1 files changed, 154 insertions, 0 deletions
diff --git a/packages/contracts/test/exchange/libs.ts b/packages/contracts/test/exchange/libs.ts
new file mode 100644
index 000000000..1036cb815
--- /dev/null
+++ b/packages/contracts/test/exchange/libs.ts
@@ -0,0 +1,154 @@
+import { ZeroEx } from '0x.js';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
+import { BigNumber } from '@0xproject/utils';
+import * as chai from 'chai';
+import ethUtil = require('ethereumjs-util');
+
+import { TestLibsContract } from '../../src/contract_wrappers/generated/test_libs';
+import { addressUtils } from '../../src/utils/address_utils';
+import { artifacts } from '../../src/utils/artifacts';
+import { assetProxyUtils } from '../../src/utils/asset_proxy_utils';
+import { chaiSetup } from '../../src/utils/chai_setup';
+import { constants } from '../../src/utils/constants';
+import { OrderFactory } from '../../src/utils/order_factory';
+import { orderUtils } from '../../src/utils/order_utils';
+import { SignedOrder } from '../../src/utils/types';
+import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
+
+describe('Exchange libs', () => {
+    let signedOrder: SignedOrder;
+    let orderFactory: OrderFactory;
+    let libs: TestLibsContract;
+
+    before(async () => {
+        const accounts = await web3Wrapper.getAvailableAddressesAsync();
+        const makerAddress = accounts[0];
+        libs = await TestLibsContract.deployFrom0xArtifactAsync(artifacts.TestLibs, provider, txDefaults);
+        const zeroEx = new ZeroEx(provider, { networkId: constants.TESTRPC_NETWORK_ID });
+
+        const defaultOrderParams = {
+            ...constants.STATIC_ORDER_PARAMS,
+            exchangeAddress: libs.address,
+            makerAddress,
+            feeRecipientAddress: addressUtils.generatePseudoRandomAddress(),
+            makerAssetData: assetProxyUtils.encodeERC20ProxyData(addressUtils.generatePseudoRandomAddress()),
+            takerAssetData: assetProxyUtils.encodeERC20ProxyData(addressUtils.generatePseudoRandomAddress()),
+        };
+        const privateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(makerAddress)];
+        orderFactory = new OrderFactory(privateKey, defaultOrderParams);
+    });
+
+    beforeEach(async () => {
+        await blockchainLifecycle.startAsync();
+        signedOrder = orderFactory.newSignedOrder();
+    });
+    afterEach(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+
+    describe('LibOrder', () => {
+        describe('getOrderHash', () => {
+            it('should output the correct orderHash', async () => {
+                const orderHashHex = await libs.publicGetOrderHash.callAsync(signedOrder);
+                expect(orderUtils.getOrderHashHex(signedOrder)).to.be.equal(orderHashHex);
+            });
+        });
+    });
+
+    describe('LibMath', () => {
+        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 libs.publicIsRoundingError.callAsync(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 libs.publicIsRoundingError.callAsync(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 libs.publicIsRoundingError.callAsync(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 libs.publicIsRoundingError.callAsync(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 libs.publicIsRoundingError.callAsync(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 libs.publicIsRoundingError.callAsync(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 libs.publicGetPartialAmount.callAsync(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 libs.publicGetPartialAmount.callAsync(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 libs.publicGetPartialAmount.callAsync(numerator, denominator, target);
+                const expectedPartialAmount = 0;
+                expect(partialAmount).to.be.bignumber.equal(expectedPartialAmount);
+            });
+        });
+    });
+});