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author | Brandon Millman <brandon.millman@gmail.com> | 2018-10-04 04:23:48 +0800 |
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committer | Brandon Millman <brandon.millman@gmail.com> | 2018-10-04 05:51:24 +0800 |
commit | 57b4396193b731d97f73f4e3648a8dbdc1f589ac (patch) | |
tree | 43bc84a69dab3b8d37a2cce345bbf5f52911a334 /packages/asset-buyer/test/buy_quote_calculator_test.ts | |
parent | a21cf0ad830f7232e6323a99ad81f89e0886d0ba (diff) | |
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Add buy_quote_calculator_test
Diffstat (limited to 'packages/asset-buyer/test/buy_quote_calculator_test.ts')
-rw-r--r-- | packages/asset-buyer/test/buy_quote_calculator_test.ts | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/packages/asset-buyer/test/buy_quote_calculator_test.ts b/packages/asset-buyer/test/buy_quote_calculator_test.ts new file mode 100644 index 000000000..2cad1ab05 --- /dev/null +++ b/packages/asset-buyer/test/buy_quote_calculator_test.ts @@ -0,0 +1,130 @@ +import { orderFactory } from '@0xproject/order-utils/lib/src/order_factory'; +import { BigNumber } from '@0xproject/utils'; +import * as chai from 'chai'; +import * as _ from 'lodash'; +import 'mocha'; + +import { AssetBuyerError, OrdersAndFillableAmounts } from '../src/types'; +import { buyQuoteCalculator } from '../src/utils/buy_quote_calculator'; + +import { chaiSetup } from './utils/chai_setup'; + +chaiSetup.configure(); +const expect = chai.expect; + +const NULL_ADDRESS = '0x0000000000000000000000000000000000000000'; +const NULL_BYTES = '0x'; + +// tslint:disable:custom-no-magic-numbers +describe('buyQuoteCalculator', () => { + describe('#calculate', () => { + let ordersAndFillableAmounts: OrdersAndFillableAmounts; + let feeOrdersAndFillableAmounts: OrdersAndFillableAmounts; + beforeEach(() => { + // generate two orders for our desired maker asset + // the first order has a rate of 4 makerAsset / WETH with a takerFee of 200 ZRX and has only 200 / 400 makerAsset units left to fill (half fillable) + // the second order has a rate of 2 makerAsset / WETH with a takerFee of 100 ZRX and has 200 / 200 makerAsset units left to fill (completely fillable) + // generate one order for fees + // the fee order has a rate of 1 ZRX / WETH with no taker fee and has 100 ZRX left to fill (completely fillable) + const firstOrder = orderFactory.createOrder( + NULL_ADDRESS, + new BigNumber(400), + NULL_BYTES, + new BigNumber(100), + NULL_BYTES, + NULL_ADDRESS, + { + takerFee: new BigNumber(200), + }, + ); + const firstRemainingFillAmount = new BigNumber(200); + const secondOrder = orderFactory.createOrder( + NULL_ADDRESS, + new BigNumber(200), + NULL_BYTES, + new BigNumber(100), + NULL_BYTES, + NULL_ADDRESS, + { + takerFee: new BigNumber(100), + }, + ); + const secondRemainingFillAmount = secondOrder.makerAssetAmount; + const signedOrders = _.map([firstOrder, secondOrder], order => { + return { + ...order, + signature: NULL_BYTES, + }; + }); + ordersAndFillableAmounts = { + orders: signedOrders, + remainingFillableMakerAssetAmounts: [firstRemainingFillAmount, secondRemainingFillAmount], + }; + const feeOrder = orderFactory.createOrder( + NULL_ADDRESS, + new BigNumber(100), + NULL_BYTES, + new BigNumber(100), + NULL_BYTES, + NULL_ADDRESS, + ); + const signedFeeOrder = { + ...feeOrder, + signature: NULL_BYTES, + }; + feeOrdersAndFillableAmounts = { + orders: [signedFeeOrder], + remainingFillableMakerAssetAmounts: [signedFeeOrder.makerAssetAmount], + }; + }); + it('should throw if not enough maker asset liquidity', () => { + // we have 400 makerAsset units available to fill but attempt to calculate a quote for 500 makerAsset units + expect(() => + buyQuoteCalculator.calculate( + ordersAndFillableAmounts, + feeOrdersAndFillableAmounts, + new BigNumber(500), + 0, + 0, + ), + ).to.throw(AssetBuyerError.InsufficientAssetLiquidity); + }); + it('should throw if not enough ZRX liquidity', () => { + // we request 300 makerAsset units but the ZRX order is only enough to fill the first order, which only has 200 makerAssetUnits available + expect(() => + buyQuoteCalculator.calculate( + ordersAndFillableAmounts, + feeOrdersAndFillableAmounts, + new BigNumber(300), + 0, + 0, + ), + ).to.throw(AssetBuyerError.InsufficientZrxLiquidity); + }); + it('calculates a correct buyQuote', () => { + // we request 200 makerAsset units which can be filled using the first order + // the first order requires a fee of 100 ZRX from the taker which can be filled by the feeOrder + const assetBuyAmount = new BigNumber(200); + const feePercentage = 0.02; + const slippagePercentage = 0; + const buyQuote = buyQuoteCalculator.calculate( + ordersAndFillableAmounts, + feeOrdersAndFillableAmounts, + assetBuyAmount, + feePercentage, + slippagePercentage, + ); + // test if orders are correct + expect(buyQuote.orders).to.deep.equal([ordersAndFillableAmounts.orders[0]]); + expect(buyQuote.feeOrders).to.deep.equal([feeOrdersAndFillableAmounts.orders[0]]); + // test if rates are correct + const expectedMinEthToFill = new BigNumber(150); + const expectedMinRate = assetBuyAmount.div(expectedMinEthToFill.mul(feePercentage + 1)); + expect(buyQuote.minRate).to.bignumber.equal(expectedMinRate); + // because we have no slippage protection, minRate is equal to maxRate + expect(buyQuote.maxRate).to.bignumber.equal(expectedMinRate); + // test if feePercentage gets passed through + expect(buyQuote.feePercentage).to.equal(feePercentage); + }); + }); +}); |