merge v2-prototype

32 files changed, 465 insertions, 335 deletions

diff --git a/packages/contracts/README.md b/packages/contracts/README.md
index 23551b69d..9c829c753 100644
--- a/packages/contracts/README.md
+++ b/packages/contracts/README.md
@@ -63,3 +63,12 @@ yarn lint
 ```bash
 yarn test
 ```
+
+### Run Tests Against Geth
+
+Follow the instructions in the README for the devnet package to start the
+devnet.
+
+```bash
+TEST_PROVIDER=geth yarn test
+```
diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index dbb476b0c..145b5aacf 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -22,8 +22,8 @@
         "compile": "sol-compiler",
         "clean": "shx rm -rf lib src/generated_contract_wrappers",
         "generate_contract_wrappers":
-            "abi-gen --abis  ${npm_package_config_abis} --template ../contract_templates/contract.handlebars --partials '../contract_templates/partials/**/*.handlebars' --output src/generated_contract_wrappers --backend ethers && prettier --write 'src/generated_contract_wrappers/**.ts'",
-        "lint": "tslint --project .",
+            "abi-gen --abis  ${npm_package_config_abis} --template ../contract_templates/contract.handlebars --partials '../contract_templates/partials/**/*.handlebars' --output src/generated_contract_wrappers/generated --backend ethers",
+        "lint": "tslint --project . --exclude **/src/contract_wrappers/**/* --exclude **/lib/**/*",
         "coverage:report:text": "istanbul report text",
         "coverage:report:html": "istanbul report html && open coverage/index.html",
         "coverage:report:lcov": "istanbul report lcov",
@@ -61,7 +61,6 @@
         "make-promises-safe": "^1.1.0",
         "mocha": "^4.0.1",
         "npm-run-all": "^4.1.2",
-        "prettier": "^1.11.1",
         "shx": "^0.2.2",
         "solc": "^0.4.24",
         "tslint": "5.8.0",
diff --git a/packages/contracts/src/contracts/current/protocol/Exchange/MixinExchangeCore.sol b/packages/contracts/src/contracts/current/protocol/Exchange/MixinExchangeCore.sol
index 42128c92a..12b57d99f 100644
--- a/packages/contracts/src/contracts/current/protocol/Exchange/MixinExchangeCore.sol
+++ b/packages/contracts/src/contracts/current/protocol/Exchange/MixinExchangeCore.sol
@@ -50,7 +50,7 @@ contract MixinExchangeCore is
 
     ////// Core exchange functions //////
 
-    /// @dev Cancels all orders reated by sender with a salt less than or equal to the specified salt value.
+    /// @dev Cancels all orders created by sender with a salt less than or equal to the specified salt value.
     /// @param salt Orders created with a salt less or equal to this value will be cancelled.
     function cancelOrdersUpTo(uint256 salt)
         external
diff --git a/packages/contracts/src/utils/assertions.ts b/packages/contracts/src/utils/assertions.ts
new file mode 100644
index 000000000..615e648f3
--- /dev/null
+++ b/packages/contracts/src/utils/assertions.ts
@@ -0,0 +1,63 @@
+import * as chai from 'chai';
+import * as _ from 'lodash';
+
+import { constants } from './constants';
+
+const expect = chai.expect;
+
+function _expectEitherErrorAsync<T>(p: Promise<T>, error1: string, error2: string): PromiseLike<void> {
+    return expect(p)
+        .to.be.rejected()
+        .then(e => {
+            expect(e).to.satisfy(
+                (err: Error) => _.includes(err.message, error1) || _.includes(err.message, error2),
+                `expected promise to reject with error message that includes "${error1}" or "${error2}", but got: ` +
+                    `"${e.message}"\n`,
+            );
+        });
+}
+
+/**
+ * Rejects if the given Promise does not reject with an error indicating
+ * insufficient funds.
+ * @param p the Promise which is expected to reject
+ * @returns a new Promise which will reject if the conditions are not met and
+ * otherwise resolve with no value.
+ */
+export function expectInsufficientFundsAsync<T>(p: Promise<T>): PromiseLike<void> {
+    return _expectEitherErrorAsync(p, 'insufficient funds', "sender doesn't have enough funds");
+}
+
+/**
+ * Rejects if the given Promise does not reject with a "revert" error or the
+ * given otherError.
+ * @param p the Promise which is expected to reject
+ * @param otherError the other error which is accepted as a valid reject error.
+ * @returns a new Promise which will reject if the conditions are not met and
+ * otherwise resolve with no value.
+ */
+export function expectRevertOrOtherErrorAsync<T>(p: Promise<T>, otherError: string): PromiseLike<void> {
+    return _expectEitherErrorAsync(p, constants.REVERT, otherError);
+}
+
+/**
+ * Rejects if the given Promise does not reject with a "revert" or "always
+ * failing transaction" error.
+ * @param p the Promise which is expected to reject
+ * @returns a new Promise which will reject if the conditions are not met and
+ * otherwise resolve with no value.
+ */
+export function expectRevertOrAlwaysFailingTransactionAsync<T>(p: Promise<T>): PromiseLike<void> {
+    return expectRevertOrOtherErrorAsync(p, 'always failing transaction');
+}
+
+/**
+ * Rejects if the given Promise does not reject with a "revert" or "Contract
+ * call failed" error.
+ * @param p the Promise which is expected to reject
+ * @returns a new Promise which will reject if the conditions are not met and
+ * otherwise resolve with no value.
+ */
+export function expectRevertOrContractCallFailedAsync<T>(p: Promise<T>): PromiseLike<void> {
+    return expectRevertOrOtherErrorAsync<T>(p, 'Contract call failed');
+}
diff --git a/packages/contracts/src/utils/constants.ts b/packages/contracts/src/utils/constants.ts
index 9b0b92545..fa2a4af3c 100644
--- a/packages/contracts/src/utils/constants.ts
+++ b/packages/contracts/src/utils/constants.ts
@@ -19,6 +19,13 @@ const TESTRPC_PRIVATE_KEYS_STRINGS = [
 export const constants = {
     INVALID_OPCODE: 'invalid opcode',
     REVERT: 'revert',
+    LIB_BYTES_GT_ZERO_LENGTH_REQUIRED: 'Length must be greater than 0.',
+    LIB_BYTES_GTE_4_LENGTH_REQUIRED: 'Length must be greater than or equal to 4.',
+    LIB_BYTES_GTE_20_LENGTH_REQUIRED: 'Length must be greater than or equal to 20.',
+    LIB_BYTES_GTE_32_LENGTH_REQUIRED: 'Length must be greater than or equal to 32.',
+    LIB_BYTES_INDEX_OUT_OF_BOUNDS: 'Specified array index is out of bounds.',
+    ERC20_INSUFFICIENT_BALANCE: 'Insufficient balance to complete transfer.',
+    ERC20_INSUFFICIENT_ALLOWANCE: 'Insufficient allowance to complete transfer.',
     TESTRPC_NETWORK_ID: 50,
     AWAIT_TRANSACTION_MINED_MS: 100,
     MAX_ETHERTOKEN_WITHDRAW_GAS: 43000,
diff --git a/packages/contracts/src/utils/coverage.ts b/packages/contracts/src/utils/coverage.ts
index a37939464..41c83f703 100644
--- a/packages/contracts/src/utils/coverage.ts
+++ b/packages/contracts/src/utils/coverage.ts
@@ -1,6 +1,5 @@
 import { devConstants } from '@0xproject/dev-utils';
 import { CoverageSubprovider, SolCompilerArtifactAdapter } from '@0xproject/sol-cov';
-import * as fs from 'fs';
 import * as _ from 'lodash';
 
 let coverageSubprovider: CoverageSubprovider;
diff --git a/packages/contracts/src/utils/exchange_wrapper.ts b/packages/contracts/src/utils/exchange_wrapper.ts
index ebc16dc00..a8ca5183e 100644
--- a/packages/contracts/src/utils/exchange_wrapper.ts
+++ b/packages/contracts/src/utils/exchange_wrapper.ts
@@ -1,7 +1,7 @@
 import { AssetProxyId, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { LogEntry, Provider, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
+import { Provider, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
 import * as _ from 'lodash';
 
 import { ExchangeContract } from '../generated_contract_wrappers/exchange';
@@ -60,14 +60,14 @@ export class ExchangeWrapper {
     public async fillOrderNoThrowAsync(
         signedOrder: SignedOrder,
         from: string,
-        opts: { takerAssetFillAmount?: BigNumber } = {},
+        opts: { takerAssetFillAmount?: BigNumber; gas?: number } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
         const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
         const txHash = await this._exchange.fillOrderNoThrow.sendTransactionAsync(
             params.order,
             params.takerAssetFillAmount,
             params.signature,
-            { from },
+            { from, gas: opts.gas },
         );
         const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
         return tx;
@@ -105,14 +105,14 @@ export class ExchangeWrapper {
     public async batchFillOrdersNoThrowAsync(
         orders: SignedOrder[],
         from: string,
-        opts: { takerAssetFillAmounts?: BigNumber[] } = {},
+        opts: { takerAssetFillAmounts?: BigNumber[]; gas?: number } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
         const params = formatters.createBatchFill(orders, opts.takerAssetFillAmounts);
         const txHash = await this._exchange.batchFillOrdersNoThrow.sendTransactionAsync(
             params.orders,
             params.takerAssetFillAmounts,
             params.signatures,
-            { from },
+            { from, gas: opts.gas },
         );
         const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
         return tx;
@@ -135,14 +135,14 @@ export class ExchangeWrapper {
     public async marketSellOrdersNoThrowAsync(
         orders: SignedOrder[],
         from: string,
-        opts: { takerAssetFillAmount: BigNumber },
+        opts: { takerAssetFillAmount: BigNumber; gas?: number },
     ): Promise<TransactionReceiptWithDecodedLogs> {
         const params = formatters.createMarketSellOrders(orders, opts.takerAssetFillAmount);
         const txHash = await this._exchange.marketSellOrdersNoThrow.sendTransactionAsync(
             params.orders,
             params.takerAssetFillAmount,
             params.signatures,
-            { from },
+            { from, gas: opts.gas },
         );
         const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
         return tx;
diff --git a/packages/contracts/src/utils/increase_time.ts b/packages/contracts/src/utils/increase_time.ts
new file mode 100644
index 000000000..4565d8dbc
--- /dev/null
+++ b/packages/contracts/src/utils/increase_time.ts
@@ -0,0 +1,31 @@
+import * as _ from 'lodash';
+
+import { constants } from './constants';
+import { web3Wrapper } from './web3_wrapper';
+
+let firstAccount: string | undefined;
+
+/**
+ * Increases time by the given number of seconds and then mines a block so that
+ * the current block timestamp has the offset applied.
+ * @param seconds the number of seconds by which to incrase the time offset.
+ * @returns a new Promise which will resolve with the new total time offset or
+ * reject if the time could not be increased.
+ */
+export async function increaseTimeAndMineBlockAsync(seconds: number): Promise<number> {
+    if (_.isUndefined(firstAccount)) {
+        const accounts = await web3Wrapper.getAvailableAddressesAsync();
+        firstAccount = accounts[0];
+    }
+
+    const offset = await web3Wrapper.increaseTimeAsync(seconds);
+    // Note: we need to send a transaction after increasing time so
+    // that a block is actually mined. The contract looks at the
+    // last mined block for the timestamp.
+    await web3Wrapper.awaitTransactionSuccessAsync(
+        await web3Wrapper.sendTransactionAsync({ from: firstAccount, to: firstAccount, value: 0 }),
+        constants.AWAIT_TRANSACTION_MINED_MS,
+    );
+
+    return offset;
+}
diff --git a/packages/contracts/src/utils/log_decoder.ts b/packages/contracts/src/utils/log_decoder.ts
index 07d10e69d..07127ba79 100644
--- a/packages/contracts/src/utils/log_decoder.ts
+++ b/packages/contracts/src/utils/log_decoder.ts
@@ -39,6 +39,7 @@ export class LogDecoder {
     }
     public decodeLogOrThrow<ArgsType extends DecodedLogArgs>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
         const logWithDecodedArgsOrLog = this._abiDecoder.tryToDecodeLogOrNoop(log);
+        // tslint:disable-next-line:no-unnecessary-type-assertion
         if (_.isUndefined((logWithDecodedArgsOrLog as LogWithDecodedArgs<ArgsType>).args)) {
             throw new Error(`Unable to decode log: ${JSON.stringify(log)}`);
         }
diff --git a/packages/contracts/src/utils/match_order_tester.ts b/packages/contracts/src/utils/match_order_tester.ts
index 8dafe16f3..f4f7f965b 100644
--- a/packages/contracts/src/utils/match_order_tester.ts
+++ b/packages/contracts/src/utils/match_order_tester.ts
@@ -1,38 +1,21 @@
-import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { assetProxyUtils, crypto, orderHashUtils } from '@0xproject/order-utils';
+import { assetProxyUtils, orderHashUtils } from '@0xproject/order-utils';
 import { AssetProxyId, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
-import { LogWithDecodedArgs } from 'ethereum-types';
-import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
 
-import { DummyERC20TokenContract } from '../generated_contract_wrappers/dummy_e_r_c20_token';
-import { DummyERC721TokenContract } from '../generated_contract_wrappers/dummy_e_r_c721_token';
-import { ERC20ProxyContract } from '../generated_contract_wrappers/e_r_c20_proxy';
-import { ERC721ProxyContract } from '../generated_contract_wrappers/e_r_c721_proxy';
-import {
-    CancelContractEventArgs,
-    ExchangeContract,
-    FillContractEventArgs,
-} from '../generated_contract_wrappers/exchange';
 import { chaiSetup } from '../utils/chai_setup';
-import { constants } from '../utils/constants';
 import { ERC20Wrapper } from '../utils/erc20_wrapper';
 import { ERC721Wrapper } from '../utils/erc721_wrapper';
 import { ExchangeWrapper } from '../utils/exchange_wrapper';
-import { OrderFactory } from '../utils/order_factory';
 import {
-    ContractName,
     ERC20BalancesByOwner,
     ERC721TokenIdsByOwner,
     TransferAmountsByMatchOrders as TransferAmounts,
 } from '../utils/types';
-import { provider, web3Wrapper } from '../utils/web3_wrapper';
 
 chaiSetup.configure();
 const expect = chai.expect;
-const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 
 export class MatchOrderTester {
     private _exchangeWrapper: ExchangeWrapper;
@@ -112,11 +95,6 @@ export class MatchOrderTester {
         initialTakerAssetFilledAmountLeft?: BigNumber,
         initialTakerAssetFilledAmountRight?: BigNumber,
     ): Promise<[ERC20BalancesByOwner, ERC721TokenIdsByOwner]> {
-        // Test setup & verify preconditions
-        const makerAddressLeft = signedOrderLeft.makerAddress;
-        const makerAddressRight = signedOrderRight.makerAddress;
-        const feeRecipientAddressLeft = signedOrderLeft.feeRecipientAddress;
-        const feeRecipientAddressRight = signedOrderRight.feeRecipientAddress;
         // Verify Left order preconditions
         const orderTakerAssetFilledAmountLeft = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
             orderHashUtils.getOrderHashHex(signedOrderLeft),
diff --git a/packages/contracts/src/utils/multi_sig_wrapper.ts b/packages/contracts/src/utils/multi_sig_wrapper.ts
index bcb31dac2..70f338861 100644
--- a/packages/contracts/src/utils/multi_sig_wrapper.ts
+++ b/packages/contracts/src/utils/multi_sig_wrapper.ts
@@ -6,7 +6,6 @@ import * as _ from 'lodash';
 import { AssetProxyOwnerContract } from '../generated_contract_wrappers/asset_proxy_owner';
 import { MultiSigWalletContract } from '../generated_contract_wrappers/multi_sig_wallet';
 
-import { constants } from './constants';
 import { LogDecoder } from './log_decoder';
 
 export class MultiSigWrapper {
diff --git a/packages/contracts/src/utils/order_factory.ts b/packages/contracts/src/utils/order_factory.ts
index af411c01f..6e4c9a883 100644
--- a/packages/contracts/src/utils/order_factory.ts
+++ b/packages/contracts/src/utils/order_factory.ts
@@ -1,7 +1,6 @@
 import { generatePseudoRandomSalt, orderHashUtils } from '@0xproject/order-utils';
 import { Order, SignatureType, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
-import * as _ from 'lodash';
 
 import { constants } from './constants';
 import { signingUtils } from './signing_utils';
diff --git a/packages/contracts/src/utils/order_utils.ts b/packages/contracts/src/utils/order_utils.ts
index 0d0329aa1..2a8791e4c 100644
--- a/packages/contracts/src/utils/order_utils.ts
+++ b/packages/contracts/src/utils/order_utils.ts
@@ -1,6 +1,5 @@
-import { Order, OrderWithoutExchangeAddress, SignedOrder } from '@0xproject/types';
+import { OrderWithoutExchangeAddress, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
-import ethUtil = require('ethereumjs-util');
 
 import { CancelOrder, MatchOrder } from './types';
 
diff --git a/packages/contracts/src/utils/transaction_factory.ts b/packages/contracts/src/utils/transaction_factory.ts
index 434611908..a060263b1 100644
--- a/packages/contracts/src/utils/transaction_factory.ts
+++ b/packages/contracts/src/utils/transaction_factory.ts
@@ -1,6 +1,5 @@
 import { crypto, generatePseudoRandomSalt } from '@0xproject/order-utils';
 import { SignatureType } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
 import * as ethUtil from 'ethereumjs-util';
 
 import { signingUtils } from './signing_utils';
diff --git a/packages/contracts/src/utils/types.ts b/packages/contracts/src/utils/types.ts
index 360e1fdbc..491890fa1 100644
--- a/packages/contracts/src/utils/types.ts
+++ b/packages/contracts/src/utils/types.ts
@@ -1,6 +1,6 @@
-import { Order, OrderWithoutExchangeAddress } from '@0xproject/types';
+import { OrderWithoutExchangeAddress } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
-import { AbiDefinition, ContractAbi } from 'ethereum-types';
+import { AbiDefinition } from 'ethereum-types';
 
 export interface ERC20BalancesByOwner {
     [ownerAddress: string]: {
diff --git a/packages/contracts/src/utils/web3_wrapper.ts b/packages/contracts/src/utils/web3_wrapper.ts
index 1049ab967..df9bf88c8 100644
--- a/packages/contracts/src/utils/web3_wrapper.ts
+++ b/packages/contracts/src/utils/web3_wrapper.ts
@@ -1,19 +1,53 @@
 import { devConstants, env, EnvVars, web3Factory } from '@0xproject/dev-utils';
 import { prependSubprovider } from '@0xproject/subproviders';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { Provider } from 'ethereum-types';
 
 import { coverage } from './coverage';
 
-export const txDefaults = {
+enum ProviderType {
+    Ganache = 'ganache',
+    Geth = 'geth',
+}
+
+let testProvider: ProviderType;
+switch (process.env.TEST_PROVIDER) {
+    case undefined:
+        testProvider = ProviderType.Ganache;
+        break;
+    case 'ganache':
+        testProvider = ProviderType.Ganache;
+        break;
+    case 'geth':
+        testProvider = ProviderType.Geth;
+        break;
+    default:
+        throw new Error(`Unknown TEST_PROVIDER: ${process.env.TEST_PROVIDER}`);
+}
+
+const ganacheTxDefaults = {
     from: devConstants.TESTRPC_FIRST_ADDRESS,
     gas: devConstants.GAS_LIMIT,
 };
-const providerConfigs = { shouldUseInProcessGanache: true };
+const gethTxDefaults = {
+    from: devConstants.TESTRPC_FIRST_ADDRESS,
+};
+export const txDefaults = testProvider === ProviderType.Ganache ? ganacheTxDefaults : gethTxDefaults;
+
+const gethConfigs = {
+    shouldUseInProcessGanache: false,
+    rpcUrl: 'http://localhost:8501',
+    shouldUseFakeGasEstimate: false,
+};
+const ganacheConfigs = {
+    shouldUseInProcessGanache: true,
+};
+const providerConfigs = testProvider === ProviderType.Ganache ? ganacheConfigs : gethConfigs;
+
 export const provider = web3Factory.getRpcProvider(providerConfigs);
 const isCoverageEnabled = env.parseBoolean(EnvVars.SolidityCoverage);
 if (isCoverageEnabled) {
     const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
     prependSubprovider(provider, coverageSubprovider);
 }
+
 export const web3Wrapper = new Web3Wrapper(provider);
diff --git a/packages/contracts/test/asset_proxy/authorizable.ts b/packages/contracts/test/asset_proxy/authorizable.ts
index 6ceebf089..347d060d6 100644
--- a/packages/contracts/test/asset_proxy/authorizable.ts
+++ b/packages/contracts/test/asset_proxy/authorizable.ts
@@ -1,11 +1,10 @@
-import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import * as chai from 'chai';
 import 'make-promises-safe';
-import * as Web3 from 'web3';
 
 import { MixinAuthorizableContract } from '../../src/generated_contract_wrappers/mixin_authorizable';
 import { artifacts } from '../../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
 import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper';
@@ -44,9 +43,9 @@ describe('Authorizable', () => {
     });
     describe('addAuthorizedAddress', () => {
         it('should throw if not called by owner', async () => {
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 authorizable.addAuthorizedAddress.sendTransactionAsync(notOwner, { from: notOwner }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
         it('should allow owner to add an authorized address', async () => {
             await web3Wrapper.awaitTransactionSuccessAsync(
@@ -61,9 +60,9 @@ describe('Authorizable', () => {
                 await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
                 constants.AWAIT_TRANSACTION_MINED_MS,
             );
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
     });
 
@@ -73,11 +72,11 @@ describe('Authorizable', () => {
                 await authorizable.addAuthorizedAddress.sendTransactionAsync(address, { from: owner }),
                 constants.AWAIT_TRANSACTION_MINED_MS,
             );
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
                     from: notOwner,
                 }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should allow owner to remove an authorized address', async () => {
@@ -96,11 +95,11 @@ describe('Authorizable', () => {
         });
 
         it('should throw if owner attempts to remove an address that is not authorized', async () => {
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 authorizable.removeAuthorizedAddress.sendTransactionAsync(address, {
                     from: owner,
                 }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
     });
 
diff --git a/packages/contracts/test/asset_proxy/proxies.ts b/packages/contracts/test/asset_proxy/proxies.ts
index 39dfb9938..bf2aa8f70 100644
--- a/packages/contracts/test/asset_proxy/proxies.ts
+++ b/packages/contracts/test/asset_proxy/proxies.ts
@@ -1,15 +1,14 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils } from '@0xproject/order-utils';
-import { AssetProxyId } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import * as _ from 'lodash';
-import * as Web3 from 'web3';
 
-import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c20_token';
-import { DummyERC721TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c721_token';
-import { ERC20ProxyContract } from '../../src/generated_contract_wrappers/e_r_c20_proxy';
-import { ERC721ProxyContract } from '../../src/generated_contract_wrappers/e_r_c721_proxy';
+import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/generated/dummy_e_r_c20_token';
+import { DummyERC721TokenContract } from '../../src/generated_contract_wrappers/generated/dummy_e_r_c721_token';
+import { ERC20ProxyContract } from '../../src/generated_contract_wrappers/generated/e_r_c20_proxy';
+import { ERC721ProxyContract } from '../../src/generated_contract_wrappers/generated/e_r_c721_proxy';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
 import { ERC20Wrapper } from '../../src/utils/erc20_wrapper';
@@ -144,7 +143,7 @@ describe('Asset Transfer Proxies', () => {
                     constants.AWAIT_TRANSACTION_MINED_MS,
                 );
                 // Perform a transfer; expect this to fail.
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     erc20Proxy.transferFrom.sendTransactionAsync(
                         encodedProxyMetadata,
                         makerAddress,
@@ -152,7 +151,7 @@ describe('Asset Transfer Proxies', () => {
                         transferAmount,
                         { from: notAuthorized },
                     ),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should throw if requesting address is not authorized', async () => {
@@ -160,7 +159,7 @@ describe('Asset Transfer Proxies', () => {
                 const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
                 // Perform a transfer from makerAddress to takerAddress
                 const amount = new BigNumber(10);
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     erc20Proxy.transferFrom.sendTransactionAsync(
                         encodedProxyMetadata,
                         makerAddress,
@@ -170,7 +169,7 @@ describe('Asset Transfer Proxies', () => {
                             from: notAuthorized,
                         },
                     ),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
@@ -217,7 +216,7 @@ describe('Asset Transfer Proxies', () => {
                 const toAddresses = _.times(numTransfers, () => takerAddress);
                 const amounts = _.times(numTransfers, () => amount);
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     erc20Proxy.batchTransferFrom.sendTransactionAsync(
                         assetMetadata,
                         fromAddresses,
@@ -225,7 +224,7 @@ describe('Asset Transfer Proxies', () => {
                         amounts,
                         { from: notAuthorized },
                     ),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
@@ -247,7 +246,6 @@ describe('Asset Transfer Proxies', () => {
                 const ownerMakerAsset = await erc721Token.ownerOf.callAsync(erc721MakerTokenId);
                 expect(ownerMakerAsset).to.be.bignumber.equal(makerAddress);
                 // Perform a transfer from makerAddress to takerAddress
-                const erc20Balances = await erc20Wrapper.getBalancesAsync();
                 const amount = new BigNumber(1);
                 await web3Wrapper.awaitTransactionSuccessAsync(
                     await erc721Proxy.transferFrom.sendTransactionAsync(
@@ -274,9 +272,8 @@ describe('Asset Transfer Proxies', () => {
                 const ownerMakerAsset = await erc721Token.ownerOf.callAsync(erc721MakerTokenId);
                 expect(ownerMakerAsset).to.be.bignumber.equal(makerAddress);
                 // Perform a transfer from makerAddress to takerAddress
-                const erc20Balances = await erc20Wrapper.getBalancesAsync();
                 const amount = new BigNumber(0);
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     erc721Proxy.transferFrom.sendTransactionAsync(
                         encodedProxyMetadata,
                         makerAddress,
@@ -284,7 +281,7 @@ describe('Asset Transfer Proxies', () => {
                         amount,
                         { from: exchangeAddress },
                     ),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should throw if transferring > 1 amount of a token', async () => {
@@ -297,9 +294,8 @@ describe('Asset Transfer Proxies', () => {
                 const ownerMakerAsset = await erc721Token.ownerOf.callAsync(erc721MakerTokenId);
                 expect(ownerMakerAsset).to.be.bignumber.equal(makerAddress);
                 // Perform a transfer from makerAddress to takerAddress
-                const erc20Balances = await erc20Wrapper.getBalancesAsync();
                 const amount = new BigNumber(500);
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     erc721Proxy.transferFrom.sendTransactionAsync(
                         encodedProxyMetadata,
                         makerAddress,
@@ -307,7 +303,7 @@ describe('Asset Transfer Proxies', () => {
                         amount,
                         { from: exchangeAddress },
                     ),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should throw if allowances are too low', async () => {
@@ -325,7 +321,7 @@ describe('Asset Transfer Proxies', () => {
                 );
                 // Perform a transfer; expect this to fail.
                 const amount = new BigNumber(1);
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     erc20Proxy.transferFrom.sendTransactionAsync(
                         encodedProxyMetadata,
                         makerAddress,
@@ -335,7 +331,7 @@ describe('Asset Transfer Proxies', () => {
                             from: notAuthorized,
                         },
                     ),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should throw if requesting address is not authorized', async () => {
@@ -346,7 +342,7 @@ describe('Asset Transfer Proxies', () => {
                 );
                 // Perform a transfer from makerAddress to takerAddress
                 const amount = new BigNumber(1);
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     erc721Proxy.transferFrom.sendTransactionAsync(
                         encodedProxyMetadata,
                         makerAddress,
@@ -354,7 +350,7 @@ describe('Asset Transfer Proxies', () => {
                         amount,
                         { from: notAuthorized },
                     ),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
@@ -404,7 +400,7 @@ describe('Asset Transfer Proxies', () => {
                 const toAddresses = _.times(numTransfers, () => takerAddress);
                 const amounts = _.times(numTransfers, () => new BigNumber(1));
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     erc721Proxy.batchTransferFrom.sendTransactionAsync(
                         assetMetadata,
                         fromAddresses,
@@ -412,7 +408,7 @@ describe('Asset Transfer Proxies', () => {
                         amounts,
                         { from: notAuthorized },
                     ),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
diff --git a/packages/contracts/test/asset_proxy_owner.ts b/packages/contracts/test/asset_proxy_owner.ts
index 9618e1905..cbe429b12 100644
--- a/packages/contracts/test/asset_proxy_owner.ts
+++ b/packages/contracts/test/asset_proxy_owner.ts
@@ -2,9 +2,7 @@ import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import { LogWithDecodedArgs } from 'ethereum-types';
-import * as _ from 'lodash';
 import 'make-promises-safe';
-import * as Web3 from 'web3';
 
 import {
     AssetProxyOwnerContract,
@@ -15,15 +13,20 @@ import {
 } from '../src/generated_contract_wrappers/asset_proxy_owner';
 import { MixinAuthorizableContract } from '../src/generated_contract_wrappers/mixin_authorizable';
 import { artifacts } from '../src/utils/artifacts';
+import {
+    expectRevertOrAlwaysFailingTransactionAsync,
+    expectRevertOrContractCallFailedAsync,
+} from '../src/utils/assertions';
 import { chaiSetup } from '../src/utils/chai_setup';
 import { constants } from '../src/utils/constants';
+import { increaseTimeAndMineBlockAsync } from '../src/utils/increase_time';
 import { MultiSigWrapper } from '../src/utils/multi_sig_wrapper';
 import { provider, txDefaults, web3Wrapper } from '../src/utils/web3_wrapper';
 
 chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-
+// tslint:disable:no-unnecessary-type-assertion
 describe('AssetProxyOwner', () => {
     let owners: string[];
     let authorized: string;
@@ -101,7 +104,7 @@ describe('AssetProxyOwner', () => {
         });
         it('should throw if a null address is included in assetProxyContracts', async () => {
             const assetProxyContractAddresses = [erc20Proxy.address, constants.NULL_ADDRESS];
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 AssetProxyOwnerContract.deployFrom0xArtifactAsync(
                     artifacts.AssetProxyOwner,
                     provider,
@@ -111,7 +114,7 @@ describe('AssetProxyOwner', () => {
                     REQUIRED_APPROVALS,
                     SECONDS_TIME_LOCKED,
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
     });
 
@@ -120,9 +123,9 @@ describe('AssetProxyOwner', () => {
             const notRemoveAuthorizedAddressData = erc20Proxy.addAuthorizedAddress.getABIEncodedTransactionData(
                 owners[0],
             );
-            return expect(
+            return expectRevertOrContractCallFailedAsync(
                 multiSig.isFunctionRemoveAuthorizedAddress.callAsync(notRemoveAuthorizedAddressData),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should return true if data is for removeAuthorizedAddress', async () => {
@@ -139,9 +142,9 @@ describe('AssetProxyOwner', () => {
     describe('registerAssetProxy', () => {
         it('should throw if not called by multisig', async () => {
             const isRegistered = true;
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 multiSig.registerAssetProxy.sendTransactionAsync(erc20Proxy.address, isRegistered, { from: owners[0] }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should register an address if called by multisig after timelock', async () => {
@@ -156,11 +159,12 @@ describe('AssetProxyOwner', () => {
                 registerAssetProxyData,
                 owners[0],
             );
+
             const log = submitTxRes.logs[0] as LogWithDecodedArgs<SubmissionContractEventArgs>;
             const txId = log.args.transactionId;
 
             await multiSigWrapper.confirmTransactionAsync(txId, owners[1]);
-            await web3Wrapper.increaseTimeAsync(SECONDS_TIME_LOCKED.toNumber());
+            await increaseTimeAndMineBlockAsync(SECONDS_TIME_LOCKED.toNumber());
 
             const executeTxRes = await multiSigWrapper.executeTransactionAsync(txId, owners[0]);
             const registerLog = executeTxRes.logs[0] as LogWithDecodedArgs<AssetProxyRegistrationContractEventArgs>;
@@ -187,7 +191,7 @@ describe('AssetProxyOwner', () => {
             const txId = log.args.transactionId;
 
             await multiSigWrapper.confirmTransactionAsync(txId, owners[1]);
-            await web3Wrapper.increaseTimeAsync(SECONDS_TIME_LOCKED.toNumber());
+            await increaseTimeAndMineBlockAsync(SECONDS_TIME_LOCKED.toNumber());
 
             const executeTxRes = await multiSigWrapper.executeTransactionAsync(txId, owners[0]);
             const failureLog = executeTxRes.logs[0] as LogWithDecodedArgs<ExecutionFailureContractEventArgs>;
@@ -239,7 +243,7 @@ describe('AssetProxyOwner', () => {
 
             await multiSigWrapper.confirmTransactionAsync(erc20AddAuthorizedAddressTxId, owners[1]);
             await multiSigWrapper.confirmTransactionAsync(erc721AddAuthorizedAddressTxId, owners[1]);
-            await web3Wrapper.increaseTimeAsync(SECONDS_TIME_LOCKED.toNumber());
+            await increaseTimeAndMineBlockAsync(SECONDS_TIME_LOCKED.toNumber());
             await multiSigWrapper.executeTransactionAsync(registerAssetProxyTxId, owners[0]);
             await multiSigWrapper.executeTransactionAsync(erc20AddAuthorizedAddressTxId, owners[0]);
             await multiSigWrapper.executeTransactionAsync(erc721AddAuthorizedAddressTxId, owners[0]);
@@ -257,9 +261,9 @@ describe('AssetProxyOwner', () => {
             const log = res.logs[0] as LogWithDecodedArgs<SubmissionContractEventArgs>;
             const txId = log.args.transactionId;
 
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 multiSig.executeRemoveAuthorizedAddress.sendTransactionAsync(txId, { from: owners[1] }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw if tx destination is not registered', async () => {
@@ -276,9 +280,9 @@ describe('AssetProxyOwner', () => {
 
             await multiSigWrapper.confirmTransactionAsync(txId, owners[1]);
 
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 multiSig.executeRemoveAuthorizedAddress.sendTransactionAsync(txId, { from: owners[1] }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw if tx data is not for removeAuthorizedAddress', async () => {
@@ -296,9 +300,9 @@ describe('AssetProxyOwner', () => {
 
             await multiSigWrapper.confirmTransactionAsync(txId, owners[1]);
 
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 multiSig.executeRemoveAuthorizedAddress.sendTransactionAsync(txId, { from: owners[1] }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should execute removeAuthorizedAddress for registered address if fully confirmed', async () => {
@@ -349,9 +353,10 @@ describe('AssetProxyOwner', () => {
             const isExecuted = tx[3];
             expect(isExecuted).to.equal(true);
 
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 multiSig.executeRemoveAuthorizedAddress.sendTransactionAsync(txId, { from: owners[1] }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
     });
 });
+// tslint:enable:no-unnecessary-type-assertion
diff --git a/packages/contracts/test/ether_token.ts b/packages/contracts/test/ether_token.ts
index 000ea6e46..e2fc69aee 100644
--- a/packages/contracts/test/ether_token.ts
+++ b/packages/contracts/test/ether_token.ts
@@ -1,11 +1,12 @@
-import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
-import { BigNumber, promisify } from '@0xproject/utils';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
+import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import 'make-promises-safe';
 
 import { WETH9Contract } from '../src/generated_contract_wrappers/weth9';
 import { artifacts } from '../src/utils/artifacts';
+import { expectInsufficientFundsAsync, expectRevertOrAlwaysFailingTransactionAsync } from '../src/utils/assertions';
 import { chaiSetup } from '../src/utils/chai_setup';
 import { constants } from '../src/utils/constants';
 import { provider, txDefaults, web3Wrapper } from '../src/utils/web3_wrapper';
@@ -45,9 +46,7 @@ describe('EtherToken', () => {
             const initEthBalance = await web3Wrapper.getBalanceInWeiAsync(account);
             const ethToDeposit = initEthBalance.plus(1);
 
-            return expect(etherToken.deposit.sendTransactionAsync({ value: ethToDeposit })).to.be.rejectedWith(
-                "ender doesn't have enough funds to send tx.",
-            );
+            return expectInsufficientFundsAsync(etherToken.deposit.sendTransactionAsync({ value: ethToDeposit }));
         });
 
         it('should convert deposited Ether to wrapped Ether tokens', async () => {
@@ -76,8 +75,8 @@ describe('EtherToken', () => {
             const initEthTokenBalance = await etherToken.balanceOf.callAsync(account);
             const ethTokensToWithdraw = initEthTokenBalance.plus(1);
 
-            return expect(etherToken.withdraw.sendTransactionAsync(ethTokensToWithdraw)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                etherToken.withdraw.sendTransactionAsync(ethTokensToWithdraw),
             );
         });
 
diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index 1201ef3d9..bee74cca8 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -1,5 +1,5 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { assetProxyUtils, crypto, orderHashUtils } from '@0xproject/order-utils';
+import { assetProxyUtils, orderHashUtils } from '@0xproject/order-utils';
 import { AssetProxyId, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -18,20 +18,20 @@ import {
     FillContractEventArgs,
 } from '../../src/generated_contract_wrappers/exchange';
 import { artifacts } from '../../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
 import { ERC20Wrapper } from '../../src/utils/erc20_wrapper';
 import { ERC721Wrapper } from '../../src/utils/erc721_wrapper';
 import { ExchangeWrapper } from '../../src/utils/exchange_wrapper';
 import { OrderFactory } from '../../src/utils/order_factory';
-import { orderUtils } from '../../src/utils/order_utils';
-import { ContractName, ERC20BalancesByOwner, OrderStatus } from '../../src/utils/types';
+import { ERC20BalancesByOwner } from '../../src/utils/types';
 import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper';
 
 chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-
+// tslint:disable:no-unnecessary-type-assertion
 describe('Exchange core', () => {
     let makerAddress: string;
     let owner: string;
@@ -415,8 +415,8 @@ describe('Exchange core', () => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
-            return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -432,8 +432,8 @@ describe('Exchange core', () => {
             const invalidSigBuff = Buffer.concat([v, invalidR, invalidS, signatureType]);
             const invalidSigHex = `0x${invalidSigBuff.toString('hex')}`;
             signedOrder.signature = invalidSigHex;
-            return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -442,8 +442,8 @@ describe('Exchange core', () => {
                 makerAssetAmount: new BigNumber(0),
             });
 
-            return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -452,19 +452,19 @@ describe('Exchange core', () => {
                 takerAssetAmount: new BigNumber(0),
             });
 
-            return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
         it('should throw if takerAssetFillAmount is 0', async () => {
             signedOrder = orderFactory.newSignedOrder();
 
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, {
                     takerAssetFillAmount: new BigNumber(0),
                 }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw if maker erc20Balances are too low to fill order', async () => {
@@ -472,8 +472,8 @@ describe('Exchange core', () => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
-            return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -481,9 +481,8 @@ describe('Exchange core', () => {
             signedOrder = orderFactory.newSignedOrder({
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18),
             });
-
-            return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -494,11 +493,8 @@ describe('Exchange core', () => {
                 }),
                 constants.AWAIT_TRANSACTION_MINED_MS,
             );
-            // HACK: `rejectWith` returns a "promise-like" type, but not an actual "Promise", so TSLint
-            // complains, even though we do need to `await` it. So we disable the TSLint error below.
-            // tslint:disable-next-line:await-promise
-            await expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -509,11 +505,8 @@ describe('Exchange core', () => {
                 }),
                 constants.AWAIT_TRANSACTION_MINED_MS,
             );
-            // HACK: `rejectWith` returns a "promise-like" type, but not an actual "Promise", so TSLint
-            // complains, even though we do need to `await` it. So we disable the TSLint error below.
-            // tslint:disable-next-line:await-promise
-            await expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -521,16 +514,16 @@ describe('Exchange core', () => {
             signedOrder = orderFactory.newSignedOrder({
                 expirationTimeSeconds: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
             });
-            return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
 
         it('should throw if no value is filled', async () => {
             signedOrder = orderFactory.newSignedOrder();
             await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress);
-            return expect(exchangeWrapper.fillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
             );
         });
     });
@@ -542,8 +535,8 @@ describe('Exchange core', () => {
         });
 
         it('should throw if not sent by maker', async () => {
-            return expect(exchangeWrapper.cancelOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.cancelOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -552,8 +545,8 @@ describe('Exchange core', () => {
                 makerAssetAmount: new BigNumber(0),
             });
 
-            return expect(exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
             );
         });
 
@@ -562,22 +555,21 @@ describe('Exchange core', () => {
                 takerAssetAmount: new BigNumber(0),
             });
 
-            return expect(exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
             );
         });
 
         it('should be able to cancel a full order', async () => {
             await exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress);
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, {
                     takerAssetFillAmount: signedOrder.takerAssetAmount.div(2),
                 }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should log 1 event with correct arguments', async () => {
-            const divisor = 2;
             const res = await exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress);
             expect(res.logs).to.have.length(1);
 
@@ -593,8 +585,8 @@ describe('Exchange core', () => {
 
         it('should throw if already cancelled', async () => {
             await exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress);
-            return expect(exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
             );
         });
 
@@ -602,8 +594,8 @@ describe('Exchange core', () => {
             signedOrder = orderFactory.newSignedOrder({
                 expirationTimeSeconds: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
             });
-            return expect(exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
             );
         });
 
@@ -619,11 +611,11 @@ describe('Exchange core', () => {
             });
 
             const fillTakerAssetAmount2 = new BigNumber(1);
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, {
                     takerAssetFillAmount: fillTakerAssetAmount2,
                 }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
     });
 
@@ -632,16 +624,16 @@ describe('Exchange core', () => {
             const makerEpoch = new BigNumber(1);
             await exchangeWrapper.cancelOrdersUpToAsync(makerEpoch, makerAddress);
             const lesserMakerEpoch = new BigNumber(0);
-            return expect(exchangeWrapper.cancelOrdersUpToAsync(lesserMakerEpoch, makerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.cancelOrdersUpToAsync(lesserMakerEpoch, makerAddress),
             );
         });
 
         it('should fail to set makerEpoch equal to existing makerEpoch', async () => {
             const makerEpoch = new BigNumber(1);
             await exchangeWrapper.cancelOrdersUpToAsync(makerEpoch, makerAddress);
-            return expect(exchangeWrapper.cancelOrdersUpToAsync(makerEpoch, makerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.cancelOrdersUpToAsync(makerEpoch, makerAddress),
             );
         });
 
@@ -675,7 +667,12 @@ describe('Exchange core', () => {
                     salt: new BigNumber(3),
                 }),
             ];
-            await exchangeWrapper.batchFillOrdersNoThrowAsync(signedOrders, takerAddress);
+            await exchangeWrapper.batchFillOrdersNoThrowAsync(signedOrders, takerAddress, {
+                // HACK(albrow): We need to hardcode the gas estimate here because
+                // the Geth gas estimator doesn't work with the way we use
+                // delegatecall and swallow errors.
+                gas: 490000,
+            });
 
             const newBalances = await erc20Wrapper.getBalancesAsync();
             const fillMakerAssetAmount = signedOrders[2].makerAssetAmount.add(signedOrders[3].makerAssetAmount);
@@ -724,6 +721,7 @@ describe('Exchange core', () => {
             expect(initialOwnerTakerAsset).to.be.bignumber.equal(takerAddress);
             // Call Exchange
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
+            // tslint:disable-next-line:no-unused-variable
             const res = await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount });
             // Verify post-conditions
             const newOwnerMakerAsset = await erc721Token.ownerOf.callAsync(makerAssetId);
@@ -749,9 +747,9 @@ describe('Exchange core', () => {
             expect(initialOwnerTakerAsset).to.be.bignumber.equal(takerAddress);
             // Call Exchange
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw when taker does not own the token with id takerAssetId', async () => {
@@ -771,9 +769,9 @@ describe('Exchange core', () => {
             expect(initialOwnerTakerAsset).to.be.bignumber.not.equal(takerAddress);
             // Call Exchange
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw when makerAssetAmount is greater than 1', async () => {
@@ -793,9 +791,9 @@ describe('Exchange core', () => {
             expect(initialOwnerTakerAsset).to.be.bignumber.equal(takerAddress);
             // Call Exchange
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw when takerAssetAmount is greater than 1', async () => {
@@ -815,9 +813,9 @@ describe('Exchange core', () => {
             expect(initialOwnerTakerAsset).to.be.bignumber.equal(takerAddress);
             // Call Exchange
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw on partial fill', async () => {
@@ -837,9 +835,9 @@ describe('Exchange core', () => {
             expect(initialOwnerTakerAsset).to.be.bignumber.equal(takerAddress);
             // Call Exchange
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount }),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should successfully fill order when makerAsset is ERC721 and takerAsset is ERC20', async () => {
@@ -922,4 +920,6 @@ describe('Exchange core', () => {
             );
         });
     });
-}); // tslint:disable-line:max-file-line-count
+});
+// tslint:disable:max-file-line-count
+// tslint:enable:no-unnecessary-type-assertion
diff --git a/packages/contracts/test/exchange/dispatcher.ts b/packages/contracts/test/exchange/dispatcher.ts
index 287bbfe31..02d43a132 100644
--- a/packages/contracts/test/exchange/dispatcher.ts
+++ b/packages/contracts/test/exchange/dispatcher.ts
@@ -3,13 +3,13 @@ import { assetProxyUtils } from '@0xproject/order-utils';
 import { AssetProxyId } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
-import * as Web3 from 'web3';
 
 import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c20_token';
 import { ERC20ProxyContract } from '../../src/generated_contract_wrappers/e_r_c20_proxy';
 import { ERC721ProxyContract } from '../../src/generated_contract_wrappers/e_r_c721_proxy';
 import { TestAssetProxyDispatcherContract } from '../../src/generated_contract_wrappers/test_asset_proxy_dispatcher';
 import { artifacts } from '../../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
 import { ERC20Wrapper } from '../../src/utils/erc20_wrapper';
@@ -23,7 +23,6 @@ const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 describe('AssetProxyDispatcher', () => {
     let owner: string;
     let notOwner: string;
-    let notAuthorized: string;
     let makerAddress: string;
     let takerAddress: string;
 
@@ -45,7 +44,6 @@ describe('AssetProxyDispatcher', () => {
         // Setup accounts & addresses
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const usedAddresses = ([owner, notOwner, makerAddress, takerAddress] = accounts);
-        notAuthorized = notOwner;
 
         erc20Wrapper = new ERC20Wrapper(provider, usedAddresses, owner);
         erc721Wrapper = new ERC721Wrapper(provider, usedAddresses, owner);
@@ -177,14 +175,14 @@ describe('AssetProxyDispatcher', () => {
             const proxyAddress = await assetProxyDispatcher.getAssetProxy.callAsync(AssetProxyId.ERC20);
             expect(proxyAddress).to.be.equal(erc20Proxy.address);
             // The following transaction will throw because the currentAddress is no longer constants.NULL_ADDRESS
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
                     erc20Proxy.address,
                     constants.NULL_ADDRESS,
                     { from: owner },
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should be able to reset proxy address to NULL', async () => {
@@ -218,26 +216,26 @@ describe('AssetProxyDispatcher', () => {
 
         it('should throw if requesting address is not owner', async () => {
             const prevProxyAddress = constants.NULL_ADDRESS;
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC20,
                     erc20Proxy.address,
                     prevProxyAddress,
                     { from: notOwner },
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw if attempting to register a proxy to the incorrect id', async () => {
             const prevProxyAddress = constants.NULL_ADDRESS;
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 assetProxyDispatcher.registerAssetProxy.sendTransactionAsync(
                     AssetProxyId.ERC721,
                     erc20Proxy.address,
                     prevProxyAddress,
                     { from: owner },
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
     });
 
@@ -305,9 +303,8 @@ describe('AssetProxyDispatcher', () => {
             // Construct metadata for ERC20 proxy
             const encodedProxyMetadata = assetProxyUtils.encodeERC20ProxyData(zrxToken.address);
             // Perform a transfer from makerAddress to takerAddress
-            const erc20Balances = await erc20Wrapper.getBalancesAsync();
             const amount = new BigNumber(10);
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 assetProxyDispatcher.publicDispatchTransferFrom.sendTransactionAsync(
                     encodedProxyMetadata,
                     makerAddress,
@@ -315,7 +312,7 @@ describe('AssetProxyDispatcher', () => {
                     amount,
                     { from: owner },
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
     });
 });
diff --git a/packages/contracts/test/exchange/libs.ts b/packages/contracts/test/exchange/libs.ts
index 176ccb87d..b12934014 100644
--- a/packages/contracts/test/exchange/libs.ts
+++ b/packages/contracts/test/exchange/libs.ts
@@ -3,7 +3,6 @@ import { assetProxyUtils, orderHashUtils } from '@0xproject/order-utils';
 import { SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
-import ethUtil = require('ethereumjs-util');
 
 import { TestLibsContract } from '../../src/generated_contract_wrappers/test_libs';
 import { addressUtils } from '../../src/utils/address_utils';
diff --git a/packages/contracts/test/exchange/match_orders.ts b/packages/contracts/test/exchange/match_orders.ts
index db757c393..39e11fd46 100644
--- a/packages/contracts/test/exchange/match_orders.ts
+++ b/packages/contracts/test/exchange/match_orders.ts
@@ -1,23 +1,18 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { assetProxyUtils, crypto } from '@0xproject/order-utils';
-import { AssetProxyId, SignedOrder } from '@0xproject/types';
+import { assetProxyUtils } from '@0xproject/order-utils';
+import { AssetProxyId } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
-import { LogWithDecodedArgs } from 'ethereum-types';
-import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
 
-import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c20_token';
-import { DummyERC721TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c721_token';
-import { ERC20ProxyContract } from '../../src/generated_contract_wrappers/e_r_c20_proxy';
-import { ERC721ProxyContract } from '../../src/generated_contract_wrappers/e_r_c721_proxy';
-import {
-    CancelContractEventArgs,
-    ExchangeContract,
-    FillContractEventArgs,
-} from '../../src/generated_contract_wrappers/exchange';
+import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/generated/dummy_e_r_c20_token';
+import { DummyERC721TokenContract } from '../../src/generated_contract_wrappers/generated/dummy_e_r_c721_token';
+import { ERC20ProxyContract } from '../../src/generated_contract_wrappers/generated/e_r_c20_proxy';
+import { ERC721ProxyContract } from '../../src/generated_contract_wrappers/generated/e_r_c721_proxy';
+import { ExchangeContract } from '../../src/generated_contract_wrappers/generated/exchange';
 import { artifacts } from '../../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
 import { ERC20Wrapper } from '../../src/utils/erc20_wrapper';
@@ -25,13 +20,7 @@ import { ERC721Wrapper } from '../../src/utils/erc721_wrapper';
 import { ExchangeWrapper } from '../../src/utils/exchange_wrapper';
 import { MatchOrderTester } from '../../src/utils/match_order_tester';
 import { OrderFactory } from '../../src/utils/order_factory';
-import {
-    ContractName,
-    ERC20BalancesByOwner,
-    ERC721TokenIdsByOwner,
-    OrderInfo,
-    OrderStatus,
-} from '../../src/utils/types';
+import { ERC20BalancesByOwner, ERC721TokenIdsByOwner, OrderInfo, OrderStatus } from '../../src/utils/types';
 import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper';
 
 chaiSetup.configure();
@@ -64,7 +53,6 @@ describe('matchOrders', () => {
 
     let erc721LeftMakerAssetIds: BigNumber[];
     let erc721RightMakerAssetIds: BigNumber[];
-    let erc721TakerAssetIds: BigNumber[];
 
     let defaultERC20MakerAssetAddress: string;
     let defaultERC20TakerAssetAddress: string;
@@ -103,7 +91,6 @@ describe('matchOrders', () => {
         const erc721Balances = await erc721Wrapper.getBalancesAsync();
         erc721LeftMakerAssetIds = erc721Balances[makerAddressLeft][erc721Token.address];
         erc721RightMakerAssetIds = erc721Balances[makerAddressRight][erc721Token.address];
-        erc721TakerAssetIds = erc721Balances[takerAddress][erc721Token.address];
         // Depoy exchange
         exchange = await ExchangeContract.deployFrom0xArtifactAsync(
             artifacts.Exchange,
@@ -639,9 +626,9 @@ describe('matchOrders', () => {
             // Cancel left order
             await exchangeWrapper.cancelOrderAsync(signedOrderLeft, signedOrderLeft.makerAddress);
             // Match orders
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.matchOrdersAsync(signedOrderLeft, signedOrderRight, takerAddress),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('Should throw if right order is not fillable', async () => {
@@ -665,9 +652,9 @@ describe('matchOrders', () => {
             // Cancel right order
             await exchangeWrapper.cancelOrderAsync(signedOrderRight, signedOrderRight.makerAddress);
             // Match orders
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 exchangeWrapper.matchOrdersAsync(signedOrderLeft, signedOrderRight, takerAddress),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw if there is not a positive spread', async () => {
@@ -689,7 +676,7 @@ describe('matchOrders', () => {
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 matchOrderTester.matchOrdersAndVerifyBalancesAsync(
                     signedOrderLeft,
                     signedOrderRight,
@@ -697,7 +684,7 @@ describe('matchOrders', () => {
                     erc20BalancesByOwner,
                     erc721TokenIdsByOwner,
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw if the left maker asset is not equal to the right taker asset ', async () => {
@@ -719,7 +706,7 @@ describe('matchOrders', () => {
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 matchOrderTester.matchOrdersAndVerifyBalancesAsync(
                     signedOrderLeft,
                     signedOrderRight,
@@ -727,7 +714,7 @@ describe('matchOrders', () => {
                     erc20BalancesByOwner,
                     erc721TokenIdsByOwner,
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should throw if the right maker asset is not equal to the left taker asset', async () => {
@@ -749,7 +736,7 @@ describe('matchOrders', () => {
                 feeRecipientAddress: feeRecipientAddressRight,
             });
             // Match orders
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 matchOrderTester.matchOrdersAndVerifyBalancesAsync(
                     signedOrderLeft,
                     signedOrderRight,
@@ -757,7 +744,7 @@ describe('matchOrders', () => {
                     erc20BalancesByOwner,
                     erc721TokenIdsByOwner,
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should transfer correct amounts when left order maker asset is an ERC721 token', async () => {
diff --git a/packages/contracts/test/exchange/signature_validator.ts b/packages/contracts/test/exchange/signature_validator.ts
index 5232d1486..79db620b4 100644
--- a/packages/contracts/test/exchange/signature_validator.ts
+++ b/packages/contracts/test/exchange/signature_validator.ts
@@ -1,7 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils, orderHashUtils } from '@0xproject/order-utils';
 import { SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
 
diff --git a/packages/contracts/test/exchange/transactions.ts b/packages/contracts/test/exchange/transactions.ts
index 749412658..60e674a95 100644
--- a/packages/contracts/test/exchange/transactions.ts
+++ b/packages/contracts/test/exchange/transactions.ts
@@ -1,16 +1,15 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils, generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { AssetProxyId, Order, OrderWithoutExchangeAddress, SignedOrder } from '@0xproject/types';
+import { AssetProxyId, OrderWithoutExchangeAddress, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
-import * as ethUtil from 'ethereumjs-util';
-import * as Web3 from 'web3';
 
 import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c20_token';
 import { ERC20ProxyContract } from '../../src/generated_contract_wrappers/e_r_c20_proxy';
 import { ExchangeContract } from '../../src/generated_contract_wrappers/exchange';
 import { WhitelistContract } from '../../src/generated_contract_wrappers/whitelist';
 import { artifacts } from '../../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
 import { ERC20Wrapper } from '../../src/utils/erc20_wrapper';
@@ -18,7 +17,7 @@ import { ExchangeWrapper } from '../../src/utils/exchange_wrapper';
 import { OrderFactory } from '../../src/utils/order_factory';
 import { orderUtils } from '../../src/utils/order_utils';
 import { TransactionFactory } from '../../src/utils/transaction_factory';
-import { ERC20BalancesByOwner, OrderStatus, SignedTransaction } from '../../src/utils/types';
+import { ERC20BalancesByOwner, SignedTransaction } from '../../src/utils/types';
 import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper';
 
 chaiSetup.configure();
@@ -126,8 +125,8 @@ describe('Exchange transactions', () => {
             });
 
             it('should throw if not called by specified sender', async () => {
-                return expect(exchangeWrapper.executeTransactionAsync(signedTx, takerAddress)).to.be.rejectedWith(
-                    constants.REVERT,
+                return expectRevertOrAlwaysFailingTransactionAsync(
+                    exchangeWrapper.executeTransactionAsync(signedTx, takerAddress),
                 );
             });
 
@@ -168,8 +167,8 @@ describe('Exchange transactions', () => {
 
             it('should throw if the a 0x transaction with the same transactionHash has already been executed', async () => {
                 await exchangeWrapper.executeTransactionAsync(signedTx, senderAddress);
-                return expect(exchangeWrapper.executeTransactionAsync(signedTx, senderAddress)).to.be.rejectedWith(
-                    constants.REVERT,
+                return expectRevertOrAlwaysFailingTransactionAsync(
+                    exchangeWrapper.executeTransactionAsync(signedTx, senderAddress),
                 );
             });
 
@@ -187,15 +186,15 @@ describe('Exchange transactions', () => {
             });
 
             it('should throw if not called by specified sender', async () => {
-                return expect(exchangeWrapper.executeTransactionAsync(signedTx, makerAddress)).to.be.rejectedWith(
-                    constants.REVERT,
+                return expectRevertOrAlwaysFailingTransactionAsync(
+                    exchangeWrapper.executeTransactionAsync(signedTx, makerAddress),
                 );
             });
 
             it('should cancel the order when signed by maker and called by sender', async () => {
                 await exchangeWrapper.executeTransactionAsync(signedTx, senderAddress);
-                return expect(exchangeWrapper.fillOrderAsync(signedOrder, senderAddress)).to.be.rejectedWith(
-                    constants.REVERT,
+                return expectRevertOrAlwaysFailingTransactionAsync(
+                    exchangeWrapper.fillOrderAsync(signedOrder, senderAddress),
                 );
             });
         });
@@ -244,7 +243,7 @@ describe('Exchange transactions', () => {
             orderWithoutExchangeAddress = orderUtils.getOrderWithoutExchangeAddress(signedOrder);
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
             const salt = generatePseudoRandomSalt();
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 whitelist.fillOrderIfWhitelisted.sendTransactionAsync(
                     orderWithoutExchangeAddress,
                     takerAssetFillAmount,
@@ -252,7 +251,7 @@ describe('Exchange transactions', () => {
                     signedOrder.signature,
                     { from: takerAddress },
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should revert if taker has not been whitelisted', async () => {
@@ -264,7 +263,7 @@ describe('Exchange transactions', () => {
             orderWithoutExchangeAddress = orderUtils.getOrderWithoutExchangeAddress(signedOrder);
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
             const salt = generatePseudoRandomSalt();
-            return expect(
+            return expectRevertOrAlwaysFailingTransactionAsync(
                 whitelist.fillOrderIfWhitelisted.sendTransactionAsync(
                     orderWithoutExchangeAddress,
                     takerAssetFillAmount,
@@ -272,7 +271,7 @@ describe('Exchange transactions', () => {
                     signedOrder.signature,
                     { from: takerAddress },
                 ),
-            ).to.be.rejectedWith(constants.REVERT);
+            );
         });
 
         it('should fill the order if maker and taker have been whitelisted', async () => {
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index 330c0ba3f..b5e8b4125 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -1,4 +1,4 @@
-import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { assetProxyUtils } from '@0xproject/order-utils';
 import { AssetProxyId, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
@@ -6,15 +6,14 @@ import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import * as _ from 'lodash';
 import 'make-promises-safe';
-import * as Web3 from 'web3';
-
-import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c20_token';
-import { DummyERC721TokenContract } from '../../src/generated_contract_wrappers/dummy_e_r_c721_token';
-import { ERC20ProxyContract } from '../../src/generated_contract_wrappers/e_r_c20_proxy';
-import { ERC721ProxyContract } from '../../src/generated_contract_wrappers/e_r_c721_proxy';
-import { ExchangeContract } from '../../src/generated_contract_wrappers/exchange';
-import { TokenRegistryContract } from '../../src/generated_contract_wrappers/token_registry';
+
+import { DummyERC20TokenContract } from '../../src/generated_contract_wrappers/generated/dummy_e_r_c20_token';
+import { DummyERC721TokenContract } from '../../src/generated_contract_wrappers/generated/dummy_e_r_c721_token';
+import { ERC20ProxyContract } from '../../src/generated_contract_wrappers/generated/e_r_c20_proxy';
+import { ERC721ProxyContract } from '../../src/generated_contract_wrappers/generated/e_r_c721_proxy';
+import { ExchangeContract } from '../../src/generated_contract_wrappers/generated/exchange';
 import { artifacts } from '../../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
 import { ERC20Wrapper } from '../../src/utils/erc20_wrapper';
@@ -172,8 +171,8 @@ describe('Exchange wrappers', () => {
                 expirationTimeSeconds: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
             });
 
-            return expect(exchangeWrapper.fillOrKillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrKillOrderAsync(signedOrder, takerAddress),
             );
         });
 
@@ -184,8 +183,8 @@ describe('Exchange wrappers', () => {
                 takerAssetFillAmount: signedOrder.takerAssetAmount.div(2),
             });
 
-            return expect(exchangeWrapper.fillOrKillOrderAsync(signedOrder, takerAddress)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                exchangeWrapper.fillOrKillOrderAsync(signedOrder, takerAddress),
             );
         });
     });
@@ -197,12 +196,16 @@ describe('Exchange wrappers', () => {
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
             const takerAssetFillAmount = signedOrder.takerAssetAmount.div(2);
+
             await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress, {
                 takerAssetFillAmount,
+                // HACK(albrow): We need to hardcode the gas estimate here because
+                // the Geth gas estimator doesn't work with the way we use
+                // delegatecall and swallow errors.
+                gas: 250000,
             });
 
             const newBalances = await erc20Wrapper.getBalancesAsync();
-
             const makerAssetFilledAmount = takerAssetFillAmount
                 .times(signedOrder.makerAssetAmount)
                 .dividedToIntegerBy(signedOrder.takerAssetAmount);
@@ -212,6 +215,7 @@ describe('Exchange wrappers', () => {
             const takerFee = signedOrder.takerFee
                 .times(makerAssetFilledAmount)
                 .dividedToIntegerBy(signedOrder.makerAssetAmount);
+
             expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
                 erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFilledAmount),
             );
@@ -360,7 +364,13 @@ describe('Exchange wrappers', () => {
             expect(initialOwnerTakerAsset).to.be.bignumber.equal(takerAddress);
             // Call Exchange
             const takerAssetFillAmount = signedOrder.takerAssetAmount;
-            await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress, { takerAssetFillAmount });
+            await exchangeWrapper.fillOrderNoThrowAsync(signedOrder, takerAddress, {
+                takerAssetFillAmount,
+                // HACK(albrow): We need to hardcode the gas estimate here because
+                // the Geth gas estimator doesn't work with the way we use
+                // delegatecall and swallow errors.
+                gas: 270000,
+            });
             // Verify post-conditions
             const newOwnerMakerAsset = await erc721Token.ownerOf.callAsync(makerAssetId);
             expect(newOwnerMakerAsset).to.be.bignumber.equal(takerAddress);
@@ -485,11 +495,11 @@ describe('Exchange wrappers', () => {
 
                 await exchangeWrapper.fillOrKillOrderAsync(signedOrders[0], takerAddress);
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.batchFillOrKillOrdersAsync(signedOrders, takerAddress, {
                         takerAssetFillAmounts,
                     }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
@@ -535,6 +545,10 @@ describe('Exchange wrappers', () => {
 
                 await exchangeWrapper.batchFillOrdersNoThrowAsync(signedOrders, takerAddress, {
                     takerAssetFillAmounts,
+                    // HACK(albrow): We need to hardcode the gas estimate here because
+                    // the Geth gas estimator doesn't work with the way we use
+                    // delegatecall and swallow errors.
+                    gas: 600000,
                 });
 
                 const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -591,6 +605,10 @@ describe('Exchange wrappers', () => {
                 const newOrders = [invalidOrder, ...validOrders];
                 await exchangeWrapper.batchFillOrdersNoThrowAsync(newOrders, takerAddress, {
                     takerAssetFillAmounts,
+                    // HACK(albrow): We need to hardcode the gas estimate here because
+                    // the Geth gas estimator doesn't work with the way we use
+                    // delegatecall and swallow errors.
+                    gas: 450000,
                 });
 
                 const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -679,11 +697,11 @@ describe('Exchange wrappers', () => {
                     orderFactory.newSignedOrder(),
                 ];
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.marketSellOrdersAsync(signedOrders, takerAddress, {
                         takerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
@@ -753,6 +771,10 @@ describe('Exchange wrappers', () => {
                 });
                 await exchangeWrapper.marketSellOrdersNoThrowAsync(signedOrders, takerAddress, {
                     takerAssetFillAmount,
+                    // HACK(albrow): We need to hardcode the gas estimate here because
+                    // the Geth gas estimator doesn't work with the way we use
+                    // delegatecall and swallow errors.
+                    gas: 600000,
                 });
 
                 const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -768,11 +790,11 @@ describe('Exchange wrappers', () => {
                     orderFactory.newSignedOrder(),
                 ];
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.marketSellOrdersNoThrowAsync(signedOrders, takerAddress, {
                         takerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
@@ -857,11 +879,11 @@ describe('Exchange wrappers', () => {
                     orderFactory.newSignedOrder(),
                 ];
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.marketBuyOrdersAsync(signedOrders, takerAddress, {
                         makerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
@@ -931,6 +953,10 @@ describe('Exchange wrappers', () => {
                 });
                 await exchangeWrapper.marketSellOrdersNoThrowAsync(signedOrders, takerAddress, {
                     takerAssetFillAmount,
+                    // HACK(albrow): We need to hardcode the gas estimate here because
+                    // the Geth gas estimator doesn't work with the way we use
+                    // delegatecall and swallow errors.
+                    gas: 600000,
                 });
 
                 const newBalances = await erc20Wrapper.getBalancesAsync();
@@ -946,11 +972,11 @@ describe('Exchange wrappers', () => {
                     orderFactory.newSignedOrder(),
                 ];
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     exchangeWrapper.marketBuyOrdersNoThrowAsync(signedOrders, takerAddress, {
                         makerAssetFillAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), 18),
                     }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
diff --git a/packages/contracts/test/libraries/lib_bytes.ts b/packages/contracts/test/libraries/lib_bytes.ts
index c8aecea90..355e3603c 100644
--- a/packages/contracts/test/libraries/lib_bytes.ts
+++ b/packages/contracts/test/libraries/lib_bytes.ts
@@ -1,15 +1,12 @@
-import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
-import { AssetProxyId } from '@0xproject/types';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import BN = require('bn.js');
 import * as chai from 'chai';
-import { LogWithDecodedArgs, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
 import ethUtil = require('ethereumjs-util');
-import * as Web3 from 'web3';
 
 import { TestLibBytesContract } from '../../src/generated_contract_wrappers/test_lib_bytes';
 import { artifacts } from '../../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync, expectRevertOrOtherErrorAsync } from '../../src/utils/assertions';
 import { chaiSetup } from '../../src/utils/chai_setup';
 import { constants } from '../../src/utils/constants';
 import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper';
@@ -19,7 +16,6 @@ const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 
 describe('LibBytes', () => {
-    let owner: string;
     let libBytes: TestLibBytesContract;
     const byteArrayShorterThan32Bytes = '0x012345';
     const byteArrayShorterThan20Bytes = byteArrayShorterThan32Bytes;
@@ -42,7 +38,6 @@ describe('LibBytes', () => {
     before(async () => {
         // Setup accounts & addresses
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
-        owner = accounts[0];
         testAddress = accounts[1];
         // Deploy LibBytes
         libBytes = await TestLibBytesContract.deployFrom0xArtifactAsync(artifacts.TestLibBytes, provider, txDefaults);
@@ -63,7 +58,10 @@ describe('LibBytes', () => {
 
     describe('popByte', () => {
         it('should revert if length is 0', async () => {
-            return expect(libBytes.publicPopByte.callAsync(constants.NULL_BYTES)).to.be.rejectedWith(constants.REVERT);
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicPopByte.callAsync(constants.NULL_BYTES),
+                constants.LIB_BYTES_GT_ZERO_LENGTH_REQUIRED,
+            );
         });
 
         it('should pop the last byte from the input and return it', async () => {
@@ -77,8 +75,9 @@ describe('LibBytes', () => {
 
     describe('popAddress', () => {
         it('should revert if length is less than 20', async () => {
-            return expect(libBytes.publicPopAddress.callAsync(byteArrayShorterThan20Bytes)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicPopAddress.callAsync(byteArrayShorterThan20Bytes),
+                constants.LIB_BYTES_GTE_20_LENGTH_REQUIRED,
             );
         });
 
@@ -162,16 +161,18 @@ describe('LibBytes', () => {
         it('should fail if the byte array is too short to hold an address)', async () => {
             const shortByteArray = '0xabcdef';
             const offset = new BigNumber(0);
-            return expect(libBytes.publicReadAddress.callAsync(shortByteArray, offset)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicReadAddress.callAsync(shortByteArray, offset),
+                constants.LIB_BYTES_GTE_20_LENGTH_REQUIRED,
             );
         });
 
         it('should fail if the length between the offset and end of the byte array is too short to hold an address)', async () => {
             const byteArray = ethUtil.addHexPrefix(testAddress);
             const badOffset = new BigNumber(ethUtil.toBuffer(byteArray).byteLength);
-            return expect(libBytes.publicReadAddress.callAsync(byteArray, badOffset)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicReadAddress.callAsync(byteArray, badOffset),
+                constants.LIB_BYTES_GTE_20_LENGTH_REQUIRED,
             );
         });
     });
@@ -206,15 +207,17 @@ describe('LibBytes', () => {
 
         it('should fail if the byte array is too short to hold a bytes32)', async () => {
             const offset = new BigNumber(0);
-            return expect(libBytes.publicReadBytes32.callAsync(byteArrayShorterThan32Bytes, offset)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicReadBytes32.callAsync(byteArrayShorterThan32Bytes, offset),
+                constants.LIB_BYTES_GTE_32_LENGTH_REQUIRED,
             );
         });
 
         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 expect(libBytes.publicReadBytes32.callAsync(testBytes32, badOffset)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicReadBytes32.callAsync(testBytes32, badOffset),
+                constants.LIB_BYTES_GTE_32_LENGTH_REQUIRED,
             );
         });
     });
@@ -253,8 +256,9 @@ describe('LibBytes', () => {
 
         it('should fail if the byte array is too short to hold a uint256)', async () => {
             const offset = new BigNumber(0);
-            return expect(libBytes.publicReadUint256.callAsync(byteArrayShorterThan32Bytes, offset)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicReadUint256.callAsync(byteArrayShorterThan32Bytes, offset),
+                constants.LIB_BYTES_GTE_32_LENGTH_REQUIRED,
             );
         });
 
@@ -263,8 +267,9 @@ describe('LibBytes', () => {
             const testUint256AsBuffer = ethUtil.toBuffer(formattedTestUint256);
             const byteArray = ethUtil.bufferToHex(testUint256AsBuffer);
             const badOffset = new BigNumber(testUint256AsBuffer.byteLength);
-            return expect(libBytes.publicReadUint256.callAsync(byteArray, badOffset)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicReadUint256.callAsync(byteArray, badOffset),
+                constants.LIB_BYTES_GTE_32_LENGTH_REQUIRED,
             );
         });
     });
@@ -281,10 +286,12 @@ describe('LibBytes', () => {
     */
 
     describe('readFirst4', () => {
+        // AssertionError: expected promise to be rejected with an error including 'revert' but it was fulfilled with '0x08c379a0'
         it('should revert if byte array has a length < 4', async () => {
             const byteArrayLessThan4Bytes = '0x010101';
-            return expect(libBytes.publicReadFirst4.callAsync(byteArrayLessThan4Bytes)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                libBytes.publicReadFirst4.callAsync(byteArrayLessThan4Bytes),
+                constants.LIB_BYTES_GTE_4_LENGTH_REQUIRED,
             );
         });
         it('should return the first 4 bytes of a byte array of arbitrary length', async () => {
diff --git a/packages/contracts/test/multi_sig_with_time_lock.ts b/packages/contracts/test/multi_sig_with_time_lock.ts
index 930ff485a..f630743e1 100644
--- a/packages/contracts/test/multi_sig_with_time_lock.ts
+++ b/packages/contracts/test/multi_sig_with_time_lock.ts
@@ -1,26 +1,25 @@
-import { BlockchainLifecycle, web3Factory } from '@0xproject/dev-utils';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import { LogWithDecodedArgs } from 'ethereum-types';
-import * as _ from 'lodash';
 import 'make-promises-safe';
-import * as Web3 from 'web3';
 
 import {
     MultiSigWalletWithTimeLockContract,
     SubmissionContractEventArgs,
 } from '../src/generated_contract_wrappers/multi_sig_wallet_with_time_lock';
 import { artifacts } from '../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../src/utils/assertions';
 import { chaiSetup } from '../src/utils/chai_setup';
 import { constants } from '../src/utils/constants';
+import { increaseTimeAndMineBlockAsync } from '../src/utils/increase_time';
 import { MultiSigWrapper } from '../src/utils/multi_sig_wrapper';
 import { provider, txDefaults, web3Wrapper } from '../src/utils/web3_wrapper';
 
 chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-
+// tslint:disable:no-unnecessary-type-assertion
 describe('MultiSigWalletWithTimeLock', () => {
     let owners: string[];
     const REQUIRED_APPROVALS = new BigNumber(2);
@@ -69,9 +68,9 @@ describe('MultiSigWalletWithTimeLock', () => {
             });
 
             it('should throw when not called by wallet', async () => {
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     multiSig.changeTimeLock.sendTransactionAsync(SECONDS_TIME_LOCKED, { from: owners[0] }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should throw without enough confirmations', async () => {
@@ -80,10 +79,9 @@ describe('MultiSigWalletWithTimeLock', () => {
                 const res = await multiSigWrapper.submitTransactionAsync(destination, changeTimeLockData, owners[0]);
                 const log = res.logs[0] as LogWithDecodedArgs<SubmissionContractEventArgs>;
                 const txId = log.args.transactionId;
-
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     multiSig.executeTransaction.sendTransactionAsync(txId, { from: owners[0] }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should set confirmation time with enough confirmations', async () => {
@@ -148,14 +146,15 @@ describe('MultiSigWalletWithTimeLock', () => {
                 txId = log.args.transactionId;
                 await multiSigWrapper.confirmTransactionAsync(txId, owners[1]);
             });
+
             it('should throw if it has enough confirmations but is not past the time lock', async () => {
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     multiSig.executeTransaction.sendTransactionAsync(txId, { from: owners[0] }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should execute if it has enough confirmations and is past the time lock', async () => {
-                await web3Wrapper.increaseTimeAsync(SECONDS_TIME_LOCKED.toNumber());
+                await increaseTimeAndMineBlockAsync(SECONDS_TIME_LOCKED.toNumber());
                 await web3Wrapper.awaitTransactionSuccessAsync(
                     await multiSig.executeTransaction.sendTransactionAsync(txId, { from: owners[0] }),
                     constants.AWAIT_TRANSACTION_MINED_MS,
@@ -167,3 +166,4 @@ describe('MultiSigWalletWithTimeLock', () => {
         });
     });
 });
+// tslint:enable:no-unnecessary-type-assertion
diff --git a/packages/contracts/test/token_registry.ts b/packages/contracts/test/token_registry.ts
index e996f4478..f368fd73d 100644
--- a/packages/contracts/test/token_registry.ts
+++ b/packages/contracts/test/token_registry.ts
@@ -1,14 +1,13 @@
-import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber, NULL_BYTES } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
 import 'make-promises-safe';
-import * as Web3 from 'web3';
 
 import { TokenRegistryContract } from '../src/generated_contract_wrappers/token_registry';
 import { artifacts } from '../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync } from '../src/utils/assertions';
 import { chaiSetup } from '../src/utils/chai_setup';
 import { constants } from '../src/utils/constants';
 import { TokenRegWrapper } from '../src/utils/token_registry_wrapper';
@@ -76,7 +75,7 @@ describe('TokenRegistry', () => {
 
     describe('addToken', () => {
         it('should throw when not called by owner', async () => {
-            return expect(tokenRegWrapper.addTokenAsync(token1, notOwner)).to.be.rejectedWith(constants.REVERT);
+            return expectRevertOrAlwaysFailingTransactionAsync(tokenRegWrapper.addTokenAsync(token1, notOwner));
         });
 
         it('should add token metadata when called by owner', async () => {
@@ -88,19 +87,19 @@ describe('TokenRegistry', () => {
         it('should throw if token already exists', async () => {
             await tokenRegWrapper.addTokenAsync(token1, owner);
 
-            return expect(tokenRegWrapper.addTokenAsync(token1, owner)).to.be.rejectedWith(constants.REVERT);
+            return expectRevertOrAlwaysFailingTransactionAsync(tokenRegWrapper.addTokenAsync(token1, owner));
         });
 
         it('should throw if token address is null', async () => {
-            return expect(tokenRegWrapper.addTokenAsync(nullToken, owner)).to.be.rejectedWith(constants.REVERT);
+            return expectRevertOrAlwaysFailingTransactionAsync(tokenRegWrapper.addTokenAsync(nullToken, owner));
         });
 
         it('should throw if name already exists', async () => {
             await tokenRegWrapper.addTokenAsync(token1, owner);
             const duplicateNameToken = _.assign({}, token2, { name: token1.name });
 
-            return expect(tokenRegWrapper.addTokenAsync(duplicateNameToken, owner)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                tokenRegWrapper.addTokenAsync(duplicateNameToken, owner),
             );
         });
 
@@ -110,8 +109,8 @@ describe('TokenRegistry', () => {
                 symbol: token1.symbol,
             });
 
-            return expect(tokenRegWrapper.addTokenAsync(duplicateSymbolToken, owner)).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrAlwaysFailingTransactionAsync(
+                tokenRegWrapper.addTokenAsync(duplicateSymbolToken, owner),
             );
         });
     });
@@ -137,9 +136,9 @@ describe('TokenRegistry', () => {
 
         describe('setTokenName', () => {
             it('should throw when not called by owner', async () => {
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.setTokenName.sendTransactionAsync(token1.address, token2.name, { from: notOwner }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should change the token name when called by owner', async () => {
@@ -163,25 +162,25 @@ describe('TokenRegistry', () => {
             it('should throw if the name already exists', async () => {
                 await tokenRegWrapper.addTokenAsync(token2, owner);
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.setTokenName.sendTransactionAsync(token1.address, token2.name, { from: owner }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should throw if token does not exist', async () => {
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.setTokenName.sendTransactionAsync(nullToken.address, token2.name, { from: owner }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
         describe('setTokenSymbol', () => {
             it('should throw when not called by owner', async () => {
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.setTokenSymbol.sendTransactionAsync(token1.address, token2.symbol, {
                         from: notOwner,
                     }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should change the token symbol when called by owner', async () => {
@@ -203,28 +202,28 @@ describe('TokenRegistry', () => {
             it('should throw if the symbol already exists', async () => {
                 await tokenRegWrapper.addTokenAsync(token2, owner);
 
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.setTokenSymbol.sendTransactionAsync(token1.address, token2.symbol, {
                         from: owner,
                     }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should throw if token does not exist', async () => {
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.setTokenSymbol.sendTransactionAsync(nullToken.address, token2.symbol, {
                         from: owner,
                     }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
 
         describe('removeToken', () => {
             it('should throw if not called by owner', async () => {
                 const index = new BigNumber(0);
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.removeToken.sendTransactionAsync(token1.address, index, { from: notOwner }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should remove token metadata when called by owner', async () => {
@@ -241,17 +240,17 @@ describe('TokenRegistry', () => {
 
             it('should throw if token does not exist', async () => {
                 const index = new BigNumber(0);
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.removeToken.sendTransactionAsync(nullToken.address, index, { from: owner }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
 
             it('should throw if token at given index does not match address', async () => {
                 await tokenRegWrapper.addTokenAsync(token2, owner);
                 const incorrectIndex = new BigNumber(0);
-                return expect(
+                return expectRevertOrAlwaysFailingTransactionAsync(
                     tokenReg.removeToken.sendTransactionAsync(token2.address, incorrectIndex, { from: owner }),
-                ).to.be.rejectedWith(constants.REVERT);
+                );
             });
         });
     });
diff --git a/packages/contracts/test/unlimited_allowance_token.ts b/packages/contracts/test/unlimited_allowance_token.ts
index 92e9fc216..35315090b 100644
--- a/packages/contracts/test/unlimited_allowance_token.ts
+++ b/packages/contracts/test/unlimited_allowance_token.ts
@@ -1,12 +1,11 @@
-import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import 'make-promises-safe';
-import * as Web3 from 'web3';
 
 import { DummyERC20TokenContract } from '../src/generated_contract_wrappers/dummy_e_r_c20_token';
 import { artifacts } from '../src/utils/artifacts';
+import { expectRevertOrAlwaysFailingTransactionAsync, expectRevertOrOtherErrorAsync } from '../src/utils/assertions';
 import { chaiSetup } from '../src/utils/chai_setup';
 import { constants } from '../src/utils/constants';
 import { provider, txDefaults, web3Wrapper } from '../src/utils/web3_wrapper';
@@ -55,8 +54,9 @@ describe('UnlimitedAllowanceToken', () => {
         it('should throw if owner has insufficient balance', async () => {
             const ownerBalance = await token.balanceOf.callAsync(owner);
             const amountToTransfer = ownerBalance.plus(1);
-            return expect(token.transfer.callAsync(spender, amountToTransfer, { from: owner })).to.be.rejectedWith(
-                constants.REVERT,
+            return expectRevertOrOtherErrorAsync(
+                token.transfer.callAsync(spender, amountToTransfer, { from: owner }),
+                constants.ERC20_INSUFFICIENT_BALANCE,
             );
         });
 
@@ -93,11 +93,12 @@ describe('UnlimitedAllowanceToken', () => {
                 await token.approve.sendTransactionAsync(spender, amountToTransfer, { from: owner }),
                 constants.AWAIT_TRANSACTION_MINED_MS,
             );
-            return expect(
+            return expectRevertOrOtherErrorAsync(
                 token.transferFrom.callAsync(owner, spender, amountToTransfer, {
                     from: spender,
                 }),
-            ).to.be.rejectedWith(constants.REVERT);
+                constants.ERC20_INSUFFICIENT_BALANCE,
+            );
         });
 
         it('should throw if spender has insufficient allowance', async () => {
@@ -108,11 +109,12 @@ describe('UnlimitedAllowanceToken', () => {
             const isSpenderAllowanceInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
             expect(isSpenderAllowanceInsufficient).to.be.true();
 
-            return expect(
+            return expectRevertOrOtherErrorAsync(
                 token.transferFrom.callAsync(owner, spender, amountToTransfer, {
                     from: spender,
                 }),
-            ).to.be.rejectedWith(constants.REVERT);
+                constants.ERC20_INSUFFICIENT_ALLOWANCE,
+            );
         });
 
         it('should return true on a 0 value transfer', async () => {
diff --git a/packages/contracts/test/zrx_token.ts b/packages/contracts/test/zrx_token.ts
index 4493ff7a1..996030000 100644
--- a/packages/contracts/test/zrx_token.ts
+++ b/packages/contracts/test/zrx_token.ts
@@ -1,9 +1,8 @@
-import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as chai from 'chai';
 import 'make-promises-safe';
-import * as Web3 from 'web3';
 
 import { ZRXTokenContract } from '../src/generated_contract_wrappers/zrx_token';
 import { artifacts } from '../src/utils/artifacts';