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); }); }); });