previewMint(mintShares)).to.be.bignumber.equal(expectedAssets);
|
|
|
|
const { tx } = await this.vault.mint(mintShares, recipient, { from: holder });
|
|
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: holder,
|
|
to: this.vault.address,
|
|
value: expectedAssets,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: constants.ZERO_ADDRESS,
|
|
to: recipient,
|
|
value: mintShares,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Deposit', {
|
|
sender: holder,
|
|
owner: recipient,
|
|
assets: expectedAssets,
|
|
shares: mintShares,
|
|
});
|
|
});
|
|
|
|
it('withdraw', async function () {
|
|
const effectiveAssets = await this.vault.totalAssets().then(x => x.add(virtualAssets));
|
|
const effectiveShares = await this.vault.totalSupply().then(x => x.add(virtualShares));
|
|
|
|
const withdrawAssets = parseToken(1);
|
|
const expectedShares = withdrawAssets.mul(effectiveShares).div(effectiveAssets).addn(1); // add for the rounding
|
|
|
|
expect(await this.vault.maxWithdraw(holder)).to.be.bignumber.equal(withdrawAssets);
|
|
expect(await this.vault.previewWithdraw(withdrawAssets)).to.be.bignumber.equal(expectedShares);
|
|
|
|
const { tx } = await this.vault.withdraw(withdrawAssets, recipient, holder, { from: holder });
|
|
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: recipient,
|
|
value: withdrawAssets,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: holder,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: expectedShares,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Withdraw', {
|
|
sender: holder,
|
|
receiver: recipient,
|
|
owner: holder,
|
|
assets: withdrawAssets,
|
|
shares: expectedShares,
|
|
});
|
|
});
|
|
|
|
it('withdraw with approval', async function () {
|
|
const assets = await this.vault.previewWithdraw(parseToken(1));
|
|
await expectRevertCustomError(
|
|
this.vault.withdraw(parseToken(1), recipient, holder, { from: other }),
|
|
'ERC20InsufficientAllowance',
|
|
[other, 0, assets],
|
|
);
|
|
|
|
await this.vault.withdraw(parseToken(1), recipient, holder, { from: spender });
|
|
});
|
|
|
|
it('redeem', async function () {
|
|
const effectiveAssets = await this.vault.totalAssets().then(x => x.add(virtualAssets));
|
|
const effectiveShares = await this.vault.totalSupply().then(x => x.add(virtualShares));
|
|
|
|
const redeemShares = parseShare(100);
|
|
const expectedAssets = redeemShares.mul(effectiveAssets).div(effectiveShares);
|
|
|
|
expect(await this.vault.maxRedeem(holder)).to.be.bignumber.equal(redeemShares);
|
|
expect(await this.vault.previewRedeem(redeemShares)).to.be.bignumber.equal(expectedAssets);
|
|
|
|
const { tx } = await this.vault.redeem(redeemShares, recipient, holder, { from: holder });
|
|
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: recipient,
|
|
value: expectedAssets,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: holder,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: redeemShares,
|
|
});
|
|
|
|
await expectEvent.inTransaction(tx, this.vault, 'Withdraw', {
|
|
sender: holder,
|
|
receiver: recipient,
|
|
owner: holder,
|
|
assets: expectedAssets,
|
|
shares: redeemShares,
|
|
});
|
|
});
|
|
|
|
it('redeem with approval', async function () {
|
|
await expectRevertCustomError(
|
|
this.vault.redeem(parseShare(100), recipient, holder, { from: other }),
|
|
'ERC20InsufficientAllowance',
|
|
[other, 0, parseShare(100)],
|
|
);
|
|
|
|
await this.vault.redeem(parseShare(100), recipient, holder, { from: spender });
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
describe('ERC4626Fees', function () {
|
|
const feeBasePoint = web3.utils.toBN(5e3);
|
|
const amountWithoutFees = web3.utils.toBN(10000);
|
|
const fees = amountWithoutFees.mul(feeBasePoint).divn(1e5);
|
|
const amountWithFees = amountWithoutFees.add(fees);
|
|
|
|
describe('input fees', function () {
|
|
beforeEach(async function () {
|
|
this.token = await ERC20Decimals.new(name, symbol, 18);
|
|
this.vault = await ERC4626FeesMock.new(
|
|
name + ' Vault',
|
|
symbol + 'V',
|
|
this.token.address,
|
|
feeBasePoint,
|
|
other,
|
|
0,
|
|
constants.ZERO_ADDRESS,
|
|
);
|
|
|
|
await this.token.$_mint(holder, constants.MAX_INT256);
|
|
await this.token.approve(this.vault.address, constants.MAX_INT256, { from: holder });
|
|
});
|
|
|
|
it('deposit', async function () {
|
|
expect(await this.vault.previewDeposit(amountWithFees)).to.be.bignumber.equal(amountWithoutFees);
|
|
({ tx: this.tx } = await this.vault.deposit(amountWithFees, recipient, { from: holder }));
|
|
});
|
|
|
|
it('mint', async function () {
|
|
expect(await this.vault.previewMint(amountWithoutFees)).to.be.bignumber.equal(amountWithFees);
|
|
({ tx: this.tx } = await this.vault.mint(amountWithoutFees, recipient, { from: holder }));
|
|
});
|
|
|
|
afterEach(async function () {
|
|
// get total
|
|
await expectEvent.inTransaction(this.tx, this.token, 'Transfer', {
|
|
from: holder,
|
|
to: this.vault.address,
|
|
value: amountWithFees,
|
|
});
|
|
|
|
// redirect fees
|
|
await expectEvent.inTransaction(this.tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: other,
|
|
value: fees,
|
|
});
|
|
|
|
// mint shares
|
|
await expectEvent.inTransaction(this.tx, this.vault, 'Transfer', {
|
|
from: constants.ZERO_ADDRESS,
|
|
to: recipient,
|
|
value: amountWithoutFees,
|
|
});
|
|
|
|
// deposit event
|
|
await expectEvent.inTransaction(this.tx, this.vault, 'Deposit', {
|
|
sender: holder,
|
|
owner: recipient,
|
|
assets: amountWithFees,
|
|
shares: amountWithoutFees,
|
|
});
|
|
});
|
|
});
|
|
|
|
describe('output fees', function () {
|
|
beforeEach(async function () {
|
|
this.token = await ERC20Decimals.new(name, symbol, 18);
|
|
this.vault = await ERC4626FeesMock.new(
|
|
name + ' Vault',
|
|
symbol + 'V',
|
|
this.token.address,
|
|
0,
|
|
constants.ZERO_ADDRESS,
|
|
5e3, // 5%
|
|
other,
|
|
);
|
|
|
|
await this.token.$_mint(this.vault.address, constants.MAX_INT256);
|
|
await this.vault.$_mint(holder, constants.MAX_INT256);
|
|
});
|
|
|
|
it('redeem', async function () {
|
|
expect(await this.vault.previewRedeem(amountWithFees)).to.be.bignumber.equal(amountWithoutFees);
|
|
({ tx: this.tx } = await this.vault.redeem(amountWithFees, recipient, holder, { from: holder }));
|
|
});
|
|
|
|
it('withdraw', async function () {
|
|
expect(await this.vault.previewWithdraw(amountWithoutFees)).to.be.bignumber.equal(amountWithFees);
|
|
({ tx: this.tx } = await this.vault.withdraw(amountWithoutFees, recipient, holder, { from: holder }));
|
|
});
|
|
|
|
afterEach(async function () {
|
|
// withdraw principal
|
|
await expectEvent.inTransaction(this.tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: recipient,
|
|
value: amountWithoutFees,
|
|
});
|
|
|
|
// redirect fees
|
|
await expectEvent.inTransaction(this.tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: other,
|
|
value: fees,
|
|
});
|
|
|
|
// mint shares
|
|
await expectEvent.inTransaction(this.tx, this.vault, 'Transfer', {
|
|
from: holder,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: amountWithFees,
|
|
});
|
|
|
|
// withdraw event
|
|
await expectEvent.inTransaction(this.tx, this.vault, 'Withdraw', {
|
|
sender: holder,
|
|
receiver: recipient,
|
|
owner: holder,
|
|
assets: amountWithoutFees,
|
|
shares: amountWithFees,
|
|
});
|
|
});
|
|
});
|
|
});
|
|
|
|
/// Scenario inspired by solmate ERC4626 tests:
|
|
/// https://github.com/transmissions11/solmate/blob/main/src/test/ERC4626.t.sol
|
|
it('multiple mint, deposit, redeem & withdrawal', async function () {
|
|
// test designed with both asset using similar decimals
|
|
this.token = await ERC20Decimals.new(name, symbol, 18);
|
|
this.vault = await ERC4626.new(name + ' Vault', symbol + 'V', this.token.address);
|
|
|
|
await this.token.$_mint(user1, 4000);
|
|
await this.token.$_mint(user2, 7001);
|
|
await this.token.approve(this.vault.address, 4000, { from: user1 });
|
|
await this.token.approve(this.vault.address, 7001, { from: user2 });
|
|
|
|
// 1. Alice mints 2000 shares (costs 2000 tokens)
|
|
{
|
|
const { tx } = await this.vault.mint(2000, user1, { from: user1 });
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: user1,
|
|
to: this.vault.address,
|
|
value: '2000',
|
|
});
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: constants.ZERO_ADDRESS,
|
|
to: user1,
|
|
value: '2000',
|
|
});
|
|
|
|
expect(await this.vault.previewDeposit(2000)).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('0');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('0');
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'2000',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('2000');
|
|
}
|
|
|
|
// 2. Bob deposits 4000 tokens (mints 4000 shares)
|
|
{
|
|
const { tx } = await this.vault.mint(4000, user2, { from: user2 });
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: user2,
|
|
to: this.vault.address,
|
|
value: '4000',
|
|
});
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: constants.ZERO_ADDRESS,
|
|
to: user2,
|
|
value: '4000',
|
|
});
|
|
|
|
expect(await this.vault.previewDeposit(4000)).to.be.bignumber.equal('4000');
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4000');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('4000');
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'6000',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('6000');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('6000');
|
|
}
|
|
|
|
// 3. Vault mutates by +3000 tokens (simulated yield returned from strategy)
|
|
await this.token.$_mint(this.vault.address, 3000);
|
|
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4000');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('2999'); // used to be 3000, but virtual assets/shares captures part of the yield
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('5999'); // used to be 6000, but virtual assets/shares captures part of the yield
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'6000',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('6000');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('9000');
|
|
|
|
// 4. Alice deposits 2000 tokens (mints 1333 shares)
|
|
{
|
|
const { tx } = await this.vault.deposit(2000, user1, { from: user1 });
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: user1,
|
|
to: this.vault.address,
|
|
value: '2000',
|
|
});
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: constants.ZERO_ADDRESS,
|
|
to: user1,
|
|
value: '1333',
|
|
});
|
|
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('3333');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4000');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('4999');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('6000');
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'7333',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('7333');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('11000');
|
|
}
|
|
|
|
// 5. Bob mints 2000 shares (costs 3001 assets)
|
|
// NOTE: Bob's assets spent got rounded up
|
|
// NOTE: Alices's vault assets got rounded up
|
|
{
|
|
const { tx } = await this.vault.mint(2000, user2, { from: user2 });
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: user2,
|
|
to: this.vault.address,
|
|
value: '3000', // used to be 3001
|
|
});
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: constants.ZERO_ADDRESS,
|
|
to: user2,
|
|
value: '2000',
|
|
});
|
|
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('3333');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('6000');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('4999'); // used to be 5000
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('9000');
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'9333',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('9333');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('14000'); // used to be 14001
|
|
}
|
|
|
|
// 6. Vault mutates by +3000 tokens
|
|
// NOTE: Vault holds 17001 tokens, but sum of assetsOf() is 17000.
|
|
await this.token.$_mint(this.vault.address, 3000);
|
|
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('3333');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('6000');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('6070'); // used to be 6071
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('10928'); // used to be 10929
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'9333',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('9333');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('17000'); // used to be 17001
|
|
|
|
// 7. Alice redeem 1333 shares (2428 assets)
|
|
{
|
|
const { tx } = await this.vault.redeem(1333, user1, user1, { from: user1 });
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: user1,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: '1333',
|
|
});
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: user1,
|
|
value: '2427', // used to be 2428
|
|
});
|
|
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('6000');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('3643');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('10929');
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'8000',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('8000');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('14573');
|
|
}
|
|
|
|
// 8. Bob withdraws 2929 assets (1608 shares)
|
|
{
|
|
const { tx } = await this.vault.withdraw(2929, user2, user2, { from: user2 });
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: user2,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: '1608',
|
|
});
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: user2,
|
|
value: '2929',
|
|
});
|
|
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('2000');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4392');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('3643');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('8000');
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'6392',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('6392');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('11644');
|
|
}
|
|
|
|
// 9. Alice withdraws 3643 assets (2000 shares)
|
|
// NOTE: Bob's assets have been rounded back up
|
|
{
|
|
const { tx } = await this.vault.withdraw(3643, user1, user1, { from: user1 });
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: user1,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: '2000',
|
|
});
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: user1,
|
|
value: '3643',
|
|
});
|
|
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('0');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('4392');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('0');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('8000'); // used to be 8001
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'4392',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('4392');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('8001');
|
|
}
|
|
|
|
// 10. Bob redeem 4392 shares (8001 tokens)
|
|
{
|
|
const { tx } = await this.vault.redeem(4392, user2, user2, { from: user2 });
|
|
await expectEvent.inTransaction(tx, this.vault, 'Transfer', {
|
|
from: user2,
|
|
to: constants.ZERO_ADDRESS,
|
|
value: '4392',
|
|
});
|
|
await expectEvent.inTransaction(tx, this.token, 'Transfer', {
|
|
from: this.vault.address,
|
|
to: user2,
|
|
value: '8000', // used to be 8001
|
|
});
|
|
|
|
expect(await this.vault.balanceOf(user1)).to.be.bignumber.equal('0');
|
|
expect(await this.vault.balanceOf(user2)).to.be.bignumber.equal('0');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user1))).to.be.bignumber.equal('0');
|
|
expect(await this.vault.convertToAssets(await this.vault.balanceOf(user2))).to.be.bignumber.equal('0');
|
|
expect(await this.vault.convertToShares(await this.token.balanceOf(this.vault.address))).to.be.bignumber.equal(
|
|
'0',
|
|
);
|
|
expect(await this.vault.totalSupply()).to.be.bignumber.equal('0');
|
|
expect(await this.vault.totalAssets()).to.be.bignumber.equal('1'); // used to be 0
|
|
}
|
|
});
|
|
});
|
|
|