Merge pull request #609 from 0xProject/refactor/contracts/remove0xjsDep

Remove 0x.js dep from Contracts

7 files changed, 136 insertions, 166 deletions

diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index 2c7a60c4e..f1d9a4156 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -1,6 +1,7 @@
-import { LogWithDecodedArgs, ZeroEx } from '0x.js';
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
+import { LogWithDecodedArgs } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
 import 'make-promises-safe';
@@ -59,8 +60,6 @@ describe('Exchange core', () => {
     let defaultMakerAssetAddress: string;
     let defaultTakerAssetAddress: string;
 
-    let zeroEx: ZeroEx;
-
     before(async () => {
         await blockchainLifecycle.startAsync();
     });
@@ -91,11 +90,7 @@ describe('Exchange core', () => {
             txDefaults,
             assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
         );
-        zeroEx = new ZeroEx(provider, {
-            exchangeContractAddress: exchange.address,
-            networkId: constants.TESTRPC_NETWORK_ID,
-        });
-        exchangeWrapper = new ExchangeWrapper(exchange, zeroEx);
+        exchangeWrapper = new ExchangeWrapper(exchange, provider);
         await exchangeWrapper.registerAssetProxyAsync(AssetProxyId.ERC20, erc20Proxy.address, owner);
         await exchangeWrapper.registerAssetProxyAsync(AssetProxyId.ERC721, erc721Proxy.address, owner);
 
@@ -178,8 +173,8 @@ describe('Exchange core', () => {
 
         it('should transfer the correct amounts when makerAssetAmount === takerAssetAmount', async () => {
             signedOrder = orderFactory.newSignedOrder({
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
             });
 
             const takerAssetFilledAmountBefore = await exchangeWrapper.getTakerAssetFilledAmountAsync(
@@ -231,8 +226,8 @@ describe('Exchange core', () => {
 
         it('should transfer the correct amounts when makerAssetAmount > takerAssetAmount', async () => {
             signedOrder = orderFactory.newSignedOrder({
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
             });
 
             const takerAssetFilledAmountBefore = await exchangeWrapper.getTakerAssetFilledAmountAsync(
@@ -284,8 +279,8 @@ describe('Exchange core', () => {
 
         it('should transfer the correct amounts when makerAssetAmount < takerAssetAmount', async () => {
             signedOrder = orderFactory.newSignedOrder({
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
 
             const takerAssetFilledAmountBefore = await exchangeWrapper.getTakerAssetFilledAmountAsync(
@@ -338,8 +333,8 @@ describe('Exchange core', () => {
         it('should transfer the correct amounts when taker is specified and order is claimed by taker', async () => {
             signedOrder = orderFactory.newSignedOrder({
                 takerAddress,
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
 
             const takerAssetFilledAmountBefore = await exchangeWrapper.getTakerAssetFilledAmountAsync(
@@ -457,8 +452,8 @@ describe('Exchange core', () => {
         it('should throw when taker is specified and order is claimed by other', async () => {
             signedOrder = orderFactory.newSignedOrder({
                 takerAddress: feeRecipientAddress,
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
             return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
                 constants.REVERT,
@@ -467,7 +462,7 @@ describe('Exchange core', () => {
 
         it('should throw if signature is invalid', async () => {
             signedOrder = orderFactory.newSignedOrder({
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
             });
 
             const invalidR = ethUtil.sha3('invalidR');
@@ -513,7 +508,7 @@ describe('Exchange core', () => {
 
         it('should throw if maker erc20Balances are too low to fill order', async () => {
             signedOrder = orderFactory.newSignedOrder({
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
             return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
@@ -523,7 +518,7 @@ describe('Exchange core', () => {
 
         it('should throw if taker erc20Balances are too low to fill order', async () => {
             signedOrder = orderFactory.newSignedOrder({
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
             return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
@@ -715,23 +710,23 @@ describe('Exchange core', () => {
             erc20Balances = await erc20Wrapper.getBalancesAsync();
             const signedOrders = await Promise.all([
                 orderFactory.newSignedOrder({
-                    makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(9), 18),
-                    takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(9), 18),
+                    makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(9), 18),
+                    takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(9), 18),
                     salt: new BigNumber(0),
                 }),
                 orderFactory.newSignedOrder({
-                    makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(79), 18),
-                    takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(79), 18),
+                    makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(79), 18),
+                    takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(79), 18),
                     salt: new BigNumber(1),
                 }),
                 orderFactory.newSignedOrder({
-                    makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(979), 18),
-                    takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(979), 18),
+                    makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(979), 18),
+                    takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(979), 18),
                     salt: new BigNumber(2),
                 }),
                 orderFactory.newSignedOrder({
-                    makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(7979), 18),
-                    takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(7979), 18),
+                    makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(7979), 18),
+                    takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(7979), 18),
                     salt: new BigNumber(3),
                 }),
             ]);
@@ -907,7 +902,7 @@ describe('Exchange core', () => {
             const makerAssetId = erc721MakerAssetIds[0];
             signedOrder = orderFactory.newSignedOrder({
                 makerAssetAmount: new BigNumber(1),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 makerAssetData: assetProxyUtils.encodeERC721ProxyData(erc721Token.address, makerAssetId),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultTakerAssetAddress),
             });
@@ -947,7 +942,7 @@ describe('Exchange core', () => {
             const takerAssetId = erc721TakerAssetIds[0];
             signedOrder = orderFactory.newSignedOrder({
                 takerAssetAmount: new BigNumber(1),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 takerAssetData: assetProxyUtils.encodeERC721ProxyData(erc721Token.address, takerAssetId),
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultMakerAssetAddress),
             });
diff --git a/packages/contracts/test/exchange/dispatcher.ts b/packages/contracts/test/exchange/dispatcher.ts
index a1c37d8c8..a2238bd10 100644
--- a/packages/contracts/test/exchange/dispatcher.ts
+++ b/packages/contracts/test/exchange/dispatcher.ts
@@ -1,4 +1,3 @@
-import { ZeroEx } from '0x.js';
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
@@ -83,7 +82,7 @@ describe('AssetProxyDispatcher', () => {
     });
     describe('registerAssetProxy', () => {
         it('should record proxy upon registration', async () => {
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
@@ -99,7 +98,7 @@ describe('AssetProxyDispatcher', () => {
 
         it('should be able to record multiple proxies', async () => {
             // Record first proxy
-            const prevERC20ProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevERC20ProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
@@ -112,7 +111,7 @@ describe('AssetProxyDispatcher', () => {
             let proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(proxyAddress).to.be.equal(erc20Proxy.address);
             // Record another proxy
-            const prevERC721ProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevERC721ProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC721,
@@ -128,7 +127,7 @@ describe('AssetProxyDispatcher', () => {
 
         it('should replace proxy address upon re-registration', async () => {
             // Initial registration
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
@@ -165,7 +164,7 @@ describe('AssetProxyDispatcher', () => {
 
         it('should throw if registering with incorrect "currentAssetProxyAddress" field', async () => {
             // Initial registration
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
@@ -177,12 +176,12 @@ describe('AssetProxyDispatcher', () => {
             );
             const proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(proxyAddress).to.be.equal(erc20Proxy.address);
-            // The following transaction will throw because the currentAddress is no longer ZeroEx.NULL_ADDRESS
+            // The following transaction will throw because the currentAddress is no longer constants.NULL_ADDRESS
             return expect(
                 assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
                     erc20Proxy.address,
-                    ZeroEx.NULL_ADDRESS,
+                    constants.NULL_ADDRESS,
                     { from: owner },
                 ),
             ).to.be.rejectedWith(constants.REVERT);
@@ -190,7 +189,7 @@ describe('AssetProxyDispatcher', () => {
 
         it('should be able to reset proxy address to NULL', async () => {
             // Initial registration
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
@@ -203,7 +202,7 @@ describe('AssetProxyDispatcher', () => {
             const proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(proxyAddress).to.be.equal(erc20Proxy.address);
             // The following transaction will reset the proxy address
-            const newProxyAddress = ZeroEx.NULL_ADDRESS;
+            const newProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
@@ -218,7 +217,7 @@ describe('AssetProxyDispatcher', () => {
         });
 
         it('should throw if requesting address is not owner', async () => {
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevProxyAddress = constants.NULL_ADDRESS;
             return expect(
                 assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
@@ -230,7 +229,7 @@ describe('AssetProxyDispatcher', () => {
         });
 
         it('should throw if attempting to register a proxy to the incorrect id', async () => {
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevProxyAddress = constants.NULL_ADDRESS;
             return expect(
                 assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC721,
@@ -244,7 +243,7 @@ describe('AssetProxyDispatcher', () => {
 
     describe('getAssetProxy', () => {
         it('should return correct address of registered proxy', async () => {
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
@@ -260,14 +259,14 @@ describe('AssetProxyDispatcher', () => {
 
         it('should return NULL address if requesting non-existent proxy', async () => {
             const proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
-            expect(proxyAddress).to.be.equal(ZeroEx.NULL_ADDRESS);
+            expect(proxyAddress).to.be.equal(constants.NULL_ADDRESS);
         });
     });
 
     describe('dispatchTransferFrom', () => {
         it('should dispatch transfer to registered proxy', async () => {
             // Register ERC20 proxy
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
+            const prevProxyAddress = constants.NULL_ADDRESS;
             await web3Wrapper.awaitTransactionMinedAsync(
                 await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
diff --git a/packages/contracts/test/exchange/libs.ts b/packages/contracts/test/exchange/libs.ts
index 883de7a12..5c530a9b1 100644
--- a/packages/contracts/test/exchange/libs.ts
+++ b/packages/contracts/test/exchange/libs.ts
@@ -1,4 +1,3 @@
-import { ZeroEx } from '0x.js';
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
@@ -35,7 +34,6 @@ describe('Exchange libs', () => {
         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,
diff --git a/packages/contracts/test/exchange/match_orders.ts b/packages/contracts/test/exchange/match_orders.ts
index b08b9e763..e732c90db 100644
--- a/packages/contracts/test/exchange/match_orders.ts
+++ b/packages/contracts/test/exchange/match_orders.ts
@@ -1,6 +1,7 @@
-import { LogWithDecodedArgs, ZeroEx } from '0x.js';
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
+import { LogWithDecodedArgs } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
@@ -76,8 +77,6 @@ describe('matchOrders', () => {
 
     let matchOrderTester: MatchOrderTester;
 
-    let zeroEx: ZeroEx;
-
     before(async () => {
         await blockchainLifecycle.startAsync();
     });
@@ -117,11 +116,7 @@ describe('matchOrders', () => {
             txDefaults,
             assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
         );
-        zeroEx = new ZeroEx(provider, {
-            exchangeContractAddress: exchange.address,
-            networkId: constants.TESTRPC_NETWORK_ID,
-        });
-        exchangeWrapper = new ExchangeWrapper(exchange, zeroEx);
+        exchangeWrapper = new ExchangeWrapper(exchange, provider);
         await exchangeWrapper.registerAssetProxyAsync(AssetProxyId.ERC20, erc20Proxy.address, owner);
         await exchangeWrapper.registerAssetProxyAsync(AssetProxyId.ERC721, erc721Proxy.address, owner);
         // Authorize ERC20 and ERC721 trades by exchange
@@ -173,16 +168,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match signedOrderLeft with signedOrderRight
@@ -207,16 +202,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Store original taker balance
@@ -252,16 +247,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(20), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(4), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(20), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(4), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -286,16 +281,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(50), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -320,16 +315,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(50), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -359,8 +354,8 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(50), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match signedOrderLeft with signedOrderRight2
@@ -389,8 +384,8 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
 
@@ -398,8 +393,8 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(50), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -429,8 +424,8 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(50), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             // Match signedOrderLeft2 with signedOrderRight
@@ -462,16 +457,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress,
             });
             // Match orders
@@ -490,16 +485,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -519,16 +514,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -548,16 +543,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -577,16 +572,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -606,16 +601,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: makerAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: makerAddressRight,
             });
             // Match orders
@@ -634,16 +629,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Cancel left order
@@ -660,16 +655,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Cancel right order
@@ -686,16 +681,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -716,16 +711,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -746,16 +741,16 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(2), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
@@ -778,14 +773,14 @@ describe('matchOrders', () => {
                 makerAssetData: assetProxyUtils.encodeERC721ProxyData(defaultERC721AssetAddress, erc721TokenToTransfer),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 makerAssetAmount: new BigNumber(1),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
             const signedOrderRight = orderFactoryRight.newSignedOrder({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC721ProxyData(defaultERC721AssetAddress, erc721TokenToTransfer),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 takerAssetAmount: new BigNumber(1),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
@@ -812,7 +807,7 @@ describe('matchOrders', () => {
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC721ProxyData(defaultERC721AssetAddress, erc721TokenToTransfer),
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 takerAssetAmount: new BigNumber(1),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
@@ -821,7 +816,7 @@ describe('matchOrders', () => {
                 makerAssetData: assetProxyUtils.encodeERC721ProxyData(defaultERC721AssetAddress, erc721TokenToTransfer),
                 takerAssetData: assetProxyUtils.encodeERC20ProxyData(defaultERC20MakerAssetAddress),
                 makerAssetAmount: new BigNumber(1),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(10), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
diff --git a/packages/contracts/test/exchange/signature_validator.ts b/packages/contracts/test/exchange/signature_validator.ts
index d96b9e3fb..91614c666 100644
--- a/packages/contracts/test/exchange/signature_validator.ts
+++ b/packages/contracts/test/exchange/signature_validator.ts
@@ -1,4 +1,3 @@
-import { ZeroEx } from '0x.js';
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
@@ -39,7 +38,6 @@ describe('MixinSignatureValidator', () => {
             provider,
             txDefaults,
         );
-        const zeroEx = new ZeroEx(provider, { networkId: constants.TESTRPC_NETWORK_ID });
 
         const defaultOrderParams = {
             ...constants.STATIC_ORDER_PARAMS,
diff --git a/packages/contracts/test/exchange/transactions.ts b/packages/contracts/test/exchange/transactions.ts
index 798c8283b..203c05e53 100644
--- a/packages/contracts/test/exchange/transactions.ts
+++ b/packages/contracts/test/exchange/transactions.ts
@@ -1,5 +1,3 @@
-import { ZeroEx } from '0x.js';
-
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
@@ -59,8 +57,6 @@ describe('Exchange transactions', () => {
     let defaultMakerTokenAddress: string;
     let defaultTakerTokenAddress: string;
 
-    let zeroEx: ZeroEx;
-
     before(async () => {
         await blockchainLifecycle.startAsync();
     });
@@ -83,11 +79,7 @@ describe('Exchange transactions', () => {
             txDefaults,
             assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
         );
-        zeroEx = new ZeroEx(provider, {
-            exchangeContractAddress: exchange.address,
-            networkId: constants.TESTRPC_NETWORK_ID,
-        });
-        exchangeWrapper = new ExchangeWrapper(exchange, zeroEx);
+        exchangeWrapper = new ExchangeWrapper(exchange, provider);
         await exchangeWrapper.registerAssetProxyAsync(AssetProxyId.ERC20, erc20Proxy.address, owner);
 
         await web3Wrapper.awaitTransactionMinedAsync(
@@ -188,7 +180,7 @@ describe('Exchange transactions', () => {
             it('should reset the currentContextAddress', async () => {
                 await exchangeWrapper.executeTransactionAsync(signedTx, senderAddress);
                 const currentContextAddress = await exchange.currentContextAddress.callAsync();
-                expect(currentContextAddress).to.equal(ZeroEx.NULL_ADDRESS);
+                expect(currentContextAddress).to.equal(constants.NULL_ADDRESS);
             });
         });
 
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index caaceb460..39f861968 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -1,4 +1,3 @@
-import { ZeroEx } from '0x.js';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -54,8 +53,6 @@ describe('Exchange wrappers', () => {
     let defaultMakerAssetAddress: string;
     let defaultTakerAssetAddress: string;
 
-    let zeroEx: ZeroEx;
-
     before(async () => {
         await blockchainLifecycle.startAsync();
     });
@@ -86,11 +83,7 @@ describe('Exchange wrappers', () => {
             txDefaults,
             assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
         );
-        zeroEx = new ZeroEx(provider, {
-            exchangeContractAddress: exchange.address,
-            networkId: constants.TESTRPC_NETWORK_ID,
-        });
-        exchangeWrapper = new ExchangeWrapper(exchange, zeroEx);
+        exchangeWrapper = new ExchangeWrapper(exchange, provider);
         await exchangeWrapper.registerAssetProxyAsync(AssetProxyId.ERC20, erc20Proxy.address, owner);
         await exchangeWrapper.registerAssetProxyAsync(AssetProxyId.ERC721, erc721Proxy.address, owner);
 
@@ -131,8 +124,8 @@ describe('Exchange wrappers', () => {
     describe('fillOrKillOrder', () => {
         it('should transfer the correct amounts', async () => {
             const signedOrder = orderFactory.newSignedOrder({
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
             const takerAssetFillAmount = signedOrder.takerAssetAmount.div(2);
             await exchangeWrapper.fillOrKillOrderAsync(signedOrder, takerAddress, {
@@ -199,8 +192,8 @@ describe('Exchange wrappers', () => {
     describe('fillOrderNoThrow', () => {
         it('should transfer the correct amounts', async () => {
             const signedOrder = orderFactory.newSignedOrder({
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
             const takerAssetFillAmount = signedOrder.takerAssetAmount.div(2);
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress, {
@@ -243,7 +236,7 @@ describe('Exchange wrappers', () => {
 
         it('should not change erc20Balances if maker erc20Balances are too low to fill order', async () => {
             const signedOrder = orderFactory.newSignedOrder({
-                makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18),
+                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress);
@@ -253,7 +246,7 @@ describe('Exchange wrappers', () => {
 
         it('should not change erc20Balances if taker erc20Balances are too low to fill order', async () => {
             const signedOrder = orderFactory.newSignedOrder({
-                takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18),
+                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress);
@@ -644,7 +637,7 @@ describe('Exchange wrappers', () => {
             });
 
             it('should fill all signedOrders if cannot fill entire takerAssetFillAmount', async () => {
-                const takerAssetFillAmount = ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18);
+                const takerAssetFillAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18);
                 _.forEach(signedOrders, signedOrder => {
                     erc20Balances[makerAddress][defaultMakerAssetAddress] = erc20Balances[makerAddress][
                         defaultMakerAssetAddress
@@ -687,7 +680,7 @@ describe('Exchange wrappers', () => {
 
                 return expect(
                     exchangeWrapper.marketSellOrdersAsync(signedOrders, takerAddress, {
-                        takerAssetFillAmount: ZeroEx.toBaseUnitAmount(new BigNumber(1000), 18),
+                        takerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
                 ).to.be.rejectedWith(constants.REVERT);
             });
@@ -733,7 +726,7 @@ describe('Exchange wrappers', () => {
             });
 
             it('should fill all signedOrders if cannot fill entire takerAssetFillAmount', async () => {
-                const takerAssetFillAmount = ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18);
+                const takerAssetFillAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18);
                 _.forEach(signedOrders, signedOrder => {
                     erc20Balances[makerAddress][defaultMakerAssetAddress] = erc20Balances[makerAddress][
                         defaultMakerAssetAddress
@@ -776,7 +769,7 @@ describe('Exchange wrappers', () => {
 
                 return expect(
                     exchangeWrapper.marketSellOrdersNoThrowAsync(signedOrders, takerAddress, {
-                        takerAssetFillAmount: ZeroEx.toBaseUnitAmount(new BigNumber(1000), 18),
+                        takerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
                 ).to.be.rejectedWith(constants.REVERT);
             });
@@ -822,7 +815,7 @@ describe('Exchange wrappers', () => {
             });
 
             it('should fill all signedOrders if cannot fill entire makerAssetFillAmount', async () => {
-                const makerAssetFillAmount = ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18);
+                const makerAssetFillAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18);
                 _.forEach(signedOrders, signedOrder => {
                     erc20Balances[makerAddress][defaultMakerAssetAddress] = erc20Balances[makerAddress][
                         defaultMakerAssetAddress
@@ -865,7 +858,7 @@ describe('Exchange wrappers', () => {
 
                 return expect(
                     exchangeWrapper.marketBuyOrdersAsync(signedOrders, takerAddress, {
-                        makerAssetFillAmount: ZeroEx.toBaseUnitAmount(new BigNumber(1000), 18),
+                        makerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
                 ).to.be.rejectedWith(constants.REVERT);
             });
@@ -911,7 +904,7 @@ describe('Exchange wrappers', () => {
             });
 
             it('should fill all signedOrders if cannot fill entire takerAssetFillAmount', async () => {
-                const takerAssetFillAmount = ZeroEx.toBaseUnitAmount(new BigNumber(100000), 18);
+                const takerAssetFillAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18);
                 _.forEach(signedOrders, signedOrder => {
                     erc20Balances[makerAddress][defaultMakerAssetAddress] = erc20Balances[makerAddress][
                         defaultMakerAssetAddress
@@ -954,7 +947,7 @@ describe('Exchange wrappers', () => {
 
                 return expect(
                     exchangeWrapper.marketBuyOrdersNoThrowAsync(signedOrders, takerAddress, {
-                        makerAssetFillAmount: ZeroEx.toBaseUnitAmount(new BigNumber(1000), 18),
+                        makerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
                 ).to.be.rejectedWith(constants.REVERT);
             });