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import { ZeroEx } from '0x.js';
import { BigNumber } from '@0xproject/utils';
import * as chai from 'chai';
import ethUtil = require('ethereumjs-util');
import { Artifacts } from '../../../util/artifacts';
import { ExchangeWrapper } from '../../../util/exchange_wrapper';
import { Order } from '../../../util/order';
import { OrderFactory } from '../../../util/order_factory';
import { chaiSetup } from '../utils/chai_setup';
chaiSetup.configure();
const expect = chai.expect;
const { Exchange, TokenRegistry } = new Artifacts(artifacts);
contract('Exchange', (accounts: string[]) => {
const maker = accounts[0];
const feeRecipient = accounts[1] || accounts[accounts.length - 1];
let order: Order;
let exchangeWrapper: ExchangeWrapper;
let orderFactory: OrderFactory;
before(async () => {
const [tokenRegistry, exchange] = await Promise.all([TokenRegistry.deployed(), Exchange.deployed()]);
exchangeWrapper = new ExchangeWrapper(exchange);
const [repAddress, dgdAddress] = await Promise.all([
tokenRegistry.getTokenAddressBySymbol('REP'),
tokenRegistry.getTokenAddressBySymbol('DGD'),
]);
const defaultOrderParams = {
exchangeContractAddress: Exchange.address,
maker,
feeRecipient,
makerToken: repAddress,
takerToken: dgdAddress,
makerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
takerTokenAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
makerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
takerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
};
orderFactory = new OrderFactory(defaultOrderParams);
});
beforeEach(async () => {
order = await orderFactory.newSignedOrderAsync();
});
describe('getOrderHash', () => {
it('should output the correct orderHash', async () => {
const orderHashHex = await exchangeWrapper.getOrderHashAsync(order);
expect(order.params.orderHashHex).to.be.equal(orderHashHex);
});
});
describe('isValidSignature', () => {
beforeEach(async () => {
order = await orderFactory.newSignedOrderAsync();
});
it('should return true with a valid signature', async () => {
const success = await exchangeWrapper.isValidSignatureAsync(order);
const isValidSignature = order.isValidSignature();
expect(isValidSignature).to.be.true();
expect(success).to.be.true();
});
it('should return false with an invalid signature', async () => {
order.params.r = ethUtil.bufferToHex(ethUtil.sha3('invalidR'));
order.params.s = ethUtil.bufferToHex(ethUtil.sha3('invalidS'));
const success = await exchangeWrapper.isValidSignatureAsync(order);
expect(order.isValidSignature()).to.be.false();
expect(success).to.be.false();
});
});
describe('isRoundingError', () => {
it('should return false if there is a rounding error of 0.1%', async () => {
const numerator = new BigNumber(20);
const denominator = new BigNumber(999);
const target = new BigNumber(50);
// rounding error = ((20*50/999) - floor(20*50/999)) / (20*50/999) = 0.1%
const isRoundingError = await exchangeWrapper.isRoundingErrorAsync(numerator, denominator, target);
expect(isRoundingError).to.be.false();
});
it('should return false if there is a rounding of 0.09%', async () => {
const numerator = new BigNumber(20);
const denominator = new BigNumber(9991);
const target = new BigNumber(500);
// rounding error = ((20*500/9991) - floor(20*500/9991)) / (20*500/9991) = 0.09%
const isRoundingError = await exchangeWrapper.isRoundingErrorAsync(numerator, denominator, target);
expect(isRoundingError).to.be.false();
});
it('should return true if there is a rounding error of 0.11%', async () => {
const numerator = new BigNumber(20);
const denominator = new BigNumber(9989);
const target = new BigNumber(500);
// rounding error = ((20*500/9989) - floor(20*500/9989)) / (20*500/9989) = 0.011%
const isRoundingError = await exchangeWrapper.isRoundingErrorAsync(numerator, denominator, target);
expect(isRoundingError).to.be.true();
});
it('should return true if there is a rounding error > 0.1%', async () => {
const numerator = new BigNumber(3);
const denominator = new BigNumber(7);
const target = new BigNumber(10);
// rounding error = ((3*10/7) - floor(3*10/7)) / (3*10/7) = 6.67%
const isRoundingError = await exchangeWrapper.isRoundingErrorAsync(numerator, denominator, target);
expect(isRoundingError).to.be.true();
});
it('should return false when there is no rounding error', async () => {
const numerator = new BigNumber(1);
const denominator = new BigNumber(2);
const target = new BigNumber(10);
const isRoundingError = await exchangeWrapper.isRoundingErrorAsync(numerator, denominator, target);
expect(isRoundingError).to.be.false();
});
it('should return false when there is rounding error <= 0.1%', async () => {
// randomly generated numbers
const numerator = new BigNumber(76564);
const denominator = new BigNumber(676373677);
const target = new BigNumber(105762562);
// rounding error = ((76564*105762562/676373677) - floor(76564*105762562/676373677)) /
// (76564*105762562/676373677) = 0.0007%
const isRoundingError = await exchangeWrapper.isRoundingErrorAsync(numerator, denominator, target);
expect(isRoundingError).to.be.false();
});
});
describe('getPartialAmount', () => {
it('should return the numerator/denominator*target', async () => {
const numerator = new BigNumber(1);
const denominator = new BigNumber(2);
const target = new BigNumber(10);
const partialAmount = await exchangeWrapper.getPartialAmountAsync(numerator, denominator, target);
const expectedPartialAmount = 5;
expect(partialAmount).to.be.bignumber.equal(expectedPartialAmount);
});
it('should round down', async () => {
const numerator = new BigNumber(2);
const denominator = new BigNumber(3);
const target = new BigNumber(10);
const partialAmount = await exchangeWrapper.getPartialAmountAsync(numerator, denominator, target);
const expectedPartialAmount = 6;
expect(partialAmount).to.be.bignumber.equal(expectedPartialAmount);
});
it('should round .5 down', async () => {
const numerator = new BigNumber(1);
const denominator = new BigNumber(20);
const target = new BigNumber(10);
const partialAmount = await exchangeWrapper.getPartialAmountAsync(numerator, denominator, target);
const expectedPartialAmount = 0;
expect(partialAmount).to.be.bignumber.equal(expectedPartialAmount);
});
});
});
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