Fixed the bug and moved "contracts-tests" to "contracts-integrations"

contracts/exchange-libs/contracts/src/LibFillResults.sol

@@ -49,6 +49,51 @@ library LibFillResults {
         uint256 profitInRightMakerAsset; // Profit taken from the right maker
     }
 
+    event TestEvent(string file_name, string value_name, uint256 value);
+
+    /// FIXME: Remove this function after investigation
+    /// @dev Calculates amounts filled and fees paid by maker and taker.
+    /// @param order to be filled.
+    /// @param takerAssetFilledAmount Amount of takerAsset that will be filled.
+    /// @param protocolFeeMultiplier The current protocol fee of the exchange contract.
+    /// @param gasPrice The gasprice of the transaction. This is provided so that the function call can continue
+    ///        to be pure rather than view.
+    /// @return fillResults Amounts filled and fees paid by maker and taker.
+    function calculateFillResultsTrace(
+        LibOrder.Order memory order,
+        uint256 takerAssetFilledAmount,
+        uint256 protocolFeeMultiplier,
+        uint256 gasPrice,
+        bool shouldTrace
+    )
+        internal
+        pure
+        returns (FillResults memory fillResults)
+    {
+        // Compute proportional transfer amounts
+        fillResults.takerAssetFilledAmount = takerAssetFilledAmount;
+        fillResults.makerAssetFilledAmount = LibMath.safeGetPartialAmountFloor(
+            takerAssetFilledAmount,
+            order.takerAssetAmount,
+            order.makerAssetAmount
+        );
+        fillResults.makerFeePaid = LibMath.safeGetPartialAmountFloor(
+            takerAssetFilledAmount,
+            order.takerAssetAmount,
+            order.makerFee
+        );
+        fillResults.takerFeePaid = LibMath.safeGetPartialAmountFloor(
+            takerAssetFilledAmount,
+            order.takerAssetAmount,
+            order.takerFee
+        );
+
+        // Compute the protocol fee that should be paid for a single fill.
+        fillResults.protocolFeePaid = gasPrice.safeMul(protocolFeeMultiplier);
+
+        return fillResults;
+    }
+
     /// @dev Calculates amounts filled and fees paid by maker and taker.
     /// @param order to be filled.
     /// @param takerAssetFilledAmount Amount of takerAsset that will be filled.