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import { BigNumber } from '@0xproject/utils';
import * as chai from 'chai';
import 'mocha';
import { rateUtils } from '../src';
import { chaiSetup } from './utils/chai_setup';
import { testOrderFactory } from './utils/test_order_factory';
chaiSetup.configure();
const expect = chai.expect;
describe('rateUtils', () => {
const testOrder = testOrderFactory.generateTestSignedOrder({
makerAssetAmount: new BigNumber(100),
takerAssetAmount: new BigNumber(100),
takerFee: new BigNumber(20),
});
describe('#getFeeAdjustedRateOfOrder', () => {
it('throws when feeRate is less than zero', async () => {
const feeRate = new BigNumber(-1);
expect(() => rateUtils.getFeeAdjustedRateOfOrder(testOrder, feeRate)).to.throw(
'Expected feeRate: -1 to be greater than or equal to 0',
);
});
it('correctly calculates fee adjusted rate when feeRate is provided', async () => {
const feeRate = new BigNumber(2); // ZRX costs 2 units of takerAsset per 1 unit of ZRX
const feeAdjustedRate = rateUtils.getFeeAdjustedRateOfOrder(testOrder, feeRate);
// the order actually takes 100 + (2 * 20) takerAsset units to fill 100 units of makerAsset
expect(feeAdjustedRate).to.bignumber.equal(new BigNumber(1.4));
});
it('correctly calculates fee adjusted rate when no feeRate is provided', async () => {
const feeAdjustedRate = rateUtils.getFeeAdjustedRateOfOrder(testOrder);
// because no feeRate was provided we just assume 0 fees
// the order actually takes 100 takerAsset units to fill 100 units of makerAsset
expect(feeAdjustedRate).to.bignumber.equal(new BigNumber(1));
});
});
describe('#getFeeAdjustedRateOfFeeOrder', () => {
it('throws when takerFee exceeds makerAssetAmount', async () => {
const badOrder = testOrderFactory.generateTestSignedOrder({
makerAssetAmount: new BigNumber(100),
takerFee: new BigNumber(101),
});
expect(() => rateUtils.getFeeAdjustedRateOfFeeOrder(badOrder)).to.throw(
'Expected takerFee: "101" to be less than makerAssetAmount: "100"',
);
});
it('correctly calculates fee adjusted rate', async () => {
const feeAdjustedRate = rateUtils.getFeeAdjustedRateOfFeeOrder(testOrder);
// the order actually takes 100 takerAsset units to fill (100 - 20) units of makerAsset
expect(feeAdjustedRate).to.bignumber.equal(new BigNumber(1.25));
});
});
});
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