Merge branch 'v2-prototype' into feature/order-watcher-v2

25 files changed, 500 insertions, 178 deletions

diff --git a/packages/contracts/test/exchange/core.ts b/packages/contracts/test/exchange/core.ts
index d9f3851d1..1eb6f2a5c 100644
--- a/packages/contracts/test/exchange/core.ts
+++ b/packages/contracts/test/exchange/core.ts
@@ -15,13 +15,14 @@ import { ERC721ProxyContract } from '../../generated_contract_wrappers/erc721_pr
 import { ExchangeCancelEventArgs, ExchangeContract } from '../../generated_contract_wrappers/exchange';
 import { artifacts } from '../utils/artifacts';
 import { expectTransactionFailedAsync } from '../utils/assertions';
+import { getLatestBlockTimestampAsync, increaseTimeAndMineBlockAsync } from '../utils/block_timestamp';
 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 { ERC20BalancesByOwner } from '../utils/types';
+import { ERC20BalancesByOwner, OrderStatus } from '../utils/types';
 import { provider, txDefaults, web3Wrapper } from '../utils/web3_wrapper';
 
 chaiSetup.configure();
@@ -129,11 +130,11 @@ describe('Exchange core', () => {
     describe('fillOrder', () => {
         beforeEach(async () => {
             erc20Balances = await erc20Wrapper.getBalancesAsync();
-            signedOrder = orderFactory.newSignedOrder();
+            signedOrder = await orderFactory.newSignedOrderAsync();
         });
 
         it('should throw if signature is invalid', async () => {
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
             });
 
@@ -151,7 +152,7 @@ describe('Exchange core', () => {
         });
 
         it('should throw if no value is filled', async () => {
-            signedOrder = orderFactory.newSignedOrder();
+            signedOrder = await orderFactory.newSignedOrderAsync();
             await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress);
             return expectTransactionFailedAsync(
                 exchangeWrapper.fillOrderAsync(signedOrder, takerAddress),
@@ -163,7 +164,7 @@ describe('Exchange core', () => {
     describe('cancelOrder', () => {
         beforeEach(async () => {
             erc20Balances = await erc20Wrapper.getBalancesAsync();
-            signedOrder = orderFactory.newSignedOrder();
+            signedOrder = await orderFactory.newSignedOrderAsync();
         });
 
         it('should throw if not sent by maker', async () => {
@@ -174,7 +175,7 @@ describe('Exchange core', () => {
         });
 
         it('should throw if makerAssetAmount is 0', async () => {
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(0),
             });
 
@@ -185,7 +186,7 @@ describe('Exchange core', () => {
         });
 
         it('should throw if takerAssetAmount is 0', async () => {
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 takerAssetAmount: new BigNumber(0),
             });
 
@@ -229,8 +230,9 @@ describe('Exchange core', () => {
         });
 
         it('should throw if order is expired', async () => {
-            signedOrder = orderFactory.newSignedOrder({
-                expirationTimeSeconds: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
+            const currentTimestamp = await getLatestBlockTimestampAsync();
+            signedOrder = await orderFactory.newSignedOrderAsync({
+                expirationTimeSeconds: new BigNumber(currentTimestamp).sub(10),
             });
             return expectTransactionFailedAsync(
                 exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress),
@@ -239,7 +241,7 @@ describe('Exchange core', () => {
         });
 
         it('should throw if rounding error is greater than 0.1%', async () => {
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1001),
                 takerAssetAmount: new BigNumber(3),
             });
@@ -288,22 +290,22 @@ describe('Exchange core', () => {
             // Since we cancelled with orderEpoch=1, orders with orderEpoch<=1 will not be processed
             erc20Balances = await erc20Wrapper.getBalancesAsync();
             const signedOrders = [
-                orderFactory.newSignedOrder({
+                await orderFactory.newSignedOrderAsync({
                     makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(9), 18),
                     takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(9), 18),
                     salt: new BigNumber(0),
                 }),
-                orderFactory.newSignedOrder({
+                await orderFactory.newSignedOrderAsync({
                     makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(79), 18),
                     takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(79), 18),
                     salt: new BigNumber(1),
                 }),
-                orderFactory.newSignedOrder({
+                await orderFactory.newSignedOrderAsync({
                     makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(979), 18),
                     takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(979), 18),
                     salt: new BigNumber(2),
                 }),
-                orderFactory.newSignedOrder({
+                await orderFactory.newSignedOrderAsync({
                     makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(7979), 18),
                     takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(7979), 18),
                     salt: new BigNumber(3),
@@ -350,7 +352,7 @@ describe('Exchange core', () => {
             // Construct Exchange parameters
             const makerAssetId = erc721TakerAssetIds[0];
             const takerAssetId = erc721TakerAssetIds[1];
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerAssetAmount: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
@@ -373,7 +375,7 @@ describe('Exchange core', () => {
             // Construct Exchange parameters
             const makerAssetId = erc721MakerAssetIds[0];
             const takerAssetId = erc721MakerAssetIds[1];
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerAssetAmount: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
@@ -396,7 +398,7 @@ describe('Exchange core', () => {
             // Construct Exchange parameters
             const makerAssetId = erc721MakerAssetIds[0];
             const takerAssetId = erc721TakerAssetIds[0];
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(2),
                 takerAssetAmount: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
@@ -419,7 +421,7 @@ describe('Exchange core', () => {
             // Construct Exchange parameters
             const makerAssetId = erc721MakerAssetIds[0];
             const takerAssetId = erc721TakerAssetIds[0];
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerAssetAmount: new BigNumber(500),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
@@ -441,7 +443,7 @@ describe('Exchange core', () => {
         it('should throw on partial fill', async () => {
             // Construct Exchange parameters
             const makerAssetId = erc721MakerAssetIds[0];
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
@@ -462,7 +464,7 @@ describe('Exchange core', () => {
             const makerAssetData = assetProxyUtils
                 .encodeERC721AssetData(erc721Token.address, makerAssetId)
                 .slice(0, -2);
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerAssetAmount: new BigNumber(1),
                 makerAssetData,
@@ -481,6 +483,124 @@ describe('Exchange core', () => {
             );
         });
     });
+
+    describe('getOrderInfo', () => {
+        beforeEach(async () => {
+            signedOrder = await orderFactory.newSignedOrderAsync();
+        });
+        it('should return the correct orderInfo for an unfilled valid order', async () => {
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = new BigNumber(0);
+            const expectedOrderStatus = OrderStatus.FILLABLE;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for a fully filled order', async () => {
+            await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress);
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = signedOrder.takerAssetAmount;
+            const expectedOrderStatus = OrderStatus.FULLY_FILLED;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for a partially filled order', async () => {
+            const takerAssetFillAmount = signedOrder.takerAssetAmount.div(2);
+            await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount });
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = takerAssetFillAmount;
+            const expectedOrderStatus = OrderStatus.FILLABLE;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for a cancelled and unfilled order', async () => {
+            await exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress);
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = new BigNumber(0);
+            const expectedOrderStatus = OrderStatus.CANCELLED;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for a cancelled and partially filled order', async () => {
+            const takerAssetFillAmount = signedOrder.takerAssetAmount.div(2);
+            await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount });
+            await exchangeWrapper.cancelOrderAsync(signedOrder, makerAddress);
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = takerAssetFillAmount;
+            const expectedOrderStatus = OrderStatus.CANCELLED;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for an expired and unfilled order', async () => {
+            const currentTimestamp = await getLatestBlockTimestampAsync();
+            const timeUntilExpiration = signedOrder.expirationTimeSeconds.minus(currentTimestamp).toNumber();
+            await increaseTimeAndMineBlockAsync(timeUntilExpiration);
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = new BigNumber(0);
+            const expectedOrderStatus = OrderStatus.EXPIRED;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for an expired and partially filled order', async () => {
+            const takerAssetFillAmount = signedOrder.takerAssetAmount.div(2);
+            await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, { takerAssetFillAmount });
+            const currentTimestamp = await getLatestBlockTimestampAsync();
+            const timeUntilExpiration = signedOrder.expirationTimeSeconds.minus(currentTimestamp).toNumber();
+            await increaseTimeAndMineBlockAsync(timeUntilExpiration);
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = takerAssetFillAmount;
+            const expectedOrderStatus = OrderStatus.EXPIRED;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for an expired and fully filled order', async () => {
+            await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress);
+            const currentTimestamp = await getLatestBlockTimestampAsync();
+            const timeUntilExpiration = signedOrder.expirationTimeSeconds.minus(currentTimestamp).toNumber();
+            await increaseTimeAndMineBlockAsync(timeUntilExpiration);
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = signedOrder.takerAssetAmount;
+            // FULLY_FILLED takes precedence over EXPIRED
+            const expectedOrderStatus = OrderStatus.FULLY_FILLED;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for an order with a makerAssetAmount of 0', async () => {
+            signedOrder = await orderFactory.newSignedOrderAsync({ makerAssetAmount: new BigNumber(0) });
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = new BigNumber(0);
+            const expectedOrderStatus = OrderStatus.INVALID_MAKER_ASSET_AMOUNT;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+        it('should return the correct orderInfo for an order with a takerAssetAmount of 0', async () => {
+            signedOrder = await orderFactory.newSignedOrderAsync({ takerAssetAmount: new BigNumber(0) });
+            const orderInfo = await exchangeWrapper.getOrderInfoAsync(signedOrder);
+            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+            const expectedTakerAssetFilledAmount = new BigNumber(0);
+            const expectedOrderStatus = OrderStatus.INVALID_TAKER_ASSET_AMOUNT;
+            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+            expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+        });
+    });
 });
 // tslint:disable:max-file-line-count
 // tslint:enable:no-unnecessary-type-assertion
diff --git a/packages/contracts/test/exchange/libs.ts b/packages/contracts/test/exchange/libs.ts
index 6ded6329c..af595fedd 100644
--- a/packages/contracts/test/exchange/libs.ts
+++ b/packages/contracts/test/exchange/libs.ts
@@ -71,7 +71,7 @@ describe('Exchange libs', () => {
         });
         describe('getOrderHash', () => {
             it('should output the correct orderHash', async () => {
-                signedOrder = orderFactory.newSignedOrder();
+                signedOrder = await orderFactory.newSignedOrderAsync();
                 const orderHashHex = await libs.publicGetOrderHash.callAsync(signedOrder);
                 expect(orderHashUtils.getOrderHashHex(signedOrder)).to.be.equal(orderHashHex);
             });
diff --git a/packages/contracts/test/exchange/match_orders.ts b/packages/contracts/test/exchange/match_orders.ts
index 16041e968..6975aa115 100644
--- a/packages/contracts/test/exchange/match_orders.ts
+++ b/packages/contracts/test/exchange/match_orders.ts
@@ -150,13 +150,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts when orders completely fill each other', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -182,13 +182,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts when orders completely fill each other and taker doesnt take a profit', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -225,13 +225,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts when left order is completely filled and right order is partially filled', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -257,13 +257,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts when right order is completely filled and left order is partially filled', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -289,13 +289,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts when consecutive calls are used to completely fill the left order', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -326,7 +326,7 @@ describe('matchOrders', () => {
             // Note: This order needs makerAssetAmount=90/takerAssetAmount=[anything <= 45] to fully fill the right order.
             //       However, we use 100/50 to ensure a partial fill as we want to go down the "left fill"
             //       branch in the contract twice for this test.
-            const signedOrderRight2 = orderFactoryRight.newSignedOrder({
+            const signedOrderRight2 = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -356,14 +356,14 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts when consecutive calls are used to completely fill the right order', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
 
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -394,7 +394,7 @@ describe('matchOrders', () => {
             // Note: This order needs makerAssetAmount=96/takerAssetAmount=48 to fully fill the right order.
             //       However, we use 100/50 to ensure a partial fill as we want to go down the "right fill"
             //       branch in the contract twice for this test.
-            const signedOrderLeft2 = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft2 = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), 18),
@@ -425,13 +425,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts if fee recipient is the same across both matched orders', async () => {
             const feeRecipientAddress = feeRecipientAddressLeft;
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -451,13 +451,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts if taker is also the left order maker', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -478,13 +478,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts if taker is also the right order maker', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -505,13 +505,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts if taker is also the left fee recipient', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -532,13 +532,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts if taker is also the right fee recipient', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -559,13 +559,13 @@ describe('matchOrders', () => {
 
         it('should transfer the correct amounts if left maker is the left fee recipient and right maker is the right fee recipient', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: makerAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -585,13 +585,13 @@ describe('matchOrders', () => {
 
         it('Should throw if left order is not fillable', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -610,13 +610,13 @@ describe('matchOrders', () => {
 
         it('Should throw if right order is not fillable', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -635,13 +635,13 @@ describe('matchOrders', () => {
 
         it('should throw if there is not a positive spread', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -658,13 +658,13 @@ describe('matchOrders', () => {
 
         it('should throw if the left maker asset is not equal to the right taker asset ', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
@@ -685,7 +685,7 @@ describe('matchOrders', () => {
 
         it('should throw if the right maker asset is not equal to the left taker asset', async () => {
             // Create orders to match
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -693,7 +693,7 @@ describe('matchOrders', () => {
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
@@ -711,7 +711,7 @@ describe('matchOrders', () => {
         it('should transfer correct amounts when left order maker asset is an ERC721 token', async () => {
             // Create orders to match
             const erc721TokenToTransfer = erc721LeftMakerAssetIds[0];
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(defaultERC721AssetAddress, erc721TokenToTransfer),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
@@ -719,7 +719,7 @@ describe('matchOrders', () => {
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC721AssetData(defaultERC721AssetAddress, erc721TokenToTransfer),
@@ -746,7 +746,7 @@ describe('matchOrders', () => {
         it('should transfer correct amounts when right order maker asset is an ERC721 token', async () => {
             // Create orders to match
             const erc721TokenToTransfer = erc721RightMakerAssetIds[0];
-            const signedOrderLeft = orderFactoryLeft.newSignedOrder({
+            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
                 makerAddress: makerAddressLeft,
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
                 takerAssetData: assetProxyUtils.encodeERC721AssetData(defaultERC721AssetAddress, erc721TokenToTransfer),
@@ -754,7 +754,7 @@ describe('matchOrders', () => {
                 takerAssetAmount: new BigNumber(1),
                 feeRecipientAddress: feeRecipientAddressLeft,
             });
-            const signedOrderRight = orderFactoryRight.newSignedOrder({
+            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
                 makerAddress: makerAddressRight,
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(defaultERC721AssetAddress, erc721TokenToTransfer),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress),
diff --git a/packages/contracts/test/exchange/signature_validator.ts b/packages/contracts/test/exchange/signature_validator.ts
index 8cd6409a5..2f4a9055d 100644
--- a/packages/contracts/test/exchange/signature_validator.ts
+++ b/packages/contracts/test/exchange/signature_validator.ts
@@ -95,7 +95,7 @@ describe('MixinSignatureValidator', () => {
 
     describe('isValidSignature', () => {
         beforeEach(async () => {
-            signedOrder = orderFactory.newSignedOrder();
+            signedOrder = await orderFactory.newSignedOrderAsync();
         });
 
         it('should revert when signature is empty', async () => {
diff --git a/packages/contracts/test/exchange/transactions.ts b/packages/contracts/test/exchange/transactions.ts
index 0d66b11b8..831576cd2 100644
--- a/packages/contracts/test/exchange/transactions.ts
+++ b/packages/contracts/test/exchange/transactions.ts
@@ -121,7 +121,7 @@ describe('Exchange transactions', () => {
             let takerAssetFillAmount: BigNumber;
             beforeEach(async () => {
                 erc20Balances = await erc20Wrapper.getBalancesAsync();
-                signedOrder = orderFactory.newSignedOrder();
+                signedOrder = await orderFactory.newSignedOrderAsync();
                 orderWithoutExchangeAddress = orderUtils.getOrderWithoutExchangeAddress(signedOrder);
 
                 takerAssetFillAmount = signedOrder.takerAssetAmount.div(2);
@@ -226,7 +226,7 @@ describe('Exchange transactions', () => {
 
             it("should cancel an order if called from the order's sender", async () => {
                 const orderSalt = new BigNumber(0);
-                signedOrder = orderFactory.newSignedOrder({
+                signedOrder = await orderFactory.newSignedOrderAsync({
                     senderAddress: exchangeWrapperContract.address,
                     salt: orderSalt,
                 });
@@ -265,7 +265,7 @@ describe('Exchange transactions', () => {
 
             it("should not cancel an order if not called from the order's sender", async () => {
                 const orderSalt = new BigNumber(0);
-                signedOrder = orderFactory.newSignedOrder({
+                signedOrder = await orderFactory.newSignedOrderAsync({
                     senderAddress: exchangeWrapperContract.address,
                     salt: orderSalt,
                 });
@@ -356,7 +356,7 @@ describe('Exchange transactions', () => {
         });
 
         beforeEach(async () => {
-            signedOrder = whitelistOrderFactory.newSignedOrder();
+            signedOrder = await whitelistOrderFactory.newSignedOrderAsync();
             erc20Balances = await erc20Wrapper.getBalancesAsync();
         });
 
diff --git a/packages/contracts/test/exchange/wrapper.ts b/packages/contracts/test/exchange/wrapper.ts
index 655d55b83..abcb8364a 100644
--- a/packages/contracts/test/exchange/wrapper.ts
+++ b/packages/contracts/test/exchange/wrapper.ts
@@ -1,5 +1,5 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { assetProxyUtils } from '@0xproject/order-utils';
+import { assetProxyUtils, orderHashUtils } from '@0xproject/order-utils';
 import { RevertReason, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
@@ -13,13 +13,14 @@ import { ERC721ProxyContract } from '../../generated_contract_wrappers/erc721_pr
 import { ExchangeContract } from '../../generated_contract_wrappers/exchange';
 import { artifacts } from '../utils/artifacts';
 import { expectTransactionFailedAsync } from '../utils/assertions';
+import { getLatestBlockTimestampAsync, increaseTimeAndMineBlockAsync } from '../utils/block_timestamp';
 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 { ERC20BalancesByOwner } from '../utils/types';
+import { ERC20BalancesByOwner, OrderStatus } from '../utils/types';
 import { provider, txDefaults, web3Wrapper } from '../utils/web3_wrapper';
 
 chaiSetup.configure();
@@ -126,7 +127,7 @@ describe('Exchange wrappers', () => {
     });
     describe('fillOrKillOrder', () => {
         it('should transfer the correct amounts', async () => {
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
@@ -170,8 +171,9 @@ describe('Exchange wrappers', () => {
         });
 
         it('should throw if a signedOrder is expired', async () => {
-            const signedOrder = orderFactory.newSignedOrder({
-                expirationTimeSeconds: new BigNumber(Math.floor((Date.now() - 10000) / 1000)),
+            const currentTimestamp = await getLatestBlockTimestampAsync();
+            const signedOrder = await orderFactory.newSignedOrderAsync({
+                expirationTimeSeconds: new BigNumber(currentTimestamp).sub(10),
             });
 
             return expectTransactionFailedAsync(
@@ -181,7 +183,7 @@ describe('Exchange wrappers', () => {
         });
 
         it('should throw if entire takerAssetFillAmount not filled', async () => {
-            const signedOrder = orderFactory.newSignedOrder();
+            const signedOrder = await orderFactory.newSignedOrderAsync();
 
             await exchangeWrapper.fillOrderAsync(signedOrder, takerAddress, {
                 takerAssetFillAmount: signedOrder.takerAssetAmount.div(2),
@@ -196,7 +198,7 @@ describe('Exchange wrappers', () => {
 
     describe('fillOrderNoThrow', () => {
         it('should transfer the correct amounts', async () => {
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
             });
@@ -245,7 +247,7 @@ describe('Exchange wrappers', () => {
         });
 
         it('should not change erc20Balances if maker erc20Balances are too low to fill order', async () => {
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
@@ -255,7 +257,7 @@ describe('Exchange wrappers', () => {
         });
 
         it('should not change erc20Balances if taker erc20Balances are too low to fill order', async () => {
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100000), 18),
             });
 
@@ -265,7 +267,7 @@ describe('Exchange wrappers', () => {
         });
 
         it('should not change erc20Balances if maker allowances are too low to fill order', async () => {
-            const signedOrder = orderFactory.newSignedOrder();
+            const signedOrder = await orderFactory.newSignedOrderAsync();
             await web3Wrapper.awaitTransactionSuccessAsync(
                 await erc20TokenA.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
                     from: makerAddress,
@@ -285,7 +287,7 @@ describe('Exchange wrappers', () => {
         });
 
         it('should not change erc20Balances if taker allowances are too low to fill order', async () => {
-            const signedOrder = orderFactory.newSignedOrder();
+            const signedOrder = await orderFactory.newSignedOrderAsync();
             await web3Wrapper.awaitTransactionSuccessAsync(
                 await erc20TokenB.approve.sendTransactionAsync(erc20Proxy.address, new BigNumber(0), {
                     from: takerAddress,
@@ -306,7 +308,7 @@ describe('Exchange wrappers', () => {
 
         it('should not change erc20Balances if makerAssetAddress is ZRX, makerAssetAmount + makerFee > maker balance', async () => {
             const makerZRXBalance = new BigNumber(erc20Balances[makerAddress][zrxToken.address]);
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: makerZRXBalance,
                 makerFee: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
@@ -318,7 +320,7 @@ describe('Exchange wrappers', () => {
 
         it('should not change erc20Balances if makerAssetAddress is ZRX, makerAssetAmount + makerFee > maker allowance', async () => {
             const makerZRXAllowance = await zrxToken.allowance.callAsync(makerAddress, erc20Proxy.address);
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(makerZRXAllowance),
                 makerFee: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
@@ -330,7 +332,7 @@ describe('Exchange wrappers', () => {
 
         it('should not change erc20Balances if takerAssetAddress is ZRX, takerAssetAmount + takerFee > taker balance', async () => {
             const takerZRXBalance = new BigNumber(erc20Balances[takerAddress][zrxToken.address]);
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 takerAssetAmount: takerZRXBalance,
                 takerFee: new BigNumber(1),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
@@ -342,7 +344,7 @@ describe('Exchange wrappers', () => {
 
         it('should not change erc20Balances if takerAssetAddress is ZRX, takerAssetAmount + takerFee > taker allowance', async () => {
             const takerZRXAllowance = await zrxToken.allowance.callAsync(takerAddress, erc20Proxy.address);
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 takerAssetAmount: new BigNumber(takerZRXAllowance),
                 takerFee: new BigNumber(1),
                 takerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
@@ -356,7 +358,7 @@ describe('Exchange wrappers', () => {
             // Construct Exchange parameters
             const makerAssetId = erc721MakerAssetId;
             const takerAssetId = erc721TakerAssetId;
-            const signedOrder = orderFactory.newSignedOrder({
+            const signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerAssetAmount: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
@@ -388,9 +390,9 @@ describe('Exchange wrappers', () => {
         let signedOrders: SignedOrder[];
         beforeEach(async () => {
             signedOrders = [
-                orderFactory.newSignedOrder(),
-                orderFactory.newSignedOrder(),
-                orderFactory.newSignedOrder(),
+                await orderFactory.newSignedOrderAsync(),
+                await orderFactory.newSignedOrderAsync(),
+                await orderFactory.newSignedOrderAsync(),
             ];
         });
 
@@ -696,11 +698,11 @@ describe('Exchange wrappers', () => {
 
             it('should throw when a signedOrder does not use the same takerAssetAddress', async () => {
                 signedOrders = [
-                    orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder({
+                    await orderFactory.newSignedOrderAsync(),
+                    await orderFactory.newSignedOrderAsync({
                         takerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                     }),
-                    orderFactory.newSignedOrder(),
+                    await orderFactory.newSignedOrderAsync(),
                 ];
 
                 return expectTransactionFailedAsync(
@@ -796,9 +798,9 @@ describe('Exchange wrappers', () => {
 
             it('should not fill a signedOrder that does not use the same takerAssetAddress', async () => {
                 signedOrders = [
-                    orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder({
+                    await orderFactory.newSignedOrderAsync(),
+                    await orderFactory.newSignedOrderAsync(),
+                    await orderFactory.newSignedOrderAsync({
                         takerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                     }),
                 ];
@@ -914,11 +916,11 @@ describe('Exchange wrappers', () => {
 
             it('should throw when a signedOrder does not use the same makerAssetAddress', async () => {
                 signedOrders = [
-                    orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder({
+                    await orderFactory.newSignedOrderAsync(),
+                    await orderFactory.newSignedOrderAsync({
                         makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                     }),
-                    orderFactory.newSignedOrder(),
+                    await orderFactory.newSignedOrderAsync(),
                 ];
 
                 return expectTransactionFailedAsync(
@@ -1012,9 +1014,9 @@ describe('Exchange wrappers', () => {
 
             it('should not fill a signedOrder that does not use the same makerAssetAddress', async () => {
                 signedOrders = [
-                    orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder(),
-                    orderFactory.newSignedOrder({
+                    await orderFactory.newSignedOrderAsync(),
+                    await orderFactory.newSignedOrderAsync(),
+                    await orderFactory.newSignedOrderAsync({
                         makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                     }),
                 ];
@@ -1069,5 +1071,189 @@ describe('Exchange wrappers', () => {
                 expect(erc20Balances).to.be.deep.equal(newBalances);
             });
         });
+
+        describe('getOrdersInfo', () => {
+            beforeEach(async () => {
+                signedOrders = [
+                    await orderFactory.newSignedOrderAsync(),
+                    await orderFactory.newSignedOrderAsync(),
+                    await orderFactory.newSignedOrderAsync(),
+                ];
+            });
+            it('should get the correct information for multiple unfilled orders', async () => {
+                const ordersInfo = await exchangeWrapper.getOrdersInfoAsync(signedOrders);
+                expect(ordersInfo.length).to.be.equal(3);
+                _.forEach(signedOrders, (signedOrder, index) => {
+                    const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+                    const expectedTakerAssetFilledAmount = new BigNumber(0);
+                    const expectedOrderStatus = OrderStatus.FILLABLE;
+                    const orderInfo = ordersInfo[index];
+                    expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+                    expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+                    expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+                });
+            });
+            it('should get the correct information for multiple partially filled orders', async () => {
+                const takerAssetFillAmounts = _.map(signedOrders, signedOrder => signedOrder.takerAssetAmount.div(2));
+                await exchangeWrapper.batchFillOrdersAsync(signedOrders, takerAddress, { takerAssetFillAmounts });
+                const ordersInfo = await exchangeWrapper.getOrdersInfoAsync(signedOrders);
+                expect(ordersInfo.length).to.be.equal(3);
+                _.forEach(signedOrders, (signedOrder, index) => {
+                    const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+                    const expectedTakerAssetFilledAmount = signedOrder.takerAssetAmount.div(2);
+                    const expectedOrderStatus = OrderStatus.FILLABLE;
+                    const orderInfo = ordersInfo[index];
+                    expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+                    expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+                    expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+                });
+            });
+            it('should get the correct information for multiple fully filled orders', async () => {
+                await exchangeWrapper.batchFillOrdersAsync(signedOrders, takerAddress);
+                const ordersInfo = await exchangeWrapper.getOrdersInfoAsync(signedOrders);
+                expect(ordersInfo.length).to.be.equal(3);
+                _.forEach(signedOrders, (signedOrder, index) => {
+                    const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+                    const expectedTakerAssetFilledAmount = signedOrder.takerAssetAmount;
+                    const expectedOrderStatus = OrderStatus.FULLY_FILLED;
+                    const orderInfo = ordersInfo[index];
+                    expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+                    expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+                    expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+                });
+            });
+            it('should get the correct information for multiple cancelled and unfilled orders', async () => {
+                await exchangeWrapper.batchCancelOrdersAsync(signedOrders, makerAddress);
+                const ordersInfo = await exchangeWrapper.getOrdersInfoAsync(signedOrders);
+                expect(ordersInfo.length).to.be.equal(3);
+                _.forEach(signedOrders, (signedOrder, index) => {
+                    const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+                    const expectedTakerAssetFilledAmount = new BigNumber(0);
+                    const expectedOrderStatus = OrderStatus.CANCELLED;
+                    const orderInfo = ordersInfo[index];
+                    expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+                    expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+                    expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+                });
+            });
+            it('should get the correct information for multiple cancelled and partially filled orders', async () => {
+                const takerAssetFillAmounts = _.map(signedOrders, signedOrder => signedOrder.takerAssetAmount.div(2));
+                await exchangeWrapper.batchFillOrdersAsync(signedOrders, takerAddress, { takerAssetFillAmounts });
+                await exchangeWrapper.batchCancelOrdersAsync(signedOrders, makerAddress);
+                const ordersInfo = await exchangeWrapper.getOrdersInfoAsync(signedOrders);
+                expect(ordersInfo.length).to.be.equal(3);
+                _.forEach(signedOrders, (signedOrder, index) => {
+                    const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+                    const expectedTakerAssetFilledAmount = signedOrder.takerAssetAmount.div(2);
+                    const expectedOrderStatus = OrderStatus.CANCELLED;
+                    const orderInfo = ordersInfo[index];
+                    expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+                    expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+                    expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+                });
+            });
+            it('should get the correct information for multiple expired and unfilled orders', async () => {
+                const currentTimestamp = await getLatestBlockTimestampAsync();
+                const timeUntilExpiration = signedOrders[0].expirationTimeSeconds.minus(currentTimestamp).toNumber();
+                await increaseTimeAndMineBlockAsync(timeUntilExpiration);
+                const ordersInfo = await exchangeWrapper.getOrdersInfoAsync(signedOrders);
+                expect(ordersInfo.length).to.be.equal(3);
+                _.forEach(signedOrders, (signedOrder, index) => {
+                    const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+                    const expectedTakerAssetFilledAmount = new BigNumber(0);
+                    const expectedOrderStatus = OrderStatus.EXPIRED;
+                    const orderInfo = ordersInfo[index];
+                    expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+                    expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+                    expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+                });
+            });
+            it('should get the correct information for multiple expired and partially filled orders', async () => {
+                const takerAssetFillAmounts = _.map(signedOrders, signedOrder => signedOrder.takerAssetAmount.div(2));
+                await exchangeWrapper.batchFillOrdersAsync(signedOrders, takerAddress, { takerAssetFillAmounts });
+                const currentTimestamp = await getLatestBlockTimestampAsync();
+                const timeUntilExpiration = signedOrders[0].expirationTimeSeconds.minus(currentTimestamp).toNumber();
+                await increaseTimeAndMineBlockAsync(timeUntilExpiration);
+                const ordersInfo = await exchangeWrapper.getOrdersInfoAsync(signedOrders);
+                expect(ordersInfo.length).to.be.equal(3);
+                _.forEach(signedOrders, (signedOrder, index) => {
+                    const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
+                    const expectedTakerAssetFilledAmount = signedOrder.takerAssetAmount.div(2);
+                    const expectedOrderStatus = OrderStatus.EXPIRED;
+                    const orderInfo = ordersInfo[index];
+                    expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
+                    expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(expectedTakerAssetFilledAmount);
+                    expect(orderInfo.orderStatus).to.equal(expectedOrderStatus);
+                });
+            });
+            it('should get the correct information for a mix of unfilled, partially filled, fully filled, cancelled, and expired orders', async () => {
+                const unfilledOrder = await orderFactory.newSignedOrderAsync();
+                const partiallyFilledOrder = await orderFactory.newSignedOrderAsync();
+                await exchangeWrapper.fillOrderAsync(partiallyFilledOrder, takerAddress, {
+                    takerAssetFillAmount: partiallyFilledOrder.takerAssetAmount.div(2),
+                });
+                const fullyFilledOrder = await orderFactory.newSignedOrderAsync();
+                await exchangeWrapper.fillOrderAsync(fullyFilledOrder, takerAddress);
+                const cancelledOrder = await orderFactory.newSignedOrderAsync();
+                await exchangeWrapper.cancelOrderAsync(cancelledOrder, makerAddress);
+                const currentTimestamp = await getLatestBlockTimestampAsync();
+                const expiredOrder = await orderFactory.newSignedOrderAsync({
+                    expirationTimeSeconds: new BigNumber(currentTimestamp),
+                });
+                signedOrders = [unfilledOrder, partiallyFilledOrder, fullyFilledOrder, cancelledOrder, expiredOrder];
+                const ordersInfo = await exchangeWrapper.getOrdersInfoAsync(signedOrders);
+                expect(ordersInfo.length).to.be.equal(5);
+
+                const expectedUnfilledOrderHash = orderHashUtils.getOrderHashHex(unfilledOrder);
+                const expectedUnfilledTakerAssetFilledAmount = new BigNumber(0);
+                const expectedUnfilledOrderStatus = OrderStatus.FILLABLE;
+                const unfilledOrderInfo = ordersInfo[0];
+                expect(unfilledOrderInfo.orderHash).to.be.equal(expectedUnfilledOrderHash);
+                expect(unfilledOrderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(
+                    expectedUnfilledTakerAssetFilledAmount,
+                );
+                expect(unfilledOrderInfo.orderStatus).to.be.equal(expectedUnfilledOrderStatus);
+
+                const expectedPartialOrderHash = orderHashUtils.getOrderHashHex(partiallyFilledOrder);
+                const expectedPartialTakerAssetFilledAmount = partiallyFilledOrder.takerAssetAmount.div(2);
+                const expectedPartialOrderStatus = OrderStatus.FILLABLE;
+                const partialOrderInfo = ordersInfo[1];
+                expect(partialOrderInfo.orderHash).to.be.equal(expectedPartialOrderHash);
+                expect(partialOrderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(
+                    expectedPartialTakerAssetFilledAmount,
+                );
+                expect(partialOrderInfo.orderStatus).to.be.equal(expectedPartialOrderStatus);
+
+                const expectedFilledOrderHash = orderHashUtils.getOrderHashHex(fullyFilledOrder);
+                const expectedFilledTakerAssetFilledAmount = fullyFilledOrder.takerAssetAmount;
+                const expectedFilledOrderStatus = OrderStatus.FULLY_FILLED;
+                const filledOrderInfo = ordersInfo[2];
+                expect(filledOrderInfo.orderHash).to.be.equal(expectedFilledOrderHash);
+                expect(filledOrderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(
+                    expectedFilledTakerAssetFilledAmount,
+                );
+                expect(filledOrderInfo.orderStatus).to.be.equal(expectedFilledOrderStatus);
+
+                const expectedCancelledOrderHash = orderHashUtils.getOrderHashHex(cancelledOrder);
+                const expectedCancelledTakerAssetFilledAmount = new BigNumber(0);
+                const expectedCancelledOrderStatus = OrderStatus.CANCELLED;
+                const cancelledOrderInfo = ordersInfo[3];
+                expect(cancelledOrderInfo.orderHash).to.be.equal(expectedCancelledOrderHash);
+                expect(cancelledOrderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(
+                    expectedCancelledTakerAssetFilledAmount,
+                );
+                expect(cancelledOrderInfo.orderStatus).to.be.equal(expectedCancelledOrderStatus);
+
+                const expectedExpiredOrderHash = orderHashUtils.getOrderHashHex(expiredOrder);
+                const expectedExpiredTakerAssetFilledAmount = new BigNumber(0);
+                const expectedExpiredOrderStatus = OrderStatus.EXPIRED;
+                const expiredOrderInfo = ordersInfo[4];
+                expect(expiredOrderInfo.orderHash).to.be.equal(expectedExpiredOrderHash);
+                expect(expiredOrderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(
+                    expectedExpiredTakerAssetFilledAmount,
+                );
+                expect(expiredOrderInfo.orderStatus).to.be.equal(expectedExpiredOrderStatus);
+            });
+        });
     });
 }); // tslint:disable-line:max-file-line-count
diff --git a/packages/contracts/test/forwarder/forwarder.ts b/packages/contracts/test/forwarder/forwarder.ts
index f0bf6ac03..4075fccad 100644
--- a/packages/contracts/test/forwarder/forwarder.ts
+++ b/packages/contracts/test/forwarder/forwarder.ts
@@ -148,14 +148,14 @@ describe(ContractName.Forwarder, () => {
         await blockchainLifecycle.startAsync();
         feeProportion = 0;
         erc20Balances = await erc20Wrapper.getBalancesAsync();
-        signedOrder = orderFactory.newSignedOrder();
+        signedOrder = await orderFactory.newSignedOrderAsync();
         signedOrders = [signedOrder];
-        feeOrder = orderFactory.newSignedOrder({
+        feeOrder = await orderFactory.newSignedOrderAsync({
             makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
             takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
         });
         feeOrders = [feeOrder];
-        orderWithFee = orderFactory.newSignedOrder({
+        orderWithFee = await orderFactory.newSignedOrderAsync({
             takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
         });
         signedOrdersWithFee = [orderWithFee];
@@ -238,7 +238,7 @@ describe(ContractName.Forwarder, () => {
             expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(new BigNumber(0));
         });
         it('should fill the order when token is ZRX with fees', async () => {
-            orderWithFee = orderFactory.newSignedOrder({
+            orderWithFee = await orderFactory.newSignedOrderAsync({
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
             });
@@ -260,7 +260,7 @@ describe(ContractName.Forwarder, () => {
             expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(new BigNumber(0));
         });
         it('should fail if sent an ETH amount too high', async () => {
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
             });
@@ -274,11 +274,11 @@ describe(ContractName.Forwarder, () => {
             );
         });
         it('should fail if fee abstraction amount is too high', async () => {
-            orderWithFee = orderFactory.newSignedOrder({
+            orderWithFee = await orderFactory.newSignedOrderAsync({
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), DECIMALS_DEFAULT),
             });
             signedOrdersWithFee = [orderWithFee];
-            feeOrder = orderFactory.newSignedOrder({
+            feeOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
             });
@@ -294,11 +294,11 @@ describe(ContractName.Forwarder, () => {
         });
         it('throws when mixed ERC721 and ERC20 assets with ERC20 first', async () => {
             const makerAssetId = erc721MakerAssetIds[0];
-            const erc721SignedOrder = orderFactory.newSignedOrder({
+            const erc721SignedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
             });
-            const erc20SignedOrder = orderFactory.newSignedOrder();
+            const erc20SignedOrder = await orderFactory.newSignedOrderAsync();
             signedOrders = [erc20SignedOrder, erc721SignedOrder];
             const fillAmountWei = erc20SignedOrder.takerAssetAmount.plus(erc721SignedOrder.takerAssetAmount);
             return expectTransactionFailedAsync(
@@ -418,7 +418,7 @@ describe(ContractName.Forwarder, () => {
             expect(takerBalanceAfter).to.be.bignumber.eq(takerBalanceBefore.plus(makerAssetAmount));
         });
         it('should buy the exact amount of assets when buying zrx with fee abstraction', async () => {
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
             });
@@ -447,7 +447,7 @@ describe(ContractName.Forwarder, () => {
             expect(takerWeiBalanceAfter).to.be.bignumber.equal(takerWeiBalanceBefore.minus(expectedCostAfterGas));
         });
         it('throws if fees are higher than 5% when buying zrx', async () => {
-            const highFeeZRXOrder = orderFactory.newSignedOrder({
+            const highFeeZRXOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                 makerAssetAmount: signedOrder.makerAssetAmount,
                 takerFee: signedOrder.makerAssetAmount.times(0.06),
@@ -470,7 +470,7 @@ describe(ContractName.Forwarder, () => {
             );
         });
         it('throws if fees are higher than 5% when buying erc20', async () => {
-            const highFeeERC20Order = orderFactory.newSignedOrder({
+            const highFeeERC20Order = await orderFactory.newSignedOrderAsync({
                 takerFee: signedOrder.makerAssetAmount.times(0.06),
             });
             signedOrdersWithFee = [highFeeERC20Order];
@@ -544,7 +544,7 @@ describe(ContractName.Forwarder, () => {
     describe('marketBuyTokensWithEth - ERC721', async () => {
         it('buys ERC721 assets', async () => {
             const makerAssetId = erc721MakerAssetIds[0];
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
             });
@@ -566,7 +566,7 @@ describe(ContractName.Forwarder, () => {
         });
         it('buys ERC721 assets with fee abstraction', async () => {
             const makerAssetId = erc721MakerAssetIds[0];
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
@@ -588,7 +588,7 @@ describe(ContractName.Forwarder, () => {
         });
         it('buys ERC721 assets with fee abstraction and pays fee to fee recipient', async () => {
             const makerAssetId = erc721MakerAssetIds[0];
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
@@ -630,12 +630,12 @@ describe(ContractName.Forwarder, () => {
         it('buys multiple ERC721 assets with fee abstraction and pays fee to fee recipient', async () => {
             const makerAssetId1 = erc721MakerAssetIds[0];
             const makerAssetId2 = erc721MakerAssetIds[1];
-            const signedOrder1 = orderFactory.newSignedOrder({
+            const signedOrder1 = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(3), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId1),
             });
-            const signedOrder2 = orderFactory.newSignedOrder({
+            const signedOrder2 = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(4), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId2),
@@ -665,20 +665,20 @@ describe(ContractName.Forwarder, () => {
             // There are two fee orders, but the first fee order is partially filled while
             // the Forwarding contract tx is in the mempool.
             const erc721MakerAssetAmount = new BigNumber(1);
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: erc721MakerAssetAmount,
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), DECIMALS_DEFAULT),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(6), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
             });
             signedOrders = [signedOrder];
-            const firstFeeOrder = orderFactory.newSignedOrder({
+            const firstFeeOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(8), DECIMALS_DEFAULT),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(0.1), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(0), DECIMALS_DEFAULT),
             });
-            const secondFeeOrder = orderFactory.newSignedOrder({
+            const secondFeeOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(8), DECIMALS_DEFAULT),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(0.12), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
@@ -729,7 +729,7 @@ describe(ContractName.Forwarder, () => {
             // There are two fee orders, but the first fee order is partially filled while
             // the Forwarding contract tx is in the mempool.
             const erc721MakerAssetAmount = new BigNumber(1);
-            signedOrder = orderFactory.newSignedOrder({
+            signedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: erc721MakerAssetAmount,
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), DECIMALS_DEFAULT),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(6), DECIMALS_DEFAULT),
@@ -737,13 +737,13 @@ describe(ContractName.Forwarder, () => {
             });
             const zrxMakerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(8), DECIMALS_DEFAULT);
             signedOrders = [signedOrder];
-            const firstFeeOrder = orderFactory.newSignedOrder({
+            const firstFeeOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: zrxMakerAssetAmount,
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(0.1), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
                 takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(0), DECIMALS_DEFAULT),
             });
-            const secondFeeOrder = orderFactory.newSignedOrder({
+            const secondFeeOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: zrxMakerAssetAmount,
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(0.12), DECIMALS_DEFAULT),
                 makerAssetData: assetProxyUtils.encodeERC20AssetData(zrxToken.address),
@@ -778,11 +778,11 @@ describe(ContractName.Forwarder, () => {
         });
         it('throws when mixed ERC721 and ERC20 assets', async () => {
             const makerAssetId = erc721MakerAssetIds[0];
-            const erc721SignedOrder = orderFactory.newSignedOrder({
+            const erc721SignedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
             });
-            const erc20SignedOrder = orderFactory.newSignedOrder();
+            const erc20SignedOrder = await orderFactory.newSignedOrderAsync();
             signedOrders = [erc721SignedOrder, erc20SignedOrder];
             const makerAssetAmount = new BigNumber(signedOrders.length);
             const fillAmountWei = erc20SignedOrder.takerAssetAmount.plus(erc721SignedOrder.takerAssetAmount);
@@ -796,11 +796,11 @@ describe(ContractName.Forwarder, () => {
         });
         it('throws when mixed ERC721 and ERC20 assets with ERC20 first', async () => {
             const makerAssetId = erc721MakerAssetIds[0];
-            const erc721SignedOrder = orderFactory.newSignedOrder({
+            const erc721SignedOrder = await orderFactory.newSignedOrderAsync({
                 makerAssetAmount: new BigNumber(1),
                 makerAssetData: assetProxyUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
             });
-            const erc20SignedOrder = orderFactory.newSignedOrder();
+            const erc20SignedOrder = await orderFactory.newSignedOrderAsync();
             signedOrders = [erc20SignedOrder, erc721SignedOrder];
             const makerAssetAmount = new BigNumber(signedOrders.length);
             const fillAmountWei = erc20SignedOrder.takerAssetAmount.plus(erc721SignedOrder.takerAssetAmount);
diff --git a/packages/contracts/test/multisig/asset_proxy_owner.ts b/packages/contracts/test/multisig/asset_proxy_owner.ts
index 6a9843153..6b98605d3 100644
--- a/packages/contracts/test/multisig/asset_proxy_owner.ts
+++ b/packages/contracts/test/multisig/asset_proxy_owner.ts
@@ -18,9 +18,9 @@ import {
     expectContractCreationFailedWithoutReason,
     expectTransactionFailedWithoutReasonAsync,
 } from '../utils/assertions';
+import { increaseTimeAndMineBlockAsync } from '../utils/block_timestamp';
 import { chaiSetup } from '../utils/chai_setup';
 import { constants } from '../utils/constants';
-import { increaseTimeAndMineBlockAsync } from '../utils/increase_time';
 import { MultiSigWrapper } from '../utils/multi_sig_wrapper';
 import { provider, txDefaults, web3Wrapper } from '../utils/web3_wrapper';
 
diff --git a/packages/contracts/test/multisig/multi_sig_with_time_lock.ts b/packages/contracts/test/multisig/multi_sig_with_time_lock.ts
index a8e9243a9..8eeeeca6b 100644
--- a/packages/contracts/test/multisig/multi_sig_with_time_lock.ts
+++ b/packages/contracts/test/multisig/multi_sig_with_time_lock.ts
@@ -9,9 +9,9 @@ import {
 } from '../../generated_contract_wrappers/multi_sig_wallet_with_time_lock';
 import { artifacts } from '../utils/artifacts';
 import { expectTransactionFailedWithoutReasonAsync } from '../utils/assertions';
+import { increaseTimeAndMineBlockAsync } from '../utils/block_timestamp';
 import { chaiSetup } from '../utils/chai_setup';
 import { constants } from '../utils/constants';
-import { increaseTimeAndMineBlockAsync } from '../utils/increase_time';
 import { MultiSigWrapper } from '../utils/multi_sig_wrapper';
 import { provider, txDefaults, web3Wrapper } from '../utils/web3_wrapper';
 
diff --git a/packages/contracts/test/utils/asset_wrapper.ts b/packages/contracts/test/utils/asset_wrapper.ts
index f291170a2..3e548d186 100644
--- a/packages/contracts/test/utils/asset_wrapper.ts
+++ b/packages/contracts/test/utils/asset_wrapper.ts
@@ -17,7 +17,7 @@ interface ProxyIdToAssetWrappers {
  * the logic that uses it does not need to care what standard a token belongs to.
  */
 export class AssetWrapper {
-    private _proxyIdToAssetWrappers: ProxyIdToAssetWrappers;
+    private readonly _proxyIdToAssetWrappers: ProxyIdToAssetWrappers;
     constructor(assetWrappers: AbstractAssetWrapper[]) {
         this._proxyIdToAssetWrappers = {};
         _.each(assetWrappers, assetWrapper => {
diff --git a/packages/contracts/test/utils/increase_time.ts b/packages/contracts/test/utils/block_timestamp.ts
index 4565d8dbc..1159792c4 100644
--- a/packages/contracts/test/utils/increase_time.ts
+++ b/packages/contracts/test/utils/block_timestamp.ts
@@ -29,3 +29,12 @@ export async function increaseTimeAndMineBlockAsync(seconds: number): Promise<nu
 
     return offset;
 }
+
+/**
+ * Returns the timestamp of the latest block in seconds since the Unix epoch.
+ * @returns a new Promise which will resolve with the timestamp in seconds.
+ */
+export async function getLatestBlockTimestampAsync(): Promise<number> {
+    const currentBlock = await web3Wrapper.getBlockAsync('latest');
+    return currentBlock.timestamp;
+}
diff --git a/packages/contracts/test/utils/erc20_wrapper.ts b/packages/contracts/test/utils/erc20_wrapper.ts
index cf1433791..e1863be36 100644
--- a/packages/contracts/test/utils/erc20_wrapper.ts
+++ b/packages/contracts/test/utils/erc20_wrapper.ts
@@ -13,11 +13,11 @@ import { ERC20BalancesByOwner } from './types';
 import { txDefaults } from './web3_wrapper';
 
 export class ERC20Wrapper {
-    private _tokenOwnerAddresses: string[];
-    private _contractOwnerAddress: string;
-    private _web3Wrapper: Web3Wrapper;
-    private _provider: Provider;
-    private _dummyTokenContracts: DummyERC20TokenContract[];
+    private readonly _tokenOwnerAddresses: string[];
+    private readonly _contractOwnerAddress: string;
+    private readonly _web3Wrapper: Web3Wrapper;
+    private readonly _provider: Provider;
+    private readonly _dummyTokenContracts: DummyERC20TokenContract[];
     private _proxyContract?: ERC20ProxyContract;
     private _proxyIdIfExists?: string;
     constructor(provider: Provider, tokenOwnerAddresses: string[], contractOwnerAddress: string) {
diff --git a/packages/contracts/test/utils/erc721_wrapper.ts b/packages/contracts/test/utils/erc721_wrapper.ts
index a38dfb811..d023b4d02 100644
--- a/packages/contracts/test/utils/erc721_wrapper.ts
+++ b/packages/contracts/test/utils/erc721_wrapper.ts
@@ -13,11 +13,11 @@ import { ERC721TokenIdsByOwner } from './types';
 import { txDefaults } from './web3_wrapper';
 
 export class ERC721Wrapper {
-    private _tokenOwnerAddresses: string[];
-    private _contractOwnerAddress: string;
-    private _web3Wrapper: Web3Wrapper;
-    private _provider: Provider;
-    private _dummyTokenContracts: DummyERC721TokenContract[];
+    private readonly _tokenOwnerAddresses: string[];
+    private readonly _contractOwnerAddress: string;
+    private readonly _web3Wrapper: Web3Wrapper;
+    private readonly _provider: Provider;
+    private readonly _dummyTokenContracts: DummyERC721TokenContract[];
     private _proxyContract?: ERC721ProxyContract;
     private _proxyIdIfExists?: string;
     private _initialTokenIdsByOwner: ERC721TokenIdsByOwner = {};
diff --git a/packages/contracts/test/utils/exchange_wrapper.ts b/packages/contracts/test/utils/exchange_wrapper.ts
index 155d0eeb0..490ea959b 100644
--- a/packages/contracts/test/utils/exchange_wrapper.ts
+++ b/packages/contracts/test/utils/exchange_wrapper.ts
@@ -11,9 +11,9 @@ import { orderUtils } from './order_utils';
 import { OrderInfo, SignedTransaction } from './types';
 
 export class ExchangeWrapper {
-    private _exchange: ExchangeContract;
-    private _web3Wrapper: Web3Wrapper;
-    private _logDecoder: LogDecoder;
+    private readonly _exchange: ExchangeContract;
+    private readonly _web3Wrapper: Web3Wrapper;
+    private readonly _logDecoder: LogDecoder;
     constructor(exchangeContract: ExchangeContract, provider: Provider) {
         this._exchange = exchangeContract;
         this._web3Wrapper = new Web3Wrapper(provider);
@@ -223,6 +223,10 @@ export class ExchangeWrapper {
         const orderInfo = (await this._exchange.getOrderInfo.callAsync(signedOrder)) as OrderInfo;
         return orderInfo;
     }
+    public async getOrdersInfoAsync(signedOrders: SignedOrder[]): Promise<OrderInfo[]> {
+        const ordersInfo = (await this._exchange.getOrdersInfo.callAsync(signedOrders)) as OrderInfo[];
+        return ordersInfo;
+    }
     public async matchOrdersAsync(
         signedOrderLeft: SignedOrder,
         signedOrderRight: SignedOrder,
diff --git a/packages/contracts/test/utils/forwarder_wrapper.ts b/packages/contracts/test/utils/forwarder_wrapper.ts
index d227420ee..0d4214402 100644
--- a/packages/contracts/test/utils/forwarder_wrapper.ts
+++ b/packages/contracts/test/utils/forwarder_wrapper.ts
@@ -18,10 +18,10 @@ const ZERO_AMOUNT = new BigNumber(0);
 const INSUFFICENT_ORDERS_FOR_MAKER_AMOUNT = 'Unable to satisfy makerAssetFillAmount with provided orders';
 
 export class ForwarderWrapper {
-    private _web3Wrapper: Web3Wrapper;
-    private _forwarderContract: ForwarderContract;
-    private _logDecoder: LogDecoder;
-    private _zrxAddress: string;
+    private readonly _web3Wrapper: Web3Wrapper;
+    private readonly _forwarderContract: ForwarderContract;
+    private readonly _logDecoder: LogDecoder;
+    private readonly _zrxAddress: string;
     private static _createOptimizedSellOrders(signedOrders: SignedOrder[]): MarketSellOrders {
         const marketSellOrders = formatters.createMarketSellOrders(signedOrders, ZERO_AMOUNT);
         const assetDataId = assetProxyUtils.decodeAssetDataId(signedOrders[0].makerAssetData);
diff --git a/packages/contracts/test/utils/log_decoder.ts b/packages/contracts/test/utils/log_decoder.ts
index 07127ba79..5a4801319 100644
--- a/packages/contracts/test/utils/log_decoder.ts
+++ b/packages/contracts/test/utils/log_decoder.ts
@@ -15,9 +15,9 @@ import { artifacts } from './artifacts';
 import { constants } from './constants';
 
 export class LogDecoder {
-    private _web3Wrapper: Web3Wrapper;
-    private _contractAddress: string;
-    private _abiDecoder: AbiDecoder;
+    private readonly _web3Wrapper: Web3Wrapper;
+    private readonly _contractAddress: string;
+    private readonly _abiDecoder: AbiDecoder;
     public static wrapLogBigNumbers(log: any): any {
         const argNames = _.keys(log.args);
         for (const argName of argNames) {
diff --git a/packages/contracts/test/utils/match_order_tester.ts b/packages/contracts/test/utils/match_order_tester.ts
index 6145779b0..0d5ad5e9f 100644
--- a/packages/contracts/test/utils/match_order_tester.ts
+++ b/packages/contracts/test/utils/match_order_tester.ts
@@ -14,10 +14,10 @@ chaiSetup.configure();
 const expect = chai.expect;
 
 export class MatchOrderTester {
-    private _exchangeWrapper: ExchangeWrapper;
-    private _erc20Wrapper: ERC20Wrapper;
-    private _erc721Wrapper: ERC721Wrapper;
-    private _feeTokenAddress: string;
+    private readonly _exchangeWrapper: ExchangeWrapper;
+    private readonly _erc20Wrapper: ERC20Wrapper;
+    private readonly _erc721Wrapper: ERC721Wrapper;
+    private readonly _feeTokenAddress: string;
 
     /// @dev Compares a pair of ERC20 balances and a pair of ERC721 token owners.
     /// @param expectedNewERC20BalancesByOwner Expected ERC20 balances.
diff --git a/packages/contracts/test/utils/multi_sig_wrapper.ts b/packages/contracts/test/utils/multi_sig_wrapper.ts
index 2024c177d..8c8055d4a 100644
--- a/packages/contracts/test/utils/multi_sig_wrapper.ts
+++ b/packages/contracts/test/utils/multi_sig_wrapper.ts
@@ -10,9 +10,9 @@ import { constants } from './constants';
 import { LogDecoder } from './log_decoder';
 
 export class MultiSigWrapper {
-    private _multiSig: MultiSigWalletContract;
-    private _web3Wrapper: Web3Wrapper;
-    private _logDecoder: LogDecoder;
+    private readonly _multiSig: MultiSigWalletContract;
+    private readonly _web3Wrapper: Web3Wrapper;
+    private readonly _logDecoder: LogDecoder;
     constructor(multiSigContract: MultiSigWalletContract, provider: Provider) {
         this._multiSig = multiSigContract;
         this._web3Wrapper = new Web3Wrapper(provider);
diff --git a/packages/contracts/test/utils/order_factory.ts b/packages/contracts/test/utils/order_factory.ts
index 009dbc396..63a893695 100644
--- a/packages/contracts/test/utils/order_factory.ts
+++ b/packages/contracts/test/utils/order_factory.ts
@@ -2,25 +2,26 @@ import { generatePseudoRandomSalt, orderHashUtils } from '@0xproject/order-utils
 import { Order, SignatureType, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 
+import { getLatestBlockTimestampAsync } from './block_timestamp';
 import { constants } from './constants';
 import { signingUtils } from './signing_utils';
 
 export class OrderFactory {
-    private _defaultOrderParams: Partial<Order>;
-    private _privateKey: Buffer;
+    private readonly _defaultOrderParams: Partial<Order>;
+    private readonly _privateKey: Buffer;
     constructor(privateKey: Buffer, defaultOrderParams: Partial<Order>) {
         this._defaultOrderParams = defaultOrderParams;
         this._privateKey = privateKey;
     }
-    public newSignedOrder(
+    public async newSignedOrderAsync(
         customOrderParams: Partial<Order> = {},
         signatureType: SignatureType = SignatureType.EthSign,
-    ): SignedOrder {
-        const tenMinutes = 10 * 60 * 1000;
-        const randomExpiration = new BigNumber(Date.now() + tenMinutes);
+    ): Promise<SignedOrder> {
+        const tenMinutesInSeconds = 10 * 60;
+        const currentBlockTimestamp = await getLatestBlockTimestampAsync();
         const order = ({
             senderAddress: constants.NULL_ADDRESS,
-            expirationTimeSeconds: randomExpiration,
+            expirationTimeSeconds: new BigNumber(currentBlockTimestamp).add(tenMinutesInSeconds),
             salt: generatePseudoRandomSalt(),
             takerAddress: constants.NULL_ADDRESS,
             ...this._defaultOrderParams,
diff --git a/packages/contracts/test/utils/order_factory_from_scenario.ts b/packages/contracts/test/utils/order_factory_from_scenario.ts
index 526505871..e0edbff26 100644
--- a/packages/contracts/test/utils/order_factory_from_scenario.ts
+++ b/packages/contracts/test/utils/order_factory_from_scenario.ts
@@ -24,13 +24,13 @@ const FIVE_UNITS_FIVE_DECIMALS = new BigNumber(500_000);
 const ONE_NFT_UNIT = new BigNumber(1);
 
 export class OrderFactoryFromScenario {
-    private _userAddresses: string[];
-    private _zrxAddress: string;
-    private _nonZrxERC20EighteenDecimalTokenAddresses: string[];
-    private _erc20FiveDecimalTokenAddresses: string[];
-    private _erc721Token: DummyERC721TokenContract;
-    private _erc721Balances: ERC721TokenIdsByOwner;
-    private _exchangeAddress: string;
+    private readonly _userAddresses: string[];
+    private readonly _zrxAddress: string;
+    private readonly _nonZrxERC20EighteenDecimalTokenAddresses: string[];
+    private readonly _erc20FiveDecimalTokenAddresses: string[];
+    private readonly _erc721Token: DummyERC721TokenContract;
+    private readonly _erc721Balances: ERC721TokenIdsByOwner;
+    private readonly _exchangeAddress: string;
     constructor(
         userAddresses: string[],
         zrxAddress: string,
diff --git a/packages/contracts/test/utils/simple_asset_balance_and_proxy_allowance_fetcher.ts b/packages/contracts/test/utils/simple_asset_balance_and_proxy_allowance_fetcher.ts
index a295a40c4..598ee6d29 100644
--- a/packages/contracts/test/utils/simple_asset_balance_and_proxy_allowance_fetcher.ts
+++ b/packages/contracts/test/utils/simple_asset_balance_and_proxy_allowance_fetcher.ts
@@ -4,7 +4,7 @@ import { BigNumber } from '@0xproject/utils';
 import { AssetWrapper } from './asset_wrapper';
 
 export class SimpleAssetBalanceAndProxyAllowanceFetcher implements AbstractBalanceAndProxyAllowanceFetcher {
-    private _assetWrapper: AssetWrapper;
+    private readonly _assetWrapper: AssetWrapper;
     constructor(assetWrapper: AssetWrapper) {
         this._assetWrapper = assetWrapper;
     }
diff --git a/packages/contracts/test/utils/simple_order_filled_cancelled_fetcher.ts b/packages/contracts/test/utils/simple_order_filled_cancelled_fetcher.ts
index 24afe36b7..ed69ecc63 100644
--- a/packages/contracts/test/utils/simple_order_filled_cancelled_fetcher.ts
+++ b/packages/contracts/test/utils/simple_order_filled_cancelled_fetcher.ts
@@ -4,8 +4,8 @@ import { BigNumber } from '@0xproject/utils';
 import { ExchangeWrapper } from './exchange_wrapper';
 
 export class SimpleOrderFilledCancelledFetcher implements AbstractOrderFilledCancelledFetcher {
-    private _exchangeWrapper: ExchangeWrapper;
-    private _zrxAssetData: string;
+    private readonly _exchangeWrapper: ExchangeWrapper;
+    private readonly _zrxAssetData: string;
     constructor(exchange: ExchangeWrapper, zrxAssetData: string) {
         this._exchangeWrapper = exchange;
         this._zrxAssetData = zrxAssetData;
diff --git a/packages/contracts/test/utils/token_registry_wrapper.ts b/packages/contracts/test/utils/token_registry_wrapper.ts
index 0abf20e03..f1c40e8ff 100644
--- a/packages/contracts/test/utils/token_registry_wrapper.ts
+++ b/packages/contracts/test/utils/token_registry_wrapper.ts
@@ -8,8 +8,8 @@ import { Token } from './types';
 import { constants } from './constants';
 
 export class TokenRegWrapper {
-    private _tokenReg: TokenRegistryContract;
-    private _web3Wrapper: Web3Wrapper;
+    private readonly _tokenReg: TokenRegistryContract;
+    private readonly _web3Wrapper: Web3Wrapper;
     constructor(tokenRegContract: TokenRegistryContract, provider: Provider) {
         this._tokenReg = tokenRegContract;
         this._web3Wrapper = new Web3Wrapper(provider);
diff --git a/packages/contracts/test/utils/transaction_factory.ts b/packages/contracts/test/utils/transaction_factory.ts
index 348c0715d..281c1e30d 100644
--- a/packages/contracts/test/utils/transaction_factory.ts
+++ b/packages/contracts/test/utils/transaction_factory.ts
@@ -15,9 +15,9 @@ const EIP712_ZEROEX_TRANSACTION_SCHEMA: EIP712Schema = {
 };
 
 export class TransactionFactory {
-    private _signerBuff: Buffer;
-    private _exchangeAddress: string;
-    private _privateKey: Buffer;
+    private readonly _signerBuff: Buffer;
+    private readonly _exchangeAddress: string;
+    private readonly _privateKey: Buffer;
     constructor(privateKey: Buffer, exchangeAddress: string) {
         this._privateKey = privateKey;
         this._exchangeAddress = exchangeAddress;
diff --git a/packages/contracts/test/utils/web3_wrapper.ts b/packages/contracts/test/utils/web3_wrapper.ts
index c9d83a02d..acb3103b7 100644
--- a/packages/contracts/test/utils/web3_wrapper.ts
+++ b/packages/contracts/test/utils/web3_wrapper.ts
@@ -51,8 +51,10 @@ export const provider = web3Factory.getRpcProvider(providerConfigs);
 const isCoverageEnabled = env.parseBoolean(EnvVars.SolidityCoverage);
 const isProfilerEnabled = env.parseBoolean(EnvVars.SolidityProfiler);
 const isRevertTraceEnabled = env.parseBoolean(EnvVars.SolidityRevertTrace);
-const enabledSubproviderCount = _.filter([isCoverageEnabled, isProfilerEnabled, isRevertTraceEnabled], _.identity)
-    .length;
+const enabledSubproviderCount = _.filter(
+    [isCoverageEnabled, isProfilerEnabled, isRevertTraceEnabled],
+    _.identity.bind(_),
+).length;
 if (enabledSubproviderCount > 1) {
     throw new Error(`Only one of coverage, profiler, or revert trace subproviders can be enabled at a time`);
 }