Ran prettier and linter

2 files changed, 314 insertions, 183 deletions

diff --git a/packages/contracts/test/utils/match_order_tester.ts b/packages/contracts/test/utils/match_order_tester.ts
index 00816e7d4..300073eb0 100644
--- a/packages/contracts/test/utils/match_order_tester.ts
+++ b/packages/contracts/test/utils/match_order_tester.ts
@@ -4,12 +4,19 @@ import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import * as _ from 'lodash';
 
+import { TransactionReceiptWithDecodedLogs } from '../../../../node_modules/ethereum-types';
+
 import { chaiSetup } from './chai_setup';
 import { ERC20Wrapper } from './erc20_wrapper';
 import { ERC721Wrapper } from './erc721_wrapper';
 import { ExchangeWrapper } from './exchange_wrapper';
-import { ERC20BalancesByOwner, ERC721TokenIdsByOwner, TransferAmountsByMatchOrders as TransferAmounts, OrderInfo, OrderStatus} from './types';
-import { TransactionReceiptWithDecodedLogs } from '../../../../node_modules/ethereum-types';
+import {
+    ERC20BalancesByOwner,
+    ERC721TokenIdsByOwner,
+    OrderInfo,
+    OrderStatus,
+    TransferAmountsByMatchOrders as TransferAmounts,
+} from './types';
 
 chaiSetup.configure();
 const expect = chai.expect;
@@ -19,110 +26,117 @@ export class MatchOrderTester {
     private readonly _erc20Wrapper: ERC20Wrapper;
     private readonly _erc721Wrapper: ERC721Wrapper;
     private readonly _feeTokenAddress: string;
-
-    private async _verifyBalancesAsync(
+    /// @dev Calculates expected transfer amounts between order makers, fee recipients, and
+    ///      the taker when two orders are matched.
+    /// @param signedOrderLeft First matched order.
+    /// @param signedOrderRight Second matched order.
+    /// @param orderTakerAssetFilledAmountLeft How much left order has been filled, prior to matching orders.
+    /// @param orderTakerAssetFilledAmountRight How much the right order has been filled, prior to matching orders.
+    /// @return TransferAmounts A struct containing the expected transfer amounts.
+    private static async _verifyLogsAsync(
         signedOrderLeft: SignedOrder,
         signedOrderRight: SignedOrder,
-        initialERC20BalancesByOwner: ERC20BalancesByOwner,
-        initialERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
-        finalERC20BalancesByOwner: ERC20BalancesByOwner,
-        finalERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
+        transactionReceipt: TransactionReceiptWithDecodedLogs,
+        takerAddress: string,
         expectedTransferAmounts: TransferAmounts,
-        takerAddress: string
-    )
-    {
-        let expectedERC20BalancesByOwner: ERC20BalancesByOwner;
-        let expectedERC721TokenIdsByOwner: ERC721TokenIdsByOwner;
-        [expectedERC20BalancesByOwner, expectedERC721TokenIdsByOwner] = this._calculateExpectedBalances(
-            signedOrderLeft,
-            signedOrderRight,
-            takerAddress,
-            initialERC20BalancesByOwner,
-            initialERC721TokenIdsByOwner,
-            expectedTransferAmounts,
-        );
-        // Verify balances of makers, taker, and fee recipients
-        await this._verifyMakerTakerAndFeeRecipientBalancesAsync(
-            signedOrderLeft,
-            signedOrderRight,
-            expectedERC20BalancesByOwner,
-            finalERC20BalancesByOwner,
-            expectedERC721TokenIdsByOwner,
-            finalERC721TokenIdsByOwner,
-            takerAddress
+    ): Promise<void> {
+        // Parse logs
+        expect(transactionReceipt.logs.length, 'Checking number of logs').to.be.equal(2);
+        // First log is for left fill
+        const leftLog = (transactionReceipt.logs[0] as any) as {
+            args: {
+                makerAddress: string;
+                takerAddress: string;
+                makerAssetFilledAmount: string;
+                takerAssetFilledAmount: string;
+                makerFeePaid: string;
+                takerFeePaid: string;
+            };
+        };
+        expect(leftLog.args.makerAddress, 'Checking logged maker address of left order').to.be.equal(
+            signedOrderLeft.makerAddress,
         );
-        // Verify balances for all known accounts
-        await this._verifyAllKnownBalancesAsync(
-            expectedERC20BalancesByOwner,
-            finalERC20BalancesByOwner,
-            expectedERC721TokenIdsByOwner,
-            finalERC721TokenIdsByOwner,
+        expect(leftLog.args.takerAddress, 'Checking logged taker address of right order').to.be.equal(takerAddress);
+        const amountBoughtByLeftMaker = new BigNumber(leftLog.args.takerAssetFilledAmount);
+        const amountSoldByLeftMaker = new BigNumber(leftLog.args.makerAssetFilledAmount);
+        const feePaidByLeftMaker = new BigNumber(leftLog.args.makerFeePaid);
+        const feePaidByTakerLeft = new BigNumber(leftLog.args.takerFeePaid);
+        // Second log is for right fill
+        const rightLog = (transactionReceipt.logs[1] as any) as {
+            args: {
+                makerAddress: string;
+                takerAddress: string;
+                makerAssetFilledAmount: string;
+                takerAssetFilledAmount: string;
+                makerFeePaid: string;
+                takerFeePaid: string;
+            };
+        };
+        expect(rightLog.args.makerAddress, 'Checking logged maker address of right order').to.be.equal(
+            signedOrderRight.makerAddress,
         );
+        expect(rightLog.args.takerAddress, 'Checking loggerd taker address of right order').to.be.equal(takerAddress);
+        const amountBoughtByRightMaker = new BigNumber(rightLog.args.takerAssetFilledAmount);
+        const amountSoldByRightMaker = new BigNumber(rightLog.args.makerAssetFilledAmount);
+        const feePaidByRightMaker = new BigNumber(rightLog.args.makerFeePaid);
+        const feePaidByTakerRight = new BigNumber(rightLog.args.takerFeePaid);
+        // Derive amount received by taker
+        const amountReceivedByTaker = amountSoldByLeftMaker.sub(amountBoughtByRightMaker);
+        // Verify log values - left order
+        expect(
+            expectedTransferAmounts.amountBoughtByLeftMaker,
+            'Checking logged amount bought by left maker',
+        ).to.be.bignumber.equal(amountBoughtByLeftMaker);
+        expect(
+            expectedTransferAmounts.amountSoldByLeftMaker,
+            'Checking logged amount sold by left maker',
+        ).to.be.bignumber.equal(amountSoldByLeftMaker);
+        expect(
+            expectedTransferAmounts.feePaidByLeftMaker,
+            'Checking logged fee paid by left maker',
+        ).to.be.bignumber.equal(feePaidByLeftMaker);
+        expect(
+            expectedTransferAmounts.feePaidByTakerLeft,
+            'Checking logged fee paid on left order by taker',
+        ).to.be.bignumber.equal(feePaidByTakerLeft);
+        // Verify log values - right order
+        expect(
+            expectedTransferAmounts.amountBoughtByRightMaker,
+            'Checking logged amount bought by right maker',
+        ).to.be.bignumber.equal(amountBoughtByRightMaker);
+        expect(
+            expectedTransferAmounts.amountSoldByRightMaker,
+            'Checking logged amount sold by right maker',
+        ).to.be.bignumber.equal(amountSoldByRightMaker);
+        expect(
+            expectedTransferAmounts.feePaidByRightMaker,
+            'Checking logged fee paid by right maker',
+        ).to.be.bignumber.equal(feePaidByRightMaker);
+        expect(
+            expectedTransferAmounts.feePaidByTakerRight,
+            'Checking logged fee paid on right order by taker',
+        ).to.be.bignumber.equal(feePaidByTakerRight);
+        // Verify derived amount received by taker
+        expect(
+            expectedTransferAmounts.amountReceivedByTaker,
+            'Checking logged amount received by taker',
+        ).to.be.bignumber.equal(amountReceivedByTaker);
     }
-
-    private async _verifyMakerTakerAndFeeRecipientBalancesAsync(
-        signedOrderLeft: SignedOrder,
-        signedOrderRight: SignedOrder,
-        expectedERC20BalancesByOwner: ERC20BalancesByOwner,
-        realERC20BalancesByOwner: ERC20BalancesByOwner,
-        expectedERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
-        realERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
-        takerAddress: string
-    ) {
-        // Individual balance comparisons
-        const makerAssetProxyIdLeft = assetDataUtils.decodeAssetProxyId(signedOrderLeft.makerAssetData);
-        const makerERC20AssetDataLeft = makerAssetProxyIdLeft == AssetProxyId.ERC20 ? assetDataUtils.decodeERC20AssetData(signedOrderLeft.makerAssetData) : assetDataUtils.decodeERC721AssetData(signedOrderLeft.makerAssetData);
-        const makerAssetAddressLeft = makerERC20AssetDataLeft.tokenAddress;
-        const makerAssetProxyIdRight = assetDataUtils.decodeAssetProxyId(signedOrderRight.makerAssetData);
-        const makerERC20AssetDataRight = makerAssetProxyIdRight == AssetProxyId.ERC20 ? assetDataUtils.decodeERC20AssetData(signedOrderRight.makerAssetData) : assetDataUtils.decodeERC721AssetData(signedOrderRight.makerAssetData);
-        const makerAssetAddressRight = makerERC20AssetDataRight.tokenAddress;
-       // describe('asdad', () => {
-        if(makerAssetProxyIdLeft == AssetProxyId.ERC20) {
-            expect(realERC20BalancesByOwner[signedOrderLeft.makerAddress][makerAssetAddressLeft], "Checking left maker egress ERC20 account balance").to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderLeft.makerAddress][makerAssetAddressLeft]);
-            expect(realERC20BalancesByOwner[signedOrderRight.makerAddress][makerAssetAddressLeft], "Checking right maker ingress ERC20 account balance").to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderRight.makerAddress][makerAssetAddressLeft]);
-            expect(realERC20BalancesByOwner[takerAddress][makerAssetAddressLeft], "Checking taker ingress ERC20 account balance").to.be.bignumber.equal(expectedERC20BalancesByOwner[takerAddress][makerAssetAddressLeft]);
-        } else if(makerAssetProxyIdLeft == AssetProxyId.ERC721) {
-            expect(realERC721TokenIdsByOwner[signedOrderLeft.makerAddress][makerAssetAddressLeft].sort(), "Checking left maker egress ERC721 account holdings").to.be.deep.equal(expectedERC721TokenIdsByOwner[signedOrderLeft.makerAddress][makerAssetAddressLeft].sort());
-            expect(realERC721TokenIdsByOwner[signedOrderRight.makerAddress][makerAssetAddressLeft].sort(), "Checking right maker ERC721 account holdings").to.be.deep.equal(expectedERC721TokenIdsByOwner[signedOrderRight.makerAddress][makerAssetAddressLeft].sort());
-            expect(realERC721TokenIdsByOwner[takerAddress][makerAssetAddressLeft].sort(), "Checking taker ingress ERC721 account holdings").to.be.deep.equal(expectedERC721TokenIdsByOwner[takerAddress][makerAssetAddressLeft].sort());
-        } else {
-            throw new Error(`Unhandled Asset Proxy ID: ${makerAssetProxyIdLeft}`);
-        }
-        if(makerAssetProxyIdRight == AssetProxyId.ERC20) {
-            expect(realERC20BalancesByOwner[signedOrderLeft.makerAddress][makerAssetAddressRight], "Checking left maker ingress ERC20 account balance").to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderLeft.makerAddress][makerAssetAddressRight]);
-            expect(realERC20BalancesByOwner[signedOrderRight.makerAddress][makerAssetAddressRight], "Checking right maker egress ERC20 account balance").to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderRight.makerAddress][makerAssetAddressRight]);
-        } else if(makerAssetProxyIdRight == AssetProxyId.ERC721) {
-            expect(realERC721TokenIdsByOwner[signedOrderLeft.makerAddress][makerAssetAddressRight].sort(), "Checking left maker ingress ERC721 account holdings").to.be.deep.equal(expectedERC721TokenIdsByOwner[signedOrderLeft.makerAddress][makerAssetAddressRight].sort());
-            expect(realERC721TokenIdsByOwner[signedOrderRight.makerAddress][makerAssetAddressRight], "Checking right maker agress ERC721 account holdings").to.be.deep.equal(expectedERC721TokenIdsByOwner[signedOrderRight.makerAddress][makerAssetAddressRight]);
-        } else {
-            throw new Error(`Unhandled Asset Proxy ID: ${makerAssetProxyIdRight}`);
-        }
-        // Paid fees
-        expect(realERC20BalancesByOwner[signedOrderLeft.makerAddress][this._feeTokenAddress], "Checking left maker egress ERC20 account fees").to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderLeft.makerAddress][this._feeTokenAddress]);
-        expect(realERC20BalancesByOwner[signedOrderRight.makerAddress][this._feeTokenAddress], "Checking right maker egress ERC20 account fees").to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderRight.makerAddress][this._feeTokenAddress]);
-        expect(realERC20BalancesByOwner[takerAddress][this._feeTokenAddress], "Checking taker egress ERC20 account fees").to.be.bignumber.equal(expectedERC20BalancesByOwner[takerAddress][this._feeTokenAddress]);
-        // Received fees
-        expect(realERC20BalancesByOwner[signedOrderLeft.feeRecipientAddress][this._feeTokenAddress], "Checking left fee recipient ingress ERC20 account fees").to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderLeft.feeRecipientAddress][this._feeTokenAddress]);
-        expect(realERC20BalancesByOwner[signedOrderRight.feeRecipientAddress][this._feeTokenAddress], "Checking right fee receipient ingress ERC20 account fees").to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderRight.feeRecipientAddress][this._feeTokenAddress]);
-    }
-
     /// @dev Compares a pair of ERC20 balances and a pair of ERC721 token owners.
     /// @param expectedNewERC20BalancesByOwner Expected ERC20 balances.
     /// @param realERC20BalancesByOwner Actual ERC20 balances.
     /// @param expectedNewERC721TokenIdsByOwner Expected ERC721 token owners.
     /// @param realERC721TokenIdsByOwner Actual ERC20 token owners.
     /// @return True only if ERC20 balances match and ERC721 token owners match.
-    private async _verifyAllKnownBalancesAsync(
+    private static async _verifyAllKnownBalancesAsync(
         expectedNewERC20BalancesByOwner: ERC20BalancesByOwner,
         realERC20BalancesByOwner: ERC20BalancesByOwner,
         expectedNewERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
         realERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
-    ) {
-        
+    ): Promise<void> {
         // ERC20 Balances
-        const erc20BalancesMatch = _.isEqual(expectedNewERC20BalancesByOwner, realERC20BalancesByOwner);
-        expect(erc20BalancesMatch, "Checking all known ERC20 account balances").to.be.true();
-
+        const areERC20BalancesEqual = _.isEqual(expectedNewERC20BalancesByOwner, realERC20BalancesByOwner);
+        expect(areERC20BalancesEqual, 'Checking all known ERC20 account balances').to.be.true();
         // ERC721 Token Ids
         const sortedExpectedNewERC721TokenIdsByOwner = _.mapValues(
             expectedNewERC721TokenIdsByOwner,
@@ -137,38 +151,12 @@ export class MatchOrderTester {
                 _.sortBy(tokenIds);
             });
         });
-        const erc721TokenIdsMatch = _.isEqual(
+        const areERC721TokenIdsEqual = _.isEqual(
             sortedExpectedNewERC721TokenIdsByOwner,
             sortedNewERC721TokenIdsByOwner,
         );
-        expect(erc721TokenIdsMatch, "Checking all known ERC721 account balances").to.be.true();
+        expect(areERC721TokenIdsEqual, 'Checking all known ERC721 account balances').to.be.true();
     }
-
-    private async _verifyInitialOrderStates(
-        signedOrderLeft: SignedOrder,
-        signedOrderRight: SignedOrder,
-        initialTakerAssetFilledAmountLeft?: BigNumber,
-        initialTakerAssetFilledAmountRight?: BigNumber,
-    ): Promise<[BigNumber, BigNumber]> {
-         // Verify Left order preconditions
-         const orderTakerAssetFilledAmountLeft = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderHashUtils.getOrderHashHex(signedOrderLeft),
-        );
-        const expectedOrderFilledAmountLeft = initialTakerAssetFilledAmountLeft
-            ? initialTakerAssetFilledAmountLeft
-            : new BigNumber(0);
-        expect(expectedOrderFilledAmountLeft).to.be.bignumber.equal(orderTakerAssetFilledAmountLeft);
-        // Verify Right order preconditions
-        const orderTakerAssetFilledAmountRight = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderHashUtils.getOrderHashHex(signedOrderRight),
-        );
-        const expectedOrderFilledAmountRight = initialTakerAssetFilledAmountRight
-            ? initialTakerAssetFilledAmountRight
-            : new BigNumber(0);
-        expect(expectedOrderFilledAmountRight).to.be.bignumber.equal(orderTakerAssetFilledAmountRight);
-        return [orderTakerAssetFilledAmountLeft, orderTakerAssetFilledAmountRight];
-    }
-
     /// @dev Constructs new MatchOrderTester.
     /// @param exchangeWrapper Used to call to the Exchange.
     /// @param erc20Wrapper Used to fetch ERC20 balances.
@@ -208,23 +196,27 @@ export class MatchOrderTester {
         // Verify initial order states
         let orderTakerAssetFilledAmountLeft: BigNumber;
         let orderTakerAssetFilledAmountRight: BigNumber;
-        [orderTakerAssetFilledAmountLeft, orderTakerAssetFilledAmountRight] = await this._verifyInitialOrderStates(
+        [orderTakerAssetFilledAmountLeft, orderTakerAssetFilledAmountRight] = await this._verifyInitialOrderStatesAsync(
             signedOrderLeft,
             signedOrderRight,
             initialTakerAssetFilledAmountLeft,
-            initialTakerAssetFilledAmountRight
+            initialTakerAssetFilledAmountRight,
         );
         // Match left & right orders
-        const transactionReceipt = await this._exchangeWrapper.matchOrdersAsync(signedOrderLeft, signedOrderRight, takerAddress);
+        const transactionReceipt = await this._exchangeWrapper.matchOrdersAsync(
+            signedOrderLeft,
+            signedOrderRight,
+            takerAddress,
+        );
         const newERC20BalancesByOwner = await this._erc20Wrapper.getBalancesAsync();
         const newERC721TokenIdsByOwner = await this._erc721Wrapper.getBalancesAsync();
         // Verify logs
-        await this._verifyLogsAsync(
+        await MatchOrderTester._verifyLogsAsync(
             signedOrderLeft,
             signedOrderRight,
             transactionReceipt,
             takerAddress,
-            expectedTransferAmounts
+            expectedTransferAmounts,
         );
         // Verify exchange state
         await this._verifyExchangeStateAsync(
@@ -234,7 +226,7 @@ export class MatchOrderTester {
             orderTakerAssetFilledAmountRight,
             expectedTransferAmounts,
             initialTakerAssetFilledAmountLeft,
-            initialTakerAssetFilledAmountRight
+            initialTakerAssetFilledAmountRight,
         );
         // Verify balances of makers, taker, and fee recipients
         await this._verifyBalancesAsync(
@@ -245,57 +237,35 @@ export class MatchOrderTester {
             newERC20BalancesByOwner,
             newERC721TokenIdsByOwner,
             expectedTransferAmounts,
-            takerAddress
+            takerAddress,
         );
         return [newERC20BalancesByOwner, newERC721TokenIdsByOwner];
     }
-    /// @dev Calculates expected transfer amounts between order makers, fee recipients, and
-    ///      the taker when two orders are matched.
-    /// @param signedOrderLeft First matched order.
-    /// @param signedOrderRight Second matched order.
-    /// @param orderTakerAssetFilledAmountLeft How much left order has been filled, prior to matching orders.
-    /// @param orderTakerAssetFilledAmountRight How much the right order has been filled, prior to matching orders.
-    /// @return TransferAmounts A struct containing the expected transfer amounts.
-    private async _verifyLogsAsync(
+    private async _verifyInitialOrderStatesAsync(
         signedOrderLeft: SignedOrder,
         signedOrderRight: SignedOrder,
-        transactionReceipt: TransactionReceiptWithDecodedLogs,
-        takerAddress: string,
-        expectedTransferAmounts: TransferAmounts
-    ) {
-        // Parse logs
-        expect(transactionReceipt.logs.length, "Checking number of logs").to.be.equal(2);
-        // First log is for left fill
-        const leftLog = ((transactionReceipt.logs[0] as any) as {args: { makerAddress: string, takerAddress: string, makerAssetFilledAmount: string, takerAssetFilledAmount: string, makerFeePaid: string, takerFeePaid: string}});
-        expect(leftLog.args.makerAddress, "Checking logged maker address of left order").to.be.equal(signedOrderLeft.makerAddress);
-        expect(leftLog.args.takerAddress, "Checking logged taker address of right order").to.be.equal(takerAddress);
-        const amountBoughtByLeftMaker = new BigNumber(leftLog.args.takerAssetFilledAmount);
-        const amountSoldByLeftMaker = new BigNumber(leftLog.args.makerAssetFilledAmount);
-        const feePaidByLeftMaker = new BigNumber(leftLog.args.makerFeePaid);
-        const feePaidByTakerLeft = new BigNumber(leftLog.args.takerFeePaid);
-        // Second log is for right fill
-        const rightLog = ((transactionReceipt.logs[1] as any) as {args: { makerAddress: string, takerAddress: string, makerAssetFilledAmount: string, takerAssetFilledAmount: string, makerFeePaid: string, takerFeePaid: string}});
-        expect(rightLog.args.makerAddress, "Checking logged maker address of right order").to.be.equal(signedOrderRight.makerAddress);
-        expect(rightLog.args.takerAddress, "Checking loggerd taker address of right order").to.be.equal(takerAddress);
-        const amountBoughtByRightMaker = new BigNumber(rightLog.args.takerAssetFilledAmount);
-        const amountSoldByRightMaker = new BigNumber(rightLog.args.makerAssetFilledAmount);
-        const feePaidByRightMaker = new BigNumber(rightLog.args.makerFeePaid);
-        const feePaidByTakerRight = new BigNumber(rightLog.args.takerFeePaid);
-        // Derive amount received by taker
-        const amountReceivedByTaker = amountSoldByLeftMaker.sub(amountBoughtByRightMaker);
-        // Verify log values - left order
-        expect(expectedTransferAmounts.amountBoughtByLeftMaker, "Checking logged amount bought by left maker").to.be.bignumber.equal(amountBoughtByLeftMaker);
-        expect(expectedTransferAmounts.amountSoldByLeftMaker, "Checking logged amount sold by left maker").to.be.bignumber.equal(amountSoldByLeftMaker);
-        expect(expectedTransferAmounts.feePaidByLeftMaker, "Checking logged fee paid by left maker").to.be.bignumber.equal(feePaidByLeftMaker);
-        expect(expectedTransferAmounts.feePaidByTakerLeft, "Checking logged fee paid on left order by taker").to.be.bignumber.equal(feePaidByTakerLeft);
-        // Verify log values - right order
-        expect(expectedTransferAmounts.amountBoughtByRightMaker, "Checking logged amount bought by right maker").to.be.bignumber.equal(amountBoughtByRightMaker);
-        expect(expectedTransferAmounts.amountSoldByRightMaker, "Checking logged amount sold by right maker").to.be.bignumber.equal(amountSoldByRightMaker);
-        expect(expectedTransferAmounts.feePaidByRightMaker, "Checking logged fee paid by right maker").to.be.bignumber.equal(feePaidByRightMaker);
-        expect(expectedTransferAmounts.feePaidByTakerRight, "Checking logged fee paid on right order by taker").to.be.bignumber.equal(feePaidByTakerRight);
-        // Verify derived amount received by taker
-        expect(expectedTransferAmounts.amountReceivedByTaker, "Checking logged amount received by taker").to.be.bignumber.equal(amountReceivedByTaker);
+        initialTakerAssetFilledAmountLeft?: BigNumber,
+        initialTakerAssetFilledAmountRight?: BigNumber,
+    ): Promise<[BigNumber, BigNumber]> {
+        // Verify Left order preconditions
+        const orderTakerAssetFilledAmountLeft = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
+            orderHashUtils.getOrderHashHex(signedOrderLeft),
+        );
+        const expectedOrderFilledAmountLeft = initialTakerAssetFilledAmountLeft
+            ? initialTakerAssetFilledAmountLeft
+            : new BigNumber(0);
+        expect(expectedOrderFilledAmountLeft).to.be.bignumber.equal(orderTakerAssetFilledAmountLeft);
+        // Verify Right order preconditions
+        const orderTakerAssetFilledAmountRight = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
+            orderHashUtils.getOrderHashHex(signedOrderRight),
+        );
+        const expectedOrderFilledAmountRight = initialTakerAssetFilledAmountRight
+            ? initialTakerAssetFilledAmountRight
+            : new BigNumber(0);
+        expect(expectedOrderFilledAmountRight).to.be.bignumber.equal(orderTakerAssetFilledAmountRight);
+        return [orderTakerAssetFilledAmountLeft, orderTakerAssetFilledAmountRight];
     }
+
     /// @dev Calculates expected transfer amounts between order makers, fee recipients, and
     ///      the taker when two orders are matched.
     /// @param signedOrderLeft First matched order.
@@ -310,34 +280,193 @@ export class MatchOrderTester {
         orderTakerAssetFilledAmountRight: BigNumber,
         expectedTransferAmounts: TransferAmounts,
         initialTakerAssetFilledAmountLeft?: BigNumber,
-        initialTakerAssetFilledAmountRight?: BigNumber
-    ) {
+        initialTakerAssetFilledAmountRight?: BigNumber,
+    ): Promise<void> {
         // Verify state for left order: amount bought by left maker
         let amountBoughtByLeftMaker = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
             orderHashUtils.getOrderHashHex(signedOrderLeft),
         );
         amountBoughtByLeftMaker = amountBoughtByLeftMaker.minus(orderTakerAssetFilledAmountLeft);
-        expect(expectedTransferAmounts.amountBoughtByLeftMaker, "Checking exchange state for left order").to.be.bignumber.equal(amountBoughtByLeftMaker);
+        expect(
+            expectedTransferAmounts.amountBoughtByLeftMaker,
+            'Checking exchange state for left order',
+        ).to.be.bignumber.equal(amountBoughtByLeftMaker);
         // Verify state for right order: amount bought by right maker
         let amountBoughtByRightMaker = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
             orderHashUtils.getOrderHashHex(signedOrderRight),
         );
         amountBoughtByRightMaker = amountBoughtByRightMaker.minus(orderTakerAssetFilledAmountRight);
-        expect(expectedTransferAmounts.amountBoughtByRightMaker, "Checking exchange state for right order").to.be.bignumber.equal(amountBoughtByRightMaker);
+        expect(
+            expectedTransferAmounts.amountBoughtByRightMaker,
+            'Checking exchange state for right order',
+        ).to.be.bignumber.equal(amountBoughtByRightMaker);
         // Verify left order status
         const maxAmountBoughtByLeftMaker = initialTakerAssetFilledAmountLeft
             ? signedOrderLeft.takerAssetAmount.sub(initialTakerAssetFilledAmountLeft)
             : signedOrderLeft.takerAssetAmount;
         const leftOrderInfo: OrderInfo = await this._exchangeWrapper.getOrderInfoAsync(signedOrderLeft);
-        const leftExpectedStatus = (expectedTransferAmounts.amountBoughtByLeftMaker.equals(maxAmountBoughtByLeftMaker)) ? OrderStatus.FULLY_FILLED : OrderStatus.FILLABLE;
-        expect(leftOrderInfo.orderStatus as OrderStatus, "Checking exchange status for left order").to.be.equal(leftExpectedStatus);
+        const leftExpectedStatus = expectedTransferAmounts.amountBoughtByLeftMaker.equals(maxAmountBoughtByLeftMaker)
+            ? OrderStatus.FULLY_FILLED
+            : OrderStatus.FILLABLE;
+        expect(leftOrderInfo.orderStatus as OrderStatus, 'Checking exchange status for left order').to.be.equal(
+            leftExpectedStatus,
+        );
         // Verify right order status
         const maxAmountBoughtByRightMaker = initialTakerAssetFilledAmountRight
             ? signedOrderRight.takerAssetAmount.sub(initialTakerAssetFilledAmountRight)
             : signedOrderRight.takerAssetAmount;
         const rightOrderInfo: OrderInfo = await this._exchangeWrapper.getOrderInfoAsync(signedOrderRight);
-        const rightExpectedStatus = (expectedTransferAmounts.amountBoughtByRightMaker.equals(maxAmountBoughtByRightMaker)) ? OrderStatus.FULLY_FILLED : OrderStatus.FILLABLE;
-        expect(rightOrderInfo.orderStatus as OrderStatus, "Checking exchange status for right order").to.be.equal(rightExpectedStatus);
+        const rightExpectedStatus = expectedTransferAmounts.amountBoughtByRightMaker.equals(maxAmountBoughtByRightMaker)
+            ? OrderStatus.FULLY_FILLED
+            : OrderStatus.FILLABLE;
+        expect(rightOrderInfo.orderStatus as OrderStatus, 'Checking exchange status for right order').to.be.equal(
+            rightExpectedStatus,
+        );
+    }
+    private async _verifyBalancesAsync(
+        signedOrderLeft: SignedOrder,
+        signedOrderRight: SignedOrder,
+        initialERC20BalancesByOwner: ERC20BalancesByOwner,
+        initialERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
+        finalERC20BalancesByOwner: ERC20BalancesByOwner,
+        finalERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
+        expectedTransferAmounts: TransferAmounts,
+        takerAddress: string,
+    ): Promise<void> {
+        let expectedERC20BalancesByOwner: ERC20BalancesByOwner;
+        let expectedERC721TokenIdsByOwner: ERC721TokenIdsByOwner;
+        [expectedERC20BalancesByOwner, expectedERC721TokenIdsByOwner] = this._calculateExpectedBalances(
+            signedOrderLeft,
+            signedOrderRight,
+            takerAddress,
+            initialERC20BalancesByOwner,
+            initialERC721TokenIdsByOwner,
+            expectedTransferAmounts,
+        );
+        // Verify balances of makers, taker, and fee recipients
+        await this._verifyMakerTakerAndFeeRecipientBalancesAsync(
+            signedOrderLeft,
+            signedOrderRight,
+            expectedERC20BalancesByOwner,
+            finalERC20BalancesByOwner,
+            expectedERC721TokenIdsByOwner,
+            finalERC721TokenIdsByOwner,
+            takerAddress,
+        );
+        // Verify balances for all known accounts
+        await MatchOrderTester._verifyAllKnownBalancesAsync(
+            expectedERC20BalancesByOwner,
+            finalERC20BalancesByOwner,
+            expectedERC721TokenIdsByOwner,
+            finalERC721TokenIdsByOwner,
+        );
+    }
+    private async _verifyMakerTakerAndFeeRecipientBalancesAsync(
+        signedOrderLeft: SignedOrder,
+        signedOrderRight: SignedOrder,
+        expectedERC20BalancesByOwner: ERC20BalancesByOwner,
+        realERC20BalancesByOwner: ERC20BalancesByOwner,
+        expectedERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
+        realERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
+        takerAddress: string,
+    ): Promise<void> {
+        // Individual balance comparisons
+        const makerAssetProxyIdLeft = assetDataUtils.decodeAssetProxyId(signedOrderLeft.makerAssetData);
+        const makerERC20AssetDataLeft =
+            makerAssetProxyIdLeft === AssetProxyId.ERC20
+                ? assetDataUtils.decodeERC20AssetData(signedOrderLeft.makerAssetData)
+                : assetDataUtils.decodeERC721AssetData(signedOrderLeft.makerAssetData);
+        const makerAssetAddressLeft = makerERC20AssetDataLeft.tokenAddress;
+        const makerAssetProxyIdRight = assetDataUtils.decodeAssetProxyId(signedOrderRight.makerAssetData);
+        const makerERC20AssetDataRight =
+            makerAssetProxyIdRight === AssetProxyId.ERC20
+                ? assetDataUtils.decodeERC20AssetData(signedOrderRight.makerAssetData)
+                : assetDataUtils.decodeERC721AssetData(signedOrderRight.makerAssetData);
+        const makerAssetAddressRight = makerERC20AssetDataRight.tokenAddress;
+        if (makerAssetProxyIdLeft === AssetProxyId.ERC20) {
+            expect(
+                realERC20BalancesByOwner[signedOrderLeft.makerAddress][makerAssetAddressLeft],
+                'Checking left maker egress ERC20 account balance',
+            ).to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderLeft.makerAddress][makerAssetAddressLeft]);
+            expect(
+                realERC20BalancesByOwner[signedOrderRight.makerAddress][makerAssetAddressLeft],
+                'Checking right maker ingress ERC20 account balance',
+            ).to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderRight.makerAddress][makerAssetAddressLeft]);
+            expect(
+                realERC20BalancesByOwner[takerAddress][makerAssetAddressLeft],
+                'Checking taker ingress ERC20 account balance',
+            ).to.be.bignumber.equal(expectedERC20BalancesByOwner[takerAddress][makerAssetAddressLeft]);
+        } else if (makerAssetProxyIdLeft === AssetProxyId.ERC721) {
+            expect(
+                realERC721TokenIdsByOwner[signedOrderLeft.makerAddress][makerAssetAddressLeft].sort(),
+                'Checking left maker egress ERC721 account holdings',
+            ).to.be.deep.equal(
+                expectedERC721TokenIdsByOwner[signedOrderLeft.makerAddress][makerAssetAddressLeft].sort(),
+            );
+            expect(
+                realERC721TokenIdsByOwner[signedOrderRight.makerAddress][makerAssetAddressLeft].sort(),
+                'Checking right maker ERC721 account holdings',
+            ).to.be.deep.equal(
+                expectedERC721TokenIdsByOwner[signedOrderRight.makerAddress][makerAssetAddressLeft].sort(),
+            );
+            expect(
+                realERC721TokenIdsByOwner[takerAddress][makerAssetAddressLeft].sort(),
+                'Checking taker ingress ERC721 account holdings',
+            ).to.be.deep.equal(expectedERC721TokenIdsByOwner[takerAddress][makerAssetAddressLeft].sort());
+        } else {
+            throw new Error(`Unhandled Asset Proxy ID: ${makerAssetProxyIdLeft}`);
+        }
+        if (makerAssetProxyIdRight === AssetProxyId.ERC20) {
+            expect(
+                realERC20BalancesByOwner[signedOrderLeft.makerAddress][makerAssetAddressRight],
+                'Checking left maker ingress ERC20 account balance',
+            ).to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderLeft.makerAddress][makerAssetAddressRight]);
+            expect(
+                realERC20BalancesByOwner[signedOrderRight.makerAddress][makerAssetAddressRight],
+                'Checking right maker egress ERC20 account balance',
+            ).to.be.bignumber.equal(
+                expectedERC20BalancesByOwner[signedOrderRight.makerAddress][makerAssetAddressRight],
+            );
+        } else if (makerAssetProxyIdRight === AssetProxyId.ERC721) {
+            expect(
+                realERC721TokenIdsByOwner[signedOrderLeft.makerAddress][makerAssetAddressRight].sort(),
+                'Checking left maker ingress ERC721 account holdings',
+            ).to.be.deep.equal(
+                expectedERC721TokenIdsByOwner[signedOrderLeft.makerAddress][makerAssetAddressRight].sort(),
+            );
+            expect(
+                realERC721TokenIdsByOwner[signedOrderRight.makerAddress][makerAssetAddressRight],
+                'Checking right maker agress ERC721 account holdings',
+            ).to.be.deep.equal(expectedERC721TokenIdsByOwner[signedOrderRight.makerAddress][makerAssetAddressRight]);
+        } else {
+            throw new Error(`Unhandled Asset Proxy ID: ${makerAssetProxyIdRight}`);
+        }
+        // Paid fees
+        expect(
+            realERC20BalancesByOwner[signedOrderLeft.makerAddress][this._feeTokenAddress],
+            'Checking left maker egress ERC20 account fees',
+        ).to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderLeft.makerAddress][this._feeTokenAddress]);
+        expect(
+            realERC20BalancesByOwner[signedOrderRight.makerAddress][this._feeTokenAddress],
+            'Checking right maker egress ERC20 account fees',
+        ).to.be.bignumber.equal(expectedERC20BalancesByOwner[signedOrderRight.makerAddress][this._feeTokenAddress]);
+        expect(
+            realERC20BalancesByOwner[takerAddress][this._feeTokenAddress],
+            'Checking taker egress ERC20 account fees',
+        ).to.be.bignumber.equal(expectedERC20BalancesByOwner[takerAddress][this._feeTokenAddress]);
+        // Received fees
+        expect(
+            realERC20BalancesByOwner[signedOrderLeft.feeRecipientAddress][this._feeTokenAddress],
+            'Checking left fee recipient ingress ERC20 account fees',
+        ).to.be.bignumber.equal(
+            expectedERC20BalancesByOwner[signedOrderLeft.feeRecipientAddress][this._feeTokenAddress],
+        );
+        expect(
+            realERC20BalancesByOwner[signedOrderRight.feeRecipientAddress][this._feeTokenAddress],
+            'Checking right fee receipient ingress ERC20 account fees',
+        ).to.be.bignumber.equal(
+            expectedERC20BalancesByOwner[signedOrderRight.feeRecipientAddress][this._feeTokenAddress],
+        );
     }
     /// @dev Calculates the expected balances of order makers, fee recipients, and the taker,
     ///      as a result of matching two orders.
@@ -438,7 +567,9 @@ export class MatchOrderTester {
         // Taker Fees
         expectedNewERC20BalancesByOwner[takerAddress][this._feeTokenAddress] = expectedNewERC20BalancesByOwner[
             takerAddress
-        ][this._feeTokenAddress].minus(expectedTransferAmounts.feePaidByTakerLeft.add(expectedTransferAmounts.feePaidByTakerRight));
+        ][this._feeTokenAddress].minus(
+            expectedTransferAmounts.feePaidByTakerLeft.add(expectedTransferAmounts.feePaidByTakerRight),
+        );
         // Left Fee Recipient Fees
         expectedNewERC20BalancesByOwner[feeRecipientAddressLeft][
             this._feeTokenAddress
@@ -454,4 +585,4 @@ export class MatchOrderTester {
 
         return [expectedNewERC20BalancesByOwner, expectedNewERC721TokenIdsByOwner];
     }
-}
+} // tslint:disable-line:max-file-line-count
diff --git a/packages/contracts/test/utils/types.ts b/packages/contracts/test/utils/types.ts
index 481ee87d6..172622777 100644
--- a/packages/contracts/test/utils/types.ts
+++ b/packages/contracts/test/utils/types.ts
@@ -117,21 +117,21 @@ export interface TransferAmountsByMatchOrders {
     // Left Maker
     amountBoughtByLeftMaker: BigNumber;
     amountSoldByLeftMaker: BigNumber;
-    amountReceivedByLeftMaker: BigNumber;
+    //   amountReceivedByLeftMaker: BigNumber;
     feePaidByLeftMaker: BigNumber;
     // Right Maker
     amountBoughtByRightMaker: BigNumber;
     amountSoldByRightMaker: BigNumber;
-    amountReceivedByRightMaker: BigNumber;
+    // amountReceivedByRightMaker: BigNumber;
     feePaidByRightMaker: BigNumber;
     // Taker
     amountReceivedByTaker: BigNumber;
     feePaidByTakerLeft: BigNumber;
     feePaidByTakerRight: BigNumber;
-    totalFeePaidByTaker: BigNumber;
+    // totalFeePaidByTaker: BigNumber;
     // Fee Recipients
-    feeReceivedLeft: BigNumber;
-    feeReceivedRight: BigNumber;
+    //  feeReceivedLeft: BigNumber;
+    //  feeReceivedRight: BigNumber;
 }
 
 export interface OrderInfo {