Merge branch 'v2-prototype' into feature/website/wallet-flex-box

* v2-prototype: (95 commits)
  Add missing dep to website
  Upgrade solidity parser
  Fix trace test
  Fix linter issues
  Move contract utils
  Fix prettier
  Fix NameResolver
  Fix prettier
  Remove 0x.js as a dependency from website
  Enable 0x.js tests
  Fix small bug in order-utils
  Address feedback
  Fix Tslint error caused by "PromiseLike" value
  Fix Tslint error caused by "PromiseLike" value
  Update dogfood url
  fix contract-wrappers version
  Parse compiler.json in SolCompilerArtifactsAdapter
  Fix TokenTransferProxy artifact name since it's now suffixed with _v1
  Update yarn.lock
  Fix signature verification test
  ...

32 files changed, 804 insertions, 523 deletions

diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index 9c7142cdb..1c66a3b86 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -1,7 +1,7 @@
 {
     "private": true,
     "name": "contracts",
-    "version": "2.1.28",
+    "version": "2.1.29",
     "engines": {
         "node": ">=6.12"
     },
@@ -28,8 +28,7 @@
         "test:circleci": "yarn test:coverage"
     },
     "config": {
-        "abis":
-            "../migrations/artifacts/2.0.0/@(DummyERC20Token|DummyERC721Token|ERC20Proxy|ERC721Proxy|Exchange|MixinAuthorizable|MultiSigWallet|MultiSigWalletWithTimeLock|MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress|TestAssetProxyDispatcher|TestLibBytes|TestLibs|TestSignatureValidator|TokenRegistry|WETH9|ZRXToken).json"
+        "abis": "../migrations/artifacts/2.0.0/@(DummyERC20Token|DummyERC721Token|ERC20Proxy|ERC721Proxy|Exchange|MixinAuthorizable|MultiSigWallet|MultiSigWalletWithTimeLock|MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress|TestAssetProxyDispatcher|TestLibBytes|TestLibs|TestSignatureValidator|TokenRegistry|WETH9|ZRXToken).json"
     },
     "repository": {
         "type": "git",
@@ -42,9 +41,11 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/packages/contracts/README.md",
     "devDependencies": {
-        "@0xproject/abi-gen": "^0.2.13",
-        "@0xproject/dev-utils": "^0.4.1",
-        "@0xproject/tslint-config": "^0.4.17",
+        "@0xproject/abi-gen": "^0.3.0",
+        "@0xproject/dev-utils": "^0.4.2",
+        "@0xproject/tslint-config": "^0.4.18",
+        "@0xproject/subproviders": "^0.10.1",
+        "@0xproject/sol-cov": "^0.0.11",
         "@types/lodash": "4.14.104",
         "@types/node": "^8.0.53",
         "@types/yargs": "^10.0.0",
@@ -64,13 +65,14 @@
         "yargs": "^10.0.3"
     },
     "dependencies": {
-        "0x.js": "^0.37.2",
-        "@0xproject/base-contract": "^0.3.1",
-        "@0xproject/sol-compiler": "^0.4.3",
-        "@0xproject/types": "^0.6.3",
-        "@0xproject/typescript-typings": "^0.3.1",
-        "@0xproject/utils": "^0.6.1",
-        "@0xproject/web3-wrapper": "^0.6.3",
+        "@0xproject/base-contract": "^0.3.2",
+        "@0xproject/contract-wrappers": "^0.0.2",
+        "@0xproject/order-utils": "^0.0.5",
+        "@0xproject/sol-compiler": "^0.5.0",
+        "@0xproject/types": "^0.7.0",
+        "@0xproject/typescript-typings": "^0.3.2",
+        "@0xproject/utils": "^0.6.2",
+        "@0xproject/web3-wrapper": "^0.6.4",
         "bn.js": "^4.11.8",
         "ethereumjs-abi": "^0.6.4",
         "ethereumjs-util": "^5.1.1",
diff --git a/packages/contracts/src/utils/address_utils.ts b/packages/contracts/src/utils/address_utils.ts
index 01a7a6fd4..dc63459f9 100644
--- a/packages/contracts/src/utils/address_utils.ts
+++ b/packages/contracts/src/utils/address_utils.ts
@@ -1,10 +1,10 @@
-import { ZeroEx } from '0x.js';
+import { generatePseudoRandomSalt } from '@0xproject/order-utils';
 
 import { crypto } from './crypto';
 
 export const addressUtils = {
     generatePseudoRandomAddress(): string {
-        const randomBigNum = ZeroEx.generatePseudoRandomSalt();
+        const randomBigNum = generatePseudoRandomSalt();
         const randomBuff = crypto.solSHA3([randomBigNum]);
         const randomAddress = `0x${randomBuff.slice(0, 20).toString('hex')}`;
         return randomAddress;
diff --git a/packages/contracts/src/utils/constants.ts b/packages/contracts/src/utils/constants.ts
index 3fd2a0a3b..483340186 100644
--- a/packages/contracts/src/utils/constants.ts
+++ b/packages/contracts/src/utils/constants.ts
@@ -1,5 +1,5 @@
-import { ZeroEx } from '0x.js';
 import { BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
 
@@ -20,6 +20,7 @@ export const constants = {
     INVALID_OPCODE: 'invalid opcode',
     REVERT: 'revert',
     TESTRPC_NETWORK_ID: 50,
+    AWAIT_TRANSACTION_MINED_MS: 100,
     MAX_ETHERTOKEN_WITHDRAW_GAS: 43000,
     MAX_TOKEN_TRANSFERFROM_GAS: 80000,
     MAX_TOKEN_APPROVE_GAS: 60000,
@@ -30,13 +31,14 @@ export const constants = {
     NUM_DUMMY_ERC20_TO_DEPLOY: 3,
     NUM_DUMMY_ERC721_TO_DEPLOY: 1,
     NUM_ERC721_TOKENS_TO_MINT: 2,
+    NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
     TESTRPC_PRIVATE_KEYS: _.map(TESTRPC_PRIVATE_KEYS_STRINGS, privateKeyString => ethUtil.toBuffer(privateKeyString)),
-    INITIAL_ERC20_BALANCE: ZeroEx.toBaseUnitAmount(new BigNumber(10000), 18),
-    INITIAL_ERC20_ALLOWANCE: ZeroEx.toBaseUnitAmount(new BigNumber(10000), 18),
+    INITIAL_ERC20_BALANCE: Web3Wrapper.toBaseUnitAmount(new BigNumber(10000), 18),
+    INITIAL_ERC20_ALLOWANCE: Web3Wrapper.toBaseUnitAmount(new BigNumber(10000), 18),
     STATIC_ORDER_PARAMS: {
-        makerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(100), 18),
-        takerAssetAmount: ZeroEx.toBaseUnitAmount(new BigNumber(200), 18),
-        makerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
-        takerFee: ZeroEx.toBaseUnitAmount(new BigNumber(1), 18),
+        makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
+        takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
+        makerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
+        takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
     },
 };
diff --git a/packages/contracts/src/utils/coverage.ts b/packages/contracts/src/utils/coverage.ts
new file mode 100644
index 000000000..a37939464
--- /dev/null
+++ b/packages/contracts/src/utils/coverage.ts
@@ -0,0 +1,21 @@
+import { devConstants } from '@0xproject/dev-utils';
+import { CoverageSubprovider, SolCompilerArtifactAdapter } from '@0xproject/sol-cov';
+import * as fs from 'fs';
+import * as _ from 'lodash';
+
+let coverageSubprovider: CoverageSubprovider;
+
+export const coverage = {
+    getCoverageSubproviderSingleton(): CoverageSubprovider {
+        if (_.isUndefined(coverageSubprovider)) {
+            coverageSubprovider = coverage._getCoverageSubprovider();
+        }
+        return coverageSubprovider;
+    },
+    _getCoverageSubprovider(): CoverageSubprovider {
+        const defaultFromAddress = devConstants.TESTRPC_FIRST_ADDRESS;
+        const solCompilerArtifactAdapter = new SolCompilerArtifactAdapter();
+        const subprovider = new CoverageSubprovider(solCompilerArtifactAdapter, defaultFromAddress);
+        return subprovider;
+    },
+};
diff --git a/packages/contracts/src/utils/erc20_wrapper.ts b/packages/contracts/src/utils/erc20_wrapper.ts
index f12571b48..0303649a5 100644
--- a/packages/contracts/src/utils/erc20_wrapper.ts
+++ b/packages/contracts/src/utils/erc20_wrapper.ts
@@ -23,7 +23,7 @@ export class ERC20Wrapper {
     }
     public async deployDummyTokensAsync(): Promise<DummyERC20TokenContract[]> {
         this._dummyTokenContracts = await Promise.all(
-            _.times(constants.NUM_DUMMY_ERC20_TO_DEPLOY, () =>
+            _.times(constants.NUM_DUMMY_ERC20_TO_DEPLOY, async () =>
                 DummyERC20TokenContract.deployFrom0xArtifactAsync(
                     artifacts.DummyERC20Token,
                     this._provider,
@@ -45,7 +45,7 @@ export class ERC20Wrapper {
         );
         return this._proxyContract;
     }
-    public async setBalancesAndAllowancesAsync() {
+    public async setBalancesAndAllowancesAsync(): Promise<void> {
         this._validateDummyTokenContractsExistOrThrow();
         this._validateProxyContractExistsOrThrow();
         const setBalancePromises: Array<Promise<string>> = [];
@@ -103,12 +103,12 @@ export class ERC20Wrapper {
         const tokenAddresses = _.map(this._dummyTokenContracts, dummyTokenContract => dummyTokenContract.address);
         return tokenAddresses;
     }
-    private _validateDummyTokenContractsExistOrThrow() {
+    private _validateDummyTokenContractsExistOrThrow(): void {
         if (_.isUndefined(this._dummyTokenContracts)) {
             throw new Error('Dummy ERC20 tokens not yet deployed, please call "deployDummyTokensAsync"');
         }
     }
-    private _validateProxyContractExistsOrThrow() {
+    private _validateProxyContractExistsOrThrow(): void {
         if (_.isUndefined(this._proxyContract)) {
             throw new Error('ERC20 proxy contract not yet deployed, please call "deployProxyAsync"');
         }
diff --git a/packages/contracts/src/utils/erc721_wrapper.ts b/packages/contracts/src/utils/erc721_wrapper.ts
index 5b5de262f..aee796e4b 100644
--- a/packages/contracts/src/utils/erc721_wrapper.ts
+++ b/packages/contracts/src/utils/erc721_wrapper.ts
@@ -1,4 +1,4 @@
-import { ZeroEx } from '0x.js';
+import { generatePseudoRandomSalt } from '@0xproject/order-utils';
 import { Provider } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
@@ -25,7 +25,7 @@ export class ERC721Wrapper {
     }
     public async deployDummyTokensAsync(): Promise<DummyERC721TokenContract[]> {
         this._dummyTokenContracts = await Promise.all(
-            _.times(constants.NUM_DUMMY_ERC721_TO_DEPLOY, () =>
+            _.times(constants.NUM_DUMMY_ERC721_TO_DEPLOY, async () =>
                 DummyERC721TokenContract.deployFrom0xArtifactAsync(
                     artifacts.DummyERC721Token,
                     this._provider,
@@ -45,7 +45,7 @@ export class ERC721Wrapper {
         );
         return this._proxyContract;
     }
-    public async setBalancesAndAllowancesAsync() {
+    public async setBalancesAndAllowancesAsync(): Promise<void> {
         this._validateDummyTokenContractsExistOrThrow();
         this._validateProxyContractExistsOrThrow();
         const setBalancePromises: Array<Promise<string>> = [];
@@ -54,7 +54,7 @@ export class ERC721Wrapper {
         _.forEach(this._dummyTokenContracts, dummyTokenContract => {
             _.forEach(this._tokenOwnerAddresses, tokenOwnerAddress => {
                 _.forEach(_.range(constants.NUM_ERC721_TOKENS_TO_MINT), () => {
-                    const tokenId = ZeroEx.generatePseudoRandomSalt();
+                    const tokenId = generatePseudoRandomSalt();
                     setBalancePromises.push(
                         dummyTokenContract.mint.sendTransactionAsync(tokenOwnerAddress, tokenId, {
                             from: this._contractOwnerAddress,
@@ -125,17 +125,17 @@ export class ERC721Wrapper {
         const tokenAddresses = _.map(this._dummyTokenContracts, dummyTokenContract => dummyTokenContract.address);
         return tokenAddresses;
     }
-    private _validateDummyTokenContractsExistOrThrow() {
+    private _validateDummyTokenContractsExistOrThrow(): void {
         if (_.isUndefined(this._dummyTokenContracts)) {
             throw new Error('Dummy ERC721 tokens not yet deployed, please call "deployDummyTokensAsync"');
         }
     }
-    private _validateProxyContractExistsOrThrow() {
+    private _validateProxyContractExistsOrThrow(): void {
         if (_.isUndefined(this._proxyContract)) {
             throw new Error('ERC721 proxy contract not yet deployed, please call "deployProxyAsync"');
         }
     }
-    private _validateBalancesAndAllowancesSetOrThrow() {
+    private _validateBalancesAndAllowancesSetOrThrow(): void {
         if (_.keys(this._initialTokenIdsByOwner).length === 0) {
             throw new Error(
                 'Dummy ERC721 balances and allowances not yet set, please call "setBalancesAndAllowancesAsync"',
diff --git a/packages/contracts/src/utils/exchange_wrapper.ts b/packages/contracts/src/utils/exchange_wrapper.ts
index 46531fa3f..0d0977ab8 100644
--- a/packages/contracts/src/utils/exchange_wrapper.ts
+++ b/packages/contracts/src/utils/exchange_wrapper.ts
@@ -1,5 +1,6 @@
-import { TransactionReceiptWithDecodedLogs, ZeroEx } from '0x.js';
+import { Provider, TransactionReceiptWithDecodedLogs } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
@@ -13,11 +14,11 @@ import { AssetProxyId, OrderInfo, SignedOrder, SignedTransaction } from './types
 
 export class ExchangeWrapper {
     private _exchange: ExchangeContract;
+    private _web3Wrapper: Web3Wrapper;
     private _logDecoder: LogDecoder = new LogDecoder(constants.TESTRPC_NETWORK_ID);
-    private _zeroEx: ZeroEx;
-    constructor(exchangeContract: ExchangeContract, zeroEx: ZeroEx) {
+    constructor(exchangeContract: ExchangeContract, provider: Provider) {
         this._exchange = exchangeContract;
-        this._zeroEx = zeroEx;
+        this._web3Wrapper = new Web3Wrapper(provider);
     }
     public async fillOrderAsync(
         signedOrder: SignedOrder,
@@ -196,7 +197,7 @@ export class ExchangeWrapper {
         opts: { oldAssetProxyAddressIfExists?: string } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
         const oldAssetProxyAddress = _.isUndefined(opts.oldAssetProxyAddressIfExists)
-            ? ZeroEx.NULL_ADDRESS
+            ? constants.NULL_ADDRESS
             : opts.oldAssetProxyAddressIfExists;
         const txHash = await this._exchange.registerAssetProxy.sendTransactionAsync(
             assetProxyId,
@@ -245,8 +246,8 @@ export class ExchangeWrapper {
         const tx = await this._getTxWithDecodedExchangeLogsAsync(txHash);
         return tx;
     }
-    private async _getTxWithDecodedExchangeLogsAsync(txHash: string) {
-        const tx = await this._zeroEx.awaitTransactionMinedAsync(txHash);
+    private async _getTxWithDecodedExchangeLogsAsync(txHash: string): Promise<TransactionReceiptWithDecodedLogs> {
+        const tx = await this._web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
         tx.logs = _.filter(tx.logs, log => log.address === this._exchange.address);
         tx.logs = _.map(tx.logs, log => this._logDecoder.decodeLogOrThrow(log));
         return tx;
diff --git a/packages/contracts/src/utils/formatters.ts b/packages/contracts/src/utils/formatters.ts
index e706c15b5..bfa48d6f1 100644
--- a/packages/contracts/src/utils/formatters.ts
+++ b/packages/contracts/src/utils/formatters.ts
@@ -5,7 +5,7 @@ import { orderUtils } from './order_utils';
 import { BatchCancelOrders, BatchFillOrders, MarketBuyOrders, MarketSellOrders, SignedOrder } from './types';
 
 export const formatters = {
-    createBatchFill(signedOrders: SignedOrder[], takerAssetFillAmounts: BigNumber[] = []) {
+    createBatchFill(signedOrders: SignedOrder[], takerAssetFillAmounts: BigNumber[] = []): BatchFillOrders {
         const batchFill: BatchFillOrders = {
             orders: [],
             signatures: [],
@@ -21,7 +21,7 @@ export const formatters = {
         });
         return batchFill;
     },
-    createMarketSellOrders(signedOrders: SignedOrder[], takerAssetFillAmount: BigNumber) {
+    createMarketSellOrders(signedOrders: SignedOrder[], takerAssetFillAmount: BigNumber): MarketSellOrders {
         const marketSellOrders: MarketSellOrders = {
             orders: [],
             signatures: [],
@@ -34,7 +34,7 @@ export const formatters = {
         });
         return marketSellOrders;
     },
-    createMarketBuyOrders(signedOrders: SignedOrder[], makerAssetFillAmount: BigNumber) {
+    createMarketBuyOrders(signedOrders: SignedOrder[], makerAssetFillAmount: BigNumber): MarketBuyOrders {
         const marketBuyOrders: MarketBuyOrders = {
             orders: [],
             signatures: [],
@@ -47,7 +47,7 @@ export const formatters = {
         });
         return marketBuyOrders;
     },
-    createBatchCancel(signedOrders: SignedOrder[]) {
+    createBatchCancel(signedOrders: SignedOrder[]): BatchCancelOrders {
         const batchCancel: BatchCancelOrders = {
             orders: [],
         };
diff --git a/packages/contracts/test/utils/match_order_tester.ts b/packages/contracts/src/utils/match_order_tester.ts
index 14930de08..30039937f 100644
--- a/packages/contracts/test/utils/match_order_tester.ts
+++ b/packages/contracts/src/utils/match_order_tester.ts
@@ -1,28 +1,28 @@
-import { LogWithDecodedArgs, ZeroEx } from '0x.js';
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
+import { LogWithDecodedArgs } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
 
-import { DummyERC20TokenContract } from '../../src/contract_wrappers/generated/dummy_e_r_c20_token';
-import { DummyERC721TokenContract } from '../../src/contract_wrappers/generated/dummy_e_r_c721_token';
-import { ERC20ProxyContract } from '../../src/contract_wrappers/generated/e_r_c20_proxy';
-import { ERC721ProxyContract } from '../../src/contract_wrappers/generated/e_r_c721_proxy';
+import { DummyERC20TokenContract } from '../contract_wrappers/generated/dummy_e_r_c20_token';
+import { DummyERC721TokenContract } from '../contract_wrappers/generated/dummy_e_r_c721_token';
+import { ERC20ProxyContract } from '../contract_wrappers/generated/e_r_c20_proxy';
+import { ERC721ProxyContract } from '../contract_wrappers/generated/e_r_c721_proxy';
 import {
     CancelContractEventArgs,
     ExchangeContract,
     FillContractEventArgs,
-} from '../../src/contract_wrappers/generated/exchange';
-import { assetProxyUtils } from '../../src/utils/asset_proxy_utils';
-import { chaiSetup } from '../../src/utils/chai_setup';
-import { constants } from '../../src/utils/constants';
-import { crypto } from '../../src/utils/crypto';
-import { ERC20Wrapper } from '../../src/utils/erc20_wrapper';
-import { ERC721Wrapper } from '../../src/utils/erc721_wrapper';
-import { ExchangeWrapper } from '../../src/utils/exchange_wrapper';
-import { OrderFactory } from '../../src/utils/order_factory';
-import { orderUtils } from '../../src/utils/order_utils';
+} from '../contract_wrappers/generated/exchange';
+import { assetProxyUtils } from '../utils/asset_proxy_utils';
+import { chaiSetup } from '../utils/chai_setup';
+import { constants } from '../utils/constants';
+import { crypto } from '../utils/crypto';
+import { ERC20Wrapper } from '../utils/erc20_wrapper';
+import { ERC721Wrapper } from '../utils/erc721_wrapper';
+import { ExchangeWrapper } from '../utils/exchange_wrapper';
+import { OrderFactory } from '../utils/order_factory';
+import { orderUtils } from '../utils/order_utils';
 import {
     AssetProxyId,
     ContractName,
@@ -31,8 +31,8 @@ import {
     ExchangeStatus,
     SignedOrder,
     TransferAmountsByMatchOrders as TransferAmounts,
-} from '../../src/utils/types';
-import { provider, web3Wrapper } from '../../src/utils/web3_wrapper';
+} from '../utils/types';
+import { provider, web3Wrapper } from '../utils/web3_wrapper';
 
 chaiSetup.configure();
 const expect = chai.expect;
@@ -55,10 +55,10 @@ export class MatchOrderTester {
         realERC20BalancesByOwner: ERC20BalancesByOwner,
         expectedNewERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
         realERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
-    ) {
+    ): boolean {
         // ERC20 Balances
-        const erc20BalancesMatch = _.isEqual(expectedNewERC20BalancesByOwner, realERC20BalancesByOwner);
-        if (!erc20BalancesMatch) {
+        const doesErc20BalancesMatch = _.isEqual(expectedNewERC20BalancesByOwner, realERC20BalancesByOwner);
+        if (!doesErc20BalancesMatch) {
             return false;
         }
         // ERC721 Token Ids
@@ -75,8 +75,11 @@ export class MatchOrderTester {
                 _.sortBy(tokenIds);
             });
         });
-        const erc721TokenIdsMatch = _.isEqual(sortedExpectedNewERC721TokenIdsByOwner, sortedNewERC721TokenIdsByOwner);
-        return erc721TokenIdsMatch;
+        const doesErc721TokenIdsMatch = _.isEqual(
+            sortedExpectedNewERC721TokenIdsByOwner,
+            sortedNewERC721TokenIdsByOwner,
+        );
+        return doesErc721TokenIdsMatch;
     }
     /// @dev Constructs new MatchOrderTester.
     /// @param exchangeWrapper Used to call to the Exchange.
@@ -156,13 +159,13 @@ export class MatchOrderTester {
             expectedTransferAmounts,
         );
         // Assert our expected balances are equal to the actual balances
-        const expectedBalancesMatchRealBalances = MatchOrderTester._compareExpectedAndRealBalances(
+        const didExpectedBalancesMatchRealBalances = MatchOrderTester._compareExpectedAndRealBalances(
             expectedERC20BalancesByOwner,
             newERC20BalancesByOwner,
             expectedERC721TokenIdsByOwner,
             newERC721TokenIdsByOwner,
         );
-        expect(expectedBalancesMatchRealBalances).to.be.true();
+        expect(didExpectedBalancesMatchRealBalances).to.be.true();
         return [newERC20BalancesByOwner, newERC721TokenIdsByOwner];
     }
     /// @dev Calculates expected transfer amounts between order makers, fee recipients, and
diff --git a/packages/contracts/src/utils/order_factory.ts b/packages/contracts/src/utils/order_factory.ts
index 044e9b865..86b3d5ac7 100644
--- a/packages/contracts/src/utils/order_factory.ts
+++ b/packages/contracts/src/utils/order_factory.ts
@@ -1,7 +1,8 @@
-import { ZeroEx } from '0x.js';
+import { generatePseudoRandomSalt } from '@0xproject/order-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 
+import { constants } from './constants';
 import { orderUtils } from './order_utils';
 import { signingUtils } from './signing_utils';
 import { SignatureType, SignedOrder, UnsignedOrder } from './types';
@@ -19,10 +20,10 @@ export class OrderFactory {
     ): SignedOrder {
         const randomExpiration = new BigNumber(Math.floor((Date.now() + Math.random() * 100000000000) / 1000));
         const order = ({
-            senderAddress: ZeroEx.NULL_ADDRESS,
+            senderAddress: constants.NULL_ADDRESS,
             expirationTimeSeconds: randomExpiration,
-            salt: ZeroEx.generatePseudoRandomSalt(),
-            takerAddress: ZeroEx.NULL_ADDRESS,
+            salt: generatePseudoRandomSalt(),
+            takerAddress: constants.NULL_ADDRESS,
             ...this._defaultOrderParams,
             ...customOrderParams,
         } as any) as UnsignedOrder;
diff --git a/packages/contracts/src/utils/order_utils.ts b/packages/contracts/src/utils/order_utils.ts
index 7a482ad9e..8adc6b735 100644
--- a/packages/contracts/src/utils/order_utils.ts
+++ b/packages/contracts/src/utils/order_utils.ts
@@ -4,7 +4,7 @@ import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
 
 import { crypto } from './crypto';
-import { OrderStruct, SignatureType, SignedOrder, UnsignedOrder } from './types';
+import { CancelOrder, MatchOrder, OrderStruct, SignatureType, SignedOrder, UnsignedOrder } from './types';
 
 export const orderUtils = {
     createFill: (signedOrder: SignedOrder, takerAssetFillAmount?: BigNumber) => {
@@ -15,7 +15,7 @@ export const orderUtils = {
         };
         return fill;
     },
-    createCancel(signedOrder: SignedOrder, takerAssetCancelAmount?: BigNumber) {
+    createCancel(signedOrder: SignedOrder, takerAssetCancelAmount?: BigNumber): CancelOrder {
         const cancel = {
             order: orderUtils.getOrderStruct(signedOrder),
             takerAssetCancelAmount: takerAssetCancelAmount || signedOrder.takerAssetAmount,
@@ -80,7 +80,7 @@ export const orderUtils = {
         const orderHashHex = `0x${orderHashBuff.toString('hex')}`;
         return orderHashHex;
     },
-    createMatchOrders(signedOrderLeft: SignedOrder, signedOrderRight: SignedOrder) {
+    createMatchOrders(signedOrderLeft: SignedOrder, signedOrderRight: SignedOrder): MatchOrder {
         const fill = {
             left: orderUtils.getOrderStruct(signedOrderLeft),
             right: orderUtils.getOrderStruct(signedOrderRight),
diff --git a/packages/contracts/src/utils/transaction_factory.ts b/packages/contracts/src/utils/transaction_factory.ts
index 3a4f48330..941bff96d 100644
--- a/packages/contracts/src/utils/transaction_factory.ts
+++ b/packages/contracts/src/utils/transaction_factory.ts
@@ -1,4 +1,4 @@
-import { ZeroEx } from '0x.js';
+import { generatePseudoRandomSalt } from '@0xproject/order-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as ethUtil from 'ethereumjs-util';
 
@@ -20,7 +20,7 @@ export class TransactionFactory {
         data: string,
         signatureType: SignatureType = SignatureType.Ecrecover,
     ): SignedTransaction {
-        const salt = ZeroEx.generatePseudoRandomSalt();
+        const salt = generatePseudoRandomSalt();
         const txHash = crypto.solSHA3([this._exchangeAddress, salt, ethUtil.toBuffer(data)]);
         const signature = signingUtils.signMessage(txHash, this._privateKey, signatureType);
         const signedTx = {
diff --git a/packages/contracts/src/utils/types.ts b/packages/contracts/src/utils/types.ts
index 8d81adece..ef86b4f38 100644
--- a/packages/contracts/src/utils/types.ts
+++ b/packages/contracts/src/utils/types.ts
@@ -197,3 +197,15 @@ export interface ProxyData {
     tokenAddress?: string;
     data?: any;
 }
+
+export interface CancelOrder {
+    order: OrderStruct;
+    takerAssetCancelAmount: BigNumber;
+}
+
+export interface MatchOrder {
+    left: OrderStruct;
+    right: OrderStruct;
+    leftSignature: string;
+    rightSignature: string;
+}
diff --git a/packages/contracts/src/utils/web3_wrapper.ts b/packages/contracts/src/utils/web3_wrapper.ts
index ed1c488a2..02595506b 100644
--- a/packages/contracts/src/utils/web3_wrapper.ts
+++ b/packages/contracts/src/utils/web3_wrapper.ts
@@ -1,12 +1,19 @@
-import { devConstants, web3Factory } from '@0xproject/dev-utils';
+import { devConstants, env, EnvVars, web3Factory } from '@0xproject/dev-utils';
+import { prependSubprovider } from '@0xproject/subproviders';
 import { Provider } from '@0xproject/types';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 
+import { coverage } from './coverage';
+
 export const txDefaults = {
     from: devConstants.TESTRPC_FIRST_ADDRESS,
     gas: devConstants.GAS_ESTIMATE,
 };
 const providerConfigs = { shouldUseInProcessGanache: true };
-export const web3 = web3Factory.create(providerConfigs);
-export const provider = web3.currentProvider;
+export const provider = web3Factory.getRpcProvider(providerConfigs);
+const isCoverageEnabled = env.parseBoolean(EnvVars.SolidityCoverage);
+if (isCoverageEnabled) {
+    const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
+    prependSubprovider(provider, coverageSubprovider);
+}
 export const web3Wrapper = new Web3Wrapper(provider);
diff --git a/packages/contracts/test/asset_proxy/authorizable.ts b/packages/contracts/test/asset_proxy/authorizable.ts
index 636b9096b..52e9ea87f 100644
--- a/packages/contracts/test/asset_proxy/authorizable.ts
+++ b/packages/contracts/test/asset_proxy/authorizable.ts
@@ -20,6 +20,12 @@ describe('Authorizable', () => {
     let address: string;
     let authorizable: MixinAuthorizableContract;
     before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         owner = address = accounts[0];
         notOwner = accounts[1];
@@ -42,12 +48,18 @@ describe('Authorizable', () => {
             ).to.be.rejectedWith(constants.REVERT);
         });
         it('should allow owner to add an authorized address', async () => {
-            await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
             const isAuthorized = await authorizable.authorized.callAsync(address);
             expect(isAuthorized).to.be.true();
         });
         it('should throw if owner attempts to authorize a duplicate address', async () => {
-            await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
             return expect(
                 authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
             ).to.be.rejectedWith(constants.REVERT);
@@ -56,7 +68,10 @@ describe('Authorizable', () => {
 
     describe('removeAuthorizedAddress', () => {
         it('should throw if not called by owner', async () => {
-            await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
             return expect(
                 authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
                     from: notOwner,
@@ -65,10 +80,16 @@ describe('Authorizable', () => {
         });
 
         it('should allow owner to remove an authorized address', async () => {
-            await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner });
-            await authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
-                from: owner,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
+                    from: owner,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
             const isAuthorized = await authorizable.authorized.callAsync(address);
             expect(isAuthorized).to.be.false();
         });
@@ -86,16 +107,22 @@ describe('Authorizable', () => {
         it('should return all authorized addresses', async () => {
             const initial = await authorizable.getAuthorizedAddresses.callAsync();
             expect(initial).to.have.length(0);
-            await authorizable.addAuthorizedAddress.sendTransactionAsync(address, {
-                from: owner,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await authorizable.addAuthorizedAddress.sendTransactionAsync(address, {
+                    from: owner,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
             const afterAdd = await authorizable.getAuthorizedAddresses.callAsync();
             expect(afterAdd).to.have.length(1);
             expect(afterAdd).to.include(address);
 
-            await authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
-                from: owner,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
+                    from: owner,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
             const afterRemove = await authorizable.getAuthorizedAddresses.callAsync();
             expect(afterRemove).to.have.length(0);
         });
diff --git a/packages/contracts/test/asset_proxy/proxies.ts b/packages/contracts/test/asset_proxy/proxies.ts
index e7ef9a0d3..4ee38db80 100644
--- a/packages/contracts/test/asset_proxy/proxies.ts
+++ b/packages/contracts/test/asset_proxy/proxies.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';
@@ -37,8 +36,12 @@ describe('Asset Transfer Proxies', () => {
     let erc721Wrapper: ERC721Wrapper;
     let erc721MakerTokenId: BigNumber;
 
-    let zeroEx: ZeroEx;
-
+    before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
     before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const usedAddresses = ([owner, notAuthorized, exchangeAddress, makerAddress, takerAddress] = accounts);
@@ -49,22 +52,24 @@ describe('Asset Transfer Proxies', () => {
         [zrxToken] = await erc20Wrapper.deployDummyTokensAsync();
         erc20Proxy = await erc20Wrapper.deployProxyAsync();
         await erc20Wrapper.setBalancesAndAllowancesAsync();
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeAddress, {
-            from: owner,
-        });
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeAddress, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
 
         [erc721Token] = await erc721Wrapper.deployDummyTokensAsync();
         erc721Proxy = await erc721Wrapper.deployProxyAsync();
         await erc721Wrapper.setBalancesAndAllowancesAsync();
         const erc721Balances = await erc721Wrapper.getBalancesAsync();
         erc721MakerTokenId = erc721Balances[makerAddress][erc721Token.address][0];
-        await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeAddress, {
-            from: owner,
-        });
-
-        zeroEx = new ZeroEx(provider, {
-            networkId: constants.TESTRPC_NETWORK_ID,
-        });
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeAddress, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
     });
     beforeEach(async () => {
         await blockchainLifecycle.startAsync();
@@ -80,12 +85,15 @@ describe('Asset Transfer Proxies', () => {
                 // Perform a transfer from makerAddress to takerAddress
                 const erc20Balances = await erc20Wrapper.getBalancesAsync();
                 const amount = new BigNumber(10);
-                await erc20Proxy.transferFrom.sendTransactionAsync(
-                    encodedProxyMetadata,
-                    makerAddress,
-                    takerAddress,
-                    amount,
-                    { from: exchangeAddress },
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await erc20Proxy.transferFrom.sendTransactionAsync(
+                        encodedProxyMetadata,
+                        makerAddress,
+                        takerAddress,
+                        amount,
+                        { from: exchangeAddress },
+                    ),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
                 );
                 // Verify transfer was successful
                 const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -103,12 +111,15 @@ describe('Asset Transfer Proxies', () => {
                 // Perform a transfer from makerAddress to takerAddress
                 const erc20Balances = await erc20Wrapper.getBalancesAsync();
                 const amount = new BigNumber(0);
-                await erc20Proxy.transferFrom.sendTransactionAsync(
-                    encodedProxyMetadata,
-                    makerAddress,
-                    takerAddress,
-                    amount,
-                    { from: exchangeAddress },
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await erc20Proxy.transferFrom.sendTransactionAsync(
+                        encodedProxyMetadata,
+                        makerAddress,
+                        takerAddress,
+                        amount,
+                        { from: exchangeAddress },
+                    ),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
                 );
                 // Verify transfer was successful
                 const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -126,9 +137,12 @@ describe('Asset Transfer Proxies', () => {
                 // Create allowance less than transfer amount. Set allowance on proxy.
                 const allowance = new BigNumber(0);
                 const transferAmount = new BigNumber(10);
-                await zrxToken.approve.sendTransactionAsync(erc20Proxy.address, allowance, {
-                    from: makerAddress,
-                });
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await zrxToken.approve.sendTransactionAsync(erc20Proxy.address, allowance, {
+                        from: makerAddress,
+                    }),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
                 // Perform a transfer; expect this to fail.
                 return expect(
                     erc20Proxy.transferFrom.sendTransactionAsync(
@@ -179,7 +193,7 @@ describe('Asset Transfer Proxies', () => {
                     amounts,
                     { from: exchangeAddress },
                 );
-                const res = await zeroEx.awaitTransactionMinedAsync(txHash);
+                const res = await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
                 const newBalances = await erc20Wrapper.getBalancesAsync();
 
                 expect(res.logs.length).to.equal(numTransfers);
@@ -200,7 +214,7 @@ describe('Asset Transfer Proxies', () => {
                 const toAddresses = _.times(numTransfers, () => takerAddress);
                 const amounts = _.times(numTransfers, () => amount);
 
-                expect(
+                return expect(
                     erc20Proxy.batchTransferFrom.sendTransactionAsync(
                         assetMetadata,
                         fromAddresses,
@@ -232,12 +246,15 @@ describe('Asset Transfer Proxies', () => {
                 // Perform a transfer from makerAddress to takerAddress
                 const erc20Balances = await erc20Wrapper.getBalancesAsync();
                 const amount = new BigNumber(1);
-                await erc721Proxy.transferFrom.sendTransactionAsync(
-                    encodedProxyMetadata,
-                    makerAddress,
-                    takerAddress,
-                    amount,
-                    { from: exchangeAddress },
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await erc721Proxy.transferFrom.sendTransactionAsync(
+                        encodedProxyMetadata,
+                        makerAddress,
+                        takerAddress,
+                        amount,
+                        { from: exchangeAddress },
+                    ),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
                 );
                 // Verify transfer was successful
                 const newOwnerMakerAsset = await erc721Token.ownerOf.callAsync(erc721MakerTokenId);
@@ -297,9 +314,12 @@ describe('Asset Transfer Proxies', () => {
                     erc721MakerTokenId,
                 );
                 // Remove transfer approval for makerAddress.
-                await erc721Token.setApprovalForAll.sendTransactionAsync(erc721Proxy.address, false, {
-                    from: makerAddress,
-                });
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await erc721Token.setApprovalForAll.sendTransactionAsync(erc721Proxy.address, false, {
+                        from: makerAddress,
+                    }),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
                 // Perform a transfer; expect this to fail.
                 const amount = new BigNumber(1);
                 return expect(
@@ -356,7 +376,7 @@ describe('Asset Transfer Proxies', () => {
                     amounts,
                     { from: exchangeAddress },
                 );
-                const res = await zeroEx.awaitTransactionMinedAsync(txHash);
+                const res = await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
                 expect(res.logs.length).to.equal(numTransfers);
 
                 const newOwnerMakerAssetA = await erc721Token.ownerOf.callAsync(makerTokenIdA);
@@ -378,7 +398,7 @@ describe('Asset Transfer Proxies', () => {
                 const toAddresses = _.times(numTransfers, () => takerAddress);
                 const amounts = _.times(numTransfers, () => new BigNumber(1));
 
-                expect(
+                return expect(
                     erc721Proxy.batchTransferFrom.sendTransactionAsync(
                         assetMetadata,
                         fromAddresses,
diff --git a/packages/contracts/test/ether_token.ts b/packages/contracts/test/ether_token.ts
index 418fbc45e..9b04dd187 100644
--- a/packages/contracts/test/ether_token.ts
+++ b/packages/contracts/test/ether_token.ts
@@ -1,4 +1,4 @@
-import { ContractWrappersError, ZeroEx } from '0x.js';
+import { ContractWrappers, ContractWrappersError } from '@0xproject/contract-wrappers';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber, promisify } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -17,16 +17,23 @@ const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 
 describe('EtherToken', () => {
     let account: string;
-    const gasPrice = ZeroEx.toBaseUnitAmount(new BigNumber(20), 9);
-    let zeroEx: ZeroEx;
+    const gasPrice = Web3Wrapper.toBaseUnitAmount(new BigNumber(20), 9);
+    let contractWrappers: ContractWrappers;
     let etherTokenAddress: string;
+
+    before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
     before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         account = accounts[0];
 
         const etherToken = await WETH9Contract.deployFrom0xArtifactAsync(artifacts.EtherToken, provider, txDefaults);
         etherTokenAddress = etherToken.address;
-        zeroEx = new ZeroEx(provider, {
+        contractWrappers = new ContractWrappers(provider, {
             gasPrice,
             networkId: constants.TESTRPC_NETWORK_ID,
         });
@@ -42,23 +49,23 @@ describe('EtherToken', () => {
             const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
             const ethToDeposit = initEthBalance.plus(1);
 
-            return expect(zeroEx.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account)).to.be.rejectedWith(
-                ContractWrappersError.InsufficientEthBalanceForDeposit,
-            );
+            return expect(
+                contractWrappers.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account),
+            ).to.be.rejectedWith(ContractWrappersError.InsufficientEthBalanceForDeposit);
         });
 
         it('should convert deposited Ether to wrapped Ether tokens', async () => {
             const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
+            const initEthTokenBalance = await contractWrappers.token.getBalanceAsync(etherTokenAddress, account);
 
             const ethToDeposit = new BigNumber(Web3Wrapper.toWei(new BigNumber(1)));
 
-            const txHash = await zeroEx.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account);
-            const receipt = await zeroEx.awaitTransactionMinedAsync(txHash);
+            const txHash = await contractWrappers.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account);
+            const receipt = await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
 
             const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
             const finalEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
-            const finalEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
+            const finalEthTokenBalance = await contractWrappers.token.getBalanceAsync(etherTokenAddress, account);
 
             expect(finalEthBalance).to.be.bignumber.equal(initEthBalance.minus(ethToDeposit.plus(ethSpentOnGas)));
             expect(finalEthTokenBalance).to.be.bignumber.equal(initEthTokenBalance.plus(ethToDeposit));
@@ -67,29 +74,34 @@ describe('EtherToken', () => {
 
     describe('withdraw', () => {
         it('should throw if caller attempts to withdraw greater than caller balance', async () => {
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
+            const initEthTokenBalance = await contractWrappers.token.getBalanceAsync(etherTokenAddress, account);
             const ethTokensToWithdraw = initEthTokenBalance.plus(1);
 
             return expect(
-                zeroEx.etherToken.withdrawAsync(etherTokenAddress, ethTokensToWithdraw, account),
+                contractWrappers.etherToken.withdrawAsync(etherTokenAddress, ethTokensToWithdraw, account),
             ).to.be.rejectedWith(ContractWrappersError.InsufficientWEthBalanceForWithdrawal);
         });
 
         it('should convert ether tokens to ether with sufficient balance', async () => {
             const ethToDeposit = new BigNumber(Web3Wrapper.toWei(new BigNumber(1)));
-            await zeroEx.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account);
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
+            await contractWrappers.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account);
+            const initEthTokenBalance = await contractWrappers.token.getBalanceAsync(etherTokenAddress, account);
             const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
             const ethTokensToWithdraw = initEthTokenBalance;
             expect(ethTokensToWithdraw).to.not.be.bignumber.equal(0);
-            const txHash = await zeroEx.etherToken.withdrawAsync(etherTokenAddress, ethTokensToWithdraw, account, {
-                gasLimit: constants.MAX_ETHERTOKEN_WITHDRAW_GAS,
-            });
-            const receipt = await zeroEx.awaitTransactionMinedAsync(txHash);
+            const txHash = await contractWrappers.etherToken.withdrawAsync(
+                etherTokenAddress,
+                ethTokensToWithdraw,
+                account,
+                {
+                    gasLimit: constants.MAX_ETHERTOKEN_WITHDRAW_GAS,
+                },
+            );
+            const receipt = await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
 
             const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
             const finalEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
-            const finalEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
+            const finalEthTokenBalance = await contractWrappers.token.getBalanceAsync(etherTokenAddress, account);
 
             expect(finalEthBalance).to.be.bignumber.equal(
                 initEthBalance.plus(ethTokensToWithdraw.minus(ethSpentOnGas)),
@@ -101,9 +113,9 @@ describe('EtherToken', () => {
     describe('fallback', () => {
         it('should convert sent ether to ether tokens', async () => {
             const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
+            const initEthTokenBalance = await contractWrappers.token.getBalanceAsync(etherTokenAddress, account);
 
-            const ethToDeposit = ZeroEx.toBaseUnitAmount(new BigNumber(1), 18);
+            const ethToDeposit = Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18);
 
             const txHash = await web3Wrapper.sendTransactionAsync({
                 from: account,
@@ -112,11 +124,11 @@ describe('EtherToken', () => {
                 gasPrice,
             });
 
-            const receipt = await zeroEx.awaitTransactionMinedAsync(txHash);
+            const receipt = await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
 
             const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
             const finalEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
-            const finalEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
+            const finalEthTokenBalance = await contractWrappers.token.getBalanceAsync(etherTokenAddress, account);
 
             expect(finalEthBalance).to.be.bignumber.equal(initEthBalance.minus(ethToDeposit.plus(ethSpentOnGas)));
             expect(finalEthTokenBalance).to.be.bignumber.equal(initEthTokenBalance.plus(ethToDeposit));
diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index be3252800..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 +60,12 @@ describe('Exchange core', () => {
     let defaultMakerAssetAddress: string;
     let defaultTakerAssetAddress: string;
 
-    let zeroEx: ZeroEx;
-
+    before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
     before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const usedAddresses = ([owner, makerAddress, takerAddress, feeRecipientAddress] = accounts);
@@ -85,20 +90,22 @@ 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);
 
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
-            from: owner,
-        });
-        await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
-            from: owner,
-        });
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
 
         defaultMakerAssetAddress = erc20TokenA.address;
         defaultTakerAssetAddress = erc20TokenB.address;
@@ -166,8 +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(
@@ -219,8 +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(
@@ -272,8 +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(
@@ -326,8 +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(
@@ -445,8 +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,
@@ -455,7 +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');
@@ -501,7 +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(
@@ -511,7 +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(
@@ -520,23 +527,45 @@ describe('Exchange core', () => {
         });
 
         it('should throw if maker allowances are too low to fill order', async () => {
-            await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
-                from: makerAddress,
-            });
-            expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(constants.REVERT);
-            await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, constants.INITIAL_ERC20_ALLOWANCE, {
-                from: makerAddress,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
+                    from: makerAddress,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
+            // HACK: `rejectWith` returns a "promise-like" type, but not an actual "Promise", so TSLint
+            // complains, even though we do need to `await` it. So we disable the TSLint error below.
+            // tslint:disable-next-line:await-promise
+            await expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
+                constants.REVERT,
+            );
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, constants.INITIAL_ERC20_ALLOWANCE, {
+                    from: makerAddress,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
         });
 
         it('should throw if taker allowances are too low to fill order', async () => {
-            await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
-                from: takerAddress,
-            });
-            expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(constants.REVERT);
-            await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, constants.INITIAL_ERC20_ALLOWANCE, {
-                from: takerAddress,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
+                    from: takerAddress,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
+            // HACK: `rejectWith` returns a "promise-like" type, but not an actual "Promise", so TSLint
+            // complains, even though we do need to `await` it. So we disable the TSLint error below.
+            // tslint:disable-next-line:await-promise
+            await expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
+                constants.REVERT,
+            );
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, constants.INITIAL_ERC20_ALLOWANCE, {
+                    from: takerAddress,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
         });
 
         it('should not change erc20Balances if an order is expired', async () => {
@@ -681,23 +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),
                 }),
             ]);
@@ -873,7 +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),
             });
@@ -913,7 +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 db2f18ddc..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';
@@ -37,6 +36,12 @@ describe('AssetProxyDispatcher', () => {
     let erc721Wrapper: ERC721Wrapper;
 
     before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    before(async () => {
         // Setup accounts & addresses
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const usedAddresses = ([owner, notOwner, makerAddress, takerAddress] = accounts);
@@ -56,12 +61,18 @@ describe('AssetProxyDispatcher', () => {
             provider,
             txDefaults,
         );
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(assetProxyDispatcher.address, {
-            from: owner,
-        });
-        await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(assetProxyDispatcher.address, {
-            from: owner,
-        });
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(assetProxyDispatcher.address, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(assetProxyDispatcher.address, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
     });
     beforeEach(async () => {
         await blockchainLifecycle.startAsync();
@@ -71,12 +82,15 @@ describe('AssetProxyDispatcher', () => {
     });
     describe('registerAssetProxy', () => {
         it('should record proxy upon registration', async () => {
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                erc20Proxy.address,
-                prevProxyAddress,
-                { from: owner },
+            const prevProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    erc20Proxy.address,
+                    prevProxyAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             const proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(proxyAddress).to.be.equal(erc20Proxy.address);
@@ -84,22 +98,28 @@ describe('AssetProxyDispatcher', () => {
 
         it('should be able to record multiple proxies', async () => {
             // Record first proxy
-            const prevERC20ProxyAddress = ZeroEx.NULL_ADDRESS;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                erc20Proxy.address,
-                prevERC20ProxyAddress,
-                { from: owner },
+            const prevERC20ProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    erc20Proxy.address,
+                    prevERC20ProxyAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             let proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(proxyAddress).to.be.equal(erc20Proxy.address);
             // Record another proxy
-            const prevERC721ProxyAddress = ZeroEx.NULL_ADDRESS;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC721,
-                erc721Proxy.address,
-                prevERC721ProxyAddress,
-                { from: owner },
+            const prevERC721ProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC721,
+                    erc721Proxy.address,
+                    prevERC721ProxyAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC721);
             expect(proxyAddress).to.be.equal(erc721Proxy.address);
@@ -107,12 +127,15 @@ describe('AssetProxyDispatcher', () => {
 
         it('should replace proxy address upon re-registration', async () => {
             // Initial registration
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                erc20Proxy.address,
-                prevProxyAddress,
-                { from: owner },
+            const prevProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    erc20Proxy.address,
+                    prevProxyAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             let proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(proxyAddress).to.be.equal(erc20Proxy.address);
@@ -125,11 +148,14 @@ describe('AssetProxyDispatcher', () => {
             // Register new ERC20 Transfer Proxy contract
             const newAddress = newErc20TransferProxy.address;
             const currentAddress = erc20Proxy.address;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                newAddress,
-                currentAddress,
-                { from: owner },
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    newAddress,
+                    currentAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             // Verify new asset proxy has replaced initial version
             proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
@@ -138,21 +164,24 @@ describe('AssetProxyDispatcher', () => {
 
         it('should throw if registering with incorrect "currentAssetProxyAddress" field', async () => {
             // Initial registration
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                erc20Proxy.address,
-                prevProxyAddress,
-                { from: owner },
+            const prevProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    erc20Proxy.address,
+                    prevProxyAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             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);
@@ -160,29 +189,35 @@ describe('AssetProxyDispatcher', () => {
 
         it('should be able to reset proxy address to NULL', async () => {
             // Initial registration
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                erc20Proxy.address,
-                prevProxyAddress,
-                { from: owner },
+            const prevProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    erc20Proxy.address,
+                    prevProxyAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             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;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                newProxyAddress,
-                erc20Proxy.address,
-                { from: owner },
+            const newProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    newProxyAddress,
+                    erc20Proxy.address,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             const finalProxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(finalProxyAddress).to.be.equal(newProxyAddress);
         });
 
         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,
@@ -194,7 +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,
@@ -208,12 +243,15 @@ describe('AssetProxyDispatcher', () => {
 
     describe('getAssetProxy', () => {
         it('should return correct address of registered proxy', async () => {
-            const prevProxyAddress = ZeroEx.NULL_ADDRESS;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                erc20Proxy.address,
-                prevProxyAddress,
-                { from: owner },
+            const prevProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    erc20Proxy.address,
+                    prevProxyAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             const proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(proxyAddress).to.be.equal(erc20Proxy.address);
@@ -221,31 +259,37 @@ 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;
-            await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
-                AssetProxyId.ERC20,
-                erc20Proxy.address,
-                prevProxyAddress,
-                { from: owner },
+            const prevProxyAddress = constants.NULL_ADDRESS;
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
+                    AssetProxyId.ERC20,
+                    erc20Proxy.address,
+                    prevProxyAddress,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             // Construct metadata for ERC20 proxy
             const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Perform a transfer from makerAddress to takerAddress
             const erc20Balances = await erc20Wrapper.getBalancesAsync();
             const amount = new BigNumber(10);
-            await assetProxyDispatcher.publicDispatchTransferFrom.sendTransactionAsync(
-                encodedProxyMetadata,
-                makerAddress,
-                takerAddress,
-                amount,
-                { from: owner },
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await assetProxyDispatcher.publicDispatchTransferFrom.sendTransactionAsync(
+                    encodedProxyMetadata,
+                    makerAddress,
+                    takerAddress,
+                    amount,
+                    { from: owner },
+                ),
+                constants.AWAIT_TRANSACTION_MINED_MS,
             );
             // Verify transfer was successful
             const newBalances = await erc20Wrapper.getBalancesAsync();
diff --git a/packages/contracts/test/exchange/libs.ts b/packages/contracts/test/exchange/libs.ts
index 1036cb815..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';
@@ -26,10 +25,15 @@ describe('Exchange libs', () => {
     let libs: TestLibsContract;
 
     before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    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,
diff --git a/packages/contracts/test/exchange/match_orders.ts b/packages/contracts/test/exchange/match_orders.ts
index 94cdf4598..8a3c91520 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';
@@ -36,7 +37,7 @@ import {
 } from '../../src/utils/types';
 import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper';
 
-import { MatchOrderTester } from '../utils/match_order_tester';
+import { MatchOrderTester } from '../../src/utils/match_order_tester';
 
 chaiSetup.configure();
 const expect = chai.expect;
@@ -76,8 +77,12 @@ describe('matchOrders', () => {
 
     let matchOrderTester: MatchOrderTester;
 
-    let zeroEx: ZeroEx;
-
+    before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
     before(async () => {
         // Create accounts
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
@@ -111,20 +116,22 @@ 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
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
-            from: owner,
-        });
-        await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
-            from: owner,
-        });
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
         // Set default addresses
         defaultERC20MakerAssetAddress = erc20TokenA.address;
         defaultERC20TakerAssetAddress = erc20TokenB.address;
@@ -161,16 +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
@@ -195,16 +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
@@ -240,16 +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
@@ -274,16 +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
@@ -308,16 +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
@@ -347,8 +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
@@ -377,8 +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,
             });
 
@@ -386,8 +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
@@ -417,8 +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
@@ -450,16 +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
@@ -478,16 +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
@@ -507,16 +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
@@ -536,16 +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
@@ -565,16 +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
@@ -594,16 +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
@@ -622,16 +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
@@ -648,16 +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
@@ -674,16 +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
@@ -704,16 +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
@@ -734,16 +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
@@ -766,14 +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,
             });
@@ -800,7 +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,
             });
@@ -809,7 +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 489ed32c5..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';
@@ -26,6 +25,12 @@ describe('MixinSignatureValidator', () => {
     let signatureValidator: TestSignatureValidatorContract;
 
     before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const makerAddress = accounts[0];
         signatureValidator = await TestSignatureValidatorContract.deployFrom0xArtifactAsync(
@@ -33,7 +38,6 @@ describe('MixinSignatureValidator', () => {
             provider,
             txDefaults,
         );
-        const zeroEx = new ZeroEx(provider, { networkId: constants.TESTRPC_NETWORK_ID });
 
         const defaultOrderParams = {
             ...constants.STATIC_ORDER_PARAMS,
@@ -62,12 +66,12 @@ describe('MixinSignatureValidator', () => {
 
         it('should return true with a valid signature', async () => {
             const orderHashHex = orderUtils.getOrderHashHex(signedOrder);
-            const success = await signatureValidator.publicIsValidSignature.callAsync(
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
                 orderHashHex,
                 signedOrder.makerAddress,
                 signedOrder.signature,
             );
-            expect(success).to.be.true();
+            expect(isValidSignature).to.be.true();
         });
 
         it('should return false with an invalid signature', async () => {
@@ -81,12 +85,12 @@ describe('MixinSignatureValidator', () => {
             const invalidSigHex = `0x${invalidSigBuff.toString('hex')}`;
             signedOrder.signature = invalidSigHex;
             const orderHashHex = orderUtils.getOrderHashHex(signedOrder);
-            const success = await signatureValidator.publicIsValidSignature.callAsync(
+            const isValidSignature = await signatureValidator.publicIsValidSignature.callAsync(
                 orderHashHex,
                 signedOrder.makerAddress,
                 signedOrder.signature,
             );
-            expect(success).to.be.false();
+            expect(isValidSignature).to.be.false();
         });
     });
 });
diff --git a/packages/contracts/test/exchange/transactions.ts b/packages/contracts/test/exchange/transactions.ts
index 482475554..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 +57,12 @@ describe('Exchange transactions', () => {
     let defaultMakerTokenAddress: string;
     let defaultTakerTokenAddress: string;
 
-    let zeroEx: ZeroEx;
-
+    before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
     before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const usedAddresses = ([owner, senderAddress, makerAddress, takerAddress, feeRecipientAddress] = accounts);
@@ -77,14 +79,13 @@ 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 erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, { from: owner });
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, { from: owner }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
 
         defaultMakerTokenAddress = erc20TokenA.address;
         defaultTakerTokenAddress = erc20TokenB.address;
@@ -179,7 +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 0b79308dd..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 +53,12 @@ describe('Exchange wrappers', () => {
     let defaultMakerAssetAddress: string;
     let defaultTakerAssetAddress: string;
 
-    let zeroEx: ZeroEx;
-
+    before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
     before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const usedAddresses = ([owner, makerAddress, takerAddress, feeRecipientAddress] = accounts);
@@ -80,20 +83,22 @@ 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);
 
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
-            from: owner,
-        });
-        await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
-            from: owner,
-        });
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
+                from: owner,
+            }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
 
         defaultMakerAssetAddress = erc20TokenA.address;
         defaultTakerAssetAddress = erc20TokenB.address;
@@ -119,8 +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, {
@@ -187,8 +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, {
@@ -231,7 +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);
@@ -241,7 +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);
@@ -251,13 +256,19 @@ describe('Exchange wrappers', () => {
 
         it('should not change erc20Balances if maker allowances are too low to fill order', async () => {
             const signedOrder = orderFactory.newSignedOrder();
-            await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
-                from: makerAddress,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
+                    from: makerAddress,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress);
-            await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, constants.INITIAL_ERC20_ALLOWANCE, {
-                from: makerAddress,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, constants.INITIAL_ERC20_ALLOWANCE, {
+                    from: makerAddress,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
 
             const newBalances = await erc20Wrapper.getBalancesAsync();
             expect(newBalances).to.be.deep.equal(erc20Balances);
@@ -265,13 +276,19 @@ describe('Exchange wrappers', () => {
 
         it('should not change erc20Balances if taker allowances are too low to fill order', async () => {
             const signedOrder = orderFactory.newSignedOrder();
-            await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
-                from: takerAddress,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
+                    from: takerAddress,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress);
-            await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, constants.INITIAL_ERC20_ALLOWANCE, {
-                from: takerAddress,
-            });
+            await web3Wrapper.awaitTransactionMinedAsync(
+                await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, constants.INITIAL_ERC20_ALLOWANCE, {
+                    from: takerAddress,
+                }),
+                constants.AWAIT_TRANSACTION_MINED_MS,
+            );
 
             const newBalances = await erc20Wrapper.getBalancesAsync();
             expect(newBalances).to.be.deep.equal(erc20Balances);
@@ -620,7 +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
@@ -663,7 +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);
             });
@@ -709,7 +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
@@ -752,7 +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);
             });
@@ -798,7 +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
@@ -841,7 +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);
             });
@@ -887,7 +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
@@ -930,7 +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);
             });
diff --git a/packages/contracts/test/global_hooks.ts b/packages/contracts/test/global_hooks.ts
index 089521d94..8b48b030d 100644
--- a/packages/contracts/test/global_hooks.ts
+++ b/packages/contracts/test/global_hooks.ts
@@ -1,4 +1,6 @@
-import { coverage, env, EnvVars } from '@0xproject/dev-utils';
+import { env, EnvVars } from '@0xproject/dev-utils';
+
+import { coverage } from '../src/utils/coverage';
 
 after('generate coverage report', async () => {
     if (env.parseBoolean(EnvVars.SolidityCoverage)) {
diff --git a/packages/contracts/test/libraries/lib_bytes.ts b/packages/contracts/test/libraries/lib_bytes.ts
index 5ed5c356f..ce3adbdae 100644
--- a/packages/contracts/test/libraries/lib_bytes.ts
+++ b/packages/contracts/test/libraries/lib_bytes.ts
@@ -1,5 +1,5 @@
-import { LogWithDecodedArgs, TransactionReceiptWithDecodedLogs, ZeroEx } from '0x.js';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
+import { LogWithDecodedArgs, TransactionReceiptWithDecodedLogs } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import BN = require('bn.js');
@@ -33,6 +33,12 @@ describe('LibBytes', () => {
     const testUint256 = new BigNumber(testBytes32, 16);
 
     before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    before(async () => {
         // Setup accounts & addresses
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         owner = accounts[0];
diff --git a/packages/contracts/test/multi_sig_with_time_lock.ts b/packages/contracts/test/multi_sig_with_time_lock.ts
index 8e58006ac..6f18de3e7 100644
--- a/packages/contracts/test/multi_sig_with_time_lock.ts
+++ b/packages/contracts/test/multi_sig_with_time_lock.ts
@@ -1,5 +1,5 @@
-import { LogWithDecodedArgs, ZeroEx } from '0x.js';
 import { BlockchainLifecycle, web3Factory } from '@0xproject/dev-utils';
+import { LogWithDecodedArgs } from '@0xproject/types';
 import { AbiDecoder, BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
@@ -20,7 +20,6 @@ const MULTI_SIG_ABI = artifacts.MultiSigWalletWithTimeLock.compilerOutput.abi;
 chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-const zeroEx = new ZeroEx(provider, { networkId: constants.TESTRPC_NETWORK_ID });
 const abiDecoder = new AbiDecoder([MULTI_SIG_ABI]);
 
 describe('MultiSigWalletWithTimeLock', () => {
@@ -45,6 +44,12 @@ describe('MultiSigWalletWithTimeLock', () => {
 
     describe('changeTimeLock', () => {
         describe('initially non-time-locked', async () => {
+            before(async () => {
+                await blockchainLifecycle.startAsync();
+            });
+            after(async () => {
+                await blockchainLifecycle.revertAsync();
+            });
             before('deploy a wallet', async () => {
                 multiSig = await MultiSigWalletWithTimeLockContract.deployFrom0xArtifactAsync(
                     artifacts.MultiSigWalletWithTimeLock,
@@ -74,8 +79,11 @@ describe('MultiSigWalletWithTimeLock', () => {
                     args: [SECONDS_TIME_LOCKED.toNumber()],
                 };
                 const txHash = await multiSigWrapper.submitTransactionAsync(destination, from, dataParams);
-                const subRes = await zeroEx.awaitTransactionMinedAsync(txHash);
-                const log = abiDecoder.tryToDecodeLogOrNoop(subRes.logs[0]) as LogWithDecodedArgs<
+                const txReceipt = await web3Wrapper.awaitTransactionMinedAsync(
+                    txHash,
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
+                const log = abiDecoder.tryToDecodeLogOrNoop(txReceipt.logs[0]) as LogWithDecodedArgs<
                     SubmissionContractEventArgs
                 >;
 
@@ -94,14 +102,17 @@ describe('MultiSigWalletWithTimeLock', () => {
                     args: [SECONDS_TIME_LOCKED.toNumber()],
                 };
                 let txHash = await multiSigWrapper.submitTransactionAsync(destination, from, dataParams);
-                const subRes = await zeroEx.awaitTransactionMinedAsync(txHash);
-                const log = abiDecoder.tryToDecodeLogOrNoop(subRes.logs[0]) as LogWithDecodedArgs<
+                const txReceipt = await web3Wrapper.awaitTransactionMinedAsync(
+                    txHash,
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
+                const log = abiDecoder.tryToDecodeLogOrNoop(txReceipt.logs[0]) as LogWithDecodedArgs<
                     SubmissionContractEventArgs
                 >;
 
                 txId = log.args.transactionId;
                 txHash = await multiSig.confirmTransaction.sendTransactionAsync(txId, { from: owners[1] });
-                const res = await zeroEx.awaitTransactionMinedAsync(txHash);
+                const res = await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
                 expect(res.logs).to.have.length(2);
 
                 const blockNum = await web3Wrapper.getBlockNumberAsync();
@@ -121,18 +132,22 @@ describe('MultiSigWalletWithTimeLock', () => {
                     args: [SECONDS_TIME_LOCKED.toNumber()],
                 };
                 let txHash = await multiSigWrapper.submitTransactionAsync(destination, from, dataParams);
-                const subRes = await zeroEx.awaitTransactionMinedAsync(txHash);
-                const log = abiDecoder.tryToDecodeLogOrNoop(subRes.logs[0]) as LogWithDecodedArgs<
+                const txReceipt = await web3Wrapper.awaitTransactionMinedAsync(
+                    txHash,
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
+                const log = abiDecoder.tryToDecodeLogOrNoop(txReceipt.logs[0]) as LogWithDecodedArgs<
                     SubmissionContractEventArgs
                 >;
 
                 txId = log.args.transactionId;
                 txHash = await multiSig.confirmTransaction.sendTransactionAsync(txId, { from: owners[1] });
+                await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
 
                 expect(initialSecondsTimeLocked).to.be.equal(0);
 
                 txHash = await multiSig.executeTransaction.sendTransactionAsync(txId, { from: owners[0] });
-                const res = await zeroEx.awaitTransactionMinedAsync(txHash);
+                const res = await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
                 expect(res.logs).to.have.length(2);
 
                 const secondsTimeLocked = new BigNumber(await multiSig.secondsTimeLocked.callAsync());
@@ -140,6 +155,12 @@ describe('MultiSigWalletWithTimeLock', () => {
             });
         });
         describe('initially time-locked', async () => {
+            before(async () => {
+                await blockchainLifecycle.startAsync();
+            });
+            after(async () => {
+                await blockchainLifecycle.revertAsync();
+            });
             before('deploy a wallet', async () => {
                 multiSig = await MultiSigWalletWithTimeLockContract.deployFrom0xArtifactAsync(
                     artifacts.MultiSigWalletWithTimeLock,
@@ -161,16 +182,19 @@ describe('MultiSigWalletWithTimeLock', () => {
                     args: [newSecondsTimeLocked],
                 };
                 let txHash = await multiSigWrapper.submitTransactionAsync(destination, from, dataParams);
-                const subRes = await zeroEx.awaitTransactionMinedAsync(txHash);
-                const log = abiDecoder.tryToDecodeLogOrNoop(subRes.logs[0]) as LogWithDecodedArgs<
+                let txReceipt = await web3Wrapper.awaitTransactionMinedAsync(
+                    txHash,
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
+                const log = abiDecoder.tryToDecodeLogOrNoop(txReceipt.logs[0]) as LogWithDecodedArgs<
                     SubmissionContractEventArgs
                 >;
                 txId = log.args.transactionId;
                 txHash = await multiSig.confirmTransaction.sendTransactionAsync(txId, {
                     from: owners[1],
                 });
-                const confRes = await zeroEx.awaitTransactionMinedAsync(txHash);
-                expect(confRes.logs).to.have.length(2);
+                txReceipt = await web3Wrapper.awaitTransactionMinedAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
+                expect(txReceipt.logs).to.have.length(2);
             });
             const newSecondsTimeLocked = 0;
             it('should throw if it has enough confirmations but is not past the time lock', async () => {
@@ -181,7 +205,10 @@ describe('MultiSigWalletWithTimeLock', () => {
 
             it('should execute if it has enough confirmations and is past the time lock', async () => {
                 await web3Wrapper.increaseTimeAsync(SECONDS_TIME_LOCKED.toNumber());
-                await multiSig.executeTransaction.sendTransactionAsync(txId, { from: owners[0] });
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await multiSig.executeTransaction.sendTransactionAsync(txId, { from: owners[0] }),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
 
                 const secondsTimeLocked = new BigNumber(await multiSig.secondsTimeLocked.callAsync());
                 expect(secondsTimeLocked).to.be.bignumber.equal(newSecondsTimeLocked);
diff --git a/packages/contracts/test/token_registry.ts b/packages/contracts/test/token_registry.ts
index 9e4f7ca3b..49d4f3901 100644
--- a/packages/contracts/test/token_registry.ts
+++ b/packages/contracts/test/token_registry.ts
@@ -1,4 +1,3 @@
-import { ZeroEx } from '0x.js';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber, NULL_BYTES } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -25,6 +24,12 @@ describe('TokenRegistry', () => {
     let tokenReg: TokenRegistryContract;
     let tokenRegWrapper: TokenRegWrapper;
     before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         owner = accounts[0];
         notOwner = accounts[1];
@@ -60,7 +65,7 @@ describe('TokenRegistry', () => {
     };
 
     const nullToken = {
-        address: ZeroEx.NULL_ADDRESS,
+        address: constants.NULL_ADDRESS,
         name: '',
         symbol: '',
         decimals: 0,
@@ -137,9 +142,12 @@ describe('TokenRegistry', () => {
             });
 
             it('should change the token name when called by owner', async () => {
-                await tokenReg.setTokenName.sendTransactionAsync(token1.address, token2.name, {
-                    from: owner,
-                });
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await tokenReg.setTokenName.sendTransactionAsync(token1.address, token2.name, {
+                        from: owner,
+                    }),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
                 const [newData, oldData] = await Promise.all([
                     tokenRegWrapper.getTokenByNameAsync(token2.name),
                     tokenRegWrapper.getTokenByNameAsync(token1.name),
@@ -176,7 +184,10 @@ describe('TokenRegistry', () => {
             });
 
             it('should change the token symbol when called by owner', async () => {
-                await tokenReg.setTokenSymbol.sendTransactionAsync(token1.address, token2.symbol, { from: owner });
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await tokenReg.setTokenSymbol.sendTransactionAsync(token1.address, token2.symbol, { from: owner }),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
                 const [newData, oldData] = await Promise.all([
                     tokenRegWrapper.getTokenBySymbolAsync(token2.symbol),
                     tokenRegWrapper.getTokenBySymbolAsync(token1.symbol),
@@ -217,9 +228,12 @@ describe('TokenRegistry', () => {
 
             it('should remove token metadata when called by owner', async () => {
                 const index = new BigNumber(0);
-                await tokenReg.removeToken.sendTransactionAsync(token1.address, index, {
-                    from: owner,
-                });
+                await web3Wrapper.awaitTransactionMinedAsync(
+                    await tokenReg.removeToken.sendTransactionAsync(token1.address, index, {
+                        from: owner,
+                    }),
+                    constants.AWAIT_TRANSACTION_MINED_MS,
+                );
                 const tokenData = await tokenRegWrapper.getTokenMetaDataAsync(token1.address);
                 expect(tokenData).to.be.deep.equal(nullToken);
             });
diff --git a/packages/contracts/test/tutorials/arbitrage.ts b/packages/contracts/test/tutorials/arbitrage.ts
index 723ddb066..e5787d5b8 100644
--- a/packages/contracts/test/tutorials/arbitrage.ts
+++ b/packages/contracts/test/tutorials/arbitrage.ts
@@ -38,7 +38,7 @@
 //     let amountGive: BigNumber;
 //     let makerTokenAmount: BigNumber;
 //     let takerTokenAmount: BigNumber;
-//     const feeRecipient = ZeroEx.NULL_ADDRESS;
+//     const feeRecipient = constants.NULL_ADDRESS;
 //     const INITIAL_BALANCE = ZeroEx.toBaseUnitAmount(new BigNumber(10000), 18);
 //     const INITIAL_ALLOWANCE = ZeroEx.toBaseUnitAmount(new BigNumber(10000), 18);
 
@@ -115,7 +115,7 @@
 //             exchangeContractAddress: exchange.address,
 //             networkId: constants.TESTRPC_NETWORK_ID,
 //         });
-//         exWrapper = new ExchangeWrapper(exchange, zeroEx);
+//         exWrapper = new ExchangeWrapper(exchange, provider);
 
 //         makerTokenAmount = ZeroEx.toBaseUnitAmount(new BigNumber(1), 18);
 //         takerTokenAmount = makerTokenAmount;
diff --git a/packages/contracts/test/unlimited_allowance_token.ts b/packages/contracts/test/unlimited_allowance_token.ts
index 8851a04ef..e831301e1 100644
--- a/packages/contracts/test/unlimited_allowance_token.ts
+++ b/packages/contracts/test/unlimited_allowance_token.ts
@@ -1,4 +1,4 @@
-import { ZeroEx } from '0x.js';
+import { ContractWrappers } from '@0xproject/contract-wrappers';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -19,7 +19,7 @@ const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 describe('UnlimitedAllowanceToken', () => {
     let owner: string;
     let spender: string;
-    const zeroEx = new ZeroEx(provider, {
+    const contractWrappers = new ContractWrappers(provider, {
         networkId: constants.TESTRPC_NETWORK_ID,
     });
 
@@ -28,6 +28,12 @@ describe('UnlimitedAllowanceToken', () => {
     let token: DummyERC20TokenContract;
 
     before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         owner = accounts[0];
         spender = accounts[1];
@@ -40,7 +46,10 @@ describe('UnlimitedAllowanceToken', () => {
             constants.DUMMY_TOKEN_DECIMALS,
             constants.DUMMY_TOKEN_TOTAL_SUPPLY,
         );
-        await token.mint.sendTransactionAsync(MAX_MINT_VALUE, { from: owner });
+        await web3Wrapper.awaitTransactionMinedAsync(
+            await token.mint.sendTransactionAsync(MAX_MINT_VALUE, { from: owner }),
+            constants.AWAIT_TRANSACTION_MINED_MS,
+        );
         tokenAddress = token.address;
     });
     beforeEach(async () => {
@@ -51,7 +60,7 @@ describe('UnlimitedAllowanceToken', () => {
     });
     describe('transfer', () => {
         it('should throw if owner has insufficient balance', async () => {
-            const ownerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
+            const ownerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
             const amountToTransfer = ownerBalance.plus(1);
             return expect(token.transfer.callAsync(spender, amountToTransfer, { from: owner })).to.be.rejectedWith(
                 constants.REVERT,
@@ -60,11 +69,11 @@ describe('UnlimitedAllowanceToken', () => {
 
         it('should transfer balance from sender to receiver', async () => {
             const receiver = spender;
-            const initOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
+            const initOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
             const amountToTransfer = new BigNumber(1);
-            await zeroEx.token.transferAsync(tokenAddress, owner, receiver, amountToTransfer);
-            const finalOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
-            const finalReceiverBalance = await zeroEx.token.getBalanceAsync(tokenAddress, receiver);
+            await contractWrappers.token.transferAsync(tokenAddress, owner, receiver, amountToTransfer);
+            const finalOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
+            const finalReceiverBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, receiver);
 
             const expectedFinalOwnerBalance = initOwnerBalance.minus(amountToTransfer);
             const expectedFinalReceiverBalance = amountToTransfer;
@@ -82,9 +91,9 @@ describe('UnlimitedAllowanceToken', () => {
 
     describe('transferFrom', () => {
         it('should throw if owner has insufficient balance', async () => {
-            const ownerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
+            const ownerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
             const amountToTransfer = ownerBalance.plus(1);
-            await zeroEx.token.setAllowanceAsync(tokenAddress, owner, spender, amountToTransfer);
+            await contractWrappers.token.setAllowanceAsync(tokenAddress, owner, spender, amountToTransfer);
             return expect(
                 token.transferFrom.callAsync(owner, spender, amountToTransfer, {
                     from: spender,
@@ -93,12 +102,12 @@ describe('UnlimitedAllowanceToken', () => {
         });
 
         it('should throw if spender has insufficient allowance', async () => {
-            const ownerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
+            const ownerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
             const amountToTransfer = ownerBalance;
 
-            const spenderAllowance = await zeroEx.token.getAllowanceAsync(tokenAddress, owner, spender);
-            const spenderAllowanceIsInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
-            expect(spenderAllowanceIsInsufficient).to.be.true();
+            const spenderAllowance = await contractWrappers.token.getAllowanceAsync(tokenAddress, owner, spender);
+            const isSpenderAllowanceInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
+            expect(isSpenderAllowanceInsufficient).to.be.true();
 
             return expect(
                 token.transferFrom.callAsync(owner, spender, amountToTransfer, {
@@ -116,44 +125,44 @@ describe('UnlimitedAllowanceToken', () => {
         });
 
         it('should not modify spender allowance if spender allowance is 2^256 - 1', async () => {
-            const initOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
+            const initOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
             const amountToTransfer = initOwnerBalance;
-            const initSpenderAllowance = zeroEx.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
-            await zeroEx.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance);
-            await zeroEx.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, {
+            const initSpenderAllowance = contractWrappers.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
+            await contractWrappers.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance);
+            await contractWrappers.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, {
                 gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS,
             });
 
-            const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(tokenAddress, owner, spender);
+            const newSpenderAllowance = await contractWrappers.token.getAllowanceAsync(tokenAddress, owner, spender);
             expect(initSpenderAllowance).to.be.bignumber.equal(newSpenderAllowance);
         });
 
         it('should transfer the correct balances if spender has sufficient allowance', async () => {
-            const initOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
+            const initOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
             const amountToTransfer = initOwnerBalance;
             const initSpenderAllowance = initOwnerBalance;
-            await zeroEx.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance);
-            await zeroEx.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, {
+            await contractWrappers.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance);
+            await contractWrappers.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, {
                 gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS,
             });
 
-            const newOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
-            const newSpenderBalance = await zeroEx.token.getBalanceAsync(tokenAddress, spender);
+            const newOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
+            const newSpenderBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, spender);
 
             expect(newOwnerBalance).to.be.bignumber.equal(0);
             expect(newSpenderBalance).to.be.bignumber.equal(initOwnerBalance);
         });
 
         it('should modify allowance if spender has sufficient allowance less than 2^256 - 1', async () => {
-            const initOwnerBalance = await zeroEx.token.getBalanceAsync(tokenAddress, owner);
+            const initOwnerBalance = await contractWrappers.token.getBalanceAsync(tokenAddress, owner);
             const amountToTransfer = initOwnerBalance;
             const initSpenderAllowance = initOwnerBalance;
-            await zeroEx.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance);
-            await zeroEx.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, {
+            await contractWrappers.token.setAllowanceAsync(tokenAddress, owner, spender, initSpenderAllowance);
+            await contractWrappers.token.transferFromAsync(tokenAddress, owner, spender, spender, amountToTransfer, {
                 gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS,
             });
 
-            const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(tokenAddress, owner, spender);
+            const newSpenderAllowance = await contractWrappers.token.getAllowanceAsync(tokenAddress, owner, spender);
             expect(newSpenderAllowance).to.be.bignumber.equal(0);
         });
     });
diff --git a/packages/contracts/test/zrx_token.ts b/packages/contracts/test/zrx_token.ts
index 7a72f85dc..e632364ef 100644
--- a/packages/contracts/test/zrx_token.ts
+++ b/packages/contracts/test/zrx_token.ts
@@ -1,4 +1,4 @@
-import { ZeroEx } from '0x.js';
+import { ContractWrappers } from '@0xproject/contract-wrappers';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -19,7 +19,7 @@ const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 describe('ZRXToken', () => {
     let owner: string;
     let spender: string;
-    let zeroEx: ZeroEx;
+    let contractWrappers: ContractWrappers;
 
     let MAX_UINT: BigNumber;
 
@@ -27,15 +27,21 @@ describe('ZRXToken', () => {
     let zrxAddress: string;
 
     before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         owner = accounts[0];
         spender = accounts[1];
-        zeroEx = new ZeroEx(provider, {
+        contractWrappers = new ContractWrappers(provider, {
             networkId: constants.TESTRPC_NETWORK_ID,
         });
         zrxToken = await ZRXTokenContract.deployFrom0xArtifactAsync(artifacts.ZRX, provider, txDefaults);
         zrxAddress = zrxToken.address;
-        MAX_UINT = zeroEx.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
+        MAX_UINT = contractWrappers.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
     });
     beforeEach(async () => {
         await blockchainLifecycle.startAsync();
@@ -53,7 +59,7 @@ describe('ZRXToken', () => {
         it('should have a total supply of 1 billion tokens', async () => {
             const totalSupply = new BigNumber(await zrxToken.totalSupply.callAsync());
             const expectedTotalSupply = 1000000000;
-            expect(ZeroEx.toUnitAmount(totalSupply, 18)).to.be.bignumber.equal(expectedTotalSupply);
+            expect(Web3Wrapper.toUnitAmount(totalSupply, 18)).to.be.bignumber.equal(expectedTotalSupply);
         });
 
         it('should be named 0x Protocol Token', async () => {
@@ -71,7 +77,7 @@ describe('ZRXToken', () => {
 
     describe('constructor', () => {
         it('should initialize owner balance to totalSupply', async () => {
-            const ownerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
+            const ownerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
             const totalSupply = new BigNumber(await zrxToken.totalSupply.callAsync());
             expect(totalSupply).to.be.bignumber.equal(ownerBalance);
         });
@@ -80,11 +86,11 @@ describe('ZRXToken', () => {
     describe('transfer', () => {
         it('should transfer balance from sender to receiver', async () => {
             const receiver = spender;
-            const initOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
+            const initOwnerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
             const amountToTransfer = new BigNumber(1);
-            await zeroEx.token.transferAsync(zrxAddress, owner, receiver, amountToTransfer);
-            const finalOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
-            const finalReceiverBalance = await zeroEx.token.getBalanceAsync(zrxAddress, receiver);
+            await contractWrappers.token.transferAsync(zrxAddress, owner, receiver, amountToTransfer);
+            const finalOwnerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
+            const finalReceiverBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, receiver);
 
             const expectedFinalOwnerBalance = initOwnerBalance.minus(amountToTransfer);
             const expectedFinalReceiverBalance = amountToTransfer;
@@ -102,9 +108,9 @@ describe('ZRXToken', () => {
 
     describe('transferFrom', () => {
         it('should return false if owner has insufficient balance', async () => {
-            const ownerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
+            const ownerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
             const amountToTransfer = ownerBalance.plus(1);
-            await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, amountToTransfer, {
+            await contractWrappers.token.setAllowanceAsync(zrxAddress, owner, spender, amountToTransfer, {
                 gasLimit: constants.MAX_TOKEN_APPROVE_GAS,
             });
             const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, {
@@ -114,12 +120,12 @@ describe('ZRXToken', () => {
         });
 
         it('should return false if spender has insufficient allowance', async () => {
-            const ownerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
+            const ownerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
             const amountToTransfer = ownerBalance;
 
-            const spenderAllowance = await zeroEx.token.getAllowanceAsync(zrxAddress, owner, spender);
-            const spenderAllowanceIsInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
-            expect(spenderAllowanceIsInsufficient).to.be.true();
+            const spenderAllowance = await contractWrappers.token.getAllowanceAsync(zrxAddress, owner, spender);
+            const isSpenderAllowanceInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
+            expect(isSpenderAllowanceInsufficient).to.be.true();
 
             const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, {
                 from: spender,
@@ -136,46 +142,46 @@ describe('ZRXToken', () => {
         });
 
         it('should not modify spender allowance if spender allowance is 2^256 - 1', async () => {
-            const initOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
+            const initOwnerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
             const amountToTransfer = initOwnerBalance;
             const initSpenderAllowance = MAX_UINT;
-            await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, initSpenderAllowance, {
+            await contractWrappers.token.setAllowanceAsync(zrxAddress, owner, spender, initSpenderAllowance, {
                 gasLimit: constants.MAX_TOKEN_APPROVE_GAS,
             });
-            await zeroEx.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer, {
+            await contractWrappers.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer, {
                 gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS,
             });
 
-            const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(zrxAddress, owner, spender);
+            const newSpenderAllowance = await contractWrappers.token.getAllowanceAsync(zrxAddress, owner, spender);
             expect(initSpenderAllowance).to.be.bignumber.equal(newSpenderAllowance);
         });
 
         it('should transfer the correct balances if spender has sufficient allowance', async () => {
-            const initOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
-            const initSpenderBalance = await zeroEx.token.getBalanceAsync(zrxAddress, spender);
+            const initOwnerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
+            const initSpenderBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, spender);
             const amountToTransfer = initOwnerBalance;
             const initSpenderAllowance = initOwnerBalance;
-            await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, initSpenderAllowance);
-            await zeroEx.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer, {
+            await contractWrappers.token.setAllowanceAsync(zrxAddress, owner, spender, initSpenderAllowance);
+            await contractWrappers.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer, {
                 gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS,
             });
 
-            const newOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
-            const newSpenderBalance = await zeroEx.token.getBalanceAsync(zrxAddress, spender);
+            const newOwnerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
+            const newSpenderBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, spender);
 
             expect(newOwnerBalance).to.be.bignumber.equal(0);
             expect(newSpenderBalance).to.be.bignumber.equal(initSpenderBalance.plus(initOwnerBalance));
         });
 
         it('should modify allowance if spender has sufficient allowance less than 2^256 - 1', async () => {
-            const initOwnerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
+            const initOwnerBalance = await contractWrappers.token.getBalanceAsync(zrxAddress, owner);
             const amountToTransfer = initOwnerBalance;
-            await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, amountToTransfer);
-            await zeroEx.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer, {
+            await contractWrappers.token.setAllowanceAsync(zrxAddress, owner, spender, amountToTransfer);
+            await contractWrappers.token.transferFromAsync(zrxAddress, owner, spender, spender, amountToTransfer, {
                 gasLimit: constants.MAX_TOKEN_TRANSFERFROM_GAS,
             });
 
-            const newSpenderAllowance = await zeroEx.token.getAllowanceAsync(zrxAddress, owner, spender);
+            const newSpenderAllowance = await contractWrappers.token.getAllowanceAsync(zrxAddress, owner, spender);
             expect(newSpenderAllowance).to.be.bignumber.equal(0);
         });
     });
diff --git a/packages/contracts/tslint.json b/packages/contracts/tslint.json
index ffaefe83a..1ab924e47 100644
--- a/packages/contracts/tslint.json
+++ b/packages/contracts/tslint.json
@@ -1,3 +1,6 @@
 {
-    "extends": ["@0xproject/tslint-config"]
+    "extends": ["@0xproject/tslint-config"],
+    "rules": {
+        "custom-no-magic-numbers": false
+    }
 }