Rename variables, create private validation methods in token wrappers

8 files changed, 308 insertions, 286 deletions

diff --git a/packages/contracts/src/utils/erc20_wrapper.ts b/packages/contracts/src/utils/erc20_wrapper.ts
index 212a639ff..c2effb617 100644
--- a/packages/contracts/src/utils/erc20_wrapper.ts
+++ b/packages/contracts/src/utils/erc20_wrapper.ts
@@ -14,57 +14,53 @@ export class ERC20Wrapper {
     private _contractOwnerAddress: string;
     private _deployer: Deployer;
     private _provider: Provider;
-    private _dummyERC20TokenContracts?: DummyERC20TokenContract[];
-    private _erc20ProxyContract?: ERC20ProxyContract;
+    private _dummyTokenContracts?: DummyERC20TokenContract[];
+    private _proxyContract?: ERC20ProxyContract;
     constructor(deployer: Deployer, provider: Provider, tokenOwnerAddresses: string[], contractOwnerAddress: string) {
         this._deployer = deployer;
         this._provider = provider;
         this._tokenOwnerAddresses = tokenOwnerAddresses;
         this._contractOwnerAddress = contractOwnerAddress;
     }
-    public async deployDummyERC20TokensAsync(): Promise<DummyERC20TokenContract[]> {
+    public async deployDummyTokensAsync(): Promise<DummyERC20TokenContract[]> {
         const tokenContractInstances = await Promise.all(
-            _.map(_.range(constants.NUM_DUMMY_ERC20_TO_DEPLOY), () =>
+            _.times(constants.NUM_DUMMY_ERC20_TO_DEPLOY, () =>
                 this._deployer.deployAsync(ContractName.DummyERC20Token, constants.DUMMY_ERC20_TOKEN_ARGS),
             ),
         );
-        this._dummyERC20TokenContracts = _.map(
+        this._dummyTokenContracts = _.map(
             tokenContractInstances,
             tokenContractInstance =>
                 new DummyERC20TokenContract(tokenContractInstance.abi, tokenContractInstance.address, this._provider),
         );
-        return this._dummyERC20TokenContracts;
+        return this._dummyTokenContracts;
     }
-    public async deployERC20ProxyAsync(): Promise<ERC20ProxyContract> {
+    public async deployProxyAsync(): Promise<ERC20ProxyContract> {
         const proxyContractInstance = await this._deployer.deployAsync(ContractName.ERC20Proxy);
-        this._erc20ProxyContract = new ERC20ProxyContract(
+        this._proxyContract = new ERC20ProxyContract(
             proxyContractInstance.abi,
             proxyContractInstance.address,
             this._provider,
         );
-        return this._erc20ProxyContract;
+        return this._proxyContract;
     }
     public async setBalancesAndAllowancesAsync() {
-        if (_.isUndefined(this._dummyERC20TokenContracts)) {
-            throw new Error('Dummy ERC20 tokens not yet deployed, please call "deployDummyERC20TokensAsync"');
-        }
-        if (_.isUndefined(this._erc20ProxyContract)) {
-            throw new Error('ERC20 proxy contract not yet deployed, please call "deployERC20ProxyAsync"');
-        }
-        const setBalancePromises: any[] = [];
-        const setAllowancePromises: any[] = [];
-        _.forEach(this._dummyERC20TokenContracts, dummyERC20TokenContract => {
+        this._validateDummyTokenContractsExistOrThrow();
+        this._validateProxyContractExistsOrThrow();
+        const setBalancePromises: Array<Promise<string>> = [];
+        const setAllowancePromises: Array<Promise<string>> = [];
+        _.forEach(this._dummyTokenContracts, dummyTokenContract => {
             _.forEach(this._tokenOwnerAddresses, tokenOwnerAddress => {
                 setBalancePromises.push(
-                    dummyERC20TokenContract.setBalance.sendTransactionAsync(
+                    dummyTokenContract.setBalance.sendTransactionAsync(
                         tokenOwnerAddress,
                         constants.INITIAL_ERC20_BALANCE,
                         { from: this._contractOwnerAddress },
                     ),
                 );
                 setAllowancePromises.push(
-                    dummyERC20TokenContract.approve.sendTransactionAsync(
-                        (this._erc20ProxyContract as ERC20ProxyContract).address,
+                    dummyTokenContract.approve.sendTransactionAsync(
+                        (this._proxyContract as ERC20ProxyContract).address,
                         constants.INITIAL_ERC20_ALLOWANCE,
                         { from: tokenOwnerAddress },
                     ),
@@ -74,18 +70,16 @@ export class ERC20Wrapper {
         await Promise.all([...setBalancePromises, ...setAllowancePromises]);
     }
     public async getBalancesAsync(): Promise<ERC20BalancesByOwner> {
-        if (_.isUndefined(this._dummyERC20TokenContracts)) {
-            throw new Error('Dummy ERC20 tokens not yet deployed, please call "deployDummyTokensAsync"');
-        }
+        this._validateDummyTokenContractsExistOrThrow();
         const balancesByOwner: ERC20BalancesByOwner = {};
-        const balancePromises: any[] = [];
+        const balancePromises: Array<Promise<BigNumber>> = [];
         const balanceInfo: Array<{ tokenOwnerAddress: string; tokenAddress: string }> = [];
-        _.forEach(this._dummyERC20TokenContracts, dummyERC20TokenContract => {
+        _.forEach(this._dummyTokenContracts, dummyTokenContract => {
             _.forEach(this._tokenOwnerAddresses, tokenOwnerAddress => {
-                balancePromises.push(dummyERC20TokenContract.balanceOf.callAsync(tokenOwnerAddress));
+                balancePromises.push(dummyTokenContract.balanceOf.callAsync(tokenOwnerAddress));
                 balanceInfo.push({
                     tokenOwnerAddress,
-                    tokenAddress: dummyERC20TokenContract.address,
+                    tokenAddress: dummyTokenContract.address,
                 });
             });
         });
@@ -105,10 +99,17 @@ export class ERC20Wrapper {
         return this._tokenOwnerAddresses;
     }
     public getTokenAddresses(): string[] {
-        const tokenAddresses = _.map(
-            this._dummyERC20TokenContracts,
-            dummyERC20TokenContract => dummyERC20TokenContract.address,
-        );
+        const tokenAddresses = _.map(this._dummyTokenContracts, dummyTokenContract => dummyTokenContract.address);
         return tokenAddresses;
     }
+    private _validateDummyTokenContractsExistOrThrow() {
+        if (_.isUndefined(this._dummyTokenContracts)) {
+            throw new Error('Dummy ERC20 tokens not yet deployed, please call "deployDummyTokensAsync"');
+        }
+    }
+    private _validateProxyContractExistsOrThrow() {
+        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 0c62fd5d9..b78b76b51 100644
--- a/packages/contracts/src/utils/erc721_wrapper.ts
+++ b/packages/contracts/src/utils/erc721_wrapper.ts
@@ -8,84 +8,74 @@ import { DummyERC721TokenContract } from '../contract_wrappers/generated/dummy_e
 import { ERC721ProxyContract } from '../contract_wrappers/generated/e_r_c721_proxy';
 
 import { constants } from './constants';
-import { ContractName, ERC721BalancesByOwner } from './types';
+import { ContractName, ERC721TokenIdsByOwner } from './types';
 
 export class ERC721Wrapper {
     private _tokenOwnerAddresses: string[];
     private _contractOwnerAddress: string;
     private _deployer: Deployer;
     private _provider: Provider;
-    private _dummyERC721TokenContracts?: DummyERC721TokenContract[];
-    private _erc721ProxyContract?: ERC721ProxyContract;
-    private _initialERC721BalancesByOwner: ERC721BalancesByOwner = {};
+    private _dummyTokenContracts?: DummyERC721TokenContract[];
+    private _proxyContract?: ERC721ProxyContract;
+    private _initialTokenIdsByOwner: ERC721TokenIdsByOwner = {};
     constructor(deployer: Deployer, provider: Provider, tokenOwnerAddresses: string[], contractOwnerAddress: string) {
         this._deployer = deployer;
         this._provider = provider;
         this._tokenOwnerAddresses = tokenOwnerAddresses;
         this._contractOwnerAddress = contractOwnerAddress;
     }
-    public async deployDummyERC721TokensAsync(): Promise<DummyERC721TokenContract[]> {
+    public async deployDummyTokensAsync(): Promise<DummyERC721TokenContract[]> {
         const tokenContractInstances = await Promise.all(
-            _.map(_.range(constants.NUM_DUMMY_ERC721_TO_DEPLOY), () =>
+            _.times(constants.NUM_DUMMY_ERC721_TO_DEPLOY, () =>
                 this._deployer.deployAsync(ContractName.DummyERC721Token, constants.DUMMY_ERC721_TOKEN_ARGS),
             ),
         );
-        this._dummyERC721TokenContracts = _.map(
+        this._dummyTokenContracts = _.map(
             tokenContractInstances,
             tokenContractInstance =>
                 new DummyERC721TokenContract(tokenContractInstance.abi, tokenContractInstance.address, this._provider),
         );
-        return this._dummyERC721TokenContracts;
+        return this._dummyTokenContracts;
     }
-    public async deployERC721ProxyAsync(): Promise<ERC721ProxyContract> {
+    public async deployProxyAsync(): Promise<ERC721ProxyContract> {
         const proxyContractInstance = await this._deployer.deployAsync(ContractName.ERC721Proxy);
-        this._erc721ProxyContract = new ERC721ProxyContract(
+        this._proxyContract = new ERC721ProxyContract(
             proxyContractInstance.abi,
             proxyContractInstance.address,
             this._provider,
         );
-        return this._erc721ProxyContract;
+        return this._proxyContract;
     }
     public async setBalancesAndAllowancesAsync() {
-        if (_.isUndefined(this._dummyERC721TokenContracts)) {
-            throw new Error('Dummy ERC721 tokens not yet deployed, please call "deployDummyERC721TokensAsync"');
-        }
-        if (_.isUndefined(this._erc721ProxyContract)) {
-            throw new Error('ERC721 proxy contract not yet deployed, please call "deployERC721ProxyAsync"');
-        }
-        const setBalancePromises: any[] = [];
-        const setAllowancePromises: any[] = [];
-        this._initialERC721BalancesByOwner = {};
-        _.forEach(this._dummyERC721TokenContracts, dummyERC721TokenContract => {
+        this._validateDummyTokenContractsExistOrThrow();
+        this._validateProxyContractExistsOrThrow();
+        const setBalancePromises: Array<Promise<string>> = [];
+        const setAllowancePromises: Array<Promise<string>> = [];
+        this._initialTokenIdsByOwner = {};
+        _.forEach(this._dummyTokenContracts, dummyTokenContract => {
             _.forEach(this._tokenOwnerAddresses, tokenOwnerAddress => {
                 _.forEach(_.range(constants.NUM_ERC721_TOKENS_TO_MINT), () => {
                     const tokenId = ZeroEx.generatePseudoRandomSalt();
                     setBalancePromises.push(
-                        dummyERC721TokenContract.mint.sendTransactionAsync(tokenOwnerAddress, tokenId, {
+                        dummyTokenContract.mint.sendTransactionAsync(tokenOwnerAddress, tokenId, {
                             from: this._contractOwnerAddress,
                         }),
                     );
-                    if (_.isUndefined(this._initialERC721BalancesByOwner[tokenOwnerAddress])) {
-                        this._initialERC721BalancesByOwner[tokenOwnerAddress] = {
-                            [dummyERC721TokenContract.address]: [],
+                    if (_.isUndefined(this._initialTokenIdsByOwner[tokenOwnerAddress])) {
+                        this._initialTokenIdsByOwner[tokenOwnerAddress] = {
+                            [dummyTokenContract.address]: [],
                         };
                     }
-                    if (
-                        _.isUndefined(
-                            this._initialERC721BalancesByOwner[tokenOwnerAddress][dummyERC721TokenContract.address],
-                        )
-                    ) {
-                        this._initialERC721BalancesByOwner[tokenOwnerAddress][dummyERC721TokenContract.address] = [];
+                    if (_.isUndefined(this._initialTokenIdsByOwner[tokenOwnerAddress][dummyTokenContract.address])) {
+                        this._initialTokenIdsByOwner[tokenOwnerAddress][dummyTokenContract.address] = [];
                     }
-                    this._initialERC721BalancesByOwner[tokenOwnerAddress][dummyERC721TokenContract.address].push(
-                        tokenId,
-                    );
+                    this._initialTokenIdsByOwner[tokenOwnerAddress][dummyTokenContract.address].push(tokenId);
                 });
-                const approval = true;
+                const shouldApprove = true;
                 setAllowancePromises.push(
-                    dummyERC721TokenContract.setApprovalForAll.sendTransactionAsync(
-                        (this._erc721ProxyContract as ERC721ProxyContract).address,
-                        approval,
+                    dummyTokenContract.setApprovalForAll.sendTransactionAsync(
+                        (this._proxyContract as ERC721ProxyContract).address,
+                        shouldApprove,
                         { from: tokenOwnerAddress },
                     ),
                 );
@@ -93,28 +83,22 @@ export class ERC721Wrapper {
         });
         await Promise.all([...setBalancePromises, ...setAllowancePromises]);
     }
-    public async getBalancesAsync(): Promise<ERC721BalancesByOwner> {
-        if (_.isUndefined(this._dummyERC721TokenContracts)) {
-            throw new Error('Dummy ERC721 tokens not yet deployed, please call "deployDummyERC721TokensAsync"');
-        }
-        if (_.keys(this._initialERC721BalancesByOwner).length === 0) {
-            throw new Error(
-                'Dummy ERC721 balances and allowances not yet set, please call "setBalancesAndAllowancesAsync"',
-            );
-        }
-        const balancesByOwner: ERC721BalancesByOwner = {};
-        const tokenOwnerPromises: any[] = [];
+    public async getBalancesAsync(): Promise<ERC721TokenIdsByOwner> {
+        this._validateDummyTokenContractsExistOrThrow();
+        this._validateBalancesAndAllowancesSetOrThrow();
+        const tokenIdsByOwner: ERC721TokenIdsByOwner = {};
+        const tokenOwnerPromises: Array<Promise<string>> = [];
         const tokenInfo: Array<{ tokenId: BigNumber; tokenAddress: string }> = [];
-        _.forEach(this._dummyERC721TokenContracts, dummyERC721TokenContract => {
+        _.forEach(this._dummyTokenContracts, dummyTokenContract => {
             _.forEach(this._tokenOwnerAddresses, tokenOwnerAddress => {
-                const initialTokenOwnerIds = this._initialERC721BalancesByOwner[tokenOwnerAddress][
-                    dummyERC721TokenContract.address
+                const initialTokenOwnerIds = this._initialTokenIdsByOwner[tokenOwnerAddress][
+                    dummyTokenContract.address
                 ];
                 _.forEach(initialTokenOwnerIds, tokenId => {
-                    tokenOwnerPromises.push(dummyERC721TokenContract.ownerOf.callAsync(tokenId));
+                    tokenOwnerPromises.push(dummyTokenContract.ownerOf.callAsync(tokenId));
                     tokenInfo.push({
                         tokenId,
-                        tokenAddress: dummyERC721TokenContract.address,
+                        tokenAddress: dummyTokenContract.address,
                     });
                 });
             });
@@ -123,26 +107,40 @@ export class ERC721Wrapper {
         _.forEach(tokenOwnerAddresses, (tokenOwnerAddress, ownerIndex) => {
             const tokenAddress = tokenInfo[ownerIndex].tokenAddress;
             const tokenId = tokenInfo[ownerIndex].tokenId;
-            if (_.isUndefined(balancesByOwner[tokenOwnerAddress])) {
-                balancesByOwner[tokenOwnerAddress] = {
+            if (_.isUndefined(tokenIdsByOwner[tokenOwnerAddress])) {
+                tokenIdsByOwner[tokenOwnerAddress] = {
                     [tokenAddress]: [],
                 };
             }
-            if (_.isUndefined(balancesByOwner[tokenOwnerAddress][tokenAddress])) {
-                balancesByOwner[tokenOwnerAddress][tokenAddress] = [];
+            if (_.isUndefined(tokenIdsByOwner[tokenOwnerAddress][tokenAddress])) {
+                tokenIdsByOwner[tokenOwnerAddress][tokenAddress] = [];
             }
-            balancesByOwner[tokenOwnerAddress][tokenAddress].push(tokenId);
+            tokenIdsByOwner[tokenOwnerAddress][tokenAddress].push(tokenId);
         });
-        return balancesByOwner;
+        return tokenIdsByOwner;
     }
     public getTokenOwnerAddresses(): string[] {
         return this._tokenOwnerAddresses;
     }
     public getTokenAddresses(): string[] {
-        const tokenAddresses = _.map(
-            this._dummyERC721TokenContracts,
-            dummyERC721TokenContract => dummyERC721TokenContract.address,
-        );
+        const tokenAddresses = _.map(this._dummyTokenContracts, dummyTokenContract => dummyTokenContract.address);
         return tokenAddresses;
     }
+    private _validateDummyTokenContractsExistOrThrow() {
+        if (_.isUndefined(this._dummyTokenContracts)) {
+            throw new Error('Dummy ERC721 tokens not yet deployed, please call "deployDummyTokensAsync"');
+        }
+    }
+    private _validateProxyContractExistsOrThrow() {
+        if (_.isUndefined(this._proxyContract)) {
+            throw new Error('ERC721 proxy contract not yet deployed, please call "deployProxyAsync"');
+        }
+    }
+    private _validateBalancesAndAllowancesSetOrThrow() {
+        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/types.ts b/packages/contracts/src/utils/types.ts
index 629187e95..1e3cd5b9a 100644
--- a/packages/contracts/src/utils/types.ts
+++ b/packages/contracts/src/utils/types.ts
@@ -7,7 +7,7 @@ export interface ERC20BalancesByOwner {
     };
 }
 
-export interface ERC721BalancesByOwner {
+export interface ERC721TokenIdsByOwner {
     [ownerAddress: string]: {
         [tokenAddress: string]: BigNumber[];
     };
diff --git a/packages/contracts/test/asset_proxy_dispatcher/dispatcher.ts b/packages/contracts/test/asset_proxy_dispatcher/dispatcher.ts
index b5630d807..6e0ec3dee 100644
--- a/packages/contracts/test/asset_proxy_dispatcher/dispatcher.ts
+++ b/packages/contracts/test/asset_proxy_dispatcher/dispatcher.ts
@@ -29,7 +29,7 @@ describe('AssetProxyDispatcher', () => {
     let makerAddress: string;
     let takerAddress: string;
 
-    let zrx: DummyERC20TokenContract;
+    let zrxToken: DummyERC20TokenContract;
     let erc20Proxy: ERC20ProxyContract;
     let erc721Proxy: ERC721ProxyContract;
     let assetProxyDispatcher: AssetProxyDispatcherContract;
@@ -46,11 +46,11 @@ describe('AssetProxyDispatcher', () => {
         erc20Wrapper = new ERC20Wrapper(deployer, provider, usedAddresses, owner);
         erc721Wrapper = new ERC721Wrapper(deployer, provider, usedAddresses, owner);
 
-        [zrx] = await erc20Wrapper.deployDummyERC20TokensAsync();
-        erc20Proxy = await erc20Wrapper.deployERC20ProxyAsync();
+        [zrxToken] = await erc20Wrapper.deployDummyTokensAsync();
+        erc20Proxy = await erc20Wrapper.deployProxyAsync();
         await erc20Wrapper.setBalancesAndAllowancesAsync();
 
-        erc721Proxy = await erc721Wrapper.deployERC721ProxyAsync();
+        erc721Proxy = await erc721Wrapper.deployProxyAsync();
 
         const assetProxyDispatcherInstance = await deployer.deployAsync(ContractName.AssetProxyDispatcher);
         assetProxyDispatcher = new AssetProxyDispatcherContract(
@@ -230,7 +230,7 @@ describe('AssetProxyDispatcher', () => {
                 { from: owner },
             );
             // Construct metadata for ERC20 proxy
-            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrx.address);
+            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Perform a transfer from makerAddress to takerAddress
             const erc20Balances = await erc20Wrapper.getBalancesAsync();
             const amount = new BigNumber(10);
@@ -243,17 +243,17 @@ describe('AssetProxyDispatcher', () => {
             );
             // Verify transfer was successful
             const newBalances = await erc20Wrapper.getBalancesAsync();
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(amount),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(amount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].add(amount),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].add(amount),
             );
         });
 
         it('should throw if dispatching to unregistered proxy', async () => {
             // Construct metadata for ERC20 proxy
-            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrx.address);
+            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Perform a transfer from makerAddress to takerAddress
             const erc20Balances = await erc20Wrapper.getBalancesAsync();
             const amount = new BigNumber(10);
@@ -278,7 +278,7 @@ describe('AssetProxyDispatcher', () => {
                 { from: owner },
             );
             // Construct metadata for ERC20 proxy
-            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrx.address);
+            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Perform a transfer from makerAddress to takerAddress
             const erc20Balances = await erc20Wrapper.getBalancesAsync();
             const amount = new BigNumber(10);
diff --git a/packages/contracts/test/asset_proxy_dispatcher/proxies.ts b/packages/contracts/test/asset_proxy_dispatcher/proxies.ts
index 830f40e13..14d96f023 100644
--- a/packages/contracts/test/asset_proxy_dispatcher/proxies.ts
+++ b/packages/contracts/test/asset_proxy_dispatcher/proxies.ts
@@ -29,7 +29,7 @@ describe('Asset Transfer Proxies', () => {
     let makerAddress: string;
     let takerAddress: string;
 
-    let zrx: DummyERC20TokenContract;
+    let zrxToken: DummyERC20TokenContract;
     let erc721Token: DummyERC721TokenContract;
     let erc20Proxy: ERC20ProxyContract;
     let erc721Proxy: ERC721ProxyContract;
@@ -51,15 +51,15 @@ describe('Asset Transfer Proxies', () => {
         erc20Wrapper = new ERC20Wrapper(deployer, provider, usedAddresses, owner);
         erc721Wrapper = new ERC721Wrapper(deployer, provider, usedAddresses, owner);
 
-        [zrx] = await erc20Wrapper.deployDummyERC20TokensAsync();
-        erc20Proxy = await erc20Wrapper.deployERC20ProxyAsync();
+        [zrxToken] = await erc20Wrapper.deployDummyTokensAsync();
+        erc20Proxy = await erc20Wrapper.deployProxyAsync();
         await erc20Wrapper.setBalancesAndAllowancesAsync();
         await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(assetProxyDispatcherAddress, {
             from: owner,
         });
 
-        [erc721Token] = await erc721Wrapper.deployDummyERC721TokensAsync();
-        erc721Proxy = await erc721Wrapper.deployERC721ProxyAsync();
+        [erc721Token] = await erc721Wrapper.deployDummyTokensAsync();
+        erc721Proxy = await erc721Wrapper.deployProxyAsync();
         await erc721Wrapper.setBalancesAndAllowancesAsync();
         const erc721Balances = await erc721Wrapper.getBalancesAsync();
         erc721MakerTokenId = erc721Balances[makerAddress][erc721Token.address][0];
@@ -76,7 +76,7 @@ describe('Asset Transfer Proxies', () => {
     describe('Transfer Proxy - ERC20', () => {
         it('should successfully transfer tokens', async () => {
             // Construct metadata for ERC20 proxy
-            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrx.address);
+            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Perform a transfer from makerAddress to takerAddress
             const erc20Balances = await erc20Wrapper.getBalancesAsync();
             const amount = new BigNumber(10);
@@ -89,17 +89,17 @@ describe('Asset Transfer Proxies', () => {
             );
             // Verify transfer was successful
             const newBalances = await erc20Wrapper.getBalancesAsync();
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(amount),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(amount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].add(amount),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].add(amount),
             );
         });
 
         it('should do nothing if transferring 0 amount of a token', async () => {
             // Construct metadata for ERC20 proxy
-            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrx.address);
+            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Perform a transfer from makerAddress to takerAddress
             const erc20Balances = await erc20Wrapper.getBalancesAsync();
             const amount = new BigNumber(0);
@@ -112,21 +112,21 @@ describe('Asset Transfer Proxies', () => {
             );
             // Verify transfer was successful
             const newBalances = await erc20Wrapper.getBalancesAsync();
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address],
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address],
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address],
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address],
             );
         });
 
         it('should throw if allowances are too low', async () => {
             // Construct metadata for ERC20 proxy
-            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrx.address);
+            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Create allowance less than transfer amount. Set allowance on proxy.
             const allowance = new BigNumber(0);
             const transferAmount = new BigNumber(10);
-            await zrx.approve.sendTransactionAsync(erc20Proxy.address, allowance, {
+            await zrxToken.approve.sendTransactionAsync(erc20Proxy.address, allowance, {
                 from: makerAddress,
             });
             // Perform a transfer; expect this to fail.
@@ -143,7 +143,7 @@ describe('Asset Transfer Proxies', () => {
 
         it('should throw if requesting address is not authorized', async () => {
             // Construct metadata for ERC20 proxy
-            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrx.address);
+            const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Perform a transfer from makerAddress to takerAddress
             const amount = new BigNumber(10);
             return expect(
diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index 9065c5e3f..666486cc3 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -28,7 +28,6 @@ import {
     AssetProxyId,
     ContractName,
     ERC20BalancesByOwner,
-    ERC721BalancesByOwner,
     ExchangeContractErrs,
     SignedOrder,
 } from '../../src/utils/types';
@@ -48,7 +47,7 @@ describe('Exchange core', () => {
 
     let erc20TokenA: DummyERC20TokenContract;
     let erc20TokenB: DummyERC20TokenContract;
-    let zrx: DummyERC20TokenContract;
+    let zrxToken: DummyERC20TokenContract;
     let erc721Token: DummyERC721TokenContract;
     let exchange: ExchangeContract;
     let assetProxyDispatcher: AssetProxyDispatcherContract;
@@ -77,12 +76,12 @@ describe('Exchange core', () => {
         erc20Wrapper = new ERC20Wrapper(deployer, provider, usedAddresses, owner);
         erc721Wrapper = new ERC721Wrapper(deployer, provider, usedAddresses, owner);
 
-        [erc20TokenA, erc20TokenB, zrx] = await erc20Wrapper.deployDummyERC20TokensAsync();
-        erc20Proxy = await erc20Wrapper.deployERC20ProxyAsync();
+        [erc20TokenA, erc20TokenB, zrxToken] = await erc20Wrapper.deployDummyTokensAsync();
+        erc20Proxy = await erc20Wrapper.deployProxyAsync();
         await erc20Wrapper.setBalancesAndAllowancesAsync();
 
-        [erc721Token] = await erc721Wrapper.deployDummyERC721TokensAsync();
-        erc721Proxy = await erc721Wrapper.deployERC721ProxyAsync();
+        [erc721Token] = await erc721Wrapper.deployDummyTokensAsync();
+        erc721Proxy = await erc721Wrapper.deployProxyAsync();
         await erc721Wrapper.setBalancesAndAllowancesAsync();
         const erc721Balances = await erc721Wrapper.getBalancesAsync();
         erc721MakerAssetIds = erc721Balances[makerAddress][erc721Token.address];
@@ -117,7 +116,7 @@ describe('Exchange core', () => {
 
         const exchangeInstance = await deployer.deployAsync(ContractName.Exchange, [
             assetProxyDispatcher.address,
-            assetProxyUtils.encodeERC20ProxyData(zrx.address),
+            assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
         ]);
         exchange = new ExchangeContract(exchangeInstance.abi, exchangeInstance.address, provider);
         await assetProxyDispatcher.addAuthorizedAddress.sendTransactionAsync(exchange.address, { from: owner });
@@ -227,8 +226,8 @@ describe('Exchange core', () => {
             expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultTakerAssetAddress].add(takerAssetFillAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(makerFeePaid),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(makerFeePaid),
             );
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
@@ -236,11 +235,11 @@ describe('Exchange core', () => {
             expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFilledAmount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(takerFeePaid),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(takerFeePaid),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(makerFeePaid.add(takerFeePaid)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFeePaid.add(takerFeePaid)),
             );
         });
 
@@ -280,8 +279,8 @@ describe('Exchange core', () => {
             expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultTakerAssetAddress].add(takerAssetFillAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(makerFeePaid),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(makerFeePaid),
             );
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
@@ -289,11 +288,11 @@ describe('Exchange core', () => {
             expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFilledAmount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(takerFeePaid),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(takerFeePaid),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(makerFeePaid.add(takerFeePaid)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFeePaid.add(takerFeePaid)),
             );
         });
 
@@ -333,8 +332,8 @@ describe('Exchange core', () => {
             expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultTakerAssetAddress].add(takerAssetFillAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(makerFeePaid),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(makerFeePaid),
             );
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
@@ -342,11 +341,11 @@ describe('Exchange core', () => {
             expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFilledAmount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(takerFeePaid),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(takerFeePaid),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(makerFeePaid.add(takerFeePaid)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFeePaid.add(takerFeePaid)),
             );
         });
 
@@ -388,8 +387,8 @@ describe('Exchange core', () => {
             expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultTakerAssetAddress].add(takerAssetFillAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(makerFeePaid),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(makerFeePaid),
             );
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
@@ -397,11 +396,11 @@ describe('Exchange core', () => {
             expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFilledAmount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(takerFeePaid),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(takerFeePaid),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(makerFeePaid.add(takerFeePaid)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFeePaid.add(takerFeePaid)),
             );
         });
 
@@ -424,8 +423,8 @@ describe('Exchange core', () => {
             expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultTakerAssetAddress].add(signedOrder.takerAssetAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(signedOrder.makerFee),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(signedOrder.makerFee),
             );
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(signedOrder.takerAssetAmount),
@@ -433,11 +432,13 @@ describe('Exchange core', () => {
             expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultMakerAssetAddress].add(signedOrder.makerAssetAmount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(signedOrder.takerFee),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(signedOrder.takerFee),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(signedOrder.makerFee.add(signedOrder.takerFee)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(
+                    signedOrder.makerFee.add(signedOrder.takerFee),
+                ),
             );
         });
 
@@ -768,8 +769,8 @@ describe('Exchange core', () => {
             expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultTakerAssetAddress].add(fillTakerAssetAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(makerFee),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(makerFee),
             );
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(fillTakerAssetAmount),
@@ -777,11 +778,11 @@ describe('Exchange core', () => {
             expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultMakerAssetAddress].add(fillMakerAssetAmount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(takerFee),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(takerFee),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(makerFee.add(takerFee)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFee.add(takerFee)),
             );
         });
     });
@@ -949,14 +950,16 @@ describe('Exchange core', () => {
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(signedOrder.makerFee),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(signedOrder.makerFee),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(signedOrder.takerFee),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(signedOrder.takerFee),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(signedOrder.makerFee.add(signedOrder.takerFee)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(
+                    signedOrder.makerFee.add(signedOrder.takerFee),
+                ),
             );
         });
 
@@ -987,14 +990,16 @@ describe('Exchange core', () => {
             expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultMakerAssetAddress].minus(signedOrder.makerAssetAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(signedOrder.makerFee),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(signedOrder.makerFee),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(signedOrder.takerFee),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(signedOrder.takerFee),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(signedOrder.makerFee.add(signedOrder.takerFee)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(
+                    signedOrder.makerFee.add(signedOrder.takerFee),
+                ),
             );
         });
     });
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index 60f47373e..d2d82f977 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -19,13 +19,7 @@ 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 {
-    AssetProxyId,
-    ContractName,
-    ERC20BalancesByOwner,
-    ERC721BalancesByOwner,
-    SignedOrder,
-} from '../../src/utils/types';
+import { AssetProxyId, ContractName, ERC20BalancesByOwner, SignedOrder } from '../../src/utils/types';
 import { chaiSetup } from '../utils/chai_setup';
 import { deployer } from '../utils/deployer';
 import { provider, web3Wrapper } from '../utils/web3_wrapper';
@@ -42,7 +36,7 @@ describe('Exchange wrappers', () => {
 
     let erc20TokenA: DummyERC20TokenContract;
     let erc20TokenB: DummyERC20TokenContract;
-    let zrx: DummyERC20TokenContract;
+    let zrxToken: DummyERC20TokenContract;
     let erc721Token: DummyERC721TokenContract;
     let exchange: ExchangeContract;
     let assetProxyDispatcher: AssetProxyDispatcherContract;
@@ -70,12 +64,12 @@ describe('Exchange wrappers', () => {
         erc20Wrapper = new ERC20Wrapper(deployer, provider, usedAddresses, owner);
         erc721Wrapper = new ERC721Wrapper(deployer, provider, usedAddresses, owner);
 
-        [erc20TokenA, erc20TokenB, zrx] = await erc20Wrapper.deployDummyERC20TokensAsync();
-        erc20Proxy = await erc20Wrapper.deployERC20ProxyAsync();
+        [erc20TokenA, erc20TokenB, zrxToken] = await erc20Wrapper.deployDummyTokensAsync();
+        erc20Proxy = await erc20Wrapper.deployProxyAsync();
         await erc20Wrapper.setBalancesAndAllowancesAsync();
 
-        [erc721Token] = await erc721Wrapper.deployDummyERC721TokensAsync();
-        erc721Proxy = await erc721Wrapper.deployERC721ProxyAsync();
+        [erc721Token] = await erc721Wrapper.deployDummyTokensAsync();
+        erc721Proxy = await erc721Wrapper.deployProxyAsync();
         await erc721Wrapper.setBalancesAndAllowancesAsync();
         const erc721Balances = await erc721Wrapper.getBalancesAsync();
         erc721MakerAssetId = erc721Balances[makerAddress][erc721Token.address][0];
@@ -110,7 +104,7 @@ describe('Exchange wrappers', () => {
 
         const exchangeInstance = await deployer.deployAsync(ContractName.Exchange, [
             assetProxyDispatcher.address,
-            assetProxyUtils.encodeERC20ProxyData(zrx.address),
+            assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
         ]);
         exchange = new ExchangeContract(exchangeInstance.abi, exchangeInstance.address, provider);
         await assetProxyDispatcher.addAuthorizedAddress.sendTransactionAsync(exchange.address, { from: owner });
@@ -169,8 +163,8 @@ describe('Exchange wrappers', () => {
             expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultTakerAssetAddress].add(takerAssetFillAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(makerFee),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(makerFee),
             );
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
@@ -178,11 +172,11 @@ describe('Exchange wrappers', () => {
             expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFilledAmount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(takerFee),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(takerFee),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(makerFee.add(takerFee)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFee.add(takerFee)),
             );
         });
 
@@ -237,8 +231,8 @@ describe('Exchange wrappers', () => {
             expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultTakerAssetAddress].add(takerAssetFillAmount),
             );
-            expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrx.address].minus(makerFee),
+            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[makerAddress][zrxToken.address].minus(makerFee),
             );
             expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
@@ -246,11 +240,11 @@ describe('Exchange wrappers', () => {
             expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFilledAmount),
             );
-            expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrx.address].minus(takerFee),
+            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[takerAddress][zrxToken.address].minus(takerFee),
             );
-            expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrx.address].add(makerFee.add(takerFee)),
+            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFee.add(takerFee)),
             );
         });
 
@@ -303,11 +297,11 @@ describe('Exchange wrappers', () => {
         });
 
         it('should not change erc20Balances if makerAssetAddress is ZRX, makerAssetAmount + makerFee > maker balance', async () => {
-            const makerZRXBalance = new BigNumber(erc20Balances[makerAddress][zrx.address]);
+            const makerZRXBalance = new BigNumber(erc20Balances[makerAddress][zrxToken.address]);
             const signedOrder = orderFactory.newSignedOrder({
                 makerAssetAmount: makerZRXBalance,
                 makerFee: new BigNumber(1),
-                makerAssetData: assetProxyUtils.encodeERC20ProxyData(zrx.address),
+                makerAssetData: assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
             });
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress);
             const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -315,11 +309,11 @@ describe('Exchange wrappers', () => {
         });
 
         it('should not change erc20Balances if makerAssetAddress is ZRX, makerAssetAmount + makerFee > maker allowance', async () => {
-            const makerZRXAllowance = await zrx.allowance.callAsync(makerAddress, erc20Proxy.address);
+            const makerZRXAllowance = await zrxToken.allowance.callAsync(makerAddress, erc20Proxy.address);
             const signedOrder = orderFactory.newSignedOrder({
                 makerAssetAmount: new BigNumber(makerZRXAllowance),
                 makerFee: new BigNumber(1),
-                makerAssetData: assetProxyUtils.encodeERC20ProxyData(zrx.address),
+                makerAssetData: assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
             });
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress);
             const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -327,11 +321,11 @@ describe('Exchange wrappers', () => {
         });
 
         it('should not change erc20Balances if takerAssetAddress is ZRX, takerAssetAmount + takerFee > taker balance', async () => {
-            const takerZRXBalance = new BigNumber(erc20Balances[takerAddress][zrx.address]);
+            const takerZRXBalance = new BigNumber(erc20Balances[takerAddress][zrxToken.address]);
             const signedOrder = orderFactory.newSignedOrder({
                 takerAssetAmount: takerZRXBalance,
                 takerFee: new BigNumber(1),
-                takerAssetData: assetProxyUtils.encodeERC20ProxyData(zrx.address),
+                takerAssetData: assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
             });
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress);
             const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -339,11 +333,11 @@ describe('Exchange wrappers', () => {
         });
 
         it('should not change erc20Balances if takerAssetAddress is ZRX, takerAssetAmount + takerFee > taker allowance', async () => {
-            const takerZRXAllowance = await zrx.allowance.callAsync(takerAddress, erc20Proxy.address);
+            const takerZRXAllowance = await zrxToken.allowance.callAsync(takerAddress, erc20Proxy.address);
             const signedOrder = orderFactory.newSignedOrder({
                 takerAssetAmount: new BigNumber(takerZRXAllowance),
                 takerFee: new BigNumber(1),
-                takerAssetData: assetProxyUtils.encodeERC20ProxyData(zrx.address),
+                takerAssetData: assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
             });
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress);
             const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -409,16 +403,20 @@ describe('Exchange wrappers', () => {
                     erc20Balances[makerAddress][takerAssetAddress] = erc20Balances[makerAddress][takerAssetAddress].add(
                         takerAssetFillAmount,
                     );
-                    erc20Balances[makerAddress][zrx.address] = erc20Balances[makerAddress][zrx.address].minus(makerFee);
+                    erc20Balances[makerAddress][zrxToken.address] = erc20Balances[makerAddress][zrxToken.address].minus(
+                        makerFee,
+                    );
                     erc20Balances[takerAddress][makerAssetAddress] = erc20Balances[takerAddress][makerAssetAddress].add(
                         makerAssetFilledAmount,
                     );
                     erc20Balances[takerAddress][takerAssetAddress] = erc20Balances[takerAddress][
                         takerAssetAddress
                     ].minus(takerAssetFillAmount);
-                    erc20Balances[takerAddress][zrx.address] = erc20Balances[takerAddress][zrx.address].minus(takerFee);
-                    erc20Balances[feeRecipientAddress][zrx.address] = erc20Balances[feeRecipientAddress][
-                        zrx.address
+                    erc20Balances[takerAddress][zrxToken.address] = erc20Balances[takerAddress][zrxToken.address].minus(
+                        takerFee,
+                    );
+                    erc20Balances[feeRecipientAddress][zrxToken.address] = erc20Balances[feeRecipientAddress][
+                        zrxToken.address
                     ].add(makerFee.add(takerFee));
                 });
 
@@ -454,16 +452,20 @@ describe('Exchange wrappers', () => {
                     erc20Balances[makerAddress][takerAssetAddress] = erc20Balances[makerAddress][takerAssetAddress].add(
                         takerAssetFillAmount,
                     );
-                    erc20Balances[makerAddress][zrx.address] = erc20Balances[makerAddress][zrx.address].minus(makerFee);
+                    erc20Balances[makerAddress][zrxToken.address] = erc20Balances[makerAddress][zrxToken.address].minus(
+                        makerFee,
+                    );
                     erc20Balances[takerAddress][makerAssetAddress] = erc20Balances[takerAddress][makerAssetAddress].add(
                         makerAssetFilledAmount,
                     );
                     erc20Balances[takerAddress][takerAssetAddress] = erc20Balances[takerAddress][
                         takerAssetAddress
                     ].minus(takerAssetFillAmount);
-                    erc20Balances[takerAddress][zrx.address] = erc20Balances[takerAddress][zrx.address].minus(takerFee);
-                    erc20Balances[feeRecipientAddress][zrx.address] = erc20Balances[feeRecipientAddress][
-                        zrx.address
+                    erc20Balances[takerAddress][zrxToken.address] = erc20Balances[takerAddress][zrxToken.address].minus(
+                        takerFee,
+                    );
+                    erc20Balances[feeRecipientAddress][zrxToken.address] = erc20Balances[feeRecipientAddress][
+                        zrxToken.address
                     ].add(makerFee.add(takerFee));
                 });
 
@@ -515,16 +517,20 @@ describe('Exchange wrappers', () => {
                     erc20Balances[makerAddress][takerAssetAddress] = erc20Balances[makerAddress][takerAssetAddress].add(
                         takerAssetFillAmount,
                     );
-                    erc20Balances[makerAddress][zrx.address] = erc20Balances[makerAddress][zrx.address].minus(makerFee);
+                    erc20Balances[makerAddress][zrxToken.address] = erc20Balances[makerAddress][zrxToken.address].minus(
+                        makerFee,
+                    );
                     erc20Balances[takerAddress][makerAssetAddress] = erc20Balances[takerAddress][makerAssetAddress].add(
                         makerAssetFilledAmount,
                     );
                     erc20Balances[takerAddress][takerAssetAddress] = erc20Balances[takerAddress][
                         takerAssetAddress
                     ].minus(takerAssetFillAmount);
-                    erc20Balances[takerAddress][zrx.address] = erc20Balances[takerAddress][zrx.address].minus(takerFee);
-                    erc20Balances[feeRecipientAddress][zrx.address] = erc20Balances[feeRecipientAddress][
-                        zrx.address
+                    erc20Balances[takerAddress][zrxToken.address] = erc20Balances[takerAddress][zrxToken.address].minus(
+                        takerFee,
+                    );
+                    erc20Balances[feeRecipientAddress][zrxToken.address] = erc20Balances[feeRecipientAddress][
+                        zrxToken.address
                     ].add(makerFee.add(takerFee));
                 });
 
@@ -566,16 +572,20 @@ describe('Exchange wrappers', () => {
                     erc20Balances[makerAddress][takerAssetAddress] = erc20Balances[makerAddress][takerAssetAddress].add(
                         takerAssetFillAmount,
                     );
-                    erc20Balances[makerAddress][zrx.address] = erc20Balances[makerAddress][zrx.address].minus(makerFee);
+                    erc20Balances[makerAddress][zrxToken.address] = erc20Balances[makerAddress][zrxToken.address].minus(
+                        makerFee,
+                    );
                     erc20Balances[takerAddress][makerAssetAddress] = erc20Balances[takerAddress][makerAssetAddress].add(
                         makerAssetFilledAmount,
                     );
                     erc20Balances[takerAddress][takerAssetAddress] = erc20Balances[takerAddress][
                         takerAssetAddress
                     ].minus(takerAssetFillAmount);
-                    erc20Balances[takerAddress][zrx.address] = erc20Balances[takerAddress][zrx.address].minus(takerFee);
-                    erc20Balances[feeRecipientAddress][zrx.address] = erc20Balances[feeRecipientAddress][
-                        zrx.address
+                    erc20Balances[takerAddress][zrxToken.address] = erc20Balances[takerAddress][zrxToken.address].minus(
+                        takerFee,
+                    );
+                    erc20Balances[feeRecipientAddress][zrxToken.address] = erc20Balances[feeRecipientAddress][
+                        zrxToken.address
                     ].add(makerFee.add(takerFee));
                 });
 
@@ -611,8 +621,8 @@ describe('Exchange wrappers', () => {
                 expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[makerAddress][defaultTakerAssetAddress].add(takerAssetFillAmount),
                 );
-                expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[makerAddress][zrx.address].minus(makerFee),
+                expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[makerAddress][zrxToken.address].minus(makerFee),
                 );
                 expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
@@ -620,11 +630,11 @@ describe('Exchange wrappers', () => {
                 expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFilledAmount),
                 );
-                expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[takerAddress][zrx.address].minus(takerFee),
+                expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[takerAddress][zrxToken.address].minus(takerFee),
                 );
-                expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[feeRecipientAddress][zrx.address].add(makerFee.add(takerFee)),
+                expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFee.add(takerFee)),
                 );
             });
 
@@ -637,7 +647,7 @@ describe('Exchange wrappers', () => {
                     erc20Balances[makerAddress][defaultTakerAssetAddress] = erc20Balances[makerAddress][
                         defaultTakerAssetAddress
                     ].add(signedOrder.takerAssetAmount);
-                    erc20Balances[makerAddress][zrx.address] = erc20Balances[makerAddress][zrx.address].minus(
+                    erc20Balances[makerAddress][zrxToken.address] = erc20Balances[makerAddress][zrxToken.address].minus(
                         signedOrder.makerFee,
                     );
                     erc20Balances[takerAddress][defaultMakerAssetAddress] = erc20Balances[takerAddress][
@@ -646,11 +656,11 @@ describe('Exchange wrappers', () => {
                     erc20Balances[takerAddress][defaultTakerAssetAddress] = erc20Balances[takerAddress][
                         defaultTakerAssetAddress
                     ].minus(signedOrder.takerAssetAmount);
-                    erc20Balances[takerAddress][zrx.address] = erc20Balances[takerAddress][zrx.address].minus(
+                    erc20Balances[takerAddress][zrxToken.address] = erc20Balances[takerAddress][zrxToken.address].minus(
                         signedOrder.takerFee,
                     );
-                    erc20Balances[feeRecipientAddress][zrx.address] = erc20Balances[feeRecipientAddress][
-                        zrx.address
+                    erc20Balances[feeRecipientAddress][zrxToken.address] = erc20Balances[feeRecipientAddress][
+                        zrxToken.address
                     ].add(signedOrder.makerFee.add(signedOrder.takerFee));
                 });
                 await exchangeWrapper.marketSellOrdersAsync(signedOrders, takerAddress, {
@@ -664,7 +674,9 @@ describe('Exchange wrappers', () => {
             it('should throw when an signedOrder does not use the same takerAssetAddress', async () => {
                 signedOrders = [
                     orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder({ takerAssetData: assetProxyUtils.encodeERC20ProxyData(zrx.address) }),
+                    orderFactory.newSignedOrder({
+                        takerAssetData: assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
+                    }),
                     orderFactory.newSignedOrder(),
                 ];
 
@@ -698,8 +710,8 @@ describe('Exchange wrappers', () => {
                 expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[makerAddress][defaultTakerAssetAddress].add(takerAssetFillAmount),
                 );
-                expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[makerAddress][zrx.address].minus(makerFee),
+                expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[makerAddress][zrxToken.address].minus(makerFee),
                 );
                 expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[takerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
@@ -707,11 +719,11 @@ describe('Exchange wrappers', () => {
                 expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFilledAmount),
                 );
-                expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[takerAddress][zrx.address].minus(takerFee),
+                expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[takerAddress][zrxToken.address].minus(takerFee),
                 );
-                expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[feeRecipientAddress][zrx.address].add(makerFee.add(takerFee)),
+                expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFee.add(takerFee)),
                 );
             });
 
@@ -724,7 +736,7 @@ describe('Exchange wrappers', () => {
                     erc20Balances[makerAddress][defaultTakerAssetAddress] = erc20Balances[makerAddress][
                         defaultTakerAssetAddress
                     ].add(signedOrder.takerAssetAmount);
-                    erc20Balances[makerAddress][zrx.address] = erc20Balances[makerAddress][zrx.address].minus(
+                    erc20Balances[makerAddress][zrxToken.address] = erc20Balances[makerAddress][zrxToken.address].minus(
                         signedOrder.makerFee,
                     );
                     erc20Balances[takerAddress][defaultMakerAssetAddress] = erc20Balances[takerAddress][
@@ -733,11 +745,11 @@ describe('Exchange wrappers', () => {
                     erc20Balances[takerAddress][defaultTakerAssetAddress] = erc20Balances[takerAddress][
                         defaultTakerAssetAddress
                     ].minus(signedOrder.takerAssetAmount);
-                    erc20Balances[takerAddress][zrx.address] = erc20Balances[takerAddress][zrx.address].minus(
+                    erc20Balances[takerAddress][zrxToken.address] = erc20Balances[takerAddress][zrxToken.address].minus(
                         signedOrder.takerFee,
                     );
-                    erc20Balances[feeRecipientAddress][zrx.address] = erc20Balances[feeRecipientAddress][
-                        zrx.address
+                    erc20Balances[feeRecipientAddress][zrxToken.address] = erc20Balances[feeRecipientAddress][
+                        zrxToken.address
                     ].add(signedOrder.makerFee.add(signedOrder.takerFee));
                 });
                 await exchangeWrapper.marketSellOrdersNoThrowAsync(signedOrders, takerAddress, {
@@ -751,7 +763,9 @@ describe('Exchange wrappers', () => {
             it('should throw when a signedOrder does not use the same takerAssetAddress', async () => {
                 signedOrders = [
                     orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder({ takerAssetData: assetProxyUtils.encodeERC20ProxyData(zrx.address) }),
+                    orderFactory.newSignedOrder({
+                        takerAssetData: assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
+                    }),
                     orderFactory.newSignedOrder(),
                 ];
 
@@ -785,8 +799,8 @@ describe('Exchange wrappers', () => {
                 expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[makerAddress][defaultTakerAssetAddress].add(makerAmountBought),
                 );
-                expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[makerAddress][zrx.address].minus(makerFee),
+                expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[makerAddress][zrxToken.address].minus(makerFee),
                 );
                 expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[takerAddress][defaultTakerAssetAddress].minus(makerAmountBought),
@@ -794,11 +808,11 @@ describe('Exchange wrappers', () => {
                 expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFillAmount),
                 );
-                expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[takerAddress][zrx.address].minus(takerFee),
+                expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[takerAddress][zrxToken.address].minus(takerFee),
                 );
-                expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[feeRecipientAddress][zrx.address].add(makerFee.add(takerFee)),
+                expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFee.add(takerFee)),
                 );
             });
 
@@ -811,7 +825,7 @@ describe('Exchange wrappers', () => {
                     erc20Balances[makerAddress][defaultTakerAssetAddress] = erc20Balances[makerAddress][
                         defaultTakerAssetAddress
                     ].add(signedOrder.takerAssetAmount);
-                    erc20Balances[makerAddress][zrx.address] = erc20Balances[makerAddress][zrx.address].minus(
+                    erc20Balances[makerAddress][zrxToken.address] = erc20Balances[makerAddress][zrxToken.address].minus(
                         signedOrder.makerFee,
                     );
                     erc20Balances[takerAddress][defaultMakerAssetAddress] = erc20Balances[takerAddress][
@@ -820,11 +834,11 @@ describe('Exchange wrappers', () => {
                     erc20Balances[takerAddress][defaultTakerAssetAddress] = erc20Balances[takerAddress][
                         defaultTakerAssetAddress
                     ].minus(signedOrder.takerAssetAmount);
-                    erc20Balances[takerAddress][zrx.address] = erc20Balances[takerAddress][zrx.address].minus(
+                    erc20Balances[takerAddress][zrxToken.address] = erc20Balances[takerAddress][zrxToken.address].minus(
                         signedOrder.takerFee,
                     );
-                    erc20Balances[feeRecipientAddress][zrx.address] = erc20Balances[feeRecipientAddress][
-                        zrx.address
+                    erc20Balances[feeRecipientAddress][zrxToken.address] = erc20Balances[feeRecipientAddress][
+                        zrxToken.address
                     ].add(signedOrder.makerFee.add(signedOrder.takerFee));
                 });
                 await exchangeWrapper.marketBuyOrdersAsync(signedOrders, takerAddress, {
@@ -838,7 +852,9 @@ describe('Exchange wrappers', () => {
             it('should throw when an signedOrder does not use the same makerAssetAddress', async () => {
                 signedOrders = [
                     orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder({ makerAssetData: assetProxyUtils.encodeERC20ProxyData(zrx.address) }),
+                    orderFactory.newSignedOrder({
+                        makerAssetData: assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
+                    }),
                     orderFactory.newSignedOrder(),
                 ];
 
@@ -872,8 +888,8 @@ describe('Exchange wrappers', () => {
                 expect(newBalances[makerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[makerAddress][defaultTakerAssetAddress].add(makerAmountBought),
                 );
-                expect(newBalances[makerAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[makerAddress][zrx.address].minus(makerFee),
+                expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[makerAddress][zrxToken.address].minus(makerFee),
                 );
                 expect(newBalances[takerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[takerAddress][defaultTakerAssetAddress].minus(makerAmountBought),
@@ -881,11 +897,11 @@ describe('Exchange wrappers', () => {
                 expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                     erc20Balances[takerAddress][defaultMakerAssetAddress].add(makerAssetFillAmount),
                 );
-                expect(newBalances[takerAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[takerAddress][zrx.address].minus(takerFee),
+                expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[takerAddress][zrxToken.address].minus(takerFee),
                 );
-                expect(newBalances[feeRecipientAddress][zrx.address]).to.be.bignumber.equal(
-                    erc20Balances[feeRecipientAddress][zrx.address].add(makerFee.add(takerFee)),
+                expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
+                    erc20Balances[feeRecipientAddress][zrxToken.address].add(makerFee.add(takerFee)),
                 );
             });
 
@@ -898,7 +914,7 @@ describe('Exchange wrappers', () => {
                     erc20Balances[makerAddress][defaultTakerAssetAddress] = erc20Balances[makerAddress][
                         defaultTakerAssetAddress
                     ].add(signedOrder.takerAssetAmount);
-                    erc20Balances[makerAddress][zrx.address] = erc20Balances[makerAddress][zrx.address].minus(
+                    erc20Balances[makerAddress][zrxToken.address] = erc20Balances[makerAddress][zrxToken.address].minus(
                         signedOrder.makerFee,
                     );
                     erc20Balances[takerAddress][defaultMakerAssetAddress] = erc20Balances[takerAddress][
@@ -907,11 +923,11 @@ describe('Exchange wrappers', () => {
                     erc20Balances[takerAddress][defaultTakerAssetAddress] = erc20Balances[takerAddress][
                         defaultTakerAssetAddress
                     ].minus(signedOrder.takerAssetAmount);
-                    erc20Balances[takerAddress][zrx.address] = erc20Balances[takerAddress][zrx.address].minus(
+                    erc20Balances[takerAddress][zrxToken.address] = erc20Balances[takerAddress][zrxToken.address].minus(
                         signedOrder.takerFee,
                     );
-                    erc20Balances[feeRecipientAddress][zrx.address] = erc20Balances[feeRecipientAddress][
-                        zrx.address
+                    erc20Balances[feeRecipientAddress][zrxToken.address] = erc20Balances[feeRecipientAddress][
+                        zrxToken.address
                     ].add(signedOrder.makerFee.add(signedOrder.takerFee));
                 });
                 await exchangeWrapper.marketSellOrdersNoThrowAsync(signedOrders, takerAddress, {
@@ -925,7 +941,9 @@ describe('Exchange wrappers', () => {
             it('should throw when a signedOrder does not use the same makerAssetAddress', async () => {
                 signedOrders = [
                     orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder({ makerAssetData: assetProxyUtils.encodeERC20ProxyData(zrx.address) }),
+                    orderFactory.newSignedOrder({
+                        makerAssetData: assetProxyUtils.encodeERC20ProxyData(zrxToken.address),
+                    }),
                     orderFactory.newSignedOrder(),
                 ];
 
diff --git a/packages/contracts/test/zrx_token.ts b/packages/contracts/test/zrx_token.ts
index 259b4310e..ddb7f0b35 100644
--- a/packages/contracts/test/zrx_token.ts
+++ b/packages/contracts/test/zrx_token.ts
@@ -24,7 +24,7 @@ describe('ZRXToken', () => {
 
     let MAX_UINT: BigNumber;
 
-    let zrx: ZRXTokenContract;
+    let zrxToken: ZRXTokenContract;
     let zrxAddress: string;
 
     before(async () => {
@@ -35,8 +35,8 @@ describe('ZRXToken', () => {
             networkId: constants.TESTRPC_NETWORK_ID,
         });
         const zrxInstance = await deployer.deployAsync(ContractName.ZRXToken);
-        zrx = new ZRXTokenContract(zrxInstance.abi, zrxInstance.address, provider);
-        zrxAddress = zrx.address;
+        zrxToken = new ZRXTokenContract(zrxInstance.abi, zrxInstance.address, provider);
+        zrxAddress = zrxToken.address;
         MAX_UINT = zeroEx.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
     });
     beforeEach(async () => {
@@ -47,25 +47,25 @@ describe('ZRXToken', () => {
     });
     describe('constants', () => {
         it('should have 18 decimals', async () => {
-            const decimals = new BigNumber(await zrx.decimals.callAsync());
+            const decimals = new BigNumber(await zrxToken.decimals.callAsync());
             const expectedDecimals = 18;
             expect(decimals).to.be.bignumber.equal(expectedDecimals);
         });
 
         it('should have a total supply of 1 billion tokens', async () => {
-            const totalSupply = new BigNumber(await zrx.totalSupply.callAsync());
+            const totalSupply = new BigNumber(await zrxToken.totalSupply.callAsync());
             const expectedTotalSupply = 1000000000;
             expect(ZeroEx.toUnitAmount(totalSupply, 18)).to.be.bignumber.equal(expectedTotalSupply);
         });
 
         it('should be named 0x Protocol Token', async () => {
-            const name = await zrx.name.callAsync();
+            const name = await zrxToken.name.callAsync();
             const expectedName = '0x Protocol Token';
             expect(name).to.be.equal(expectedName);
         });
 
         it('should have the symbol ZRX', async () => {
-            const symbol = await zrx.symbol.callAsync();
+            const symbol = await zrxToken.symbol.callAsync();
             const expectedSymbol = 'ZRX';
             expect(symbol).to.be.equal(expectedSymbol);
         });
@@ -74,7 +74,7 @@ describe('ZRXToken', () => {
     describe('constructor', () => {
         it('should initialize owner balance to totalSupply', async () => {
             const ownerBalance = await zeroEx.token.getBalanceAsync(zrxAddress, owner);
-            const totalSupply = new BigNumber(await zrx.totalSupply.callAsync());
+            const totalSupply = new BigNumber(await zrxToken.totalSupply.callAsync());
             expect(totalSupply).to.be.bignumber.equal(ownerBalance);
         });
     });
@@ -95,7 +95,7 @@ describe('ZRXToken', () => {
         });
 
         it('should return true on a 0 value transfer', async () => {
-            const didReturnTrue = await zrx.transfer.callAsync(spender, new BigNumber(0), {
+            const didReturnTrue = await zrxToken.transfer.callAsync(spender, new BigNumber(0), {
                 from: owner,
             });
             expect(didReturnTrue).to.be.true();
@@ -109,7 +109,7 @@ describe('ZRXToken', () => {
             await zeroEx.token.setAllowanceAsync(zrxAddress, owner, spender, amountToTransfer, {
                 gasLimit: constants.MAX_TOKEN_APPROVE_GAS,
             });
-            const didReturnTrue = await zrx.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender });
+            const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender });
             expect(didReturnTrue).to.be.false();
         });
 
@@ -121,13 +121,13 @@ describe('ZRXToken', () => {
             const spenderAllowanceIsInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
             expect(spenderAllowanceIsInsufficient).to.be.true();
 
-            const didReturnTrue = await zrx.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender });
+            const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender });
             expect(didReturnTrue).to.be.false();
         });
 
         it('should return true on a 0 value transfer', async () => {
             const amountToTransfer = new BigNumber(0);
-            const didReturnTrue = await zrx.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender });
+            const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, { from: spender });
             expect(didReturnTrue).to.be.true();
         });