From 09c0fc94fc91134acfdee1017d7a50e2047b019b Mon Sep 17 00:00:00 2001
From: Brandon Millman <brandon.millman@gmail.com>
Date: Thu, 2 Aug 2018 13:22:04 -0700
Subject: Implement first round of tests for
 findOrdersThatCoverMakerAssetFillAmount

---
 packages/order-utils/src/constants.ts    |  1 +
 packages/order-utils/src/index.ts        |  1 +
 packages/order-utils/src/market_utils.ts | 23 +++++++++++------------
 3 files changed, 13 insertions(+), 12 deletions(-)

(limited to 'packages/order-utils/src')

diff --git a/packages/order-utils/src/constants.ts b/packages/order-utils/src/constants.ts
index b18546a6c..5137ff499 100644
--- a/packages/order-utils/src/constants.ts
+++ b/packages/order-utils/src/constants.ts
@@ -2,6 +2,7 @@ import { BigNumber } from '@0xproject/utils';
 
 export const constants = {
     NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
+    NULL_BYTES: '0x',
     // tslint:disable-next-line:custom-no-magic-numbers
     UNLIMITED_ALLOWANCE_IN_BASE_UNITS: new BigNumber(2).pow(256).minus(1),
     TESTRPC_NETWORK_ID: 50,
diff --git a/packages/order-utils/src/index.ts b/packages/order-utils/src/index.ts
index 129eb0a3d..858f500c6 100644
--- a/packages/order-utils/src/index.ts
+++ b/packages/order-utils/src/index.ts
@@ -32,3 +32,4 @@ export { assetDataUtils } from './asset_data_utils';
 export { EIP712Utils } from './eip712_utils';
 export { OrderValidationUtils } from './order_validation_utils';
 export { ExchangeTransferSimulator } from './exchange_transfer_simulator';
+export { marketUtils } from './market_utils';
diff --git a/packages/order-utils/src/market_utils.ts b/packages/order-utils/src/market_utils.ts
index 4ddcc6ec8..710eddf8a 100644
--- a/packages/order-utils/src/market_utils.ts
+++ b/packages/order-utils/src/market_utils.ts
@@ -39,10 +39,17 @@ export const marketUtils = {
                     return { resultOrders, remainingFillAmount: constants.ZERO_AMOUNT };
                 } else {
                     const orderState = orderStates[index];
-                    const makerAssetAmountAvailable = getMakerAssetAmountAvailable(orderState);
+                    const makerAssetAmountAvailable = orderState.remainingFillableMakerAssetAmount;
+                    // if there is no makerAssetAmountAvailable do not append order to resultOrders
+                    // if we have exceeded the total amount we want to fill set remainingFillAmount to 0
                     return {
-                        resultOrders: _.concat(resultOrders, order),
-                        remainingFillAmount: remainingFillAmount.minus(makerAssetAmountAvailable),
+                        resultOrders: makerAssetAmountAvailable.gt(constants.ZERO_AMOUNT)
+                            ? _.concat(resultOrders, order)
+                            : resultOrders,
+                        remainingFillAmount: BigNumber.max(
+                            constants.ZERO_AMOUNT,
+                            remainingFillAmount.minus(makerAssetAmountAvailable),
+                        ),
                     };
                 }
             },
@@ -83,7 +90,7 @@ export const marketUtils = {
             signedOrders,
             (accFees, order, index) => {
                 const orderState = orderStates[index];
-                const makerAssetAmountAvailable = getMakerAssetAmountAvailable(orderState);
+                const makerAssetAmountAvailable = orderState.remainingFillableMakerAssetAmount;
                 const feeToFillMakerAssetAmountAvailable = makerAssetAmountAvailable
                     .div(order.makerAssetAmount)
                     .mul(order.takerFee);
@@ -99,11 +106,3 @@ export const marketUtils = {
         );
     },
 };
-
-const getMakerAssetAmountAvailable = (orderState: OrderRelevantState) => {
-    return BigNumber.min(
-        orderState.makerBalance,
-        orderState.remainingFillableMakerAssetAmount,
-        orderState.makerProxyAllowance,
-    );
-};
-- 
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