Merge branch 'refactor/check-revert-reasons' into feature/combinatorial-testing

* refactor/check-revert-reasons:
  Temporarily switch revert reasons to `TransferFailed`. Should be `InvalidAmount` but because of an oversight in the assembly implementation of `dispatchTransferFrom`, it always throws `TransferFailed`
  Expect RevertReason be passed in, not string
  Rename RevertReasons to RevertReason since singular enum names are more common

# Conflicts:
#	packages/contracts/test/asset_proxy/proxies.ts
#	packages/contracts/test/exchange/core.ts

12 files changed, 92 insertions, 88 deletions

diff --git a/packages/contracts/src/utils/assertions.ts b/packages/contracts/src/utils/assertions.ts
index 29489e648..e702a3200 100644
--- a/packages/contracts/src/utils/assertions.ts
+++ b/packages/contracts/src/utils/assertions.ts
@@ -1,3 +1,4 @@
+import { RevertReason } from '@0xproject/types';
 import * as chai from 'chai';
 import * as _ from 'lodash';
 
@@ -59,7 +60,10 @@ export function expectRevertOrAlwaysFailingTransactionAsync<T>(p: Promise<T>): P
  * @returns a new Promise which will reject if the conditions are not met and
  * otherwise resolve with no value.
  */
-export function expectRevertReasonOrAlwaysFailingTransactionAsync<T>(p: Promise<T>, reason: string): PromiseLike<void> {
+export function expectRevertReasonOrAlwaysFailingTransactionAsync<T>(
+    p: Promise<T>,
+    reason: RevertReason,
+): PromiseLike<void> {
     return _expectEitherErrorAsync(p, 'always failing transaction', reason);
 }
 
diff --git a/packages/contracts/test/asset_proxy/authorizable.ts b/packages/contracts/test/asset_proxy/authorizable.ts
index badf50bfd..c2295dda6 100644
--- a/packages/contracts/test/asset_proxy/authorizable.ts
+++ b/packages/contracts/test/asset_proxy/authorizable.ts
@@ -1,5 +1,5 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { RevertReasons } from '@0xproject/types';
+import { RevertReason } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 
@@ -49,7 +49,7 @@ describe('Authorizable', () => {
         it('should throw if not called by owner', async () => {
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 authorizable.addAuthorizedAddress.sendTransactionAsync(notOwner, { from: notOwner }),
-                RevertReasons.OnlyContractOwner,
+                RevertReason.OnlyContractOwner,
             );
         });
         it('should allow owner to add an authorized address', async () => {
@@ -67,7 +67,7 @@ describe('Authorizable', () => {
             );
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
-                RevertReasons.TargetAlreadyAuthorized,
+                RevertReason.TargetAlreadyAuthorized,
             );
         });
     });
@@ -82,7 +82,7 @@ describe('Authorizable', () => {
                 authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
                     from: notOwner,
                 }),
-                RevertReasons.OnlyContractOwner,
+                RevertReason.OnlyContractOwner,
             );
         });
 
@@ -106,7 +106,7 @@ describe('Authorizable', () => {
                 authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
                     from: owner,
                 }),
-                RevertReasons.TargetNotAuthorized,
+                RevertReason.TargetNotAuthorized,
             );
         });
     });
diff --git a/packages/contracts/test/asset_proxy/proxies.ts b/packages/contracts/test/asset_proxy/proxies.ts
index 7e8e69f4e..5f4c5b597 100644
--- a/packages/contracts/test/asset_proxy/proxies.ts
+++ b/packages/contracts/test/asset_proxy/proxies.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils, generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { RevertReasons } from '@0xproject/types';
+import { RevertReason } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import { LogWithDecodedArgs } from 'ethereum-types';
@@ -173,7 +173,7 @@ describe('Asset Transfer Proxies', () => {
                         transferAmount,
                         { from: exchangeAddress },
                     ),
-                    RevertReasons.TransferFailed,
+                    RevertReason.TransferFailed,
                 );
             });
 
@@ -187,7 +187,7 @@ describe('Asset Transfer Proxies', () => {
                     erc20Proxy.transferFrom.sendTransactionAsync(encodedAssetData, makerAddress, takerAddress, amount, {
                         from: notAuthorized,
                     }),
-                    RevertReasons.SenderNotAuthorized,
+                    RevertReason.SenderNotAuthorized,
                 );
             });
         });
@@ -239,7 +239,7 @@ describe('Asset Transfer Proxies', () => {
                     erc20Proxy.batchTransferFrom.sendTransactionAsync(assetData, fromAddresses, toAddresses, amounts, {
                         from: notAuthorized,
                     }),
-                    RevertReasons.SenderNotAuthorized,
+                    RevertReason.SenderNotAuthorized,
                 );
             });
         });
@@ -381,7 +381,7 @@ describe('Asset Transfer Proxies', () => {
                         amount,
                         { from: exchangeAddress },
                     ),
-                    RevertReasons.InvalidAmount,
+                    RevertReason.InvalidAmount,
                 );
             });
 
@@ -401,7 +401,7 @@ describe('Asset Transfer Proxies', () => {
                         amount,
                         { from: exchangeAddress },
                     ),
-                    RevertReasons.InvalidAmount,
+                    RevertReason.InvalidAmount,
                 );
             });
 
@@ -421,7 +421,7 @@ describe('Asset Transfer Proxies', () => {
                     erc20Proxy.transferFrom.sendTransactionAsync(encodedAssetData, makerAddress, takerAddress, amount, {
                         from: exchangeAddress,
                     }),
-                    RevertReasons.TransferFailed,
+                    RevertReason.TransferFailed,
                 );
             });
 
@@ -438,7 +438,7 @@ describe('Asset Transfer Proxies', () => {
                         amount,
                         { from: notAuthorized },
                     ),
-                    RevertReasons.SenderNotAuthorized,
+                    RevertReason.SenderNotAuthorized,
                 );
             });
         });
@@ -493,7 +493,7 @@ describe('Asset Transfer Proxies', () => {
                     erc721Proxy.batchTransferFrom.sendTransactionAsync(assetData, fromAddresses, toAddresses, amounts, {
                         from: notAuthorized,
                     }),
-                    RevertReasons.SenderNotAuthorized,
+                    RevertReason.SenderNotAuthorized,
                 );
             });
         });
diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index 52bddf996..b3c3a891c 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils, orderHashUtils } from '@0xproject/order-utils';
-import { AssetProxyId, RevertReasons, SignedOrder } from '@0xproject/types';
+import { AssetProxyId, RevertReason, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
@@ -147,7 +147,7 @@ describe('Exchange core', () => {
             signedOrder.signature = invalidSigHex;
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
-                RevertReasons.InvalidOrderSignature,
+                RevertReason.InvalidOrderSignature,
             );
         });
 
@@ -156,7 +156,7 @@ describe('Exchange core', () => {
             await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress);
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
     });
@@ -170,7 +170,7 @@ describe('Exchange core', () => {
         it('should throw if not sent by maker', async () => {
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.cancelOrderAsync(signedOrder, takerAddress),
-                RevertReasons.InvalidMaker,
+                RevertReason.InvalidMaker,
             );
         });
 
@@ -181,7 +181,7 @@ describe('Exchange core', () => {
 
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
 
@@ -192,7 +192,7 @@ describe('Exchange core', () => {
 
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
 
@@ -202,7 +202,7 @@ describe('Exchange core', () => {
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, {
                     takerAssetFillAmount: signedOrder.takerAssetAmount.div(2),
                 }),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
 
@@ -225,7 +225,7 @@ describe('Exchange core', () => {
             await exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress);
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
 
@@ -235,7 +235,7 @@ describe('Exchange core', () => {
             });
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
 
@@ -255,7 +255,7 @@ describe('Exchange core', () => {
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, {
                     takerAssetFillAmount: fillTakerAssetAmount2,
                 }),
-                RevertReasons.RoundingError,
+                RevertReason.RoundingError,
             );
         });
     });
@@ -267,7 +267,7 @@ describe('Exchange core', () => {
             const lesserOrderEpoch = new BigNumber(0);
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.cancelOrdersUpToAsync(lesserOrderEpoch, makerAddress),
-                RevertReasons.InvalidNewOrderEpoch,
+                RevertReason.InvalidNewOrderEpoch,
             );
         });
 
@@ -276,7 +276,7 @@ describe('Exchange core', () => {
             await exchangeWrapper.cancelOrdersUpToAsync(orderEpoch, makerAddress);
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.cancelOrdersUpToAsync(orderEpoch, makerAddress),
-                RevertReasons.InvalidNewOrderEpoch,
+                RevertReason.InvalidNewOrderEpoch,
             );
         });
 
@@ -410,7 +410,7 @@ describe('Exchange core', () => {
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount }),
-                RevertReasons.InvalidAmount,
+                RevertReason.TransferFailed,
             );
         });
 
@@ -433,7 +433,7 @@ describe('Exchange core', () => {
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount }),
-                RevertReasons.InvalidAmount,
+                RevertReason.TransferFailed,
             );
         });
 
@@ -450,7 +450,7 @@ describe('Exchange core', () => {
             const takerAssetFillAmount = signedOrder.takerAssetAmount.div(2);
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount }),
-                RevertReasons.RoundingError,
+                RevertReason.RoundingError,
             );
         });
     });
diff --git a/packages/contracts/test/exchange/dispatcher.ts b/packages/contracts/test/exchange/dispatcher.ts
index 41ea88d4e..6ac57e6db 100644
--- a/packages/contracts/test/exchange/dispatcher.ts
+++ b/packages/contracts/test/exchange/dispatcher.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils } from '@0xproject/order-utils';
-import { AssetProxyId, RevertReasons } from '@0xproject/types';
+import { AssetProxyId, RevertReason } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 
@@ -185,7 +185,7 @@ describe('AssetProxyDispatcher', () => {
                     constants.NULL_ADDRESS,
                     { from: owner },
                 ),
-                RevertReasons.AssetProxyMismatch,
+                RevertReason.AssetProxyMismatch,
             );
         });
 
@@ -227,7 +227,7 @@ describe('AssetProxyDispatcher', () => {
                     prevProxyAddress,
                     { from: notOwner },
                 ),
-                RevertReasons.OnlyContractOwner,
+                RevertReason.OnlyContractOwner,
             );
         });
 
@@ -240,7 +240,7 @@ describe('AssetProxyDispatcher', () => {
                     prevProxyAddress,
                     { from: owner },
                 ),
-                RevertReasons.AssetProxyIdMismatch,
+                RevertReason.AssetProxyIdMismatch,
             );
         });
     });
@@ -319,7 +319,7 @@ describe('AssetProxyDispatcher', () => {
                     amount,
                     { from: owner },
                 ),
-                RevertReasons.AssetProxyDoesNotExist,
+                RevertReason.AssetProxyDoesNotExist,
             );
         });
     });
diff --git a/packages/contracts/test/exchange/match_orders.ts b/packages/contracts/test/exchange/match_orders.ts
index 7c4ad165e..04b566740 100644
--- a/packages/contracts/test/exchange/match_orders.ts
+++ b/packages/contracts/test/exchange/match_orders.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils } from '@0xproject/order-utils';
-import { AssetProxyId, RevertReasons } from '@0xproject/types';
+import { AssetProxyId, RevertReason } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
@@ -603,7 +603,7 @@ describe('matchOrders', () => {
             // Match orders
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.matchOrdersAsync(signedOrderLeft, signedOrderRight, takerAddress),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
 
@@ -628,7 +628,7 @@ describe('matchOrders', () => {
             // Match orders
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.matchOrdersAsync(signedOrderLeft, signedOrderRight, takerAddress),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
 
@@ -657,7 +657,7 @@ describe('matchOrders', () => {
                     erc20BalancesByOwner,
                     erc721TokenIdsByOwner,
                 ),
-                RevertReasons.NegativeSpreadRequired,
+                RevertReason.NegativeSpreadRequired,
             );
         });
 
@@ -690,7 +690,7 @@ describe('matchOrders', () => {
                 // reverse of the left order, rather than checking equality. This
                 // saves a bunch of gas, but as a result if the assetData fields are
                 // off then the failure ends up happening at signature validation
-                RevertReasons.InvalidOrderSignature,
+                RevertReason.InvalidOrderSignature,
             );
         });
 
@@ -721,7 +721,7 @@ describe('matchOrders', () => {
                     erc20BalancesByOwner,
                     erc721TokenIdsByOwner,
                 ),
-                RevertReasons.InvalidOrderSignature,
+                RevertReason.InvalidOrderSignature,
             );
         });
 
diff --git a/packages/contracts/test/exchange/signature_validator.ts b/packages/contracts/test/exchange/signature_validator.ts
index c610ead61..21cc343b3 100644
--- a/packages/contracts/test/exchange/signature_validator.ts
+++ b/packages/contracts/test/exchange/signature_validator.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { addSignedMessagePrefix, assetProxyUtils, MessagePrefixType, orderHashUtils } from '@0xproject/order-utils';
-import { RevertReasons, SignatureType, SignedOrder } from '@0xproject/types';
+import { RevertReason, SignatureType, SignedOrder } from '@0xproject/types';
 import * as chai from 'chai';
 import { LogWithDecodedArgs } from 'ethereum-types';
 import ethUtil = require('ethereumjs-util');
@@ -107,7 +107,7 @@ describe('MixinSignatureValidator', () => {
                     signedOrder.makerAddress,
                     emptySignature,
                 ),
-                RevertReasons.LengthGreaterThan0Required,
+                RevertReason.LengthGreaterThan0Required,
             );
         });
 
@@ -121,7 +121,7 @@ describe('MixinSignatureValidator', () => {
                     signedOrder.makerAddress,
                     unsupportedSignatureHex,
                 ),
-                RevertReasons.SignatureUnsupported,
+                RevertReason.SignatureUnsupported,
             );
         });
 
@@ -134,7 +134,7 @@ describe('MixinSignatureValidator', () => {
                     signedOrder.makerAddress,
                     unsupportedSignatureHex,
                 ),
-                RevertReasons.SignatureIllegal,
+                RevertReason.SignatureIllegal,
             );
         });
 
@@ -161,7 +161,7 @@ describe('MixinSignatureValidator', () => {
                     signedOrder.makerAddress,
                     signatureHex,
                 ),
-                RevertReasons.Length0Required,
+                RevertReason.Length0Required,
             );
         });
 
diff --git a/packages/contracts/test/exchange/transactions.ts b/packages/contracts/test/exchange/transactions.ts
index cfabe0435..67dc14e91 100644
--- a/packages/contracts/test/exchange/transactions.ts
+++ b/packages/contracts/test/exchange/transactions.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils, generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { AssetProxyId, OrderWithoutExchangeAddress, RevertReasons, SignedOrder } from '@0xproject/types';
+import { AssetProxyId, OrderWithoutExchangeAddress, RevertReason, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 
@@ -130,7 +130,7 @@ describe('Exchange transactions', () => {
             it('should throw if not called by specified sender', async () => {
                 return expectRevertReasonOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.executeTransactionAsync(signedTx, takerAddress),
-                    RevertReasons.FailedExecution,
+                    RevertReason.FailedExecution,
                 );
             });
 
@@ -173,7 +173,7 @@ describe('Exchange transactions', () => {
                 await exchangeWrapper.executeTransactionAsync(signedTx, senderAddress);
                 return expectRevertReasonOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.executeTransactionAsync(signedTx, senderAddress),
-                    RevertReasons.InvalidTxHash,
+                    RevertReason.InvalidTxHash,
                 );
             });
 
@@ -193,7 +193,7 @@ describe('Exchange transactions', () => {
             it('should throw if not called by specified sender', async () => {
                 return expectRevertReasonOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.executeTransactionAsync(signedTx, makerAddress),
-                    RevertReasons.FailedExecution,
+                    RevertReason.FailedExecution,
                 );
             });
 
@@ -201,7 +201,7 @@ describe('Exchange transactions', () => {
                 await exchangeWrapper.executeTransactionAsync(signedTx, senderAddress);
                 return expectRevertReasonOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.fillOrderAsync(signedOrder, senderAddress),
-                    RevertReasons.OrderUnfillable,
+                    RevertReason.OrderUnfillable,
                 );
             });
         });
@@ -253,7 +253,7 @@ describe('Exchange transactions', () => {
                         signedFillTx.signature,
                         { from: takerAddress },
                     ),
-                    RevertReasons.FailedExecution,
+                    RevertReason.FailedExecution,
                 );
             });
 
@@ -372,7 +372,7 @@ describe('Exchange transactions', () => {
                     signedOrder.signature,
                     { from: takerAddress },
                 ),
-                RevertReasons.MakerNotWhitelisted,
+                RevertReason.MakerNotWhitelisted,
             );
         });
 
@@ -394,7 +394,7 @@ describe('Exchange transactions', () => {
                     signedOrder.signature,
                     { from: takerAddress },
                 ),
-                RevertReasons.TakerNotWhitelisted,
+                RevertReason.TakerNotWhitelisted,
             );
         });
 
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index 7e3203291..32ca4859b 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils } from '@0xproject/order-utils';
-import { AssetProxyId, RevertReasons, SignedOrder } from '@0xproject/types';
+import { AssetProxyId, RevertReason, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
@@ -175,7 +175,7 @@ describe('Exchange wrappers', () => {
 
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrKillOrderAsync(signedOrder, takerAddress),
-                RevertReasons.OrderUnfillable,
+                RevertReason.OrderUnfillable,
             );
         });
 
@@ -188,7 +188,7 @@ describe('Exchange wrappers', () => {
 
             return expectRevertReasonOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrKillOrderAsync(signedOrder, takerAddress),
-                RevertReasons.CompleteFillFailed,
+                RevertReason.CompleteFillFailed,
             );
         });
     });
@@ -503,7 +503,7 @@ describe('Exchange wrappers', () => {
                     exchangeWrapper.batchFillOrKillOrdersAsync(signedOrders, takerAddress, {
                         takerAssetFillAmounts,
                     }),
-                    RevertReasons.OrderUnfillable,
+                    RevertReason.OrderUnfillable,
                 );
             });
         });
@@ -708,7 +708,7 @@ describe('Exchange wrappers', () => {
                     }),
                     // We simply use the takerAssetData from the first order for all orders.
                     // If they are not the same, the contract throws when validating the order signature
-                    RevertReasons.InvalidOrderSignature,
+                    RevertReason.InvalidOrderSignature,
                 );
             });
         });
@@ -924,7 +924,7 @@ describe('Exchange wrappers', () => {
                     exchangeWrapper.marketBuyOrdersAsync(signedOrders, takerAddress, {
                         makerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
-                    RevertReasons.InvalidOrderSignature,
+                    RevertReason.InvalidOrderSignature,
                 );
             });
         });
diff --git a/packages/contracts/test/libraries/lib_bytes.ts b/packages/contracts/test/libraries/lib_bytes.ts
index 5ab299b73..3d4058cbc 100644
--- a/packages/contracts/test/libraries/lib_bytes.ts
+++ b/packages/contracts/test/libraries/lib_bytes.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils, generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { RevertReasons } from '@0xproject/types';
+import { RevertReason } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import BN = require('bn.js');
 import * as chai from 'chai';
@@ -102,7 +102,7 @@ describe('LibBytes', () => {
         it('should revert if length is 0', async () => {
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicPopLastByte.callAsync(constants.NULL_BYTES),
-                RevertReasons.LibBytesGreaterThanZeroLengthRequired,
+                RevertReason.LibBytesGreaterThanZeroLengthRequired,
             );
         });
         it('should pop the last byte from the input and return it', async () => {
@@ -118,7 +118,7 @@ describe('LibBytes', () => {
         it('should revert if length is less than 20', async () => {
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicPopLast20Bytes.callAsync(byteArrayShorterThan20Bytes),
-                RevertReasons.LibBytesGreaterOrEqualTo20LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo20LengthRequired,
             );
         });
         it('should pop the last 20 bytes from the input and return it', async () => {
@@ -186,7 +186,7 @@ describe('LibBytes', () => {
         it('should revert if dest is shorter than source', async () => {
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicDeepCopyBytes.callAsync(byteArrayShorterThan32Bytes, byteArrayLongerThan32Bytes),
-                RevertReasons.LibBytesGreaterOrEqualToSourceBytesLengthRequired,
+                RevertReason.LibBytesGreaterOrEqualToSourceBytesLengthRequired,
             );
         });
         it('should overwrite dest with source if source and dest have equal length', async () => {
@@ -239,7 +239,7 @@ describe('LibBytes', () => {
             const offset = new BigNumber(0);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadAddress.callAsync(shortByteArray, offset),
-                RevertReasons.LibBytesGreaterOrEqualTo20LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo20LengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold an address', async () => {
@@ -247,7 +247,7 @@ describe('LibBytes', () => {
             const badOffset = new BigNumber(ethUtil.toBuffer(byteArray).byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadAddress.callAsync(byteArray, badOffset),
-                RevertReasons.LibBytesGreaterOrEqualTo20LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo20LengthRequired,
             );
         });
     });
@@ -283,7 +283,7 @@ describe('LibBytes', () => {
             const offset = new BigNumber(0);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicWriteAddress.callAsync(byteArrayShorterThan20Bytes, offset, testAddress),
-                RevertReasons.LibBytesGreaterOrEqualTo20LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo20LengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold an address', async () => {
@@ -291,7 +291,7 @@ describe('LibBytes', () => {
             const badOffset = new BigNumber(ethUtil.toBuffer(byteArray).byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicWriteAddress.callAsync(byteArray, badOffset, testAddress),
-                RevertReasons.LibBytesGreaterOrEqualTo20LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo20LengthRequired,
             );
         });
     });
@@ -315,14 +315,14 @@ describe('LibBytes', () => {
             const offset = new BigNumber(0);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadBytes32.callAsync(byteArrayShorterThan32Bytes, offset),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold a bytes32', async () => {
             const badOffset = new BigNumber(ethUtil.toBuffer(testBytes32).byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadBytes32.callAsync(testBytes32, badOffset),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
     });
@@ -358,7 +358,7 @@ describe('LibBytes', () => {
             const offset = new BigNumber(0);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicWriteBytes32.callAsync(byteArrayShorterThan32Bytes, offset, testBytes32),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold a bytes32', async () => {
@@ -366,7 +366,7 @@ describe('LibBytes', () => {
             const badOffset = new BigNumber(ethUtil.toBuffer(byteArray).byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicWriteBytes32.callAsync(byteArray, badOffset, testBytes32),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
     });
@@ -394,7 +394,7 @@ describe('LibBytes', () => {
             const offset = new BigNumber(0);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadUint256.callAsync(byteArrayShorterThan32Bytes, offset),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold a uint256', async () => {
@@ -404,7 +404,7 @@ describe('LibBytes', () => {
             const badOffset = new BigNumber(testUint256AsBuffer.byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadUint256.callAsync(byteArray, badOffset),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
     });
@@ -444,7 +444,7 @@ describe('LibBytes', () => {
             const offset = new BigNumber(0);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicWriteUint256.callAsync(byteArrayShorterThan32Bytes, offset, testUint256),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold a uint256', async () => {
@@ -452,7 +452,7 @@ describe('LibBytes', () => {
             const badOffset = new BigNumber(ethUtil.toBuffer(byteArray).byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicWriteUint256.callAsync(byteArray, badOffset, testUint256),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
     });
@@ -463,7 +463,7 @@ describe('LibBytes', () => {
             const byteArrayLessThan4Bytes = '0x010101';
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadBytes4.callAsync(byteArrayLessThan4Bytes, new BigNumber(0)),
-                RevertReasons.LibBytesGreaterOrEqualTo4LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo4LengthRequired,
             );
         });
         it('should return the first 4 bytes of a byte array of arbitrary length', async () => {
@@ -518,28 +518,28 @@ describe('LibBytes', () => {
             const offset = new BigNumber(0);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadBytesWithLength.callAsync(byteArrayShorterThan32Bytes, offset),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
         it('should fail if we store a nested byte array length, without a nested byte array', async () => {
             const offset = new BigNumber(0);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadBytesWithLength.callAsync(testBytes32, offset),
-                RevertReasons.LibBytesGreaterOrEqualToNestedBytesLengthRequired,
+                RevertReason.LibBytesGreaterOrEqualToNestedBytesLengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold the length of a nested byte array', async () => {
             const badOffset = new BigNumber(ethUtil.toBuffer(byteArrayShorterThan32Bytes).byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadBytesWithLength.callAsync(byteArrayShorterThan32Bytes, badOffset),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold the nested byte array', async () => {
             const badOffset = new BigNumber(ethUtil.toBuffer(testBytes32).byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicReadBytesWithLength.callAsync(testBytes32, badOffset),
-                RevertReasons.LibBytesGreaterOrEqualTo32LengthRequired,
+                RevertReason.LibBytesGreaterOrEqualTo32LengthRequired,
             );
         });
     });
@@ -651,7 +651,7 @@ describe('LibBytes', () => {
             const emptyByteArray = ethUtil.bufferToHex(new Buffer(1));
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicWriteBytesWithLength.callAsync(emptyByteArray, offset, longData),
-                RevertReasons.LibBytesGreaterOrEqualToNestedBytesLengthRequired,
+                RevertReason.LibBytesGreaterOrEqualToNestedBytesLengthRequired,
             );
         });
         it('should fail if the length between the offset and end of the byte array is too short to hold the length of a nested byte array)', async () => {
@@ -659,7 +659,7 @@ describe('LibBytes', () => {
             const badOffset = new BigNumber(ethUtil.toBuffer(shortTestBytesAsBuffer).byteLength);
             return expectRevertOrOtherErrorAsync(
                 libBytes.publicWriteBytesWithLength.callAsync(emptyByteArray, badOffset, shortData),
-                RevertReasons.LibBytesGreaterOrEqualToNestedBytesLengthRequired,
+                RevertReason.LibBytesGreaterOrEqualToNestedBytesLengthRequired,
             );
         });
     });
diff --git a/packages/contracts/test/unlimited_allowance_token.ts b/packages/contracts/test/unlimited_allowance_token.ts
index 6ad59d4f1..0eb82b5fe 100644
--- a/packages/contracts/test/unlimited_allowance_token.ts
+++ b/packages/contracts/test/unlimited_allowance_token.ts
@@ -1,5 +1,5 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { RevertReasons } from '@0xproject/types';
+import { RevertReason } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 
@@ -56,7 +56,7 @@ describe('UnlimitedAllowanceToken', () => {
             const amountToTransfer = ownerBalance.plus(1);
             return expectRevertOrOtherErrorAsync(
                 token.transfer.callAsync(spender, amountToTransfer, { from: owner }),
-                RevertReasons.Erc20InsufficientBalance,
+                RevertReason.Erc20InsufficientBalance,
             );
         });
 
@@ -97,7 +97,7 @@ describe('UnlimitedAllowanceToken', () => {
                 token.transferFrom.callAsync(owner, spender, amountToTransfer, {
                     from: spender,
                 }),
-                RevertReasons.Erc20InsufficientBalance,
+                RevertReason.Erc20InsufficientBalance,
             );
         });
 
@@ -113,7 +113,7 @@ describe('UnlimitedAllowanceToken', () => {
                 token.transferFrom.callAsync(owner, spender, amountToTransfer, {
                     from: spender,
                 }),
-                RevertReasons.Erc20InsufficientAllowance,
+                RevertReason.Erc20InsufficientAllowance,
             );
         });
 
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index fa7d91347..423292d45 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -169,7 +169,7 @@ export interface ERC721AssetData {
     receiverData: string;
 }
 
-export enum RevertReasons {
+export enum RevertReason {
     OrderUnfillable = 'ORDER_UNFILLABLE',
     InvalidMaker = 'INVALID_MAKER',
     InvalidTaker = 'INVALID_TAKER',